Create a new MOUNT_EXTERNAL_LEGACY storage mode.
Apps that are already installed on the device before isolated_storage
feature is enabled will be granted MOUNT_EXTERNAL_LEGACY mode. In this
mode, /mnt/runtime/write will be mounted at /storage giving them same
level of access as in P.
A new mount directory /mnt/runtime/full is also created which will be
used for mounting at /storage for apps started with MOUNT_EXTERNAL_FULL
mode. This will allow apps with WRITE_MEDIA_STORAGE permission to
read/write anywhere on the secondary devices without needing to bypass
sdcardfs.
Bug: 121277410
Test: manual
Test: atest android.appsecurity.cts.ExternalStorageHostTest
Change-Id: I4ec73276d7c586ae4afc482580d1eb8ee03d5be1
diff --git a/core/java/com/android/internal/os/Zygote.java b/core/java/com/android/internal/os/Zygote.java
index f5746ca..705bae4 100644
--- a/core/java/com/android/internal/os/Zygote.java
+++ b/core/java/com/android/internal/os/Zygote.java
@@ -82,6 +82,11 @@
/** Read-write external storage should be mounted. */
public static final int MOUNT_EXTERNAL_WRITE = IVold.REMOUNT_MODE_WRITE;
/**
+ * Mount mode for apps that are already installed on the device before the isolated_storage
+ * feature is enabled.
+ */
+ public static final int MOUNT_EXTERNAL_LEGACY = IVold.REMOUNT_MODE_LEGACY;
+ /**
* Mount mode for package installers which should give them access to
* all obb dirs in addition to their package sandboxes
*/