[lttng-tools.git] / src / bin / lttng-relayd / session.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/utils.h>
#include <common/compat/uuid.h>
#include <urcu/rculist.h>

#include "ctf-trace.h"
#include "lttng-relayd.h"
#include "session.h"
#include "sessiond-trace-chunks.h"
#include "stream.h"

/* Global session id used in the session creation. */
static uint64_t last_relay_session_id;
static pthread_mutex_t last_relay_session_id_lock = PTHREAD_MUTEX_INITIALIZER;

static int session_set_anonymous_chunk(struct relay_session *session)
{
	int ret = 0;
	struct lttng_trace_chunk *chunk = NULL;
	enum lttng_trace_chunk_status status;
	struct lttng_directory_handle output_directory;
	const char *base_path = opt_output_path;

	if (base_path == NULL) {
		/* No output path defined */
		base_path = utils_get_home_dir();
		if (base_path == NULL) {
			ERR("Home path not found.\n \
					Please specify an output path using -o, --output PATH");
			ret = -1;
			goto end;
		}
	}

	ret = lttng_directory_handle_init(&output_directory, base_path);
	if (ret) {
		goto end;
	}

	chunk = lttng_trace_chunk_create_anonymous();
	if (!chunk) {
		goto end;
	}

	status = lttng_trace_chunk_set_credentials_current_user(chunk);
	if (status != LTTNG_TRACE_CHUNK_STATUS_OK) {
		ret = -1;
		goto end;
	}

	status = lttng_trace_chunk_set_as_owner(chunk, &output_directory);
	if (status != LTTNG_TRACE_CHUNK_STATUS_OK) {
		ret = -1;
		goto end;
	}
	session->current_trace_chunk = chunk;
	chunk = NULL;
end:
	lttng_trace_chunk_put(chunk);
	lttng_directory_handle_fini(&output_directory);
	return ret;
}

/*
 * Create a new session by assigning a new session ID.
 *
 * Return allocated session or else NULL.
 */
struct relay_session *session_create(const char *session_name,
		const char *hostname,
		uint32_t live_timer,
		bool snapshot,
		const lttng_uuid sessiond_uuid,
		const uint64_t *id_sessiond,
		const uint64_t *current_chunk_id,
		const time_t *creation_time,
		uint32_t major,
		uint32_t minor)
{
	int ret;
	struct relay_session *session;

	session = zmalloc(sizeof(*session));
	if (!session) {
		PERROR("Failed to allocate session");
		goto error;
	}
	if (lttng_strncpy(session->session_name, session_name,
			sizeof(session->session_name))) {
	        WARN("Session name exceeds maximal allowed length");
		goto error;
	}
	if (lttng_strncpy(session->hostname, hostname,
			sizeof(session->hostname))) {
		WARN("Hostname exceeds maximal allowed length");
		goto error;
	}
	session->ctf_traces_ht = lttng_ht_new(0, LTTNG_HT_TYPE_STRING);
	if (!session->ctf_traces_ht) {
		goto error;
	}

	pthread_mutex_lock(&last_relay_session_id_lock);
	session->id = ++last_relay_session_id;
	pthread_mutex_unlock(&last_relay_session_id_lock);

	session->major = major;
	session->minor = minor;
	lttng_ht_node_init_u64(&session->session_n, session->id);
	urcu_ref_init(&session->ref);
	CDS_INIT_LIST_HEAD(&session->recv_list);
	pthread_mutex_init(&session->lock, NULL);
	pthread_mutex_init(&session->recv_list_lock, NULL);

	session->live_timer = live_timer;
	session->snapshot = snapshot;
	lttng_uuid_copy(session->sessiond_uuid, sessiond_uuid);

	if (id_sessiond) {
		LTTNG_OPTIONAL_SET(&session->id_sessiond, *id_sessiond);
	}

	ret = sessiond_trace_chunk_registry_session_created(
			sessiond_trace_chunk_registry, sessiond_uuid);
	if (ret) {
		goto error;
	}

	if (id_sessiond && current_chunk_id) {
		session->current_trace_chunk =
				sessiond_trace_chunk_registry_get_chunk(
					sessiond_trace_chunk_registry,
					session->sessiond_uuid,
					session->id_sessiond.value,
					*current_chunk_id);
		if (!session->current_trace_chunk) {
		        char uuid_str[UUID_STR_LEN];

			lttng_uuid_to_str(sessiond_uuid, uuid_str);
			ERR("Could not find trace chunk: sessiond = {%s}, sessiond session id = %" PRIu64 ", trace chunk id = %" PRIu64,
					uuid_str, *id_sessiond,
					*current_chunk_id);
                }
	} else if (!id_sessiond) {
		/*
		 * Pre-2.11 peers will not announce trace chunks. An
		 * anonymous trace chunk which will remain set for the
		 * duration of the session is created.
		 */
		ret = session_set_anonymous_chunk(session);
		if (ret) {
			goto error;
		}
	}

	lttng_ht_add_unique_u64(sessions_ht, &session->session_n);
	if (creation_time) {
		LTTNG_OPTIONAL_SET(&session->creation_time, *creation_time);
	}
	return session;

error:
	session_put(session);
	return NULL;
}

/* Should be called with RCU read-side lock held. */
bool session_get(struct relay_session *session)
{
	return urcu_ref_get_unless_zero(&session->ref);
}

/*
 * Lookup a session within the session hash table using the session id
 * as key. A session reference is taken when a session is returned.
 * session_put() must be called on that session.
 *
 * Return session or NULL if not found.
 */
struct relay_session *session_get_by_id(uint64_t id)
{
	struct relay_session *session = NULL;
	struct lttng_ht_node_u64 *node;
	struct lttng_ht_iter iter;

	rcu_read_lock();
	lttng_ht_lookup(sessions_ht, &id, &iter);
	node = lttng_ht_iter_get_node_u64(&iter);
	if (!node) {
		DBG("Session find by ID %" PRIu64 " id NOT found", id);
		goto end;
	}
	session = caa_container_of(node, struct relay_session, session_n);
	DBG("Session find by ID %" PRIu64 " id found", id);
	if (!session_get(session)) {
		session = NULL;
	}
end:
	rcu_read_unlock();
	return session;
}

static void rcu_destroy_session(struct rcu_head *rcu_head)
{
	struct relay_session *session =
			caa_container_of(rcu_head, struct relay_session,
				rcu_node);
	/*
	 * Since each trace has a reference on the session, it means
	 * that if we are at the point where we teardown the session, no
	 * trace belonging to that session exist at this point.
	 * Calling lttng_ht_destroy in call_rcu worker thread so we
	 * don't hold the RCU read-side lock while calling it.
	 */
	lttng_ht_destroy(session->ctf_traces_ht);
	free(session);
}

/*
 * Delete session from the given hash table.
 *
 * Return lttng ht del error code being 0 on success and 1 on failure.
 */
static int session_delete(struct relay_session *session)
{
	struct lttng_ht_iter iter;

	iter.iter.node = &session->session_n.node;
	return lttng_ht_del(sessions_ht, &iter);
}


static void destroy_session(struct relay_session *session)
{
	int ret;

	ret = session_delete(session);
	assert(!ret);
	lttng_trace_chunk_put(session->current_trace_chunk);
	session->current_trace_chunk = NULL;
	lttng_trace_chunk_put(session->pending_closure_trace_chunk);
	session->pending_closure_trace_chunk = NULL;
	ret = sessiond_trace_chunk_registry_session_destroyed(
			sessiond_trace_chunk_registry, session->sessiond_uuid);
	assert(!ret);
	call_rcu(&session->rcu_node, rcu_destroy_session);
}

void session_release(struct urcu_ref *ref)
{
	struct relay_session *session =
			caa_container_of(ref, struct relay_session, ref);

	destroy_session(session);
}

void session_put(struct relay_session *session)
{
	rcu_read_lock();
	urcu_ref_put(&session->ref, session_release);
	rcu_read_unlock();
}

int session_close(struct relay_session *session)
{
	int ret = 0;
	struct ctf_trace *trace;
	struct lttng_ht_iter iter;
	struct relay_stream *stream;

	pthread_mutex_lock(&session->lock);
	DBG("closing session %" PRIu64 ": is conn already closed %d",
			session->id, session->connection_closed);
	session->connection_closed = true;
	pthread_mutex_unlock(&session->lock);

	rcu_read_lock();
	cds_lfht_for_each_entry(session->ctf_traces_ht->ht,
			&iter.iter, trace, node.node) {
		ret = ctf_trace_close(trace);
		if (ret) {
			goto rcu_unlock;
		}
	}
	cds_list_for_each_entry_rcu(stream, &session->recv_list,
			recv_node) {
		/* Close streams which have not been published yet. */
		try_stream_close(stream);
	}
rcu_unlock:
	rcu_read_unlock();
	if (ret) {
		return ret;
	}
	/* Put self-reference from create. */
	session_put(session);
	return ret;
}

int session_abort(struct relay_session *session)
{
	int ret = 0;

	if (!session) {
		return 0;
	}

	pthread_mutex_lock(&session->lock);
	DBG("aborting session %" PRIu64, session->id);
	session->aborted = true;
	pthread_mutex_unlock(&session->lock);
	return ret;
}

void print_sessions(void)
{
	struct lttng_ht_iter iter;
	struct relay_session *session;

	if (!sessions_ht) {
		return;
	}

	rcu_read_lock();
	cds_lfht_for_each_entry(sessions_ht->ht, &iter.iter, session,
			session_n.node) {
		if (!session_get(session)) {
			continue;
		}
		DBG("session %p refcount %ld session %" PRIu64,
			session,
			session->ref.refcount,
			session->id);
		session_put(session);
	}
	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
2a174661	21	#include <common/common.h>
a620c891	22	#include <common/utils.h>
1e791a74	23	#include <common/compat/uuid.h>
7591bab1	24	#include <urcu/rculist.h>
2a174661 DG	25
2a174661 DG	26	#include "ctf-trace.h"
a620c891	27	#include "lttng-relayd.h"
2f8f53af	28	#include "session.h"
23c8ff50	29	#include "sessiond-trace-chunks.h"
a620c891	30	#include "stream.h"
2a174661 DG	31
	32	/* Global session id used in the session creation. */
	33	static uint64_t last_relay_session_id;
7591bab1	34	static pthread_mutex_t last_relay_session_id_lock = PTHREAD_MUTEX_INITIALIZER;
2a174661	35
1e791a74 JG	36	static int session_set_anonymous_chunk(struct relay_session *session)
	37	{
	38	int ret = 0;
	39	struct lttng_trace_chunk *chunk = NULL;
	40	enum lttng_trace_chunk_status status;
	41	struct lttng_directory_handle output_directory;
4f00620d	42	const char *base_path = opt_output_path;
a620c891 JR	43
	44	if (base_path == NULL) {
	45	/* No output path defined */
	46	base_path = utils_get_home_dir();
	47	if (base_path == NULL) {
	48	ERR("Home path not found.\n \
	49	Please specify an output path using -o, --output PATH");
	50	ret = -1;
	51	goto end;
	52	}
	53	}
1e791a74	54
a620c891	55	ret = lttng_directory_handle_init(&output_directory, base_path);
1e791a74 JG	56	if (ret) {
	57	goto end;
	58	}
	59
	60	chunk = lttng_trace_chunk_create_anonymous();
	61	if (!chunk) {
	62	goto end;
	63	}
	64
	65	status = lttng_trace_chunk_set_credentials_current_user(chunk);
	66	if (status != LTTNG_TRACE_CHUNK_STATUS_OK) {
	67	ret = -1;
	68	goto end;
	69	}
	70
	71	status = lttng_trace_chunk_set_as_owner(chunk, &output_directory);
	72	if (status != LTTNG_TRACE_CHUNK_STATUS_OK) {
	73	ret = -1;
	74	goto end;
	75	}
	76	session->current_trace_chunk = chunk;
	77	chunk = NULL;
	78	end:
	79	lttng_trace_chunk_put(chunk);
	80	lttng_directory_handle_fini(&output_directory);
	81	return ret;
	82	}
	83
2a174661 DG	84	/*
	85	* Create a new session by assigning a new session ID.
	86	*
	87	* Return allocated session or else NULL.
	88	*/
7591bab1	89	struct relay_session session_create(const char session_name,
db1da059 JG	90	const char *hostname,
	91	uint32_t live_timer,
	92	bool snapshot,
	93	const lttng_uuid sessiond_uuid,
	94	const uint64_t *id_sessiond,
	95	const uint64_t *current_chunk_id,
	96	const time_t *creation_time,
	97	uint32_t major,
	98	uint32_t minor)
2a174661	99	{
23c8ff50	100	int ret;
2a174661 DG	101	struct relay_session *session;
	102
	103	session = zmalloc(sizeof(*session));
	104	if (!session) {
1e791a74	105	PERROR("Failed to allocate session");
2a174661 DG	106	goto error;
2a174661 DG	107	}
bb5d54e7 MD	108	if (lttng_strncpy(session->session_name, session_name,
bb5d54e7 MD	109	sizeof(session->session_name))) {
1e791a74	110	WARN("Session name exceeds maximal allowed length");
bb5d54e7 MD	111	goto error;
	112	}
	113	if (lttng_strncpy(session->hostname, hostname,
	114	sizeof(session->hostname))) {
1e791a74	115	WARN("Hostname exceeds maximal allowed length");
bb5d54e7 MD	116	goto error;
bb5d54e7 MD	117	}
2a174661 DG	118	session->ctf_traces_ht = lttng_ht_new(0, LTTNG_HT_TYPE_STRING);
2a174661 DG	119	if (!session->ctf_traces_ht) {
2a174661 DG	120	goto error;
	121	}
	122
7591bab1	123	pthread_mutex_lock(&last_relay_session_id_lock);
2a174661	124	session->id = ++last_relay_session_id;
7591bab1 MD	125	pthread_mutex_unlock(&last_relay_session_id_lock);
	126
	127	session->major = major;
	128	session->minor = minor;
2a174661	129	lttng_ht_node_init_u64(&session->session_n, session->id);
7591bab1 MD	130	urcu_ref_init(&session->ref);
	131	CDS_INIT_LIST_HEAD(&session->recv_list);
	132	pthread_mutex_init(&session->lock, NULL);
7591bab1 MD	133	pthread_mutex_init(&session->recv_list_lock, NULL);
7591bab1 MD	134
7591bab1 MD	135	session->live_timer = live_timer;
7591bab1 MD	136	session->snapshot = snapshot;
23c8ff50 JG	137	lttng_uuid_copy(session->sessiond_uuid, sessiond_uuid);
23c8ff50 JG	138
1e791a74 JG	139	if (id_sessiond) {
	140	LTTNG_OPTIONAL_SET(&session->id_sessiond, *id_sessiond);
	141	}
	142
23c8ff50 JG	143	ret = sessiond_trace_chunk_registry_session_created(
	144	sessiond_trace_chunk_registry, sessiond_uuid);
	145	if (ret) {
	146	goto error;
	147	}
7591bab1	148
1e791a74 JG	149	if (id_sessiond && current_chunk_id) {
	150	session->current_trace_chunk =
	151	sessiond_trace_chunk_registry_get_chunk(
	152	sessiond_trace_chunk_registry,
	153	session->sessiond_uuid,
	154	session->id_sessiond.value,
	155	*current_chunk_id);
	156	if (!session->current_trace_chunk) {
	157	char uuid_str[UUID_STR_LEN];
	158
	159	lttng_uuid_to_str(sessiond_uuid, uuid_str);
	160	ERR("Could not find trace chunk: sessiond = {%s}, sessiond session id = %" PRIu64 ", trace chunk id = %" PRIu64,
	161	uuid_str, *id_sessiond,
	162	*current_chunk_id);
	163	}
	164	} else if (!id_sessiond) {
	165	/*
	166	* Pre-2.11 peers will not announce trace chunks. An
	167	* anonymous trace chunk which will remain set for the
	168	* duration of the session is created.
	169	*/
	170	ret = session_set_anonymous_chunk(session);
	171	if (ret) {
	172	goto error;
	173	}
	174	}
	175
7591bab1	176	lttng_ht_add_unique_u64(sessions_ht, &session->session_n);
db1da059 JG	177	if (creation_time) {
	178	LTTNG_OPTIONAL_SET(&session->creation_time, *creation_time);
	179	}
bb5d54e7	180	return session;
2a174661 DG	181
2a174661 DG	182	error:
1e791a74	183	session_put(session);
bb5d54e7	184	return NULL;
2a174661	185	}
2f8f53af	186
7591bab1 MD	187	/* Should be called with RCU read-side lock held. */
	188	bool session_get(struct relay_session *session)
	189	{
ce4d4083	190	return urcu_ref_get_unless_zero(&session->ref);
7591bab1 MD	191	}
7591bab1 MD	192
2f8f53af	193	/*
7591bab1 MD	194	* Lookup a session within the session hash table using the session id
	195	* as key. A session reference is taken when a session is returned.
	196	* session_put() must be called on that session.
2f8f53af DG	197	*
	198	* Return session or NULL if not found.
	199	*/
7591bab1	200	struct relay_session *session_get_by_id(uint64_t id)
2f8f53af DG	201	{
2f8f53af DG	202	struct relay_session *session = NULL;
2a174661	203	struct lttng_ht_node_u64 *node;
2f8f53af DG	204	struct lttng_ht_iter iter;
2f8f53af DG	205
7591bab1 MD	206	rcu_read_lock();
7591bab1 MD	207	lttng_ht_lookup(sessions_ht, &id, &iter);
2a174661	208	node = lttng_ht_iter_get_node_u64(&iter);
2f8f53af	209	if (!node) {
2a174661	210	DBG("Session find by ID %" PRIu64 " id NOT found", id);
2f8f53af DG	211	goto end;
	212	}
	213	session = caa_container_of(node, struct relay_session, session_n);
2a174661	214	DBG("Session find by ID %" PRIu64 " id found", id);
7591bab1 MD	215	if (!session_get(session)) {
	216	session = NULL;
	217	}
2f8f53af	218	end:
7591bab1	219	rcu_read_unlock();
2f8f53af DG	220	return session;
2f8f53af DG	221	}
2a174661	222
7591bab1 MD	223	static void rcu_destroy_session(struct rcu_head *rcu_head)
	224	{
	225	struct relay_session *session =
	226	caa_container_of(rcu_head, struct relay_session,
	227	rcu_node);
49e614cb MD	228	/*
	229	* Since each trace has a reference on the session, it means
	230	* that if we are at the point where we teardown the session, no
	231	* trace belonging to that session exist at this point.
	232	* Calling lttng_ht_destroy in call_rcu worker thread so we
	233	* don't hold the RCU read-side lock while calling it.
	234	*/
	235	lttng_ht_destroy(session->ctf_traces_ht);
7591bab1 MD	236	free(session);
	237	}
	238
2a174661 DG	239	/*
	240	* Delete session from the given hash table.
	241	*
	242	* Return lttng ht del error code being 0 on success and 1 on failure.
	243	*/
7591bab1	244	static int session_delete(struct relay_session *session)
2a174661 DG	245	{
	246	struct lttng_ht_iter iter;
	247
2a174661	248	iter.iter.node = &session->session_n.node;
7591bab1	249	return lttng_ht_del(sessions_ht, &iter);
2a174661 DG	250	}
2a174661 DG	251
7591bab1 MD	252
	253	static void destroy_session(struct relay_session *session)
	254	{
	255	int ret;
	256
	257	ret = session_delete(session);
	258	assert(!ret);
639ddf68	259	lttng_trace_chunk_put(session->current_trace_chunk);
c35f9726	260	session->current_trace_chunk = NULL;
62bad3bf JG	261	lttng_trace_chunk_put(session->pending_closure_trace_chunk);
62bad3bf JG	262	session->pending_closure_trace_chunk = NULL;
23c8ff50 JG	263	ret = sessiond_trace_chunk_registry_session_destroyed(
	264	sessiond_trace_chunk_registry, session->sessiond_uuid);
	265	assert(!ret);
7591bab1 MD	266	call_rcu(&session->rcu_node, rcu_destroy_session);
	267	}
	268
	269	void session_release(struct urcu_ref *ref)
2a174661	270	{
7591bab1 MD	271	struct relay_session *session =
7591bab1 MD	272	caa_container_of(ref, struct relay_session, ref);
2a174661	273
7591bab1 MD	274	destroy_session(session);
7591bab1 MD	275	}
2a174661	276
7591bab1 MD	277	void session_put(struct relay_session *session)
	278	{
	279	rcu_read_lock();
7591bab1	280	urcu_ref_put(&session->ref, session_release);
7591bab1	281	rcu_read_unlock();
2a174661 DG	282	}
2a174661 DG	283
7591bab1	284	int session_close(struct relay_session *session)
2a174661 DG	285	{
2a174661 DG	286	int ret = 0;
7591bab1 MD	287	struct ctf_trace *trace;
	288	struct lttng_ht_iter iter;
	289	struct relay_stream *stream;
	290
	291	pthread_mutex_lock(&session->lock);
	292	DBG("closing session %" PRIu64 ": is conn already closed %d",
	293	session->id, session->connection_closed);
7591bab1	294	session->connection_closed = true;
7591bab1	295	pthread_mutex_unlock(&session->lock);
2a174661	296
7591bab1 MD	297	rcu_read_lock();
	298	cds_lfht_for_each_entry(session->ctf_traces_ht->ht,
	299	&iter.iter, trace, node.node) {
	300	ret = ctf_trace_close(trace);
	301	if (ret) {
	302	goto rcu_unlock;
2a174661 DG	303	}
2a174661 DG	304	}
7591bab1 MD	305	cds_list_for_each_entry_rcu(stream, &session->recv_list,
7591bab1 MD	306	recv_node) {
bda7c7b9 JG	307	/* Close streams which have not been published yet. */
bda7c7b9 JG	308	try_stream_close(stream);
7591bab1 MD	309	}
	310	rcu_unlock:
	311	rcu_read_unlock();
	312	if (ret) {
	313	return ret;
	314	}
	315	/* Put self-reference from create. */
	316	session_put(session);
	317	return ret;
2a174661 DG	318	}
2a174661 DG	319
98ba050e JR	320	int session_abort(struct relay_session *session)
	321	{
	322	int ret = 0;
	323
	324	if (!session) {
	325	return 0;
	326	}
	327
	328	pthread_mutex_lock(&session->lock);
	329	DBG("aborting session %" PRIu64, session->id);
98ba050e	330	session->aborted = true;
98ba050e JR	331	pthread_mutex_unlock(&session->lock);
	332	return ret;
	333	}
	334
7591bab1	335	void print_sessions(void)
2a174661	336	{
2a174661	337	struct lttng_ht_iter iter;
7591bab1	338	struct relay_session *session;
2a174661	339
ce3f3ba3 JG	340	if (!sessions_ht) {
	341	return;
	342	}
	343
2a174661	344	rcu_read_lock();
7591bab1 MD	345	cds_lfht_for_each_entry(sessions_ht->ht, &iter.iter, session,
	346	session_n.node) {
	347	if (!session_get(session)) {
	348	continue;
	349	}
	350	DBG("session %p refcount %ld session %" PRIu64,
	351	session,
	352	session->ref.refcount,
	353	session->id);
	354	session_put(session);
2a174661	355	}
2a174661	356	rcu_read_unlock();
2a174661	357	}