+ /*
+ * prev_path_name is only used for session rotation support.
+ * It is essentially used to work around the fact that index
+ * files are always created from the 'data' connection.
+ *
+ * Hence, it is possible to receive a ROTATE_STREAM command
+ * which affects the stream's path_name before the creation of
+ * an index file. In this situation, the index file of the
+ * 'previous' chunk would be created in the new destination folder.
+ *
+ * It would then be unlinked when the actual index of the new chunk
+ * is created.
+ */
+ char *prev_path_name;