make sure some newer FS magic macros are defined

base/file_util_linux.cc

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/file_util.h"
 
 #include <errno.h>
 #include <linux/magic.h>
 #include <sys/vfs.h>
 
 #include "base/files/file_path.h"
 
+// Make sure some of the newer macros from magic.h are defined.
+// TODO(mostynb@opera.com): remove this after 2014.
+#ifndef BTRFS_SUPER_MAGIC
+#define BTRFS_SUPER_MAGIC 0x9123683E
+#endif
+#ifndef HUGETLBFS_MAGIC
+#define HUGETLBFS_MAGIC 0x958458f6
+#endif
+#ifndef TMPFS_MAGIC
+#define TMPFS_MAGIC 0x01021994
+#endif
+
 namespace file_util {
 
 bool GetFileSystemType(const base::FilePath& path, FileSystemType* type) {
   struct statfs statfs_buf;
   if (statfs(path.value().c_str(), &statfs_buf) < 0) {
     if (errno == ENOENT)
       return false;
     *type = FILE_SYSTEM_UNKNOWN;
     return true;
   }
@@ skipping 30 matching lines @@
     case CGROUP_SUPER_MAGIC:
       *type = FILE_SYSTEM_CGROUP;
       break;
     default:
       *type = FILE_SYSTEM_OTHER;
   }
   return true;
 }
 
 }  // namespace file_util