[lttng-tools.git] / src / bin / lttng-relayd / viewer-stream.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 _LGPL_SOURCE
#include <common/common.h>
#include <common/index/index.h>
#include <common/compat/string.h>

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

static void viewer_stream_destroy(struct relay_viewer_stream *vstream)
{
	lttng_trace_chunk_put(vstream->stream_file.trace_chunk);
	free(vstream->path_name);
	free(vstream->channel_name);
	free(vstream);
}

static void viewer_stream_destroy_rcu(struct rcu_head *head)
{
	struct relay_viewer_stream *vstream =
		caa_container_of(head, struct relay_viewer_stream, rcu_node);

	viewer_stream_destroy(vstream);
}

struct relay_viewer_stream *viewer_stream_create(struct relay_stream *stream,
		enum lttng_viewer_seek seek_t)
{
	struct relay_viewer_stream *vstream = NULL;
	const bool acquired_reference = lttng_trace_chunk_get(
			stream->trace_chunk);

	if (!acquired_reference) {
		goto error;
	}

	vstream = zmalloc(sizeof(*vstream));
	if (!vstream) {
		PERROR("relay viewer stream zmalloc");
		goto error;
	}

	vstream->stream_file.trace_chunk = stream->trace_chunk;
	vstream->path_name = lttng_strndup(stream->path_name, LTTNG_VIEWER_PATH_MAX);
	if (vstream->path_name == NULL) {
		PERROR("relay viewer path_name alloc");
		goto error;
	}
	vstream->channel_name = lttng_strndup(stream->channel_name,
			LTTNG_VIEWER_NAME_MAX);
	if (vstream->channel_name == NULL) {
		PERROR("relay viewer channel_name alloc");
		goto error;
	}

	if (!stream_get(stream)) {
		ERR("Cannot get stream");
		goto error;
	}
	vstream->stream = stream;

	pthread_mutex_lock(&stream->lock);

	if (stream->is_metadata && stream->trace->viewer_metadata_stream) {
		ERR("Cannot attach viewer metadata stream to trace (busy).");
		goto error_unlock;
	}

	switch (seek_t) {
	case LTTNG_VIEWER_SEEK_BEGINNING:
	{
		uint64_t seq_tail = tracefile_array_get_seq_tail(stream->tfa);

		if (seq_tail == -1ULL) {
			/*
			 * Tail may not be initialized yet. Nonetheless, we know
			 * we want to send the first index once it becomes
			 * available.
			 */
			seq_tail = 0;
		}
		vstream->current_tracefile_id =
			tracefile_array_get_file_index_tail(stream->tfa);
		vstream->index_sent_seqcount = seq_tail;
		break;
	}
	case LTTNG_VIEWER_SEEK_LAST:
		vstream->current_tracefile_id =
			tracefile_array_get_file_index_head(stream->tfa);
		/*
		 * We seek at the very end of each stream, awaiting for
		 * a future packet to eventually come in.
		 *
		 * We don't need to check the head position for -1ULL since the
		 * increment will set it to 0.
		 */
		vstream->index_sent_seqcount =
				tracefile_array_get_seq_head(stream->tfa) + 1;
		break;
	default:
		goto error_unlock;
	}

	/*
	 * If we never received an index for the current stream, delay
	 * the opening of the index, otherwise open it right now.
	 */
	if (stream->index_received_seqcount == 0) {
		vstream->index_file = NULL;
	} else {
		const uint32_t connection_major = stream->trace->session->major;
		const uint32_t connection_minor = stream->trace->session->minor;

		vstream->index_file = lttng_index_file_create_from_trace_chunk_read_only(
				stream->trace_chunk, stream->path_name,
				stream->channel_name, stream->tracefile_size,
				vstream->current_tracefile_id,
				lttng_to_index_major(connection_major,
						connection_minor),
				lttng_to_index_minor(connection_major,
						connection_minor));
		if (!vstream->index_file) {
			goto error_unlock;
		}
	}

	if (seek_t == LTTNG_VIEWER_SEEK_LAST && vstream->index_file) {
		off_t lseek_ret;

		lseek_ret = lseek(vstream->index_file->fd, 0, SEEK_END);
		if (lseek_ret < 0) {
			goto error_unlock;
		}
	}
	if (stream->is_metadata) {
		rcu_assign_pointer(stream->trace->viewer_metadata_stream,
				vstream);
	}
	pthread_mutex_unlock(&stream->lock);

	/* Globally visible after the add unique. */
	lttng_ht_node_init_u64(&vstream->stream_n, stream->stream_handle);
	lttng_ht_add_unique_u64(viewer_streams_ht, &vstream->stream_n);

	urcu_ref_init(&vstream->ref);

	return vstream;

error_unlock:
	pthread_mutex_unlock(&stream->lock);
error:
	if (vstream) {
		viewer_stream_destroy(vstream);
	}
	return NULL;
}

static void viewer_stream_unpublish(struct relay_viewer_stream *vstream)
{
	int ret;
	struct lttng_ht_iter iter;

	iter.iter.node = &vstream->stream_n.node;
	ret = lttng_ht_del(viewer_streams_ht, &iter);
	assert(!ret);
}

static void viewer_stream_release(struct urcu_ref *ref)
{
	struct relay_viewer_stream *vstream = caa_container_of(ref,
			struct relay_viewer_stream, ref);

	if (vstream->stream->is_metadata) {
		rcu_assign_pointer(vstream->stream->trace->viewer_metadata_stream, NULL);
	}

	viewer_stream_unpublish(vstream);

	if (vstream->stream_file.fd) {
		stream_fd_put(vstream->stream_file.fd);
		vstream->stream_file.fd = NULL;
	}
	if (vstream->index_file) {
		lttng_index_file_put(vstream->index_file);
		vstream->index_file = NULL;
	}
	if (vstream->stream) {
		stream_put(vstream->stream);
		vstream->stream = NULL;
	}

	call_rcu(&vstream->rcu_node, viewer_stream_destroy_rcu);
}

/* Must be called with RCU read-side lock held. */
bool viewer_stream_get(struct relay_viewer_stream *vstream)
{
	return urcu_ref_get_unless_zero(&vstream->ref);
}

/*
 * Get viewer stream by id.
 *
 * Return viewer stream if found else NULL.
 */
struct relay_viewer_stream *viewer_stream_get_by_id(uint64_t id)
{
	struct lttng_ht_node_u64 *node;
	struct lttng_ht_iter iter;
	struct relay_viewer_stream *vstream = NULL;

	rcu_read_lock();
	lttng_ht_lookup(viewer_streams_ht, &id, &iter);
	node = lttng_ht_iter_get_node_u64(&iter);
	if (!node) {
		DBG("Relay viewer stream %" PRIu64 " not found", id);
		goto end;
	}
	vstream = caa_container_of(node, struct relay_viewer_stream, stream_n);
	if (!viewer_stream_get(vstream)) {
		vstream = NULL;
	}
end:
	rcu_read_unlock();
	return vstream;
}

void viewer_stream_put(struct relay_viewer_stream *vstream)
{
	rcu_read_lock();
	urcu_ref_put(&vstream->ref, viewer_stream_release);
	rcu_read_unlock();
}

/*
 * Rotate a stream to the next tracefile.
 *
 * Must be called with the rstream lock held.
 * Returns 0 on success, 1 on EOF, a negative value on error.
 */
int viewer_stream_rotate(struct relay_viewer_stream *vstream)
{
	int ret;
	uint64_t new_id;
	const struct relay_stream *stream = vstream->stream;
	const uint32_t connection_major = stream->trace->session->major;
	const uint32_t connection_minor = stream->trace->session->minor;

	/* Detect the last tracefile to open. */
	if (stream->index_received_seqcount
			== vstream->index_sent_seqcount
			&& stream->trace->session->connection_closed) {
		ret = 1;
		goto end;
	}

	if (stream->tracefile_count == 0) {
		/* Ignore rotation, there is none to do. */
		ret = 0;
		goto end;
	}

	/*
	 * Try to move to the next file.
	 */
	new_id = (vstream->current_tracefile_id + 1)
			% stream->tracefile_count;
	if (tracefile_array_seq_in_file(stream->tfa, new_id,
			vstream->index_sent_seqcount)) {
		vstream->current_tracefile_id = new_id;
	} else {
		uint64_t seq_tail = tracefile_array_get_seq_tail(stream->tfa);

		/*
		 * This can only be reached on overwrite, which implies there
		 * has been data written at some point, which will have set the
		 * tail.
		 */
		assert(seq_tail != -1ULL);
		/*
		 * We need to resync because we lag behind tail.
		 */
		vstream->current_tracefile_id =
			tracefile_array_get_file_index_tail(stream->tfa);
		vstream->index_sent_seqcount = seq_tail;
	}

	if (vstream->index_file) {
		lttng_index_file_put(vstream->index_file);
		vstream->index_file = NULL;
	}
	if (vstream->stream_file.fd) {
		stream_fd_put(vstream->stream_file.fd);
		vstream->stream_file.fd = NULL;
	}
	vstream->index_file =
			lttng_index_file_create_from_trace_chunk_read_only(
					stream->trace_chunk, stream->path_name,
					stream->channel_name,
					stream->tracefile_size,
					vstream->current_tracefile_id,
					lttng_to_index_major(connection_major,
							connection_minor),
					lttng_to_index_minor(connection_major,
							connection_minor));
	if (!vstream->index_file) {
		ret = -1;
		goto end;
	} else {
		ret = 0;
	}
end:
	return ret;
}

void print_viewer_streams(void)
{
	struct lttng_ht_iter iter;
	struct relay_viewer_stream *vstream;

	if (!viewer_streams_ht) {
		return;
	}

	rcu_read_lock();
	cds_lfht_for_each_entry(viewer_streams_ht->ht, &iter.iter, vstream,
			stream_n.node) {
		if (!viewer_stream_get(vstream)) {
			continue;
		}
		DBG("vstream %p refcount %ld stream %" PRIu64 " trace %" PRIu64
			" session %" PRIu64,
			vstream,
			vstream->ref.refcount,
			vstream->stream->stream_handle,
			vstream->stream->trace->id,
			vstream->stream->trace->session->id);
		viewer_stream_put(vstream);
	}
	rcu_read_unlock();
}
Commit	Line	Data
2f8f53af DG	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>
2f8f53af DG	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
6c1c0768	20	#define _LGPL_SOURCE
2f8f53af DG	21	#include <common/common.h>
2f8f53af DG	22	#include <common/index/index.h>
f5436bfc	23	#include <common/compat/string.h>
2f8f53af DG	24
	25	#include "lttng-relayd.h"
	26	#include "viewer-stream.h"
	27
7591bab1	28	static void viewer_stream_destroy(struct relay_viewer_stream *vstream)
2f8f53af	29	{
dc3bfa8d	30	lttng_trace_chunk_put(vstream->stream_file.trace_chunk);
7591bab1 MD	31	free(vstream->path_name);
	32	free(vstream->channel_name);
	33	free(vstream);
2f8f53af DG	34	}
2f8f53af DG	35
7591bab1	36	static void viewer_stream_destroy_rcu(struct rcu_head *head)
2f8f53af	37	{
7591bab1	38	struct relay_viewer_stream *vstream =
2f8f53af DG	39	caa_container_of(head, struct relay_viewer_stream, rcu_node);
2f8f53af DG	40
7591bab1	41	viewer_stream_destroy(vstream);
2f8f53af DG	42	}
	43
	44	struct relay_viewer_stream viewer_stream_create(struct relay_stream stream,
7591bab1	45	enum lttng_viewer_seek seek_t)
2f8f53af	46	{
ebb29c10 JG	47	struct relay_viewer_stream *vstream = NULL;
	48	const bool acquired_reference = lttng_trace_chunk_get(
	49	stream->trace_chunk);
	50
	51	if (!acquired_reference) {
	52	goto error;
	53	}
2f8f53af	54
2f8f53af DG	55	vstream = zmalloc(sizeof(*vstream));
	56	if (!vstream) {
	57	PERROR("relay viewer stream zmalloc");
	58	goto error;
	59	}
	60
ebb29c10	61	vstream->stream_file.trace_chunk = stream->trace_chunk;
f5436bfc	62	vstream->path_name = lttng_strndup(stream->path_name, LTTNG_VIEWER_PATH_MAX);
b272577e MD	63	if (vstream->path_name == NULL) {
	64	PERROR("relay viewer path_name alloc");
	65	goto error;
	66	}
f5436bfc	67	vstream->channel_name = lttng_strndup(stream->channel_name,
2f8f53af	68	LTTNG_VIEWER_NAME_MAX);
b272577e MD	69	if (vstream->channel_name == NULL) {
	70	PERROR("relay viewer channel_name alloc");
	71	goto error;
	72	}
2f8f53af	73
a44ca2ca MD	74	if (!stream_get(stream)) {
	75	ERR("Cannot get stream");
	76	goto error;
	77	}
	78	vstream->stream = stream;
	79
	80	pthread_mutex_lock(&stream->lock);
	81
	82	if (stream->is_metadata && stream->trace->viewer_metadata_stream) {
	83	ERR("Cannot attach viewer metadata stream to trace (busy).");
	84	goto error_unlock;
	85	}
	86
2f8f53af	87	switch (seek_t) {
c4e361a4	88	case LTTNG_VIEWER_SEEK_BEGINNING:
a44ca2ca MD	89	{
	90	uint64_t seq_tail = tracefile_array_get_seq_tail(stream->tfa);
	91
	92	if (seq_tail == -1ULL) {
	93	/*
	94	* Tail may not be initialized yet. Nonetheless, we know
	95	* we want to send the first index once it becomes
	96	* available.
	97	*/
	98	seq_tail = 0;
	99	}
	100	vstream->current_tracefile_id =
	101	tracefile_array_get_file_index_tail(stream->tfa);
	102	vstream->index_sent_seqcount = seq_tail;
2f8f53af	103	break;
a44ca2ca	104	}
c4e361a4	105	case LTTNG_VIEWER_SEEK_LAST:
a44ca2ca MD	106	vstream->current_tracefile_id =
	107	tracefile_array_get_file_index_head(stream->tfa);
	108	/*
	109	* We seek at the very end of each stream, awaiting for
	110	* a future packet to eventually come in.
	111	*
	112	* We don't need to check the head position for -1ULL since the
	113	* increment will set it to 0.
	114	*/
	115	vstream->index_sent_seqcount =
	116	tracefile_array_get_seq_head(stream->tfa) + 1;
2f8f53af DG	117	break;
2f8f53af DG	118	default:
a44ca2ca	119	goto error_unlock;
2f8f53af	120	}
2f8f53af	121
2f8f53af	122	/*
a44ca2ca MD	123	* If we never received an index for the current stream, delay
a44ca2ca MD	124	* the opening of the index, otherwise open it right now.
2f8f53af	125	*/
a44ca2ca	126	if (stream->index_received_seqcount == 0) {
f8f3885c	127	vstream->index_file = NULL;
2f8f53af	128	} else {
ebb29c10 JG	129	const uint32_t connection_major = stream->trace->session->major;
	130	const uint32_t connection_minor = stream->trace->session->minor;
	131
	132	vstream->index_file = lttng_index_file_create_from_trace_chunk_read_only(
	133	stream->trace_chunk, stream->path_name,
	134	stream->channel_name, stream->tracefile_size,
	135	vstream->current_tracefile_id,
	136	lttng_to_index_major(connection_major,
	137	connection_minor),
	138	lttng_to_index_minor(connection_major,
	139	connection_minor));
f8f3885c	140	if (!vstream->index_file) {
7591bab1	141	goto error_unlock;
2f8f53af	142	}
2f8f53af DG	143	}
2f8f53af DG	144
f8f3885c	145	if (seek_t == LTTNG_VIEWER_SEEK_LAST && vstream->index_file) {
2f8f53af DG	146	off_t lseek_ret;
2f8f53af DG	147
f8f3885c	148	lseek_ret = lseek(vstream->index_file->fd, 0, SEEK_END);
2f8f53af	149	if (lseek_ret < 0) {
7591bab1	150	goto error_unlock;
2f8f53af	151	}
7591bab1	152	}
7591bab1 MD	153	if (stream->is_metadata) {
	154	rcu_assign_pointer(stream->trace->viewer_metadata_stream,
	155	vstream);
2f8f53af	156	}
a44ca2ca	157	pthread_mutex_unlock(&stream->lock);
2f8f53af	158
7591bab1 MD	159	/* Globally visible after the add unique. */
	160	lttng_ht_node_init_u64(&vstream->stream_n, stream->stream_handle);
	161	lttng_ht_add_unique_u64(viewer_streams_ht, &vstream->stream_n);
	162
7591bab1 MD	163	urcu_ref_init(&vstream->ref);
7591bab1 MD	164
2f8f53af DG	165	return vstream;
2f8f53af DG	166
7591bab1 MD	167	error_unlock:
7591bab1 MD	168	pthread_mutex_unlock(&stream->lock);
2f8f53af DG	169	error:
2f8f53af DG	170	if (vstream) {
7591bab1	171	viewer_stream_destroy(vstream);
2f8f53af DG	172	}
	173	return NULL;
	174	}
	175
7591bab1	176	static void viewer_stream_unpublish(struct relay_viewer_stream *vstream)
2f8f53af DG	177	{
	178	int ret;
	179	struct lttng_ht_iter iter;
	180
7591bab1	181	iter.iter.node = &vstream->stream_n.node;
2f8f53af DG	182	ret = lttng_ht_del(viewer_streams_ht, &iter);
	183	assert(!ret);
	184	}
	185
7591bab1	186	static void viewer_stream_release(struct urcu_ref *ref)
2f8f53af	187	{
7591bab1 MD	188	struct relay_viewer_stream *vstream = caa_container_of(ref,
7591bab1 MD	189	struct relay_viewer_stream, ref);
2a174661	190
7591bab1 MD	191	if (vstream->stream->is_metadata) {
7591bab1 MD	192	rcu_assign_pointer(vstream->stream->trace->viewer_metadata_stream, NULL);
2a174661	193	}
2f8f53af	194
7591bab1 MD	195	viewer_stream_unpublish(vstream);
7591bab1 MD	196
ebb29c10 JG	197	if (vstream->stream_file.fd) {
	198	stream_fd_put(vstream->stream_file.fd);
	199	vstream->stream_file.fd = NULL;
2f8f53af	200	}
f8f3885c MD	201	if (vstream->index_file) {
	202	lttng_index_file_put(vstream->index_file);
	203	vstream->index_file = NULL;
7591bab1 MD	204	}
	205	if (vstream->stream) {
	206	stream_put(vstream->stream);
	207	vstream->stream = NULL;
	208	}
dc3bfa8d	209
7591bab1 MD	210	call_rcu(&vstream->rcu_node, viewer_stream_destroy_rcu);
	211	}
	212
	213	/* Must be called with RCU read-side lock held. */
	214	bool viewer_stream_get(struct relay_viewer_stream *vstream)
	215	{
ce4d4083	216	return urcu_ref_get_unless_zero(&vstream->ref);
2f8f53af DG	217	}
	218
	219	/*
7591bab1	220	* Get viewer stream by id.
2f8f53af	221	*
7591bab1	222	* Return viewer stream if found else NULL.
2f8f53af	223	*/
7591bab1	224	struct relay_viewer_stream *viewer_stream_get_by_id(uint64_t id)
2f8f53af DG	225	{
	226	struct lttng_ht_node_u64 *node;
	227	struct lttng_ht_iter iter;
7591bab1	228	struct relay_viewer_stream *vstream = NULL;
2f8f53af	229
7591bab1	230	rcu_read_lock();
2f8f53af DG	231	lttng_ht_lookup(viewer_streams_ht, &id, &iter);
	232	node = lttng_ht_iter_get_node_u64(&iter);
	233	if (!node) {
	234	DBG("Relay viewer stream %" PRIu64 " not found", id);
	235	goto end;
	236	}
7591bab1 MD	237	vstream = caa_container_of(node, struct relay_viewer_stream, stream_n);
	238	if (!viewer_stream_get(vstream)) {
	239	vstream = NULL;
	240	}
2f8f53af	241	end:
7591bab1 MD	242	rcu_read_unlock();
	243	return vstream;
	244	}
	245
	246	void viewer_stream_put(struct relay_viewer_stream *vstream)
	247	{
	248	rcu_read_lock();
7591bab1	249	urcu_ref_put(&vstream->ref, viewer_stream_release);
7591bab1 MD	250	rcu_read_unlock();
	251	}
	252
2f8f53af DG	253	/*
	254	* Rotate a stream to the next tracefile.
	255	*
7591bab1	256	* Must be called with the rstream lock held.
2f8f53af DG	257	* Returns 0 on success, 1 on EOF, a negative value on error.
2f8f53af DG	258	*/
7591bab1	259	int viewer_stream_rotate(struct relay_viewer_stream *vstream)
2f8f53af DG	260	{
2f8f53af DG	261	int ret;
a44ca2ca	262	uint64_t new_id;
ebb29c10 JG	263	const struct relay_stream *stream = vstream->stream;
	264	const uint32_t connection_major = stream->trace->session->major;
	265	const uint32_t connection_minor = stream->trace->session->minor;
2f8f53af	266
7591bab1	267	/* Detect the last tracefile to open. */
a44ca2ca MD	268	if (stream->index_received_seqcount
a44ca2ca MD	269	== vstream->index_sent_seqcount
7591bab1 MD	270	&& stream->trace->session->connection_closed) {
7591bab1 MD	271	ret = 1;
2a174661 DG	272	goto end;
2a174661 DG	273	}
2f8f53af	274
7591bab1 MD	275	if (stream->tracefile_count == 0) {
	276	/* Ignore rotation, there is none to do. */
	277	ret = 0;
2f8f53af DG	278	goto end;
	279	}
	280
a44ca2ca MD	281	/*
	282	* Try to move to the next file.
	283	*/
	284	new_id = (vstream->current_tracefile_id + 1)
	285	% stream->tracefile_count;
	286	if (tracefile_array_seq_in_file(stream->tfa, new_id,
	287	vstream->index_sent_seqcount)) {
	288	vstream->current_tracefile_id = new_id;
2f8f53af	289	} else {
a44ca2ca MD	290	uint64_t seq_tail = tracefile_array_get_seq_tail(stream->tfa);
	291
	292	/*
	293	* This can only be reached on overwrite, which implies there
	294	* has been data written at some point, which will have set the
	295	* tail.
	296	*/
	297	assert(seq_tail != -1ULL);
	298	/*
	299	* We need to resync because we lag behind tail.
	300	*/
7591bab1	301	vstream->current_tracefile_id =
a44ca2ca MD	302	tracefile_array_get_file_index_tail(stream->tfa);
a44ca2ca MD	303	vstream->index_sent_seqcount = seq_tail;
2f8f53af	304	}
2f8f53af	305
f8f3885c MD	306	if (vstream->index_file) {
	307	lttng_index_file_put(vstream->index_file);
	308	vstream->index_file = NULL;
2f8f53af	309	}
ebb29c10 JG	310	if (vstream->stream_file.fd) {
	311	stream_fd_put(vstream->stream_file.fd);
	312	vstream->stream_file.fd = NULL;
2f8f53af	313	}
ebb29c10 JG	314	vstream->index_file =
	315	lttng_index_file_create_from_trace_chunk_read_only(
	316	stream->trace_chunk, stream->path_name,
	317	stream->channel_name,
	318	stream->tracefile_size,
	319	vstream->current_tracefile_id,
	320	lttng_to_index_major(connection_major,
	321	connection_minor),
	322	lttng_to_index_minor(connection_major,
	323	connection_minor));
f8f3885c MD	324	if (!vstream->index_file) {
f8f3885c MD	325	ret = -1;
7591bab1	326	goto end;
7591bab1	327	} else {
f8f3885c	328	ret = 0;
2f8f53af	329	}
2f8f53af	330	end:
2f8f53af DG	331	return ret;
2f8f53af DG	332	}
7591bab1 MD	333
	334	void print_viewer_streams(void)
	335	{
	336	struct lttng_ht_iter iter;
	337	struct relay_viewer_stream *vstream;
	338
ce3f3ba3 JG	339	if (!viewer_streams_ht) {
	340	return;
	341	}
	342
7591bab1 MD	343	rcu_read_lock();
	344	cds_lfht_for_each_entry(viewer_streams_ht->ht, &iter.iter, vstream,
	345	stream_n.node) {
	346	if (!viewer_stream_get(vstream)) {
	347	continue;
	348	}
	349	DBG("vstream %p refcount %ld stream %" PRIu64 " trace %" PRIu64
	350	" session %" PRIu64,
	351	vstream,
	352	vstream->ref.refcount,
	353	vstream->stream->stream_handle,
	354	vstream->stream->trace->id,
	355	vstream->stream->trace->session->id);
	356	viewer_stream_put(vstream);
	357	}
	358	rcu_read_unlock();
	359	}