[Q] [SOLVED] Is there kernel loop support for our device ? - LG Optimus L9 P760, P765, P768, P769

Hi,
As the title says, Is there Kernel loop support for our LG Optimus L9 ?
I'm trying to mount a loop file created on debian on the device, but I get the error
ioctl LOOP_SET_FD failed: Device or resource busy
Click to expand...
Click to collapse
.
This is what I did --
Loop file created on debian and formatted with ext4.
On Optimus L9 with CM10.1, in terminal emulator,
$su
#losetup /dev/block/loop0 /storage/sdcar1/file
#mount -o remount,rw /system
#mkdir /system/temp
#mount -rw -o loop -t ext4 /dev/block/loop0 /system/temp/
ioctl LOOP_SET_FD failed: Device or resource busy
#
Click to expand...
Click to collapse
Is our kernel having loop support. If yes, am I doing anything wrong? The file gets successfully mounted in Debian.
EDIT:
using "busybox mount" solved the issue.

Tried adding busybox to the mount command and voila it worked.
#busybox mount -rw -o loop -t ext4 /dev/block/loop0 /system/temp/
Click to expand...
Click to collapse

You just taught me something new, thanks.
Can you upload your img, I would really like to check this out, or can you direct me to a thread so I can learn some more.
Sent from my LGMS769 using xda app-developers app

kuma82 said:
You just taught me something new, thanks.
Can you upload your img, I would really like to check this out, or can you direct me to a thread so I can learn some more.
Sent from my LGMS769 using xda app-developers app
Click to expand...
Click to collapse
The one I created is over 100MB. I had a html tutorial containing 12,000 files. I don't want to put those files on sdcard and mess it up. So, I used this block device.
I have created a sample "temp.img" file with a size of 500KB. It contains a single text file. I'm attaching it and you can check it out.
Below is the way i created and mounted it.
Code:
# "temp.img" md5 b97642fed817fa3f1a0cc6dc64b6c40d
# remount rootfs rw.
mount -o remount,rw /
# create mount point.
mkdir /mnt/temp
# chmod mountpoint.
chmod 777 /mnt/temp
# create block file.
dd if=/dev/zero of=/storage/sdcard0/temp.img bs=1024 count=500
# this creates 500 KB file. I can't seem
# to get bs=1M argument working on android.
# so bs1024 x count = target file size (=count times in KB).
# query free loop device. (will be /dev/block/loopx)
losetup -f
#attach block file with free loop.
losetup /dev/block/loop0 /storage/sdcard0/temp.img
#create file system.
mke2fs -T ext2 /dev/block/loop0
# And finally mount it
busybox mount -o loop -t ext2 -rw /dev/block/loop0 /mnt/temp
# For unmounting
busybox umount /mnt/temp
And it isn't encrypted. I don't need encryption, and i can't even seem to figure out how to encrypt it.

Related

Debian on the X10

[MESSAGE TO MODS, I could not include urls so have added spaces to pass spam filter.. please change?]
Well now we finally have root on our shiny devices I decided to crack open
the beers and get to work getting debian running on the X10..
the process is actually pretty straight-forward.
(as it turns out the x10's kernel already has support for most things needed
such as the ext2 filesystem)
-- step 1--
firstly we need to create a debian image for the phone, there are a few already out there but you can use the following to create your own
Code:
apt-get install debootstrap
dd if=/dev/zero of=debian.img seek=749999999 bs=1 count=1
mke2fs -F debian.img
mkdir debian
mount -o loop debian.img debian
debootstrap --verbose --arch armel --foreign lenny debian [ht]tp:[//]ftp. de. debian. org/debian
umount debian
how ever if you would prefer to use a ready built one (recomended for less techies ) you can get one from: rapidshare. com/files/161776007/debian-armel-750.img.bz2
(had to include spaces in the url to pass spam filter, could a mod please change this?)
now copy this too the root of your sdcard and make sure its called debian.img
-- step 2 --
I have created a script to do most of the other work for you:
Code:
alias b=busybox
export PATH=/data/local/bin:/usr/bin:/usr/sbin:/bin:$PATH
b mknod /dev/loop0 b 7 0
b mount -o loop,noatime /sdcard/debian.img /data/local/mnt
echo 'nameserver 4.2.2.2' >data/local/mnt/etc/resolv.conf
b chroot /data/local/mnt
mount -t devpts devpts /dev/pts
mount -t proc proc /proc
mount -t sysfs sysfs /sys
rm -f /etc/mtab
ln -s /proc/mounts /etc/mtab
put this in your sdcard to.
-- step 3 --
Finally in any terminal emulator cd to the location of the startdeb.sh file
and do the following:
Code:
chmod 777 ./startdeb.sh
./startdeb.sh
!! and your done !!
you should now be within the debian system.. i suggest running
Code:
apt-get update
and installing what ever apps you want
(my first choices were gcc, python and tightvncserver)
[ EXTRA ]
now your on debian you can use
Code:
apt-get install tightvncserver
to get the xwindow system and the vnc server
now set both your HOME and USER variables
Code:
export HOME=/root
export USER=root
(or what ever user you choose)
and run
Code:
tightvncserver
(your also gonna have to download lxde and do a few other bits of setup
have a look around for X11 "Ported" to android post on these forums)
you could also change the config so that the desktop is displayed
at the right size for the screen
just use a vnc client from the market to connect to your GUI
Kool. I had ubuntu running on my htc touch pro once but wasnt really worth having apart from the cool factor. This looks promising.............. ill wait a while till I play around, the rooting factor is still new and I dont see the major gain to root yet.
Way awesome, thanks for the guide.
Nice work, will give this a try after I get the R2B rooted on my phone.
Next step for me would be to get the arm cross compilation toolchain and start porting goodies for the android....
wow this looks sooooo awesome!! any screen shots? don't make me google
when i try mounting debian.img using ur cmd i got following error
Code:
Usage: mount [-r] [-w] [-o options] [-t type] device directory
seems my mount requires -t parameters, so i try again, but still having error
Code:
mount -o loop,noatime -t ext2 /sdcard/debian.img /data/local/mnt
ioctl LOOP_SET_FD failed: Device or resource busy
please help thanks!
aget1 said:
when i try mounting debian.img using ur cmd i got following error
Code:
Usage: mount [-r] [-w] [-o options] [-t type] device directory
seems my mount requires -t parameters, so i try again, but still having error
Code:
mount -o loop,noatime -t ext2 /sdcard/debian.img /data/local/mnt
ioctl LOOP_SET_FD failed: Device or resource busy
please help thanks!
Click to expand...
Click to collapse
Are you running the script as root? If you not you might wanna try that.
This may sound kind of noobish, but would this be a dual-boot (I.e. running both android and debian on different boots of the phone, or would this be debian, until you reset the phone to be android again.
Sent from my X10a using XDA App
ddewbofh said:
Are you running the script as root? If you not you might wanna try that.
Click to expand...
Click to collapse
Still the same
Code:
whoami
whoami: unknown uid 0
mount -o loop,noatime -t ext2 /sdcard/debian.img /data/local/mnt
ioctl LOOP_SET_FD failed: Device or resource busy
aget1 said:
Still the same
Code:
whoami
whoami: unknown uid 0
mount -o loop,noatime -t ext2 /sdcard/debian.img /data/local/mnt
ioctl LOOP_SET_FD failed: Device or resource busy
Click to expand...
Click to collapse
And I assume you're either running the script or doing those commands manually? Including the mknod part?
ddewbofh said:
And I assume you're either running the script or doing those commands manually? Including the mknod part?
Click to expand...
Click to collapse
i run the script and found no luck, so i type in both adb and console, of coz mknod is done, either mkdir /data/local/mnt is done or not gives the same result, tried also mounting without loop,noatime and gives
Code:
mount: Block device required
would it be rooting problem or mount problem?
also tried losetup -d /dev/loop0, no luck
Code:
losetup: /dev/loop0: Device or resource busy
Keegan_P said:
This may sound kind of noobish, but would this be a dual-boot (I.e. running both android and debian on different boots of the phone, or would this be debian, until you reset the phone to be android again.
Sent from my X10a using XDA App
Click to expand...
Click to collapse
i see this to be a remounting of debian system on your phone, no modification on your phone so no, no dual boot
anybody can post a video tutorial please?
and the debian and android works together or just debian?
thx
A video tutorial would be amazing.
Sent from my X10a using XDA App
I will upload a video tutorial asap but at the moment I am having to use a 3G dongle for my internet (just moved out, am poor.. all donations to [email protected] on paypal ;-)) also this runs along side (or on top of) android so you'll still be able to get your texts and calls.. finally there are already a lot of debian apps compiled for ARM systems so have a look to see if the app you want is on apt (make sure you've run apt-get update first) please pm me if you have any problems
Thanks,
Sam Aldis
I tried to run it on the latest firmware and it seems loop device kernel module is not available in it.
Also the script is not fully functional :
you need to 'mkdir /data/local/mnt/'
also it's '/data/local' instead of 'data/local'
I haven't spend much time on this, so it's not working for now on my phone.
So help is welcome
Quick question:
Has anyone at all gotten this to work?
nope. I doubt it.
mod edit:..
sorry for stupid me, i don't know i can create loop device more than loop 0
i create loop0,loop1,loop2,loop7 and try mounting again, it success this time
so here is my script:
Code:
#!/system/bin/bash
export PATH=/data/local/bin:/usr/bin:/usr/sbin:/bin:$PATH
if [ ! -d /data/local/mnt ]
then
mkdir /data/local/mnt
fi
if [ ! -b /dev/loop2 ]
then
mknod /dev/loop0 b 7 0
mknod /dev/loop1 b 7 0
mknod /dev/loop2 b 7 0
mknod /dev/loop7 b 7 0
fi
if [ ! -d /data/local/mnt/bin ]
then
mount -o loop,noatime /sdcard/debian.img /data/local/mnt
fi
echo "nameserver 4.2.2.2" >data/local/mnt/etc/resolv.conf
chroot /data/local/mnt
mount -t devpts devpts /dev/pts
mount -t proc proc /proc
mount -t sysfs sysfs /sys
rm -f /etc/mtab
ln -s /proc/mounts /etc/mtab
Edited:
I just brick my device after some more work, every command even ls do no output, reboot machine freezes at sony ericsson logo, now i am re rooting the device......
Edited 2:
Should be not the problem of debian, seems working fine.

[W-I-P][DEVELOPMENT] Dual / Multi Boot Project: Devs Only

{ LONG POST WARNING }
{ NOT FULLY WORKING YET}
{ NEEDS A LOT OF FURTHER DEVELOPMENT }
Hey everyone I had thought of making this Dual Booting system work along side recovery… because initially (with FreeX10-alpha) it was not possible to have both recovery & dual boot...
Thank you zdzihu & jerpelea for your great work on FreeX10-alpha, which booted off SDCARD… I got inspiration to try and make this work for FreeX10-beta4 based on the amazing work that u guys did! Thank you jerpelea for all your feedback on my repeated messages when I was testing this a few months back (hope I didn’t bother u too much with questions )...
zdzihu & jerpelea u are truly LEGENDS!!!
[This is just my personal opinion] Really hoping that some devs can take interest in this to provide compatible files (ramdisks, system files) for this to work… may be as an add-on to their main roms… please don’t keep bothering devs to create ramdisks for booting off SDCARD… they are already very busy trying to make our X10 better with faster and stable ROMS/MODS/etc… this is just an additional feature…
The basic idea was to use the chargemon booting scripts provided in FreeX10-alpha and to try and make FreeX10-beta4 to boot off SDCARD…
Initially I used the img files which came with FreeX10-alpha and wiped the image to then put FreeX10-beta4 on it… while doing so I realized that all of the symbolic links were not getting copied correctly (obviously)… so I started from scratch with blank ext2fs images…
Later I thought of using clean/base nandroid/recovery backups as they are already working/preconfigured system of FreeX10-beta4…
Following is a small How-To on converting NANDROID/RECOVERY images (with yaffs fs) to ext2 fs images keeping the symlinks intact!!
I have used Ubuntu for these steps.
I have attached blank_files.7z which contains precompiled ext2fs images:
system.img [size: 256 MB]
data.img [size: 512 MB]
cache.img [size: 128 MB]
To resize or create newer ext2fs images:
[APP] Windows: Create Your Own Data.img Maker Application, +/- From Existing data.img
U can use the commands provided there even in linux to create/resize these images...
We will keep the NANDROID images at:
Code:
/home/user/nandroid_imgs/test1/
and EXT2 FS images at:
Code:
/home/user/ext2fs_imgs/test1/
while temporary mounts points will be made at:
Code:
/home/user/mntpts/
We will be using unyaffs from here:
[How-To] Extracting/Accessing Recovery/Nandroid backup (.img) files
Extracting files from the nandroid/recovery backups:
Code:
cd /home/user/nandroid_imgs/test1
mv system.img /home/user/nandroid_imgs/test1/system/
cd /home/user/nandroid_imgs/test1/system/
sudo unyaffs system.img
mv system.img ../.
mv data.img /home/user/nandroid_imgs/test1/data/.
cd /home/user/nandroid_imgs/test1/data/
sudo unyaffs data.img
mv data.img ../.
mv cache.img /home/user/nandroid_imgs/test1/cache/
cd /home/user/nandroid_imgs/test1/cache/
sudo unyaffs cache.img
mv cache.img ../.
Loop mounting ext2 fs files:
Code:
sudo mount -t ext2 -o loop,rw,noatime,nodiratime /home/user/ext2fs_imgs/test1/system.img /home/user/mntpts/system/
sudo mount -t ext2 -o loop,rw,noatime,nodiratime,nosuid,nodev /home/user/ext2fs_imgs/test1/data.img /home/user/mntpts/data/
sudo mount -t ext2 -o loop,rw,noatime,nodiratime,nosuid,nodev /home/user/ext2fs_imgs/test1/cache.img /home/user/mntpts/cache/
Recursively copy all files (preserving symlinks) from extracted yaffs images to mount points
Code:
sudo cp -r -p /home/user/nandroid_imgs/test1/system/* /home/user/mntpts/system/.
sudo cp -r -p /home/user/nandroid_imgs/test1/data/* /home/user/mntpts/data/.
sudo cp -r -p /home/user/nandroid_imgs/test1/cache/* /home/user/mntpts/cache/.
Unmount the mounts:
Code:
sudo umount /home/user/mntpts/system/
sudo umount /home/user/mntpts/data/
sudo umount /home/user/mntpts/cache/
Ok now that the ext2fs iamges are populated with working files copy them onto SDCARD…
I have placed it at:
Code:
/sdcard/FreeX10
lets move on to the chargemon script...
This is, as of now, based off xRecovery chargemon (modified from FreeX10-alpha)
Code:
#!/system/bin/busybox sh
# modified chargemon for recovery + dual boot from NAND/SDCARD
/system/bin/charger
cat /dev/input/event2 > /dev/keycheck&
sleep 3
kill -9 $!
# intact recovery
if [ -s /dev/keycheck ]
then
# remount rootfs rw
mount -o remount,rw rootfs /
# Umount MTDs
umount -l /data
umount -l /cache
# Extract recovery
cd /
rm -r /sbin
rm -f etc
tar -xf /system/bin/xrecovery.tar
# Umount system
umount -l /system
chroot / /init
fi
echo "check if reboot into SDCARD OS was called"
if [ -e /data/local/tmp/rebootsdcardos ]
then
echo "Booting from SDCARD!"
# FreeX10-alpha code follows with slight modifications!!!
# remount rootfs rw
mount -o remount,rw rootfs /
busybox chmod 0777 /dev -R
busybox chown 0.2000 /dev/oncrpc -R
rm -r /sdcard
cd /
mkdir sd
chmod 777 sd
rm init*
rm logo.rle
rm default.prop
tar -xf /system/bin/sdcardos_ramdisk.tar
# Umount system,data,cache
umount -l /system
umount -l /data
umount -l /cache
# Check and mount SD Card
dosfsck -y /dev/block/mmcblk0p1
sleep 5
mount -t vfat -o rw,noatime,nodiratime /dev/block/mmcblk0p1 /sd
sleep 5
# Mount system and data ext2 images
losetup /dev/block/loop1 /sd/FreeX10/system.img
sleep 5
losetup /dev/block/loop2 /sd/FreeX10/data.img
sleep 5
losetup /dev/block/loop3 /sd/FreeX10/cache.img
sleep 5
e2fsck -y /dev/block/loop1
e2fsck -y /dev/block/loop2
e2fsck -y /dev/block/loop3
mount -t ext2 -o rw,noatime,nodiratime /dev/block/loop1 /system
sleep 5
mount -t ext2 -o rw,noatime,nodiratime,nosuid,nodev /dev/block/loop2 /data
sleep 5
mount -t ext2 -o rw,noatime,nodiratime,nosuid,nodev /dev/block/loop3 /cache
sleep 5
# zdzihu: hack-fix
if [ -e /data/data/com.android.providers.telephony/databases/telephony.db ]; then
/system/bin/chroot / /init
exit
fi
# Chroot :)
chroot / /init
# jump out of chargemon to skip NAND booting
exit
fi
echo "Booting from NAND!"
# remount rw
mount -o remount,rw rootfs /
cd /
rm -r /sdcard
rm init*
rm logo.rle
rm default.prop
tar -xf /system/bin/ramdisk.tar
# zdzihu: hack-fix
if [ -e /data/data/com.android.providers.telephony/databases/telephony.db ]; then
/system/bin/chroot / /init
exit
fi
chroot / /init
Recovery is intact so u can get into recovery the normal way… (press/tap back key after seeing SE text logo)
OS on NAND (normal system on MTD) will boot by default…
To reboot into OS on SDCARD issue the following commands in terminal emulator/adb shell:
Code:
touch /data/local/tmp/rebootsdcardos
reboot
NOW the OS should start booting off the SDCARD…
It completes commands in chargemon and then BootAnimation can be seen…
BUT HERE IS THE PROBLEM!
Check LOGCAT here: http://www.mediafire.com/?phxm3uqzp0dzzhb
here is wht J had to say:
jerpelea said:
as you can see in logcat
1.your prelink is not ok
2.you don't have something ok in initrd
3.you dont have all permisions ok on data
Click to expand...
Click to collapse
From my limited understanding we yet have to make a proper ramdisk (sdcardos_ramdisk.tar)… I feel the init.rc file has to be changed especially the following line (based off FreeX10-beta4 ramdisk):
Code:
mount yaffs2 [email protected] /system rw remount
mount yaffs2 [email protected] /data nosuid nodev
mount yaffs2 [email protected] /cache nosuid nodev
As for Multi-Booting:
We can keep adding different sections to chargmeon:
Code:
/data/local/tmp/rebootsdcardos1
/data/local/tmp/rebootsdcardos2
etc…
OR
possible solution for having both recovery and dual boot
and similarly keep adding ramdisks in NAND /system:
Code:
sdcardos1_ramdisk.tar
sdcardos2_ramdisk.tar
etc
So we can have as many OS/ROMs on SDCARD as u have free space… though we need to make specific ramdisks for each…
Hope this was slightly useful… and waiting for feedback from advance users on how we can get this working....
Lol, you're working very hard Doom! Keep going!
Doom! You are making enormous progress and helping a lot with Other Devs.
A Combination of a good rom and one of these additional Dual Boot would make x10 better than any Android mobile SE could deliver.
Thank you and I really pray to give SE a run for their money!
for someone thats always saying hes not a developer you sure as hell seem to know what your doing!
Keep up the great work, i hope to see this working flawlessly that would be awesome to be able to dual boot.
Whats the next steps in the project?
BULL3TPR00F said:
for someone thats always saying hes not a developer you sure as hell seem to know what your doing!
Keep up the great work, i hope to see this working flawlessly that would be awesome to be able to dual boot.
Whats the next steps in the project?
Click to expand...
Click to collapse
well i am not exactly a ROM developer and dont know much about how to compile libs/sources/etc...
next step is that we need to make compatible system files & ramdisk (init.rc) for dual booting
DooMLoRD said:
well i am not exactly a ROM developer and dont know much about how to compile libs/sources/etc...
next step is that we need to make compatible system files & ramdisk (init.rc) for dual booting
Click to expand...
Click to collapse
You may not be a rom developer but your an amazing commited x10 modder
Sent from my X10i TripNMiUI using XDA App
DooMLoRD said:
well i am not exactly a ROM developer and dont know much about how to compile libs/sources/etc...
next step is that we need to make compatible system files & ramdisk (init.rc) for dual booting
Click to expand...
Click to collapse
I am also excited buddy..... Once i get through my experiments i will surely like to focus on this as this will allow us to have more then one version of ROM on one machine.
Based on your first post
all i can get is we are getting the boot animation but not going after that.
i would suggest following things based on my experiments with ubuntu work.
use loops above 10 coz i suspect some loops are already in use during my ubuntu boot i am watching that loop7 is already created so i would suggest avoiding it.
also as we have been adding debug "we have reached here" style code can we do the same here that might help us.
also can we find any debug-able place i mean place where we can track the progress to get the position inside the rom so that we can understand except logcat where we are.
any progress or hurdles buddy.....
i am eager to test this .....
anantshri said:
any progress or hurdles buddy.....
i am eager to test this .....
Click to expand...
Click to collapse
sorry man havent had time to do any further testing for this... have been very busy with some personal work and kernel manager scripts...
DooMLoRD said:
sorry man havent had time to do any further testing for this... have been very busy with some personal work and kernel manager scripts...
Click to expand...
Click to collapse
Keep up the good Work Doom. ! and thx for your work
Sorry if its no help but there's a thread in the x10 mini pro section
http://forum.xda-developers.com/showthread.php?t=1084555
Sent from my SEX10 using XDA App
These are great news, keep on developing!
sent from my x10i with wolfbreaks CM 6.1.3 v006 undervolted, bb67
rtblittlebrown said:
Sorry if its no help but there's a thread in the x10 mini pro section
http://forum.xda-developers.com/showthread.php?t=1084555
Sent from my SEX10 using XDA App
Click to expand...
Click to collapse
they have posted exactly the same thing!
read my 1st post in this thread and then read the first few posts there
Ohk so since we now have one more option in Xrecovery i am back to my old suggestion.
however this time i will post my thought out in open so that if someone has required skills and time then they can work on .
I have an idea of using xrecovery as a boot menu.
process would be
1) Xrecovery to start everytime. (this needs some consideration.)
2) To have a timeout value if any key pressed before that then remain in menu otherwise boot to the os.
3) inside menu we should have options of all O.S. / ROM (os coz my intention are to run linux off dualboot) available with selection options.
4) ON selection it will just be the same procedure as already using in xrecovery 1.0 to handover the command to a script. and let it load.
5) boot menu if possible could be controlled by an outside file which we can edit just like grub.conf in linux.
Note : This will requires good understanding of booting process of X10i and c skills as xrecovery is written in complete c.
anantshri said:
Ohk so since we now have one more option in Xrecovery i am back to my old suggestion.
however this time i will post my thought out in open so that if someone has required skills and time then they can work on .
I have an idea of using xrecovery as a boot menu.
process would be
1) Xrecovery to start everytime. (this needs some consideration.)
2) To have a timeout value if any key pressed before that then remain in menu otherwise boot to the os.
3) inside menu we should have options of all O.S. / ROM (os coz my intention are to run linux off dualboot) available with selection options.
4) ON selection it will just be the same procedure as already using in xrecovery 1.0 to handover the command to a script. and let it load.
5) boot menu if possible could be controlled by an outside file which we can edit just like grub.conf in linux.
Note : This will requires good understanding of booting process of X10i and c skills as xrecovery is written in complete c.
Click to expand...
Click to collapse
point no.1 is easy... not an issue..
abt point 2 i think that too would be possible... a while loop with sleep function & wait for input/keppress
pt3 the newer xrecovery v1.0.0 already has something similar may be we can look into it to add "Boot NAND system" as first option
point no. 5 if possible WILL BE BRILLIANT!!!
@anantshri
dude may be these guys can help us:
http://forum.xda-developers.com/showpost.php?p=14354231&postcount=49
DooMLoRD said:
they have posted exactly the same thing!
read my 1st post in this thread and then read the first few posts there
Click to expand...
Click to collapse
Oops sorry..
Sent from my SEX10 using XDA App
rtblittlebrown said:
Oops sorry..
Sent from my SEX10 using XDA App
Click to expand...
Click to collapse
no dude thanks for the info... i have already contacted those guys for help... lets see may be they can help us out to get this working!!!
dual boot hint by Z
http://forum.xda-developers.com/showthread.php?t=1107111
something related

[Q] To devs... How to extract System.img

Hi guys..
Sorry If I'm posting this in the wrong section...
But can anyone guide me how to extract System.img from a Stock ROM as I'm planning to cook a custom ROM
If you would like to see some of my previous work for SGS1 look at my signature
You can try unyaffs in a cygwin environment or wunyaffs which is for windows.
For some reason I get access violation errors with stock roms for the Tab.
With HTC roms it was possible to dump the system.img with magiciso. Again with Tab roms this no longer works.
In CWM, after mounting /system:
make_ext4fs -l 568m -s /sdcard/system.img /system
This gives you a sparse system.img which you can turn into a Linux-mountable ext4 image with simg2img
Sorry i writed on wrong thread
In Linux you can do
mkdir tmp
sudo mount -o loop -t ext4 system.img ./tmp && cp -r ./tmp/* ./system/
sudo umount ./tmp
Sent from my Samsung Galaxy Tab 10.1 using Tapatalk
jamezelle said:
In Linux you can do
mkdir tmp
sudo mount -o loop -t ext4 system.img ./tmp && cp -r ./tmp/* ./system/
sudo umount ./tmp
Sent from my Samsung Galaxy Tab 10.1 using Tapatalk
Click to expand...
Click to collapse
I'm getting an error
Code:
sudo mount -o loop -t ext4 system.img ./tmp && cp -r ./tmp/* ./system
mount: wrong fs type, bad option, bad superblock on /dev/loop0,
missing codepage or helper program, or other error
In some cases useful info is found in syslog - try
dmesg | tail or so
Nokia7Vista said:
I'm getting an error
Code:
sudo mount -o loop -t ext4 system.img ./tmp && cp -r ./tmp/* ./system
mount: wrong fs type, bad option, bad superblock on /dev/loop0,
missing codepage or helper program, or other error
In some cases useful info is found in syslog - try
dmesg | tail or so
Click to expand...
Click to collapse
See the message I posted up above? You have to run the system.img through simg2img to make it mountable.
Sent from my Samsung Galaxy Tab 10.1
mabalito said:
See the message I posted up above? You have to run the system.img through simg2img to make it mountable.
Sent from my Samsung Galaxy Tab 10.1
Click to expand...
Click to collapse
oh ok,, Thanks
Nokia7Vista said:
oh ok,, Thanks
Click to expand...
Click to collapse
Hope this helps and welcome to the GT10.1 forum
Sent from my Samsung Galaxy Tab 10.1
You could always create a regular (non-sparse) image file using dd then mount it.
Command should be similar to ****, though I'm not sure if the busybox version of dd accepts bs=1M, it may require bs=1048576. (That's MB converted to B) And count is the number of MB you want the image to be.
Code:
dd if=/dev/zero of=squeeze.img bs=1M count=512
Then mount it like this:
Code:
mount -o loop,noatime -t ext4 /sdcard/debian/squeeze.img /data/local/debian/
*Pulled from a thread I wrote awhile back, you may be able to get away without using the "noatime" option.

[Q] SDCard Script

Can someone post the script that mount sdcard at boot?
I created a kernel but it doesn't mount sdcard at boot, it's possibile to create the script in system/etc/init.d that mount sdcard at boot?
Try busybox mount while booted to see if it's possible to mount SD Card with a script. SD card mounts automatically if it's FAT32 and it takes a little vold.fstab configuration for other file systems. You should check franco's or LG's kernel to see how to automount sd card from kernel.
This is taken from CM7, put it in init.d and see.
Turducken said:
This is taken from CM7, put it in init.d and see.
Click to expand...
Click to collapse
Thank you very much but what's that?
# set property with exit code in case an error occurs
setprop cm.e2fsck.errors $e2fsk_exitcode;
if [ "$e2fsk_exitcode" -lt 2 ];
then
# mount and set perms
$BB mount -o noatime,nodiratime,barrier=1 -t ext3 $SD_EXT_PART $SD_EXT_DIRECTORY;
if [ "$?" = 0 ];
then
$BB chown 1000:1000 $SD_EXT_DIRECTORY;
$BB chmod 771 $SD_EXT_DIRECTORY;
log -p i -t mountsd "$SD_EXT_DIRECTORY successfully mounted";
else
log -p e -t mountsd "Unable to mount filesystem for $SD_EXT_DIRECTORY!";
fi
else
log -p e -t mountsd "Unable to repair filesystem, disabling apps2sd";
fi
Click to expand...
Click to collapse
EDIT: Mount This script sdcard?
#!/system/bin/sh
mount -o remount,ro -t yaffs2 /dev/block/mmcblk0
Click to expand...
Click to collapse
RE-EDIT: The CM7 script doesn't works, in the second reboot the sd wasn't mount
The CM7 script mounts a2sd apps (apps2sd script). The second one should be like
Code:
mount -o remount,r[b]w[/b] -t [b]fat32[/b] /dev/block/mmcblk0
. As I already said, it's probably a kernel problem, vold mounts sdcards automatically.
Cricco said:
Thank you very much but what's that?
Click to expand...
Click to collapse
That part of the script mounts an ext partition if one exists.
RE-EDIT: The CM7 script doesn't works, in the second reboot the sd wasn't mount
Click to expand...
Click to collapse
As Ianis G. Vasilev said there are various ways to mount the SD card but I suspect the issue is with the kernel you've compiled. Flash francos, if it mounts then your kernel is bad. Run logcat to see what's going on.
**EDIT**
I didn't see Ianis post before I began mine...
so with
mount -o remount,rw -t fat32 /dev/block/mmcblk0
Click to expand...
Click to collapse
the sd will be mount?
EDIT: I need a script that mount sd without write or read permission, infact if i use root explorer and I go to sdcard sometimes the sdcard folder is blank, so the sd didn't mount
Read permissions are needed to see what's on the sd card. For a read-only mount replace rw with ro:
Code:
mount -o remount,r[b]o[/b] -t fat32 /dev/block/mmcblk0
I would advice you to use dmesg(should be enabled in kernel) to see if your phone detects the card and logcat to see if any errors are preventing your card from mounting.
Now i create script
#!/system/bin/sh
mount -o remount,rw -t fat32 /dev/block/mmcblk0
mount -t vfat -o /dev/block/mmcblk0
Click to expand...
Click to collapse
is it correct?

Android 9 (Pie) unable to unlock /system from read-only mode

Hi all,
Just upgraded my Mi8 with the new Miui 10 based on Android P.
I've TWRP-3.2.3-0918 as recovery and rooted with Magisk-v17.1
As root, in the same condition until the previous version (Android Oreo) i was able to remount the /system with
# mount -o rw,remount /system
but in this version i get an error
'/dev/block/platform/soc/1d84000.ufshc/by-name/system' is read-only
i've tried many ways but nothing ... i'm unable to remount the /system for writing ... see below my failed attempts
# l /dev/block/platform/soc/1d84000.ufshc/by-name/system
lrwxrwxrwx 1 root root 16 Jun 4 1970 /dev/block/platform/soc/1d84000.ufshc/by-name/system -> /dev/block/sde48
# l /dev/block/sde48
brw------- 1 root root 259, 38 Jun 4 1970 /dev/block/sde48
# mount -o rw,remount /dev/block/sde48 /system
mount: '/system' not in /proc/mounts
# mount -o rw,remount /dev/block/platform/soc/1d84000.ufshc/by-name/system /system
'/dev/block/platform/soc/1d84000.ufshc/by-name/system' is read-only
home # mkdir mio
home # mount -t ext4 /dev/block/platform/soc/1d84000.ufshc/by-name/system mio
mount: '/dev/block/platform/soc/1d84000.ufshc/by-name/system'->'mio': Device or resource busy
# mount -o remount,rw,bind /system /data/data/berserker.android.apps.sshdroid/home/mio <
mount: '/data/data/berserker.android.apps.sshdroid/home/mio' not in /proc/mounts
home # cat /proc/mounts | grep system
/dev/block/platform/soc/1d84000.ufshc/by-name/system /system ext4 ro,seclabel,relatime,discard,data=ordered 0 0
/dev/block/platform/soc/1d84000.ufshc/by-name/system /sbin/.core/mirror/system ext4 ro,seclabel,relatime,discard,data=ordered 0 0
home # mount -o remount,rw,bind /dev/block/platform/soc/1d84000.ufshc/by-name/system /data/data/berserker.android.apps.sshdroid/home/mio
mount: '/data/data/berserker.android.apps.sshdroid/home/mio' not in /proc/mounts
home # mount -o remount,rw,bind /dev/block/platform/soc/1d84000.ufshc/by-name/system /system
'/dev/block/platform/soc/1d84000.ufshc/by-name/system' is read-only
home # mount -o remount,rw /dev/block/platform/soc/1d84000.ufshc/by-name/system /system
'/dev/block/platform/soc/1d84000.ufshc/by-name/system' is read-only
home # getenforce
Enforcing
home # setenforce 0
home # getenforce
Permissive
home # mount -o remount,rw /dev/block/platform/soc/1d84000.ufshc/by-name/system /system <
'/dev/block/platform/soc/1d84000.ufshc/by-name/system' is read-only
i'm out of idea
Someone have some try to suggest ?
Thank you
*Bump*
i'm the only one that is trying to mount RW the /system on Pie ?
adb root
adb disable-verity
adb reboot
adb root
adb remount
doesn't work for me , disable-verity not found
poloolop said:
adb root
adb disable-verity
adb reboot
adb root
adb remount
Click to expand...
Click to collapse
Hi poloolop,
i thank you for the try but ...
1) i have already the dm-verity disabled
2) i need to remount the /system from the shell command line inside the smartphone and not from the adb connected from a pc
hope that someone can solve this question ...
Thorezz said:
Hi poloolop,
i thank you for the try but ...
1) i have already the dm-verity disabled
2) i need to remount the /system from the shell command line inside the smartphone and not from the adb connected from a pc
hope that someone can solve this question ...
Click to expand...
Click to collapse
Hi Thorezz,
I had the same problem with my Mi8 on Android Pie. Flashing recovery twrp-3.2.3-0908.img sloved this problem. Warn you, i had the first start of recovery in Chinese.
Hi Rallbomban,
rallbomban said:
Hi Thorezz,
I had the same problem with my Mi8 on Android Pie. Flashing recovery twrp-3.2.3-0908.img sloved this problem. Warn you, i had the first start of recovery in Chinese.
Click to expand...
Click to collapse
thanks for trying but ... i've the problem with the twrp-3.2.3-0918 so it's a twrp newer than yours ... i also I noticed that the adway apk is able to mount and change the hosts file using some function of magisk (that i already have in my rooted system) so it's possibile to do but i'm unable to find how to do !
waiting for someone that have this knowledge
I had problem with newer recovery and only flashing older recovery solve it. But in my situation even Adaway couldn't change hosts file.
mount -o rw,remount /
mount -o rw,remount /dev/root
all geany is simply
No sry that doesn't work.. You have to flash the dm-verity-zip
Hi A.S._id
A.S._id said:
mount -o rw,remount /
mount -o rw,remount /dev/root
Click to expand...
Click to collapse
for sure you haven't read my question ...
1) the /etc it's in the system partiontion
2) on the n failed try that i've done (and that you can read on top of the thread) there is also "mount -o rw,remount /system" exactly as your answer ... and this don't work
anyway thank you for the try
Hi LUKI508,
LUKI508 said:
No sry that doesn't work.. You have to flash the dm-verity-zip
Click to expand...
Click to collapse
in my magisk manager the flag "keep AVB 2.0/dm-verity" is unchecked ... it'snt the same ?
Thank you
Thorezz said:
Hi A.S._id
for sure you haven't read my question ...
1) the /etc it's in the system partiontion
2) on the n failed try that i've done (and that you can read on top of the thread) there is also "mount -o rw,remount /system" exactly as your answer ... and this don't work
anyway thank you for the try
Click to expand...
Click to collapse
for sure you haven't read my answer
mount point of system in android 9 Pie now in root, so mount must have isn't /system, but root "/"...
And I'm tried it in my tv box x96 max android 9 Pie...
Hi A.S._id,
A.S._id said:
for sure you haven't read my answer
mount point of system in android 9 Pie now in root, so mount must have isn't /system, but root "/"...
And I'm tried it in my tv box x96 max android 9 Pie...
Click to expand...
Click to collapse
Doh ...
At first i thinking that you was joking ... i have done an ssh connection to my MI8 and i checked if the things are as you write and ... not ... i can confirm that the /etc is a symlink to /system/etc and /system is an autonomous mount point as you can see below
Code:
:/ # l -d /etc
lrwxrwxrwx 1 root root 11 Jan 1 1970 /etc -> /system/etc
1|:/ # mount | grep system
/dev/block/sde48 on /system type ext4 (ro,seclabel,relatime,discard,data=ordered)
so this confirm what i told you (and you can see that this is mounted RO) but ... i've done a try and ....
Code:
:/ # mount -o rw,remount /
no errors !
but if i try to create a file in /etc
HTML:
:/etc # touch thorezz
touch: thorezz: Read-only file system
1|:/etc # >thorezz
/system/bin/sh: can't create thorezz: Read-only file system
so the remount of / work but the /etc that it's in the /system don't become RW
and i can confirm that your suggestion don't work ...
thank you
P.S: all this with user root and /etc in writable by root ... just in case you think about this
Code:
:/etc # l -d .
drwxr-xr-x 27 root root 4096 Mar 21 14:38 .
@Thorezz
console:/ # mount -o rw,remount /
[ [email protected]] EXT4-fs (mmcblk0p18): re-mounted. Opts: block_validity,delalloc,barrier,user_xattr,acl
console:/ # mount -o rw,remount /dev/root
[ [email protected]] EXT4-fs (mmcblk0p18): re-mounted. Opts: block_validity,delalloc,barrier,user_xattr,acl
ps. your fstab
that has into /system/vendor/etc/fstab.qcom and etc has into /system/vendor/ too :yes:
and i think for you mount must have
Code:
[B]mount -o rw,remount /vendor[/B]
A.S._id said:
@Thorezz
console:/ # mount -o rw,remount /
[ [email protected]] EXT4-fs (mmcblk0p18): re-mounted. Opts: block_validity,delalloc,barrier,user_xattr,acl
Click to expand...
Click to collapse
this work but don't solve the problem
console:/ # mount -o rw,remount /dev/root
[ [email protected]] EXT4-fs (mmcblk0p18): re-mounted. Opts: block_validity,delalloc,barrier,user_xattr,acl
Click to expand...
Click to collapse
this don't work because in my phone does not exist /dev/root
ps. your fstab
that has into /system/vendor/etc/fstab.qcom and etc has into /system/vendor/ too :yes:
and i think for you mount must have
Code:
[B]mount -o rw,remount /vendor[/B]
Click to expand...
Click to collapse
my /system/vendor/etc/fstab.qcom is like your with a little difference only in this line
yours
Code:
/dev/block/bootdevice/by-name/userdata /data ext4 noatime,nosuid,nodev,barrier=1,noauto_da_alloc latemount,wait,check,reservedsize=128M,fileencryption=ice,quota
mine
Code:
/dev/block/bootdevice/by-name/userdata /data ext4 noatime,nosuid,nodev,barrier=1,noauto_da_alloc latemount,wait,check,reservedsize=128M,encryptable=ice,quota
i think that the parameter "fileencryption" and "encryptable" are synonyms
Code:
:/ # mount -o rw,remount /vendor
:/ # cd /etc
:/etc # >testfile
/system/bin/sh: can't create testfile: Read-only file system
nothing to do ... thank you for trying to help
any updates ?
---------- Post added at 09:41 PM ---------- Previous post was at 09:31 PM ----------
Try
mount -o rw,remount -t ext4 /full/path/to/modify
lapwat said:
any updates ?
Click to expand...
Click to collapse
nothing ... someone know the answer but take for self the correct procedure...
mount -o rw,remount -t ext4 /full/path/to/modify
Click to expand...
Click to collapse
[/QUOTE]
adding the filesystem type don't change the result ... the filesystem is autorecognized and re-mounted but without the write permission
thank you for the try
Thorezz said:
nothing ... someone know the answer but take for self the correct procedure...
adding the filesystem type don't change the result ... the filesystem is autorecognized and re-mounted but without the write permission
thank you for the try
Click to expand...
Click to collapse
I did
mount -o rw,remount /system/app/NQNfcNci
And it worked. Specify full path not only /system.
And you are right, ext4 option is not needed.
I found the solution
I know I am a bit late, but I was having issues modifying stuff in the /system/priv-app folder and every attempt of any mount call described up until now did NOT work.
BUT I found the solution: since I am using magisk (and you do too), the /system partition is somewhat "remapped" to /system_root.
So the solution is easy: just mount /system_root and you will be good to go:
Code:
mount -o rw,remount /system_root

Categories

Resources