Improved the entry listing

src/disk.h

@@ -6,6 +6,7 @@ typedef struct {
 	uint64_t size;
 	uint64_t allocated;
 	char* backing_file;
+	char* backing_identifier;
 } DiskInfo;
 
 Status CreateRootDisk(const char* path, uint64_t disk_size);
@@ -15,4 +16,4 @@ Status TrimDisk(const char* path);
 Status RebaseDisk(const char* path, const char* backing_file);
 
 Status GetDiskInfo(const char* path, DiskInfo* _info);
-void FreeDiskInfo(DiskInfo* info);
+void FreeDiskInfo(DiskInfo* info);