DoAutomaticFreeDiskSpaceControl() introduced

platform.cc

 // Copyright (c) 2009-2010 The Chromium OS Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Contains the implementation of class Platform
 
 #include "platform.h"
 
 #include <errno.h>
 #include <limits.h>
 #include <pwd.h>
 #include <signal.h>
 #include <sys/mount.h>
 #include <sys/stat.h>
+#include <sys/statvfs.h>
 #include <sys/types.h>
 
 #include <base/file_util.h>
 #include <base/string_util.h>
 
 // Included last to avoid redefinition problems
 extern "C" {
 #include <keyutils.h>
 }
 
@@ skipping 334 matching lines @@
   std::vector<char> user_name_buf(user_name_length);
   if (getpwnam_r(user.c_str(), &user_info, &user_name_buf[0],
                 user_name_length, &user_infop)) {
     return false;
   }
   *user_id = user_info.pw_uid;
   *group_id = user_info.pw_gid;
   return true;
 }
 
+int64 Platform::AmountOfFreeDiskSpace(const string& path) {
+  struct statvfs stats;
+  if (statvfs(path.c_str(), &stats) != 0) {
+    return -1;
+  }
+  return static_cast<int64>(stats.f_bavail) * stats.f_frsize;
+}
+
 void Platform::ClearUserKeyring() {
   keyctl(KEYCTL_CLEAR, KEY_SPEC_USER_KEYRING);
 }
 
 } // namespace cryptohome