+ # fsync the files in their old locations.
+ fsync(tmp_data)
+ fsync(tmp_state)
+
+ # sync the directory as well, to ensure that the file is reachable
+ # from the dirent and has been updated to account for any allocations.
+ fdirsync(File.dirname(tmp_data))
+ fdirsync(File.dirname(tmp_state))
+