af4ef1bbb80d9e17fe331298c4fac558d0795d3c
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.
22 #include <common/common.h>
23 #include <common/utils.h>
24 #include <common/defaults.h>
25 #include <urcu/rculist.h>
28 #include "lttng-relayd.h"
31 #include "viewer-stream.h"
33 /* Should be called with RCU read-side lock held. */
34 bool stream_get(struct relay_stream
*stream
)
38 pthread_mutex_lock(&stream
->reflock
);
39 if (stream
->ref
.refcount
!= 0) {
41 urcu_ref_get(&stream
->ref
);
43 pthread_mutex_unlock(&stream
->reflock
);
49 * Get stream from stream id from the streams hash table. Return stream
50 * if found else NULL. A stream reference is taken when a stream is
51 * returned. stream_put() must be called on that stream.
53 struct relay_stream
*stream_get_by_id(uint64_t stream_id
)
55 struct lttng_ht_node_u64
*node
;
56 struct lttng_ht_iter iter
;
57 struct relay_stream
*stream
= NULL
;
60 lttng_ht_lookup(relay_streams_ht
, &stream_id
, &iter
);
61 node
= lttng_ht_iter_get_node_u64(&iter
);
63 DBG("Relay stream %" PRIu64
" not found", stream_id
);
66 stream
= caa_container_of(node
, struct relay_stream
, node
);
67 if (!stream_get(stream
)) {
76 * We keep ownership of path_name and channel_name.
78 struct relay_stream
*stream_create(struct ctf_trace
*trace
,
79 uint64_t stream_handle
, char *path_name
,
80 char *channel_name
, uint64_t tracefile_size
,
81 uint64_t tracefile_count
)
84 struct relay_stream
*stream
= NULL
;
85 struct relay_session
*session
= trace
->session
;
87 stream
= zmalloc(sizeof(struct relay_stream
));
89 PERROR("relay stream zmalloc");
94 stream
->stream_handle
= stream_handle
;
95 stream
->prev_seq
= -1ULL;
96 stream
->ctf_stream_id
= -1ULL;
97 stream
->tracefile_size
= tracefile_size
;
98 stream
->tracefile_count
= tracefile_count
;
99 stream
->path_name
= path_name
;
100 stream
->channel_name
= channel_name
;
101 lttng_ht_node_init_u64(&stream
->node
, stream
->stream_handle
);
102 pthread_mutex_init(&stream
->lock
, NULL
);
103 pthread_mutex_init(&stream
->reflock
, NULL
);
104 urcu_ref_init(&stream
->ref
);
105 ctf_trace_get(trace
);
106 stream
->trace
= trace
;
108 stream
->indexes_ht
= lttng_ht_new(0, LTTNG_HT_TYPE_U64
);
109 if (!stream
->indexes_ht
) {
110 ERR("Cannot created indexes_ht");
115 ret
= utils_mkdir_recursive(stream
->path_name
, S_IRWXU
| S_IRWXG
,
118 ERR("relay creating output directory");
123 * No need to use run_as API here because whatever we receive,
124 * the relayd uses its own credentials for the stream files.
126 ret
= utils_create_stream_file(stream
->path_name
, stream
->channel_name
,
127 stream
->tracefile_size
, 0, -1, -1, NULL
);
129 ERR("Create output file");
132 stream
->stream_fd
= stream_fd_create(ret
);
133 if (!stream
->stream_fd
) {
135 PERROR("Error closing file %d", ret
);
140 if (stream
->tracefile_size
) {
141 DBG("Tracefile %s/%s_0 created", stream
->path_name
, stream
->channel_name
);
143 DBG("Tracefile %s/%s created", stream
->path_name
, stream
->channel_name
);
146 if (!strncmp(stream
->channel_name
, DEFAULT_METADATA_NAME
, NAME_MAX
)) {
147 stream
->is_metadata
= 1;
150 stream
->in_recv_list
= true;
153 * Add the stream in the recv list of the session. Once the end stream
154 * message is received, all session streams are published.
156 pthread_mutex_lock(&session
->recv_list_lock
);
157 cds_list_add_rcu(&stream
->recv_node
, &session
->recv_list
);
158 session
->stream_count
++;
159 pthread_mutex_unlock(&session
->recv_list_lock
);
162 * Both in the ctf_trace object and the global stream ht since the data
163 * side of the relayd does not have the concept of session.
165 lttng_ht_add_unique_u64(relay_streams_ht
, &stream
->node
);
167 DBG("Relay new stream added %s with ID %" PRIu64
, stream
->channel_name
,
168 stream
->stream_handle
);
173 if (stream
->stream_fd
) {
174 stream_fd_put(stream
->stream_fd
);
175 stream
->stream_fd
= NULL
;
184 * path_name and channel_name need to be freed explicitly here
185 * because we cannot rely on stream_put().
193 * Called with the session lock held.
195 void stream_publish(struct relay_stream
*stream
)
197 struct relay_session
*session
;
199 pthread_mutex_lock(&stream
->lock
);
200 if (stream
->published
) {
204 session
= stream
->trace
->session
;
206 pthread_mutex_lock(&session
->recv_list_lock
);
207 if (stream
->in_recv_list
) {
208 cds_list_del_rcu(&stream
->recv_node
);
209 stream
->in_recv_list
= false;
211 pthread_mutex_unlock(&session
->recv_list_lock
);
213 pthread_mutex_lock(&stream
->trace
->stream_list_lock
);
214 cds_list_add_rcu(&stream
->stream_node
, &stream
->trace
->stream_list
);
215 pthread_mutex_unlock(&stream
->trace
->stream_list_lock
);
217 stream
->published
= true;
219 pthread_mutex_unlock(&stream
->lock
);
223 * Only called from destroy. No stream lock needed, since there is a
224 * single user at this point. This is ensured by having the refcount
227 static void stream_unpublish(struct relay_stream
*stream
)
229 if (!stream
->published
) {
232 pthread_mutex_lock(&stream
->trace
->stream_list_lock
);
233 cds_list_del_rcu(&stream
->stream_node
);
234 pthread_mutex_unlock(&stream
->trace
->stream_list_lock
);
236 stream
->published
= false;
239 static void stream_destroy(struct relay_stream
*stream
)
241 if (stream
->indexes_ht
) {
242 lttng_ht_destroy(stream
->indexes_ht
);
244 free(stream
->path_name
);
245 free(stream
->channel_name
);
249 static void stream_destroy_rcu(struct rcu_head
*rcu_head
)
251 struct relay_stream
*stream
=
252 caa_container_of(rcu_head
, struct relay_stream
, rcu_node
);
254 stream_destroy(stream
);
258 * No need to take stream->lock since this is only called on the final
259 * stream_put which ensures that a single thread may act on the stream.
261 * At that point, the object is also protected by the reflock which
262 * guarantees that no other thread may share ownership of this stream.
264 static void stream_release(struct urcu_ref
*ref
)
266 struct relay_stream
*stream
=
267 caa_container_of(ref
, struct relay_stream
, ref
);
268 struct relay_session
*session
;
270 struct lttng_ht_iter iter
;
272 session
= stream
->trace
->session
;
274 DBG("Releasing stream id %" PRIu64
, stream
->stream_handle
);
276 pthread_mutex_lock(&session
->recv_list_lock
);
277 session
->stream_count
--;
278 if (stream
->in_recv_list
) {
279 cds_list_del_rcu(&stream
->recv_node
);
280 stream
->in_recv_list
= false;
282 pthread_mutex_unlock(&session
->recv_list_lock
);
284 iter
.iter
.node
= &stream
->node
.node
;
285 ret
= lttng_ht_del(relay_streams_ht
, &iter
);
288 stream_unpublish(stream
);
290 if (stream
->stream_fd
) {
291 stream_fd_put(stream
->stream_fd
);
292 stream
->stream_fd
= NULL
;
294 if (stream
->index_fd
) {
295 stream_fd_put(stream
->index_fd
);
296 stream
->index_fd
= NULL
;
299 ctf_trace_put(stream
->trace
);
300 stream
->trace
= NULL
;
303 call_rcu(&stream
->rcu_node
, stream_destroy_rcu
);
306 void stream_put(struct relay_stream
*stream
)
308 DBG("stream put for stream id %" PRIu64
, stream
->stream_handle
);
310 * Ensure existence of stream->reflock for stream unlock.
314 * Stream reflock ensures that concurrent test and update of
315 * stream ref is atomic.
317 pthread_mutex_lock(&stream
->reflock
);
318 assert(stream
->ref
.refcount
!= 0);
320 * Wait until we have processed all the stream packets before
321 * actually putting our last stream reference.
323 DBG("stream put stream id %" PRIu64
" refcount %d",
324 stream
->stream_handle
,
325 (int) stream
->ref
.refcount
);
326 urcu_ref_put(&stream
->ref
, stream_release
);
327 pthread_mutex_unlock(&stream
->reflock
);
331 void stream_close(struct relay_stream
*stream
)
333 DBG("closing stream %" PRIu64
, stream
->stream_handle
);
334 pthread_mutex_lock(&stream
->lock
);
335 relay_index_close_all(stream
);
336 pthread_mutex_unlock(&stream
->lock
);
340 void print_relay_streams(void)
342 struct lttng_ht_iter iter
;
343 struct relay_stream
*stream
;
346 cds_lfht_for_each_entry(relay_streams_ht
->ht
, &iter
.iter
, stream
,
348 if (!stream_get(stream
)) {
351 DBG("stream %p refcount %ld stream %" PRIu64
" trace %" PRIu64
354 stream
->ref
.refcount
,
355 stream
->stream_handle
,
357 stream
->trace
->session
->id
);
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