Replace EnsureDirExists with a call to setupAppDir

Test: Manually verified ownership of /storage/emulated/0/Android/data on cf_x86_phone-userdebug after enabling feature
Bug: 151455752

Change-Id: I75a1e3b769476e56094e41d82e7f8e1a72827ded

VolumeManager.cpp

@@ -776,7 +776,8 @@ static std::string getStorageDirTarget(userid_t userId, std::string dirName,
 }
 
 // Fork the process and remount storage
-static bool forkAndRemountStorage(int uid, int pid, const std::vector<std::string>& packageNames) {
+bool VolumeManager::forkAndRemountStorage(int uid, int pid,
+                                          const std::vector<std::string>& packageNames) {
     userid_t userId = multiuser_get_user_id(uid);
     std::string mnt_path = StringPrintf("/proc/%d/ns/mnt", pid);
     android::base::unique_fd nsFd(
@@ -814,7 +815,8 @@ static bool forkAndRemountStorage(int uid, int pid, const std::vector<std::strin
             PLOG(ERROR) << "Failed to create dir: " << sources_cstr[i];
             return false;
         }
-        status = EnsureDirExists(targets_cstr[i], 0771, AID_MEDIA_RW, AID_MEDIA_RW);
+        // Make sure /storage/emulated/... paths are setup correctly
+        status = setupAppDir(targets_cstr[i], uid, false /* fixupExistingOnly */);
         if (status != OK) {
             PLOG(ERROR) << "Failed to create dir: " << targets_cstr[i];
             return false;

VolumeManager.h

@@ -130,6 +130,8 @@ class VolumeManager {
     int updateVirtualDisk();
     int setDebug(bool enable);
 
+    bool forkAndRemountStorage(int uid, int pid, const std::vector<std::string>& packageNames);
+
     static VolumeManager* Instance();
 
     /*