Adding locks and parents to vfs.

Progress on #305.

src/xenia/vfs/device.h

@@ -13,6 +13,7 @@
 #include <memory>
 #include <string>
 
+#include "xenia/base/mutex.h"
 #include "xenia/base/string_buffer.h"
 #include "xenia/vfs/entry.h"
 
@@ -27,11 +28,12 @@ class Device {
   virtual bool Initialize() = 0;
   void Dump(StringBuffer* string_buffer);
 
+  xe::mutex& mutex() { return mutex_; }
   const std::string& mount_path() const { return mount_path_; }
 
   virtual bool is_read_only() const { return true; }
 
-  Entry* ResolvePath(const char* path);
+  Entry* ResolvePath(std::string path);
 
   virtual uint32_t total_allocation_units() const = 0;
   virtual uint32_t available_allocation_units() const = 0;
@@ -39,6 +41,7 @@ class Device {
   virtual uint32_t bytes_per_sector() const = 0;
 
  protected:
+  xe::mutex mutex_;
   std::string mount_path_;
   std::unique_ptr<Entry> root_entry_;
 };