After spending days on that topic i am in need of additional ideas 😉
Facts: MTK6757 / Android 7 / Kernel 4.4.15 / FS EXT4 (No F2FS) / Working Root
I have a fresh and clean 64MB EXT4 .IMG File in /data/adb. e2fsck agrees with that 😉
Problem: Mounting and/or writing to it via Loop Device fails.
What i have checked:
- Access rights of the file
- Acess rights of the block device
- Acess rights of the destination dir
- Manually created the block device
- Manually setup via losetup
- Played with all options
- SElinux Permissive / Enforcing
- It only gets mounted with “mount” because it calls a ioctl BLKROSET (thx strace)
- Mount and /proc/mounts show RW
- As soon as i write (mkdir) to it, it switches to RO (dmesg says Switching to RO cause of Buffer I/O error on dev loop0, logical block 0, lost sync page write)
When i enforce writing it gets written to cache but not to the file
ioctl /dev/block/loop0 0x125d 1 mkdir /sbin/.core/img/test
And now the strange part:
When the img file is on /sdcard it works.
The SE Context is of course different, but i also tried in Permissive.
When the mounting occurs BEFORE Zygote starts, it fails also on /sdcard
Anybody any ideas ?
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