[lttng-tools.git] / src / bin / lttng-relayd / index.c

/*
 * Copyright (C) 2013 - Julien Desfossez <jdesfossez@efficios.com>
 *                      David Goulet <dgoulet@efficios.com>
 *               2015 - Mathieu Desnoyers <mathieu.desnoyers@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.
 */

#define _GNU_SOURCE
#define _LGPL_SOURCE
#include <assert.h>

#include <common/common.h>
#include <common/utils.h>

#include "lttng-relayd.h"
#include "stream.h"
#include "index.h"

/*
 * Allocate a new relay index object. Pass the stream in which it is
 * contained as parameter. The sequence number will be used as the hash
 * table key.
 *
 * Called with stream mutex held.
 * Return allocated object or else NULL on error.
 */
static struct relay_index *relay_index_create(struct relay_stream *stream,
		uint64_t net_seq_num)
{
	struct relay_index *index;

	DBG2("Creating relay index for stream id %" PRIu64 " and seqnum %" PRIu64,
			stream->stream_handle, net_seq_num);

	index = zmalloc(sizeof(*index));
	if (!index) {
		PERROR("Relay index zmalloc");
		goto end;
	}
	if (!stream_get(stream)) {
		ERR("Cannot get stream");
		free(index);
		index = NULL;
		goto end;
	}
	index->stream = stream;

	lttng_ht_node_init_u64(&index->index_n, net_seq_num);
	pthread_mutex_init(&index->lock, NULL);
	pthread_mutex_init(&index->reflock, NULL);
	urcu_ref_init(&index->ref);

end:
	return index;
}

/*
 * Add unique relay index to the given hash table. In case of a collision, the
 * already existing object is put in the given _index variable.
 *
 * RCU read side lock MUST be acquired.
 */
static struct relay_index *relay_index_add_unique(struct relay_stream *stream,
		struct relay_index *index)
{
	struct cds_lfht_node *node_ptr;
	struct relay_index *_index;

	DBG2("Adding relay index with stream id %" PRIu64 " and seqnum %" PRIu64,
			stream->stream_handle, index->index_n.key);

	node_ptr = cds_lfht_add_unique(stream->indexes_ht->ht,
			stream->indexes_ht->hash_fct(&index->index_n, lttng_ht_seed),
			stream->indexes_ht->match_fct, &index->index_n,
			&index->index_n.node);
	if (node_ptr != &index->index_n.node) {
		_index = caa_container_of(node_ptr, struct relay_index,
				index_n.node);
	} else {
		_index = NULL;
	}
	return _index;
}

/*
 * Should be called with RCU read-side lock held.
 */
static bool relay_index_get(struct relay_index *index)
{
	bool has_ref = false;

	DBG2("index get for stream id %" PRIu64 " and seqnum %" PRIu64 " refcount %d",
			index->stream->stream_handle, index->index_n.key,
			(int) index->ref.refcount);

	/* Confirm that the index refcount has not reached 0. */
	pthread_mutex_lock(&index->reflock);
	if (index->ref.refcount != 0) {
		has_ref = true;
		urcu_ref_get(&index->ref);
	}
	pthread_mutex_unlock(&index->reflock);

	return has_ref;
}

/*
 * Get a relayd index in within the given stream, or create it if not
 * present.
 *
 * Called with stream mutex held.
 * Return index object or else NULL on error.
 */
struct relay_index *relay_index_get_by_id_or_create(struct relay_stream *stream,
		 uint64_t net_seq_num)
{
	struct lttng_ht_node_u64 *node;
	struct lttng_ht_iter iter;
	struct relay_index *index = NULL;

	DBG3("Finding index for stream id %" PRIu64 " and seq_num %" PRIu64,
			stream->stream_handle, net_seq_num);

	rcu_read_lock();
	lttng_ht_lookup(stream->indexes_ht, &net_seq_num, &iter);
	node = lttng_ht_iter_get_node_u64(&iter);
	if (node) {
		index = caa_container_of(node, struct relay_index, index_n);
	} else {
		struct relay_index *oldindex;

		index = relay_index_create(stream, net_seq_num);
		if (!index) {
			ERR("Cannot create index for stream id %" PRIu64 " and seq_num %" PRIu64,
				index->stream->stream_handle, net_seq_num);
			goto end;
		}
		oldindex = relay_index_add_unique(stream, index);
		if (oldindex) {
			/* Added concurrently, keep old. */
			relay_index_put(index);
			index = oldindex;
			if (!relay_index_get(index)) {
				index = NULL;
			}
		} else {
			stream->indexes_in_flight++;
			index->in_hash_table = true;
		}
	}
end:
	rcu_read_unlock();
	DBG2("Index %sfound or created in HT for stream ID %" PRIu64 " and seqnum %" PRIu64,
			(index == NULL) ? "NOT " : "", index->stream->stream_handle, net_seq_num);
	return index;
}

int relay_index_set_fd(struct relay_index *index, struct stream_fd *index_fd,
		uint64_t data_offset)
{
	int ret = 0;

	pthread_mutex_lock(&index->lock);
	if (index->index_fd) {
		ret = -1;
		goto end;
	}
	stream_fd_get(index_fd);
	index->index_fd = index_fd;
	index->index_data.offset = data_offset;
end:
	pthread_mutex_unlock(&index->lock);
	return ret;
}

int relay_index_set_data(struct relay_index *index,
                const struct ctf_packet_index *data)
{
	int ret = 0;

	pthread_mutex_lock(&index->lock);
	if (index->has_index_data) {
		ret = -1;
		goto end;
	}
	/* Set everything except data_offset. */
	index->index_data.packet_size = data->packet_size;
	index->index_data.content_size = data->content_size;
	index->index_data.timestamp_begin = data->timestamp_begin;
	index->index_data.timestamp_end = data->timestamp_end;
	index->index_data.events_discarded = data->events_discarded;
	index->index_data.stream_id = data->stream_id;
	index->has_index_data = true;
end:
	pthread_mutex_unlock(&index->lock);
	return ret;
}

static void index_destroy(struct relay_index *index)
{
	free(index);
}

static void index_destroy_rcu(struct rcu_head *rcu_head)
{
	struct relay_index *index =
		caa_container_of(rcu_head, struct relay_index, rcu_node);

	index_destroy(index);
}

/* Stream lock must be held by the caller. */
static void index_release(struct urcu_ref *ref)
{
	struct relay_index *index = caa_container_of(ref, struct relay_index, ref);
	struct relay_stream *stream = index->stream;
	int ret;
	struct lttng_ht_iter iter;

	if (index->index_fd) {
		stream_fd_put(index->index_fd);
		index->index_fd = NULL;
	}
	if (index->in_hash_table) {
		/* Delete index from hash table. */
		iter.iter.node = &index->index_n.node;
		ret = lttng_ht_del(stream->indexes_ht, &iter);
		assert(!ret);
		stream->indexes_in_flight--;
	}

	stream_put(index->stream);
	index->stream = NULL;

	call_rcu(&index->rcu_node, index_destroy_rcu);
}

/*
 * Called with stream mutex held.
 *
 * Stream lock must be held by the caller.
 */
void relay_index_put(struct relay_index *index)
{
	DBG2("index put for stream id %" PRIu64 " and seqnum %" PRIu64 " refcount %d",
			index->stream->stream_handle, index->index_n.key,
			(int) index->ref.refcount);
	/*
	 * Ensure existance of index->lock for index unlock.
	 */
	rcu_read_lock();
	/*
	 * Index lock ensures that concurrent test and update of stream
	 * ref is atomic.
	 */
	pthread_mutex_lock(&index->reflock);
	assert(index->ref.refcount != 0);
	urcu_ref_put(&index->ref, index_release);
	pthread_mutex_unlock(&index->reflock);
	rcu_read_unlock();
}

/*
 * Try to flush index to disk. Releases self-reference to index once
 * flush succeeds.
 *
 * Stream lock must be held by the caller.
 * Return 0 on successful flush, a negative value on error, or positive
 * value if no flush was performed.
 */
int relay_index_try_flush(struct relay_index *index)
{
	int ret = 1;
	bool flushed = false;
	int fd;

	pthread_mutex_lock(&index->lock);
	if (index->flushed) {
		goto skip;
	}
	/* Check if we are ready to flush. */
	if (!index->has_index_data || !index->index_fd) {
		goto skip;
	}
	fd = index->index_fd->fd;
	DBG2("Writing index for stream ID %" PRIu64 " and seq num %" PRIu64
			" on fd %d", index->stream->stream_handle,
			index->index_n.key, fd);
	flushed = true;
	index->flushed = true;
	ret = index_write(fd, &index->index_data, sizeof(index->index_data));
	if (ret == sizeof(index->index_data)) {
		ret = 0;
	} else {
		ret = -1;
	}
skip:
	pthread_mutex_unlock(&index->lock);

	if (flushed) {
		/* Put self-ref from index now that it has been flushed. */
		relay_index_put(index);
	}
	return ret;
}

/*
 * Close every relay index within a given stream, without flushing
 * them.
 */
void relay_index_close_all(struct relay_stream *stream)
{
	struct lttng_ht_iter iter;
	struct relay_index *index;

	rcu_read_lock();
	cds_lfht_for_each_entry(stream->indexes_ht->ht, &iter.iter,
			index, index_n.node) {
		/* Put self-ref from index. */
		relay_index_put(index);
	}
	rcu_read_unlock();
}

void relay_index_close_partial_fd(struct relay_stream *stream)
{
	struct lttng_ht_iter iter;
	struct relay_index *index;

	rcu_read_lock();
	cds_lfht_for_each_entry(stream->indexes_ht->ht, &iter.iter,
			index, index_n.node) {
		if (!index->index_fd) {
			continue;
		}
		/*
		 * Partial index has its index_fd: we have only
		 * received its info from the data socket.
		 * Put self-ref from index.
		 */
		relay_index_put(index);
	}
	rcu_read_unlock();
}

uint64_t relay_index_find_last(struct relay_stream *stream)
{
	struct lttng_ht_iter iter;
	struct relay_index *index;
	uint64_t net_seq_num = -1ULL;

	rcu_read_lock();
	cds_lfht_for_each_entry(stream->indexes_ht->ht, &iter.iter,
			index, index_n.node) {
		if (net_seq_num == -1ULL ||
				index->index_n.key > net_seq_num) {
			net_seq_num = index->index_n.key;
		}
	}
	rcu_read_unlock();
	return net_seq_num;
}
Commit	Line	Data
1c20f0e2 JD	1	/*
	2	* Copyright (C) 2013 - Julien Desfossez <jdesfossez@efficios.com>
	3	* David Goulet <dgoulet@efficios.com>
7591bab1	4	* 2015 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
1c20f0e2 JD	5	*
	6	* This program is free software; you can redistribute it and/or modify it
	7	* under the terms of the GNU General Public License, version 2 only, as
	8	* published by the Free Software Foundation.
	9	*
	10	* This program is distributed in the hope that it will be useful, but WITHOUT
	11	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	12	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
	13	* more details.
	14	*
	15	* You should have received a copy of the GNU General Public License along with
	16	* this program; if not, write to the Free Software Foundation, Inc., 51
	17	* Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
	18	*/
	19
	20	#define _GNU_SOURCE
6c1c0768	21	#define _LGPL_SOURCE
1c20f0e2 JD	22	#include <assert.h>
	23
	24	#include <common/common.h>
	25	#include <common/utils.h>
	26
0a6518b0	27	#include "lttng-relayd.h"
7591bab1	28	#include "stream.h"
1c20f0e2 JD	29	#include "index.h"
	30
	31	/*
7591bab1 MD	32	* Allocate a new relay index object. Pass the stream in which it is
	33	* contained as parameter. The sequence number will be used as the hash
	34	* table key.
	35	*
	36	* Called with stream mutex held.
	37	* Return allocated object or else NULL on error.
1c20f0e2	38	*/
7591bab1 MD	39	static struct relay_index relay_index_create(struct relay_stream stream,
7591bab1 MD	40	uint64_t net_seq_num)
1c20f0e2	41	{
7591bab1	42	struct relay_index *index;
1c20f0e2	43
7591bab1 MD	44	DBG2("Creating relay index for stream id %" PRIu64 " and seqnum %" PRIu64,
7591bab1 MD	45	stream->stream_handle, net_seq_num);
1c20f0e2	46
7591bab1 MD	47	index = zmalloc(sizeof(*index));
	48	if (!index) {
	49	PERROR("Relay index zmalloc");
	50	goto end;
	51	}
	52	if (!stream_get(stream)) {
	53	ERR("Cannot get stream");
	54	free(index);
	55	index = NULL;
	56	goto end;
1c20f0e2	57	}
7591bab1	58	index->stream = stream;
1c20f0e2	59
7591bab1 MD	60	lttng_ht_node_init_u64(&index->index_n, net_seq_num);
	61	pthread_mutex_init(&index->lock, NULL);
	62	pthread_mutex_init(&index->reflock, NULL);
	63	urcu_ref_init(&index->ref);
	64
	65	end:
	66	return index;
1c20f0e2 JD	67	}
	68
	69	/*
7591bab1 MD	70	* Add unique relay index to the given hash table. In case of a collision, the
7591bab1 MD	71	* already existing object is put in the given _index variable.
1c20f0e2	72	*
7591bab1	73	* RCU read side lock MUST be acquired.
1c20f0e2	74	*/
7591bab1 MD	75	static struct relay_index relay_index_add_unique(struct relay_stream stream,
7591bab1 MD	76	struct relay_index *index)
1c20f0e2	77	{
7591bab1 MD	78	struct cds_lfht_node *node_ptr;
7591bab1 MD	79	struct relay_index *_index;
1c20f0e2	80
7591bab1 MD	81	DBG2("Adding relay index with stream id %" PRIu64 " and seqnum %" PRIu64,
7591bab1 MD	82	stream->stream_handle, index->index_n.key);
1c20f0e2	83
7591bab1 MD	84	node_ptr = cds_lfht_add_unique(stream->indexes_ht->ht,
	85	stream->indexes_ht->hash_fct(&index->index_n, lttng_ht_seed),
	86	stream->indexes_ht->match_fct, &index->index_n,
	87	&index->index_n.node);
	88	if (node_ptr != &index->index_n.node) {
	89	_index = caa_container_of(node_ptr, struct relay_index,
	90	index_n.node);
	91	} else {
	92	_index = NULL;
1c20f0e2	93	}
7591bab1 MD	94	return _index;
	95	}
	96
	97	/*
	98	* Should be called with RCU read-side lock held.
	99	*/
	100	static bool relay_index_get(struct relay_index *index)
	101	{
	102	bool has_ref = false;
1c20f0e2	103
7591bab1 MD	104	DBG2("index get for stream id %" PRIu64 " and seqnum %" PRIu64 " refcount %d",
	105	index->stream->stream_handle, index->index_n.key,
	106	(int) index->ref.refcount);
1c20f0e2	107
7591bab1 MD	108	/* Confirm that the index refcount has not reached 0. */
	109	pthread_mutex_lock(&index->reflock);
	110	if (index->ref.refcount != 0) {
	111	has_ref = true;
	112	urcu_ref_get(&index->ref);
	113	}
	114	pthread_mutex_unlock(&index->reflock);
	115
	116	return has_ref;
1c20f0e2 JD	117	}
	118
	119	/*
7591bab1 MD	120	* Get a relayd index in within the given stream, or create it if not
7591bab1 MD	121	* present.
1c20f0e2	122	*
7591bab1	123	* Called with stream mutex held.
1c20f0e2 JD	124	* Return index object or else NULL on error.
1c20f0e2 JD	125	*/
7591bab1 MD	126	struct relay_index relay_index_get_by_id_or_create(struct relay_stream stream,
7591bab1 MD	127	uint64_t net_seq_num)
1c20f0e2	128	{
7591bab1	129	struct lttng_ht_node_u64 *node;
1c20f0e2	130	struct lttng_ht_iter iter;
1c20f0e2 JD	131	struct relay_index *index = NULL;
1c20f0e2 JD	132
1c20f0e2	133	DBG3("Finding index for stream id %" PRIu64 " and seq_num %" PRIu64,
7591bab1	134	stream->stream_handle, net_seq_num);
1c20f0e2	135
7591bab1 MD	136	rcu_read_lock();
	137	lttng_ht_lookup(stream->indexes_ht, &net_seq_num, &iter);
	138	node = lttng_ht_iter_get_node_u64(&iter);
	139	if (node) {
	140	index = caa_container_of(node, struct relay_index, index_n);
	141	} else {
	142	struct relay_index *oldindex;
	143
	144	index = relay_index_create(stream, net_seq_num);
	145	if (!index) {
	146	ERR("Cannot create index for stream id %" PRIu64 " and seq_num %" PRIu64,
	147	index->stream->stream_handle, net_seq_num);
	148	goto end;
	149	}
	150	oldindex = relay_index_add_unique(stream, index);
	151	if (oldindex) {
	152	/* Added concurrently, keep old. */
	153	relay_index_put(index);
	154	index = oldindex;
	155	if (!relay_index_get(index)) {
	156	index = NULL;
	157	}
	158	} else {
	159	stream->indexes_in_flight++;
	160	index->in_hash_table = true;
	161	}
1c20f0e2	162	}
1c20f0e2	163	end:
7591bab1 MD	164	rcu_read_unlock();
	165	DBG2("Index %sfound or created in HT for stream ID %" PRIu64 " and seqnum %" PRIu64,
	166	(index == NULL) ? "NOT " : "", index->stream->stream_handle, net_seq_num);
1c20f0e2 JD	167	return index;
	168	}
	169
7591bab1 MD	170	int relay_index_set_fd(struct relay_index index, struct stream_fd index_fd,
7591bab1 MD	171	uint64_t data_offset)
1c20f0e2	172	{
7591bab1	173	int ret = 0;
1c20f0e2	174
7591bab1 MD	175	pthread_mutex_lock(&index->lock);
	176	if (index->index_fd) {
	177	ret = -1;
	178	goto end;
	179	}
	180	stream_fd_get(index_fd);
	181	index->index_fd = index_fd;
	182	index->index_data.offset = data_offset;
	183	end:
	184	pthread_mutex_unlock(&index->lock);
	185	return ret;
	186	}
1c20f0e2	187
7591bab1 MD	188	int relay_index_set_data(struct relay_index *index,
	189	const struct ctf_packet_index *data)
	190	{
	191	int ret = 0;
1c20f0e2	192
7591bab1 MD	193	pthread_mutex_lock(&index->lock);
	194	if (index->has_index_data) {
	195	ret = -1;
	196	goto end;
1c20f0e2	197	}
7591bab1 MD	198	/* Set everything except data_offset. */
	199	index->index_data.packet_size = data->packet_size;
	200	index->index_data.content_size = data->content_size;
	201	index->index_data.timestamp_begin = data->timestamp_begin;
	202	index->index_data.timestamp_end = data->timestamp_end;
	203	index->index_data.events_discarded = data->events_discarded;
	204	index->index_data.stream_id = data->stream_id;
	205	index->has_index_data = true;
	206	end:
	207	pthread_mutex_unlock(&index->lock);
	208	return ret;
1c20f0e2 JD	209	}
1c20f0e2 JD	210
7591bab1	211	static void index_destroy(struct relay_index *index)
1c20f0e2	212	{
7591bab1 MD	213	free(index);
7591bab1 MD	214	}
1c20f0e2	215
7591bab1 MD	216	static void index_destroy_rcu(struct rcu_head *rcu_head)
	217	{
	218	struct relay_index *index =
	219	caa_container_of(rcu_head, struct relay_index, rcu_node);
1c20f0e2	220
7591bab1	221	index_destroy(index);
1c20f0e2 JD	222	}
1c20f0e2 JD	223
7591bab1 MD	224	/* Stream lock must be held by the caller. */
7591bab1 MD	225	static void index_release(struct urcu_ref *ref)
1c20f0e2	226	{
7591bab1 MD	227	struct relay_index *index = caa_container_of(ref, struct relay_index, ref);
	228	struct relay_stream *stream = index->stream;
	229	int ret;
	230	struct lttng_ht_iter iter;
	231
	232	if (index->index_fd) {
	233	stream_fd_put(index->index_fd);
	234	index->index_fd = NULL;
	235	}
	236	if (index->in_hash_table) {
	237	/* Delete index from hash table. */
	238	iter.iter.node = &index->index_n.node;
	239	ret = lttng_ht_del(stream->indexes_ht, &iter);
	240	assert(!ret);
	241	stream->indexes_in_flight--;
	242	}
	243
	244	stream_put(index->stream);
	245	index->stream = NULL;
	246
	247	call_rcu(&index->rcu_node, index_destroy_rcu);
1c20f0e2 JD	248	}
	249
	250	/*
7591bab1 MD	251	* Called with stream mutex held.
	252	*
	253	* Stream lock must be held by the caller.
1c20f0e2	254	*/
7591bab1	255	void relay_index_put(struct relay_index *index)
1c20f0e2	256	{
7591bab1 MD	257	DBG2("index put for stream id %" PRIu64 " and seqnum %" PRIu64 " refcount %d",
	258	index->stream->stream_handle, index->index_n.key,
	259	(int) index->ref.refcount);
	260	/*
	261	* Ensure existance of index->lock for index unlock.
	262	*/
	263	rcu_read_lock();
	264	/*
	265	* Index lock ensures that concurrent test and update of stream
	266	* ref is atomic.
	267	*/
	268	pthread_mutex_lock(&index->reflock);
	269	assert(index->ref.refcount != 0);
	270	urcu_ref_put(&index->ref, index_release);
	271	pthread_mutex_unlock(&index->reflock);
	272	rcu_read_unlock();
1c20f0e2 JD	273	}
	274
	275	/*
7591bab1 MD	276	* Try to flush index to disk. Releases self-reference to index once
7591bab1 MD	277	* flush succeeds.
1c20f0e2	278	*
7591bab1 MD	279	* Stream lock must be held by the caller.
	280	* Return 0 on successful flush, a negative value on error, or positive
	281	* value if no flush was performed.
1c20f0e2	282	*/
7591bab1	283	int relay_index_try_flush(struct relay_index *index)
1c20f0e2	284	{
7591bab1 MD	285	int ret = 1;
	286	bool flushed = false;
	287	int fd;
1c20f0e2	288
7591bab1 MD	289	pthread_mutex_lock(&index->lock);
	290	if (index->flushed) {
	291	goto skip;
	292	}
	293	/* Check if we are ready to flush. */
	294	if (!index->has_index_data \|\| !index->index_fd) {
	295	goto skip;
	296	}
	297	fd = index->index_fd->fd;
	298	DBG2("Writing index for stream ID %" PRIu64 " and seq num %" PRIu64
	299	" on fd %d", index->stream->stream_handle,
	300	index->index_n.key, fd);
	301	flushed = true;
	302	index->flushed = true;
	303	ret = index_write(fd, &index->index_data, sizeof(index->index_data));
	304	if (ret == sizeof(index->index_data)) {
	305	ret = 0;
	306	} else {
	307	ret = -1;
	308	}
	309	skip:
	310	pthread_mutex_unlock(&index->lock);
1c20f0e2	311
7591bab1 MD	312	if (flushed) {
	313	/* Put self-ref from index now that it has been flushed. */
	314	relay_index_put(index);
	315	}
	316	return ret;
1c20f0e2 JD	317	}
	318
	319	/*
7591bab1 MD	320	* Close every relay index within a given stream, without flushing
7591bab1 MD	321	* them.
1c20f0e2	322	*/
7591bab1	323	void relay_index_close_all(struct relay_stream *stream)
1c20f0e2 JD	324	{
	325	struct lttng_ht_iter iter;
	326	struct relay_index *index;
	327
1c20f0e2	328	rcu_read_lock();
7591bab1 MD	329	cds_lfht_for_each_entry(stream->indexes_ht->ht, &iter.iter,
	330	index, index_n.node) {
	331	/* Put self-ref from index. */
	332	relay_index_put(index);
1c20f0e2 JD	333	}
	334	rcu_read_unlock();
	335	}
3d07a857 MD	336
	337	void relay_index_close_partial_fd(struct relay_stream *stream)
	338	{
	339	struct lttng_ht_iter iter;
	340	struct relay_index *index;
	341
	342	rcu_read_lock();
	343	cds_lfht_for_each_entry(stream->indexes_ht->ht, &iter.iter,
	344	index, index_n.node) {
	345	if (!index->index_fd) {
	346	continue;
	347	}
	348	/*
	349	* Partial index has its index_fd: we have only
	350	* received its info from the data socket.
	351	* Put self-ref from index.
	352	*/
	353	relay_index_put(index);
	354	}
	355	rcu_read_unlock();
	356	}
	357
	358	uint64_t relay_index_find_last(struct relay_stream *stream)
	359	{
	360	struct lttng_ht_iter iter;
	361	struct relay_index *index;
	362	uint64_t net_seq_num = -1ULL;
	363
	364	rcu_read_lock();
	365	cds_lfht_for_each_entry(stream->indexes_ht->ht, &iter.iter,
	366	index, index_n.node) {
	367	if (net_seq_num == -1ULL \|\|
	368	index->index_n.key > net_seq_num) {
	369	net_seq_num = index->index_n.key;
	370	}
	371	}
	372	rcu_read_unlock();
	373	return net_seq_num;
	374	}