Add a new "virtual disk" feature.

It's extremely difficult to test storage related logic on devices
that don't have physical SD card slots.  So to support better
debugging and testing, add a new "virtual disk" feature which mounts
a 512MB file through loop device.

Also move ParcelFileDescriptor.open() over to using Os.open() so
that it gets StrictMode treatment.

Bug: 34903607
Test: builds, boots, virtual disk works
Change-Id: I072a3a412cfcc8a2a3472919b7273a1ed794fd98

1 files changed, 9 insertions, 0 deletions

diff --git a/cmds/sm/src/com/android/commands/sm/Sm.java b/cmds/sm/src/com/android/commands/sm/Sm.java
index db3772da9e4f..658d662de5e1 100644
--- a/cmds/sm/src/com/android/commands/sm/Sm.java
+++ b/cmds/sm/src/com/android/commands/sm/Sm.java
@@ -94,6 +94,8 @@ public final class Sm {
             runGetFbeMode();
         } else if ("fstrim".equals(op)) {
             runFstrim();
+        } else if ("set-virtual-disk".equals(op)) {
+            runSetVirtualDisk();
         } else {
             throw new IllegalArgumentException();
         }
@@ -225,6 +227,12 @@ public final class Sm {
         mSm.fstrim(0);
     }
 
+    public void runSetVirtualDisk() throws RemoteException {
+        final boolean virtualDisk = Boolean.parseBoolean(nextArg());
+        mSm.setDebugFlags(virtualDisk ? StorageManager.DEBUG_VIRTUAL_DISK : 0,
+                StorageManager.DEBUG_VIRTUAL_DISK);
+    }
+
     private String nextArg() {
         if (mNextArg >= mArgs.length) {
             return null;
@@ -240,6 +248,7 @@ public final class Sm {
         System.err.println("       sm has-adoptable");
         System.err.println("       sm get-primary-storage-uuid");
         System.err.println("       sm set-force-adoptable [true|false]");
+        System.err.println("       sm set-virtual-disk [true|false]");
         System.err.println("");
         System.err.println("       sm partition DISK [public|private|mixed] [ratio]");
         System.err.println("       sm mount VOLUME");