I have a rooted OnePlus One running LineageOS 15.1 (Oreo 8.1). I am trying to adjust some file permissions/ownerships on the emulated sdcard partition.
The partition seems to be mounted as an sdcardfs:
A0001:/ # mount | grep /storage/emulated
/data/media on /storage/emulated type sdcardfs (rw,nosuid,nodev,noexec,noatime,fsuid=1023,fsgid=1023,gid=1015,multiuser,mask=6,derive_gid)
I'm not sure what that means. Some people suggest that Android used to use mount then switched to fuse and now with Oero uses sdcardfs. I'm not sure if that makes any sense, but I'm a bit scared that something like mount -o remount, rw /mnt/sdcard/ (which apparently is what you had to do in the past to be able to set file permissions on the emulated sdcard partition).
Short demonstration showing that file permissions won't be applied:
A0001:/ $ su
A0001:/ # ls -la /storage/emulated
total 12
drwx--x--x 4 root sdcard_rw 4096 2018-07-24 17:44 .
drwxr-xr-x 4 root root 80 2018-07-24 17:21 ..
drwxrwx--x 14 root sdcard_rw 4096 2018-07-24 17:20 0
drwxrwx--x 2 root sdcard_rw 4096 1970-01-01 01:12 obb
A0001:/ # touch /storage/emulated/a
A0001:/ # ls -la /storage/emulated/a
-rw------- 1 root sdcard_rw 0 2018-07-24 17:44 /storage/emulated/a
A0001:/ # chmod 777 /storage/emulated/a
A0001:/ # ls -la /storage/emulated/a
-rw------- 1 root sdcard_rw 0 2018-07-24 17:44 /storage/emulated/a
(Note: the same happens if I use /storage/emulated/0 instead of /storage/emulated)
My question is: What do I have to run in order to be able to change the file permissions and file ownerships on this weird sdcardfs partition.
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