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