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diff --git a/src/bin/lttng-relayd/index-file.h b/src/bin/lttng-relayd/index-file.h
new file mode 100644
index 000000000..fa34f1319
--- /dev/null
+++ b/src/bin/lttng-relayd/index-file.h
@@ -0,0 +1,47 @@
+/*
+ * Copyright (C) 2018 - Jérémie Galarneau <jeremie.galarneau@efficios.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License, version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc., 51
+ * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#ifndef RELAY_INDEX_FILE_H
+#define RELAY_INDEX_FILE_H
+
+#include <stdint.h>
+#include <common/index/ctf-index.h>
+
+struct relay_index_file;
+
+/*
+ * create and open have refcount of 1. Use put to decrement the
+ * refcount. Destroys when reaching 0. Use "get" to increment refcount.
+ */
+struct relay_index_file *relay_index_file_create(const char *path_name,
+		const char *stream_name, uint64_t size,
+		uint64_t count, uint32_t major, uint32_t minor);
+struct relay_index_file *relay_index_file_open(const char *path_name,
+		const char *channel_name, uint64_t tracefile_count,
+		uint64_t tracefile_count_current);
+
+int relay_index_file_write(const struct relay_index_file *index_file,
+		const struct ctf_packet_index *element);
+int relay_index_file_read(const struct relay_index_file *index_file,
+		struct ctf_packet_index *element);
+
+int relay_index_file_seek_end(struct relay_index_file *index_file);
+
+void relay_index_file_get(struct relay_index_file *index_file);
+void relay_index_file_put(struct relay_index_file *index_file);
+
+#endif /* RELAY_INDEX_FILE_H */