03b9ed3ed8bfcdecb184efa81a088539f14284f6
2 * Copyright (C) 2013 - Julien Desfossez <jdesfossez@efficios.com>
3 * David Goulet <dgoulet@efficios.com>
4 * 2015 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
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.
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
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.
21 #include <common/common.h>
22 #include <common/utils.h>
23 #include <common/defaults.h>
24 #include <urcu/rculist.h>
27 #include "lttng-relayd.h"
30 #include "viewer-stream.h"
32 /* Should be called with RCU read-side lock held. */
33 bool stream_get(struct relay_stream
*stream
)
37 pthread_mutex_lock(&stream
->reflock
);
38 if (stream
->ref
.refcount
!= 0) {
40 urcu_ref_get(&stream
->ref
);
42 pthread_mutex_unlock(&stream
->reflock
);
48 * Get stream from stream id from the streams hash table. Return stream
49 * if found else NULL. A stream reference is taken when a stream is
50 * returned. stream_put() must be called on that stream.
52 struct relay_stream
*stream_get_by_id(uint64_t stream_id
)
54 struct lttng_ht_node_u64
*node
;
55 struct lttng_ht_iter iter
;
56 struct relay_stream
*stream
= NULL
;
59 lttng_ht_lookup(relay_streams_ht
, &stream_id
, &iter
);
60 node
= lttng_ht_iter_get_node_u64(&iter
);
62 DBG("Relay stream %" PRIu64
" not found", stream_id
);
65 stream
= caa_container_of(node
, struct relay_stream
, node
);
66 if (!stream_get(stream
)) {
75 * We keep ownership of path_name and channel_name.
77 struct relay_stream
*stream_create(struct ctf_trace
*trace
,
78 uint64_t stream_handle
, char *path_name
,
79 char *channel_name
, uint64_t tracefile_size
,
80 uint64_t tracefile_count
)
83 struct relay_stream
*stream
= NULL
;
84 struct relay_session
*session
= trace
->session
;
86 stream
= zmalloc(sizeof(struct relay_stream
));
88 PERROR("relay stream zmalloc");
93 stream
->stream_handle
= stream_handle
;
94 stream
->prev_seq
= -1ULL;
95 stream
->ctf_stream_id
= -1ULL;
96 stream
->tracefile_size
= tracefile_size
;
97 stream
->tracefile_count
= tracefile_count
;
98 stream
->path_name
= path_name
;
99 stream
->channel_name
= channel_name
;
100 lttng_ht_node_init_u64(&stream
->node
, stream
->stream_handle
);
101 pthread_mutex_init(&stream
->lock
, NULL
);
102 pthread_mutex_init(&stream
->reflock
, NULL
);
103 urcu_ref_init(&stream
->ref
);
104 ctf_trace_get(trace
);
105 stream
->trace
= trace
;
107 stream
->indexes_ht
= lttng_ht_new(0, LTTNG_HT_TYPE_U64
);
108 if (!stream
->indexes_ht
) {
109 ERR("Cannot created indexes_ht");
114 ret
= utils_mkdir_recursive(stream
->path_name
, S_IRWXU
| S_IRWXG
,
117 ERR("relay creating output directory");
122 * No need to use run_as API here because whatever we receive,
123 * the relayd uses its own credentials for the stream files.
125 ret
= utils_create_stream_file(stream
->path_name
, stream
->channel_name
,
126 stream
->tracefile_size
, 0, -1, -1, NULL
);
128 ERR("Create output file");
131 stream
->stream_fd
= stream_fd_create(ret
);
132 if (!stream
->stream_fd
) {
134 PERROR("Error closing file %d", ret
);
139 if (stream
->tracefile_size
) {
140 DBG("Tracefile %s/%s_0 created", stream
->path_name
, stream
->channel_name
);
142 DBG("Tracefile %s/%s created", stream
->path_name
, stream
->channel_name
);
145 if (!strncmp(stream
->channel_name
, DEFAULT_METADATA_NAME
, NAME_MAX
)) {
146 stream
->is_metadata
= 1;
149 stream
->in_recv_list
= true;
152 * Add the stream in the recv list of the session. Once the end stream
153 * message is received, all session streams are published.
155 pthread_mutex_lock(&session
->recv_list_lock
);
156 cds_list_add_rcu(&stream
->recv_node
, &session
->recv_list
);
157 session
->stream_count
++;
158 pthread_mutex_unlock(&session
->recv_list_lock
);
161 * Both in the ctf_trace object and the global stream ht since the data
162 * side of the relayd does not have the concept of session.
164 lttng_ht_add_unique_u64(relay_streams_ht
, &stream
->node
);
166 DBG("Relay new stream added %s with ID %" PRIu64
, stream
->channel_name
,
167 stream
->stream_handle
);
172 if (stream
->stream_fd
) {
173 stream_fd_put(stream
->stream_fd
);
174 stream
->stream_fd
= NULL
;
183 * path_name and channel_name need to be freed explicitly here
184 * because we cannot rely on stream_put().
192 * Called with the session lock held.
194 void stream_publish(struct relay_stream
*stream
)
196 struct relay_session
*session
;
198 pthread_mutex_lock(&stream
->lock
);
199 if (stream
->published
) {
203 session
= stream
->trace
->session
;
205 pthread_mutex_lock(&session
->recv_list_lock
);
206 if (stream
->in_recv_list
) {
207 cds_list_del_rcu(&stream
->recv_node
);
208 stream
->in_recv_list
= false;
210 pthread_mutex_unlock(&session
->recv_list_lock
);
212 pthread_mutex_lock(&stream
->trace
->stream_list_lock
);
213 cds_list_add_rcu(&stream
->stream_node
, &stream
->trace
->stream_list
);
214 pthread_mutex_unlock(&stream
->trace
->stream_list_lock
);
216 stream
->published
= true;
218 pthread_mutex_unlock(&stream
->lock
);
222 * Only called from destroy. No stream lock needed, since there is a
223 * single user at this point. This is ensured by having the refcount
226 static void stream_unpublish(struct relay_stream
*stream
)
228 if (!stream
->published
) {
231 pthread_mutex_lock(&stream
->trace
->stream_list_lock
);
232 cds_list_del_rcu(&stream
->stream_node
);
233 pthread_mutex_unlock(&stream
->trace
->stream_list_lock
);
235 stream
->published
= false;
238 static void stream_destroy(struct relay_stream
*stream
)
240 if (stream
->indexes_ht
) {
241 lttng_ht_destroy(stream
->indexes_ht
);
243 free(stream
->path_name
);
244 free(stream
->channel_name
);
248 static void stream_destroy_rcu(struct rcu_head
*rcu_head
)
250 struct relay_stream
*stream
=
251 caa_container_of(rcu_head
, struct relay_stream
, rcu_node
);
253 stream_destroy(stream
);
257 * No need to take stream->lock since this is only called on the final
258 * stream_put which ensures that a single thread may act on the stream.
260 * At that point, the object is also protected by the reflock which
261 * guarantees that no other thread may share ownership of this stream.
263 static void stream_release(struct urcu_ref
*ref
)
265 struct relay_stream
*stream
=
266 caa_container_of(ref
, struct relay_stream
, ref
);
267 struct relay_session
*session
;
269 struct lttng_ht_iter iter
;
271 session
= stream
->trace
->session
;
273 DBG("Releasing stream id %" PRIu64
, stream
->stream_handle
);
275 pthread_mutex_lock(&session
->recv_list_lock
);
276 session
->stream_count
--;
277 if (stream
->in_recv_list
) {
278 cds_list_del_rcu(&stream
->recv_node
);
279 stream
->in_recv_list
= false;
281 pthread_mutex_unlock(&session
->recv_list_lock
);
283 iter
.iter
.node
= &stream
->node
.node
;
284 ret
= lttng_ht_del(relay_streams_ht
, &iter
);
287 stream_unpublish(stream
);
289 if (stream
->stream_fd
) {
290 stream_fd_put(stream
->stream_fd
);
291 stream
->stream_fd
= NULL
;
293 if (stream
->index_fd
) {
294 stream_fd_put(stream
->index_fd
);
295 stream
->index_fd
= NULL
;
298 ctf_trace_put(stream
->trace
);
299 stream
->trace
= NULL
;
302 call_rcu(&stream
->rcu_node
, stream_destroy_rcu
);
305 void stream_put(struct relay_stream
*stream
)
307 DBG("stream put for stream id %" PRIu64
, stream
->stream_handle
);
309 * Ensure existence of stream->reflock for stream unlock.
313 * Stream reflock ensures that concurrent test and update of
314 * stream ref is atomic.
316 pthread_mutex_lock(&stream
->reflock
);
317 assert(stream
->ref
.refcount
!= 0);
319 * Wait until we have processed all the stream packets before
320 * actually putting our last stream reference.
322 DBG("stream put stream id %" PRIu64
" refcount %d",
323 stream
->stream_handle
,
324 (int) stream
->ref
.refcount
);
325 urcu_ref_put(&stream
->ref
, stream_release
);
326 pthread_mutex_unlock(&stream
->reflock
);
330 void stream_close(struct relay_stream
*stream
)
332 DBG("closing stream %" PRIu64
, stream
->stream_handle
);
333 pthread_mutex_lock(&stream
->lock
);
334 relay_index_close_all(stream
);
335 pthread_mutex_unlock(&stream
->lock
);
339 void print_relay_streams(void)
341 struct lttng_ht_iter iter
;
342 struct relay_stream
*stream
;
345 cds_lfht_for_each_entry(relay_streams_ht
->ht
, &iter
.iter
, stream
,
347 if (!stream_get(stream
)) {
350 DBG("stream %p refcount %ld stream %" PRIu64
" trace %" PRIu64
353 stream
->ref
.refcount
,
354 stream
->stream_handle
,
356 stream
->trace
->session
->id
);
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