--- /dev/null
+#ifndef _RELAY_INDEX_H
+#define _RELAY_INDEX_H
+
+/*
+ * Copyright (C) 2013 Julien Desfossez <jdesfossez@efficios.com>
+ * Copyright (C) 2013 David Goulet <dgoulet@efficios.com>
+ * Copyright (C) 2015 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0-only
+ *
+ */
+
+#include <inttypes.h>
+#include <pthread.h>
+
+#include <common/hashtable/hashtable.hpp>
+#include <common/index/index.hpp>
+
+struct relay_stream;
+struct relay_connection;
+struct lttcomm_relayd_index;
+
+struct relay_index {
+ /*
+ * index lock nests inside stream lock.
+ */
+ struct urcu_ref ref; /* Reference from getters. */
+ struct relay_stream *stream; /* Back ref to stream */
+
+ pthread_mutex_t lock;
+ /*
+ * index file on which to write the index data. May differ from
+ * stream->index_file due to tracefile rotation.
+ */
+ struct lttng_index_file *index_file;
+
+ /* Index packet data. This is the data that is written on disk. */
+ struct ctf_packet_index index_data;
+ /* Data + padding size of this packet, filled by the data thread. */
+ uint64_t total_size;
+
+ bool has_index_data;
+ bool flushed;
+ bool in_hash_table;
+
+ /*
+ * Node within indexes_ht that corresponds to this struct
+ * relay_index. Indexed by net_seq_num, which is unique for this
+ * index across the stream.
+ */
+ struct lttng_ht_node_u64 index_n;
+ struct rcu_head rcu_node; /* For call_rcu teardown. */
+};
+
+struct relay_index *relay_index_get_by_id_or_create(struct relay_stream *stream,
+ uint64_t net_seq_num);
+void relay_index_put(struct relay_index *index);
+int relay_index_set_file(struct relay_index *index,
+ struct lttng_index_file *index_file,
+ uint64_t data_offset);
+int relay_index_set_data(struct relay_index *index,
+ const struct ctf_packet_index *data);
+int relay_index_try_flush(struct relay_index *index);
+
+void relay_index_close_all(struct relay_stream *stream);
+void relay_index_close_partial_fd(struct relay_stream *stream);
+uint64_t relay_index_find_last(struct relay_stream *stream);
+int relay_index_switch_all_files(struct relay_stream *stream);
+int relay_index_set_control_data(struct relay_index *index,
+ const struct lttcomm_relayd_index *data,
+ unsigned int minor_version);
+
+#endif /* _RELAY_INDEX_H */