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And still the permissions will remain same when viewed from emulated view /sdcard. It's possible to change permission bits of file on underlying actual filesystem, but accessing /data/media requires root access because only UID/GID 1023 ( aid_media_rw) has read access to the directory. So the commands chmod and chown have no impact, whether executed through CLI (adb shell or terminal emulator) or GUI (file explorer). sdcardfs and its predecessor FUSE expose the emulated filesystem with a fixed set of uid, gid and mask (mode). For more information, see Edit a previously uploaded file when your Yammer connected group stores files in SharePoint.
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This means that instead of editing a file, youll need to download and re-upload the file, and edit the newly uploaded version. However Android's internal (confusingly called external) storage which is accessible by installed apps at /sdcard, is not an actual but virtual / emulated filesystem exposing /data/media (which is a real filesystem) through sdcardfs. As part of this change, all existing files stored in Yammer for connected groups are made read-only. Common examples of such filesystems are ext4 and f2fs.
S7 change where files are stored android#
On all operating systems based on Linux kernel - like Android is - it's possible to set permissions on files (including directories) provided that filesystem supports UNIX permissions (uid, gid, mode). This saves any contacts not already saved to your Google or Samsung account.