diff --git a/cmds/sm/src/com/android/commands/sm/Sm.java b/cmds/sm/src/com/android/commands/sm/Sm.java
index c6d717a..783c8c4 100644
--- a/cmds/sm/src/com/android/commands/sm/Sm.java
+++ b/cmds/sm/src/com/android/commands/sm/Sm.java
@@ -127,6 +127,8 @@
             filterType = VolumeInfo.TYPE_PRIVATE;
         } else if ("emulated".equals(filter)) {
             filterType = VolumeInfo.TYPE_EMULATED;
+        } else if ("stub".equals(filter)) {
+            filterType = VolumeInfo.TYPE_STUB;
         } else {
             filterType = -1;
         }
@@ -314,7 +316,7 @@
 
     private static int showUsage() {
         System.err.println("usage: sm list-disks [adoptable]");
-        System.err.println("       sm list-volumes [public|private|emulated|all]");
+        System.err.println("       sm list-volumes [public|private|emulated|stub|all]");
         System.err.println("       sm has-adoptable");
         System.err.println("       sm get-primary-storage-uuid");
         System.err.println("       sm set-force-adoptable [on|off|default]");
diff --git a/core/java/android/os/storage/StorageManager.java b/core/java/android/os/storage/StorageManager.java
index 8a36a78..d679fc7 100644
--- a/core/java/android/os/storage/StorageManager.java
+++ b/core/java/android/os/storage/StorageManager.java
@@ -801,7 +801,7 @@
         try {
             for (VolumeInfo vol : mStorageManager.getVolumes(0)) {
                 if (vol.path != null && FileUtils.contains(vol.path, pathString)
-                        && vol.type != VolumeInfo.TYPE_PUBLIC) {
+                        && vol.type != VolumeInfo.TYPE_PUBLIC && vol.type != VolumeInfo.TYPE_STUB) {
                     // TODO: verify that emulated adopted devices have UUID of
                     // underlying volume
                     try {
diff --git a/core/java/android/os/storage/VolumeInfo.java b/core/java/android/os/storage/VolumeInfo.java
index e55afb6..8c3aa17 100644
--- a/core/java/android/os/storage/VolumeInfo.java
+++ b/core/java/android/os/storage/VolumeInfo.java
@@ -84,6 +84,7 @@
     public static final int TYPE_EMULATED = IVold.VOLUME_TYPE_EMULATED;
     public static final int TYPE_ASEC = IVold.VOLUME_TYPE_ASEC;
     public static final int TYPE_OBB = IVold.VOLUME_TYPE_OBB;
+    public static final int TYPE_STUB = IVold.VOLUME_TYPE_STUB;
 
     public static final int STATE_UNMOUNTED = IVold.VOLUME_STATE_UNMOUNTED;
     public static final int STATE_CHECKING = IVold.VOLUME_STATE_CHECKING;
@@ -295,7 +296,7 @@
     }
 
     public boolean isVisibleForUser(int userId) {
-        if (type == TYPE_PUBLIC && mountUserId == userId) {
+        if ((type == TYPE_PUBLIC || type == TYPE_STUB) && mountUserId == userId) {
             return isVisible();
         } else if (type == TYPE_EMULATED) {
             return isVisible();
@@ -327,7 +328,7 @@
     public File getPathForUser(int userId) {
         if (path == null) {
             return null;
-        } else if (type == TYPE_PUBLIC) {
+        } else if (type == TYPE_PUBLIC || type == TYPE_STUB) {
             return new File(path);
         } else if (type == TYPE_EMULATED) {
             return new File(path, Integer.toString(userId));
@@ -344,7 +345,7 @@
     public File getInternalPathForUser(int userId) {
         if (path == null) {
             return null;
-        } else if (type == TYPE_PUBLIC) {
+        } else if (type == TYPE_PUBLIC || type == TYPE_STUB) {
             // TODO: plumb through cleaner path from vold
             return new File(path.replace("/storage/", "/mnt/media_rw/"));
         } else {
@@ -390,7 +391,7 @@
                 removable = true;
             }
 
-        } else if (type == TYPE_PUBLIC) {
+        } else if (type == TYPE_PUBLIC || type == TYPE_STUB) {
             emulated = false;
             removable = true;
 
@@ -447,7 +448,8 @@
 
     public @Nullable Intent buildBrowseIntentForUser(int userId) {
         final Uri uri;
-        if (type == VolumeInfo.TYPE_PUBLIC && mountUserId == userId) {
+        if ((type == VolumeInfo.TYPE_PUBLIC || type == VolumeInfo.TYPE_STUB)
+                && mountUserId == userId) {
             uri = DocumentsContract.buildRootUri(DOCUMENT_AUTHORITY, fsUuid);
         } else if (type == VolumeInfo.TYPE_EMULATED && isPrimary()) {
             uri = DocumentsContract.buildRootUri(DOCUMENT_AUTHORITY,
diff --git a/packages/ExternalStorageProvider/src/com/android/externalstorage/ExternalStorageProvider.java b/packages/ExternalStorageProvider/src/com/android/externalstorage/ExternalStorageProvider.java
index 4e52ff6d..4abcf73 100644
--- a/packages/ExternalStorageProvider/src/com/android/externalstorage/ExternalStorageProvider.java
+++ b/packages/ExternalStorageProvider/src/com/android/externalstorage/ExternalStorageProvider.java
@@ -186,7 +186,8 @@
                     title = mStorageManager.getBestVolumeDescription(privateVol);
                     storageUuid = StorageManager.convert(privateVol.fsUuid);
                 }
-            } else if (volume.getType() == VolumeInfo.TYPE_PUBLIC
+            } else if ((volume.getType() == VolumeInfo.TYPE_PUBLIC
+                            || volume.getType() == VolumeInfo.TYPE_STUB)
                     && volume.getMountUserId() == userId) {
                 rootId = volume.getFsUuid();
                 title = mStorageManager.getBestVolumeDescription(volume);
diff --git a/packages/SettingsLib/src/com/android/settingslib/deviceinfo/StorageMeasurement.java b/packages/SettingsLib/src/com/android/settingslib/deviceinfo/StorageMeasurement.java
index 5a57e69..8f9394f 100644
--- a/packages/SettingsLib/src/com/android/settingslib/deviceinfo/StorageMeasurement.java
+++ b/packages/SettingsLib/src/com/android/settingslib/deviceinfo/StorageMeasurement.java
@@ -152,7 +152,8 @@
         final MeasurementDetails details = new MeasurementDetails();
         if (mVolume == null) return details;
 
-        if (mVolume.getType() == VolumeInfo.TYPE_PUBLIC) {
+        if (mVolume.getType() == VolumeInfo.TYPE_PUBLIC
+                || mVolume.getType() == VolumeInfo.TYPE_STUB) {
             details.totalSize = mVolume.getPath().getTotalSpace();
             details.availSize = mVolume.getPath().getUsableSpace();
             return details;
diff --git a/services/core/java/com/android/server/StorageManagerService.java b/services/core/java/com/android/server/StorageManagerService.java
index 5b3ab85..78e82b6 100644
--- a/services/core/java/com/android/server/StorageManagerService.java
+++ b/services/core/java/com/android/server/StorageManagerService.java
@@ -1235,6 +1235,9 @@
         } else if (vol.type == VolumeInfo.TYPE_PRIVATE) {
             mHandler.obtainMessage(H_VOLUME_MOUNT, vol).sendToTarget();
 
+        } else if (vol.type == VolumeInfo.TYPE_STUB) {
+            vol.mountUserId = mCurrentUserId;
+            mHandler.obtainMessage(H_VOLUME_MOUNT, vol).sendToTarget();
         } else {
             Slog.d(TAG, "Skipping automatic mounting of " + vol);
         }
@@ -1245,6 +1248,7 @@
             case VolumeInfo.TYPE_PRIVATE:
             case VolumeInfo.TYPE_PUBLIC:
             case VolumeInfo.TYPE_EMULATED:
+            case VolumeInfo.TYPE_STUB:
                 break;
             default:
                 return false;
@@ -1321,7 +1325,8 @@
             }
         }
 
-        if (vol.type == VolumeInfo.TYPE_PUBLIC && vol.state == VolumeInfo.STATE_EJECTING) {
+        if ((vol.type == VolumeInfo.TYPE_PUBLIC || vol.type == VolumeInfo.TYPE_STUB)
+                    && vol.state == VolumeInfo.STATE_EJECTING) {
             // TODO: this should eventually be handled by new ObbVolume state changes
             /*
              * Some OBBs might have been unmounted when this volume was
@@ -1403,7 +1408,8 @@
         }
 
         boolean isTypeRestricted = false;
-        if (vol.type == VolumeInfo.TYPE_PUBLIC || vol.type == VolumeInfo.TYPE_PRIVATE) {
+        if (vol.type == VolumeInfo.TYPE_PUBLIC || vol.type == VolumeInfo.TYPE_PRIVATE
+                || vol.type == VolumeInfo.TYPE_STUB) {
             isTypeRestricted = userManager
                     .hasUserRestriction(UserManager.DISALLOW_MOUNT_PHYSICAL_MEDIA,
                     Binder.getCallingUserHandle());
@@ -2834,6 +2840,7 @@
                 final VolumeInfo vol = mVolumes.valueAt(i);
                 switch (vol.getType()) {
                     case VolumeInfo.TYPE_PUBLIC:
+                    case VolumeInfo.TYPE_STUB:
                     case VolumeInfo.TYPE_EMULATED:
                         break;
                     default: