Commit | Line | Data |
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3bd1e081 MD |
1 | /* |
2 | * Copyright (C) 2011 - Julien Desfossez <julien.desfossez@polymtl.ca> | |
3 | * Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
00e2e675 | 4 | * 2012 - David Goulet <dgoulet@efficios.com> |
3bd1e081 | 5 | * |
d14d33bf AM |
6 | * This program is free software; you can redistribute it and/or modify |
7 | * it under the terms of the GNU General Public License, version 2 only, | |
8 | * as published by the Free Software Foundation. | |
3bd1e081 | 9 | * |
d14d33bf AM |
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. | |
3bd1e081 | 14 | * |
d14d33bf AM |
15 | * You should have received a copy of the GNU General Public License along |
16 | * with this program; if not, write to the Free Software Foundation, Inc., | |
17 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
3bd1e081 MD |
18 | */ |
19 | ||
6c1c0768 | 20 | #define _LGPL_SOURCE |
3bd1e081 | 21 | #include <assert.h> |
3bd1e081 MD |
22 | #include <poll.h> |
23 | #include <pthread.h> | |
24 | #include <stdlib.h> | |
25 | #include <string.h> | |
26 | #include <sys/mman.h> | |
27 | #include <sys/socket.h> | |
28 | #include <sys/types.h> | |
29 | #include <unistd.h> | |
77c7c900 | 30 | #include <inttypes.h> |
331744e3 | 31 | #include <signal.h> |
3bd1e081 | 32 | |
51a9e1c7 | 33 | #include <bin/lttng-consumerd/health-consumerd.h> |
990570ed | 34 | #include <common/common.h> |
fb3a43a9 DG |
35 | #include <common/utils.h> |
36 | #include <common/compat/poll.h> | |
f263b7fd | 37 | #include <common/compat/endian.h> |
309167d2 | 38 | #include <common/index/index.h> |
10a8a223 | 39 | #include <common/kernel-ctl/kernel-ctl.h> |
00e2e675 | 40 | #include <common/sessiond-comm/relayd.h> |
10a8a223 DG |
41 | #include <common/sessiond-comm/sessiond-comm.h> |
42 | #include <common/kernel-consumer/kernel-consumer.h> | |
00e2e675 | 43 | #include <common/relayd/relayd.h> |
10a8a223 | 44 | #include <common/ust-consumer/ust-consumer.h> |
c8fea79c JR |
45 | #include <common/consumer/consumer-timer.h> |
46 | #include <common/consumer/consumer.h> | |
47 | #include <common/consumer/consumer-stream.h> | |
48 | #include <common/consumer/consumer-testpoint.h> | |
49 | #include <common/align.h> | |
5feafd41 | 50 | #include <common/consumer/consumer-metadata-cache.h> |
3bd1e081 MD |
51 | |
52 | struct lttng_consumer_global_data consumer_data = { | |
3bd1e081 MD |
53 | .stream_count = 0, |
54 | .need_update = 1, | |
55 | .type = LTTNG_CONSUMER_UNKNOWN, | |
56 | }; | |
57 | ||
d8ef542d MD |
58 | enum consumer_channel_action { |
59 | CONSUMER_CHANNEL_ADD, | |
a0cbdd2e | 60 | CONSUMER_CHANNEL_DEL, |
d8ef542d MD |
61 | CONSUMER_CHANNEL_QUIT, |
62 | }; | |
63 | ||
64 | struct consumer_channel_msg { | |
65 | enum consumer_channel_action action; | |
a0cbdd2e MD |
66 | struct lttng_consumer_channel *chan; /* add */ |
67 | uint64_t key; /* del */ | |
d8ef542d MD |
68 | }; |
69 | ||
80957876 | 70 | /* Flag used to temporarily pause data consumption from testpoints. */ |
cf0bcb51 JG |
71 | int data_consumption_paused; |
72 | ||
3bd1e081 MD |
73 | /* |
74 | * Flag to inform the polling thread to quit when all fd hung up. Updated by | |
75 | * the consumer_thread_receive_fds when it notices that all fds has hung up. | |
76 | * Also updated by the signal handler (consumer_should_exit()). Read by the | |
77 | * polling threads. | |
78 | */ | |
10211f5c | 79 | int consumer_quit; |
3bd1e081 | 80 | |
43c34bc3 | 81 | /* |
43c34bc3 DG |
82 | * Global hash table containing respectively metadata and data streams. The |
83 | * stream element in this ht should only be updated by the metadata poll thread | |
84 | * for the metadata and the data poll thread for the data. | |
85 | */ | |
40dc48e0 DG |
86 | static struct lttng_ht *metadata_ht; |
87 | static struct lttng_ht *data_ht; | |
43c34bc3 | 88 | |
acdb9057 DG |
89 | /* |
90 | * Notify a thread lttng pipe to poll back again. This usually means that some | |
91 | * global state has changed so we just send back the thread in a poll wait | |
92 | * call. | |
93 | */ | |
94 | static void notify_thread_lttng_pipe(struct lttng_pipe *pipe) | |
95 | { | |
96 | struct lttng_consumer_stream *null_stream = NULL; | |
97 | ||
98 | assert(pipe); | |
99 | ||
100 | (void) lttng_pipe_write(pipe, &null_stream, sizeof(null_stream)); | |
101 | } | |
102 | ||
5c635c72 MD |
103 | static void notify_health_quit_pipe(int *pipe) |
104 | { | |
6cd525e8 | 105 | ssize_t ret; |
5c635c72 | 106 | |
6cd525e8 MD |
107 | ret = lttng_write(pipe[1], "4", 1); |
108 | if (ret < 1) { | |
5c635c72 MD |
109 | PERROR("write consumer health quit"); |
110 | } | |
111 | } | |
112 | ||
d8ef542d MD |
113 | static void notify_channel_pipe(struct lttng_consumer_local_data *ctx, |
114 | struct lttng_consumer_channel *chan, | |
a0cbdd2e | 115 | uint64_t key, |
d8ef542d MD |
116 | enum consumer_channel_action action) |
117 | { | |
118 | struct consumer_channel_msg msg; | |
6cd525e8 | 119 | ssize_t ret; |
d8ef542d | 120 | |
e56251fc DG |
121 | memset(&msg, 0, sizeof(msg)); |
122 | ||
d8ef542d MD |
123 | msg.action = action; |
124 | msg.chan = chan; | |
f21dae48 | 125 | msg.key = key; |
6cd525e8 MD |
126 | ret = lttng_write(ctx->consumer_channel_pipe[1], &msg, sizeof(msg)); |
127 | if (ret < sizeof(msg)) { | |
128 | PERROR("notify_channel_pipe write error"); | |
129 | } | |
d8ef542d MD |
130 | } |
131 | ||
a0cbdd2e MD |
132 | void notify_thread_del_channel(struct lttng_consumer_local_data *ctx, |
133 | uint64_t key) | |
134 | { | |
135 | notify_channel_pipe(ctx, NULL, key, CONSUMER_CHANNEL_DEL); | |
136 | } | |
137 | ||
d8ef542d MD |
138 | static int read_channel_pipe(struct lttng_consumer_local_data *ctx, |
139 | struct lttng_consumer_channel **chan, | |
a0cbdd2e | 140 | uint64_t *key, |
d8ef542d MD |
141 | enum consumer_channel_action *action) |
142 | { | |
143 | struct consumer_channel_msg msg; | |
6cd525e8 | 144 | ssize_t ret; |
d8ef542d | 145 | |
6cd525e8 MD |
146 | ret = lttng_read(ctx->consumer_channel_pipe[0], &msg, sizeof(msg)); |
147 | if (ret < sizeof(msg)) { | |
148 | ret = -1; | |
149 | goto error; | |
d8ef542d | 150 | } |
6cd525e8 MD |
151 | *action = msg.action; |
152 | *chan = msg.chan; | |
153 | *key = msg.key; | |
154 | error: | |
155 | return (int) ret; | |
d8ef542d MD |
156 | } |
157 | ||
212d67a2 DG |
158 | /* |
159 | * Cleanup the stream list of a channel. Those streams are not yet globally | |
160 | * visible | |
161 | */ | |
162 | static void clean_channel_stream_list(struct lttng_consumer_channel *channel) | |
163 | { | |
164 | struct lttng_consumer_stream *stream, *stmp; | |
165 | ||
166 | assert(channel); | |
167 | ||
168 | /* Delete streams that might have been left in the stream list. */ | |
169 | cds_list_for_each_entry_safe(stream, stmp, &channel->streams.head, | |
170 | send_node) { | |
171 | cds_list_del(&stream->send_node); | |
172 | /* | |
173 | * Once a stream is added to this list, the buffers were created so we | |
174 | * have a guarantee that this call will succeed. Setting the monitor | |
175 | * mode to 0 so we don't lock nor try to delete the stream from the | |
176 | * global hash table. | |
177 | */ | |
178 | stream->monitor = 0; | |
179 | consumer_stream_destroy(stream, NULL); | |
180 | } | |
181 | } | |
182 | ||
3bd1e081 MD |
183 | /* |
184 | * Find a stream. The consumer_data.lock must be locked during this | |
185 | * call. | |
186 | */ | |
d88aee68 | 187 | static struct lttng_consumer_stream *find_stream(uint64_t key, |
8389e4f8 | 188 | struct lttng_ht *ht) |
3bd1e081 | 189 | { |
e4421fec | 190 | struct lttng_ht_iter iter; |
d88aee68 | 191 | struct lttng_ht_node_u64 *node; |
e4421fec | 192 | struct lttng_consumer_stream *stream = NULL; |
3bd1e081 | 193 | |
8389e4f8 DG |
194 | assert(ht); |
195 | ||
d88aee68 DG |
196 | /* -1ULL keys are lookup failures */ |
197 | if (key == (uint64_t) -1ULL) { | |
7ad0a0cb | 198 | return NULL; |
7a57cf92 | 199 | } |
e4421fec | 200 | |
6065ceec DG |
201 | rcu_read_lock(); |
202 | ||
d88aee68 DG |
203 | lttng_ht_lookup(ht, &key, &iter); |
204 | node = lttng_ht_iter_get_node_u64(&iter); | |
e4421fec DG |
205 | if (node != NULL) { |
206 | stream = caa_container_of(node, struct lttng_consumer_stream, node); | |
3bd1e081 | 207 | } |
e4421fec | 208 | |
6065ceec DG |
209 | rcu_read_unlock(); |
210 | ||
e4421fec | 211 | return stream; |
3bd1e081 MD |
212 | } |
213 | ||
da009f2c | 214 | static void steal_stream_key(uint64_t key, struct lttng_ht *ht) |
7ad0a0cb MD |
215 | { |
216 | struct lttng_consumer_stream *stream; | |
217 | ||
04253271 | 218 | rcu_read_lock(); |
ffe60014 | 219 | stream = find_stream(key, ht); |
04253271 | 220 | if (stream) { |
da009f2c | 221 | stream->key = (uint64_t) -1ULL; |
04253271 MD |
222 | /* |
223 | * We don't want the lookup to match, but we still need | |
224 | * to iterate on this stream when iterating over the hash table. Just | |
225 | * change the node key. | |
226 | */ | |
da009f2c | 227 | stream->node.key = (uint64_t) -1ULL; |
04253271 MD |
228 | } |
229 | rcu_read_unlock(); | |
7ad0a0cb MD |
230 | } |
231 | ||
d56db448 DG |
232 | /* |
233 | * Return a channel object for the given key. | |
234 | * | |
235 | * RCU read side lock MUST be acquired before calling this function and | |
236 | * protects the channel ptr. | |
237 | */ | |
d88aee68 | 238 | struct lttng_consumer_channel *consumer_find_channel(uint64_t key) |
3bd1e081 | 239 | { |
e4421fec | 240 | struct lttng_ht_iter iter; |
d88aee68 | 241 | struct lttng_ht_node_u64 *node; |
e4421fec | 242 | struct lttng_consumer_channel *channel = NULL; |
3bd1e081 | 243 | |
d88aee68 DG |
244 | /* -1ULL keys are lookup failures */ |
245 | if (key == (uint64_t) -1ULL) { | |
7ad0a0cb | 246 | return NULL; |
7a57cf92 | 247 | } |
e4421fec | 248 | |
d88aee68 DG |
249 | lttng_ht_lookup(consumer_data.channel_ht, &key, &iter); |
250 | node = lttng_ht_iter_get_node_u64(&iter); | |
e4421fec DG |
251 | if (node != NULL) { |
252 | channel = caa_container_of(node, struct lttng_consumer_channel, node); | |
3bd1e081 | 253 | } |
e4421fec DG |
254 | |
255 | return channel; | |
3bd1e081 MD |
256 | } |
257 | ||
b5a6470f DG |
258 | /* |
259 | * There is a possibility that the consumer does not have enough time between | |
260 | * the close of the channel on the session daemon and the cleanup in here thus | |
261 | * once we have a channel add with an existing key, we know for sure that this | |
262 | * channel will eventually get cleaned up by all streams being closed. | |
263 | * | |
264 | * This function just nullifies the already existing channel key. | |
265 | */ | |
266 | static void steal_channel_key(uint64_t key) | |
267 | { | |
268 | struct lttng_consumer_channel *channel; | |
269 | ||
270 | rcu_read_lock(); | |
271 | channel = consumer_find_channel(key); | |
272 | if (channel) { | |
273 | channel->key = (uint64_t) -1ULL; | |
274 | /* | |
275 | * We don't want the lookup to match, but we still need to iterate on | |
276 | * this channel when iterating over the hash table. Just change the | |
277 | * node key. | |
278 | */ | |
279 | channel->node.key = (uint64_t) -1ULL; | |
280 | } | |
281 | rcu_read_unlock(); | |
282 | } | |
283 | ||
ffe60014 | 284 | static void free_channel_rcu(struct rcu_head *head) |
702b1ea4 | 285 | { |
d88aee68 DG |
286 | struct lttng_ht_node_u64 *node = |
287 | caa_container_of(head, struct lttng_ht_node_u64, head); | |
ffe60014 DG |
288 | struct lttng_consumer_channel *channel = |
289 | caa_container_of(node, struct lttng_consumer_channel, node); | |
702b1ea4 | 290 | |
b83e03c4 MD |
291 | switch (consumer_data.type) { |
292 | case LTTNG_CONSUMER_KERNEL: | |
293 | break; | |
294 | case LTTNG_CONSUMER32_UST: | |
295 | case LTTNG_CONSUMER64_UST: | |
296 | lttng_ustconsumer_free_channel(channel); | |
297 | break; | |
298 | default: | |
299 | ERR("Unknown consumer_data type"); | |
300 | abort(); | |
301 | } | |
ffe60014 | 302 | free(channel); |
702b1ea4 MD |
303 | } |
304 | ||
00e2e675 DG |
305 | /* |
306 | * RCU protected relayd socket pair free. | |
307 | */ | |
ffe60014 | 308 | static void free_relayd_rcu(struct rcu_head *head) |
00e2e675 | 309 | { |
d88aee68 DG |
310 | struct lttng_ht_node_u64 *node = |
311 | caa_container_of(head, struct lttng_ht_node_u64, head); | |
00e2e675 DG |
312 | struct consumer_relayd_sock_pair *relayd = |
313 | caa_container_of(node, struct consumer_relayd_sock_pair, node); | |
314 | ||
8994307f DG |
315 | /* |
316 | * Close all sockets. This is done in the call RCU since we don't want the | |
317 | * socket fds to be reassigned thus potentially creating bad state of the | |
318 | * relayd object. | |
319 | * | |
320 | * We do not have to lock the control socket mutex here since at this stage | |
321 | * there is no one referencing to this relayd object. | |
322 | */ | |
323 | (void) relayd_close(&relayd->control_sock); | |
324 | (void) relayd_close(&relayd->data_sock); | |
325 | ||
00e2e675 DG |
326 | free(relayd); |
327 | } | |
328 | ||
329 | /* | |
330 | * Destroy and free relayd socket pair object. | |
00e2e675 | 331 | */ |
51230d70 | 332 | void consumer_destroy_relayd(struct consumer_relayd_sock_pair *relayd) |
00e2e675 DG |
333 | { |
334 | int ret; | |
335 | struct lttng_ht_iter iter; | |
336 | ||
173af62f DG |
337 | if (relayd == NULL) { |
338 | return; | |
339 | } | |
340 | ||
00e2e675 DG |
341 | DBG("Consumer destroy and close relayd socket pair"); |
342 | ||
343 | iter.iter.node = &relayd->node.node; | |
344 | ret = lttng_ht_del(consumer_data.relayd_ht, &iter); | |
173af62f | 345 | if (ret != 0) { |
8994307f | 346 | /* We assume the relayd is being or is destroyed */ |
173af62f DG |
347 | return; |
348 | } | |
00e2e675 | 349 | |
00e2e675 | 350 | /* RCU free() call */ |
ffe60014 DG |
351 | call_rcu(&relayd->node.head, free_relayd_rcu); |
352 | } | |
353 | ||
354 | /* | |
355 | * Remove a channel from the global list protected by a mutex. This function is | |
356 | * also responsible for freeing its data structures. | |
357 | */ | |
358 | void consumer_del_channel(struct lttng_consumer_channel *channel) | |
359 | { | |
360 | int ret; | |
361 | struct lttng_ht_iter iter; | |
362 | ||
d88aee68 | 363 | DBG("Consumer delete channel key %" PRIu64, channel->key); |
ffe60014 DG |
364 | |
365 | pthread_mutex_lock(&consumer_data.lock); | |
a9838785 | 366 | pthread_mutex_lock(&channel->lock); |
ffe60014 | 367 | |
212d67a2 DG |
368 | /* Destroy streams that might have been left in the stream list. */ |
369 | clean_channel_stream_list(channel); | |
51e762e5 | 370 | |
d3e2ba59 JD |
371 | if (channel->live_timer_enabled == 1) { |
372 | consumer_timer_live_stop(channel); | |
373 | } | |
e9404c27 JG |
374 | if (channel->monitor_timer_enabled == 1) { |
375 | consumer_timer_monitor_stop(channel); | |
376 | } | |
d3e2ba59 | 377 | |
ffe60014 DG |
378 | switch (consumer_data.type) { |
379 | case LTTNG_CONSUMER_KERNEL: | |
380 | break; | |
381 | case LTTNG_CONSUMER32_UST: | |
382 | case LTTNG_CONSUMER64_UST: | |
383 | lttng_ustconsumer_del_channel(channel); | |
384 | break; | |
385 | default: | |
386 | ERR("Unknown consumer_data type"); | |
387 | assert(0); | |
388 | goto end; | |
389 | } | |
390 | ||
391 | rcu_read_lock(); | |
392 | iter.iter.node = &channel->node.node; | |
393 | ret = lttng_ht_del(consumer_data.channel_ht, &iter); | |
394 | assert(!ret); | |
395 | rcu_read_unlock(); | |
396 | ||
397 | call_rcu(&channel->node.head, free_channel_rcu); | |
398 | end: | |
a9838785 | 399 | pthread_mutex_unlock(&channel->lock); |
ffe60014 | 400 | pthread_mutex_unlock(&consumer_data.lock); |
00e2e675 DG |
401 | } |
402 | ||
228b5bf7 DG |
403 | /* |
404 | * Iterate over the relayd hash table and destroy each element. Finally, | |
405 | * destroy the whole hash table. | |
406 | */ | |
407 | static void cleanup_relayd_ht(void) | |
408 | { | |
409 | struct lttng_ht_iter iter; | |
410 | struct consumer_relayd_sock_pair *relayd; | |
411 | ||
412 | rcu_read_lock(); | |
413 | ||
414 | cds_lfht_for_each_entry(consumer_data.relayd_ht->ht, &iter.iter, relayd, | |
415 | node.node) { | |
51230d70 | 416 | consumer_destroy_relayd(relayd); |
228b5bf7 DG |
417 | } |
418 | ||
228b5bf7 | 419 | rcu_read_unlock(); |
36b588ed MD |
420 | |
421 | lttng_ht_destroy(consumer_data.relayd_ht); | |
228b5bf7 DG |
422 | } |
423 | ||
8994307f DG |
424 | /* |
425 | * Update the end point status of all streams having the given network sequence | |
426 | * index (relayd index). | |
427 | * | |
428 | * It's atomically set without having the stream mutex locked which is fine | |
429 | * because we handle the write/read race with a pipe wakeup for each thread. | |
430 | */ | |
da009f2c | 431 | static void update_endpoint_status_by_netidx(uint64_t net_seq_idx, |
8994307f DG |
432 | enum consumer_endpoint_status status) |
433 | { | |
434 | struct lttng_ht_iter iter; | |
435 | struct lttng_consumer_stream *stream; | |
436 | ||
da009f2c | 437 | DBG("Consumer set delete flag on stream by idx %" PRIu64, net_seq_idx); |
8994307f DG |
438 | |
439 | rcu_read_lock(); | |
440 | ||
441 | /* Let's begin with metadata */ | |
442 | cds_lfht_for_each_entry(metadata_ht->ht, &iter.iter, stream, node.node) { | |
443 | if (stream->net_seq_idx == net_seq_idx) { | |
444 | uatomic_set(&stream->endpoint_status, status); | |
445 | DBG("Delete flag set to metadata stream %d", stream->wait_fd); | |
446 | } | |
447 | } | |
448 | ||
449 | /* Follow up by the data streams */ | |
450 | cds_lfht_for_each_entry(data_ht->ht, &iter.iter, stream, node.node) { | |
451 | if (stream->net_seq_idx == net_seq_idx) { | |
452 | uatomic_set(&stream->endpoint_status, status); | |
453 | DBG("Delete flag set to data stream %d", stream->wait_fd); | |
454 | } | |
455 | } | |
456 | rcu_read_unlock(); | |
457 | } | |
458 | ||
459 | /* | |
460 | * Cleanup a relayd object by flagging every associated streams for deletion, | |
461 | * destroying the object meaning removing it from the relayd hash table, | |
462 | * closing the sockets and freeing the memory in a RCU call. | |
463 | * | |
464 | * If a local data context is available, notify the threads that the streams' | |
465 | * state have changed. | |
466 | */ | |
467 | static void cleanup_relayd(struct consumer_relayd_sock_pair *relayd, | |
468 | struct lttng_consumer_local_data *ctx) | |
469 | { | |
da009f2c | 470 | uint64_t netidx; |
8994307f DG |
471 | |
472 | assert(relayd); | |
473 | ||
9617607b DG |
474 | DBG("Cleaning up relayd sockets"); |
475 | ||
8994307f DG |
476 | /* Save the net sequence index before destroying the object */ |
477 | netidx = relayd->net_seq_idx; | |
478 | ||
479 | /* | |
480 | * Delete the relayd from the relayd hash table, close the sockets and free | |
481 | * the object in a RCU call. | |
482 | */ | |
51230d70 | 483 | consumer_destroy_relayd(relayd); |
8994307f DG |
484 | |
485 | /* Set inactive endpoint to all streams */ | |
486 | update_endpoint_status_by_netidx(netidx, CONSUMER_ENDPOINT_INACTIVE); | |
487 | ||
488 | /* | |
489 | * With a local data context, notify the threads that the streams' state | |
490 | * have changed. The write() action on the pipe acts as an "implicit" | |
491 | * memory barrier ordering the updates of the end point status from the | |
492 | * read of this status which happens AFTER receiving this notify. | |
493 | */ | |
494 | if (ctx) { | |
acdb9057 | 495 | notify_thread_lttng_pipe(ctx->consumer_data_pipe); |
13886d2d | 496 | notify_thread_lttng_pipe(ctx->consumer_metadata_pipe); |
8994307f DG |
497 | } |
498 | } | |
499 | ||
a6ba4fe1 DG |
500 | /* |
501 | * Flag a relayd socket pair for destruction. Destroy it if the refcount | |
502 | * reaches zero. | |
503 | * | |
504 | * RCU read side lock MUST be aquired before calling this function. | |
505 | */ | |
506 | void consumer_flag_relayd_for_destroy(struct consumer_relayd_sock_pair *relayd) | |
507 | { | |
508 | assert(relayd); | |
509 | ||
510 | /* Set destroy flag for this object */ | |
511 | uatomic_set(&relayd->destroy_flag, 1); | |
512 | ||
513 | /* Destroy the relayd if refcount is 0 */ | |
514 | if (uatomic_read(&relayd->refcount) == 0) { | |
51230d70 | 515 | consumer_destroy_relayd(relayd); |
a6ba4fe1 DG |
516 | } |
517 | } | |
518 | ||
3bd1e081 | 519 | /* |
1d1a276c DG |
520 | * Completly destroy stream from every visiable data structure and the given |
521 | * hash table if one. | |
522 | * | |
523 | * One this call returns, the stream object is not longer usable nor visible. | |
3bd1e081 | 524 | */ |
e316aad5 DG |
525 | void consumer_del_stream(struct lttng_consumer_stream *stream, |
526 | struct lttng_ht *ht) | |
3bd1e081 | 527 | { |
1d1a276c | 528 | consumer_stream_destroy(stream, ht); |
3bd1e081 MD |
529 | } |
530 | ||
5ab66908 MD |
531 | /* |
532 | * XXX naming of del vs destroy is all mixed up. | |
533 | */ | |
534 | void consumer_del_stream_for_data(struct lttng_consumer_stream *stream) | |
535 | { | |
536 | consumer_stream_destroy(stream, data_ht); | |
537 | } | |
538 | ||
539 | void consumer_del_stream_for_metadata(struct lttng_consumer_stream *stream) | |
540 | { | |
541 | consumer_stream_destroy(stream, metadata_ht); | |
542 | } | |
543 | ||
d9a2e16e JD |
544 | void consumer_stream_update_channel_attributes( |
545 | struct lttng_consumer_stream *stream, | |
546 | struct lttng_consumer_channel *channel) | |
547 | { | |
548 | stream->channel_read_only_attributes.tracefile_size = | |
549 | channel->tracefile_size; | |
550 | memcpy(stream->channel_read_only_attributes.path, channel->pathname, | |
551 | sizeof(stream->channel_read_only_attributes.path)); | |
552 | } | |
553 | ||
d88aee68 DG |
554 | struct lttng_consumer_stream *consumer_allocate_stream(uint64_t channel_key, |
555 | uint64_t stream_key, | |
3bd1e081 | 556 | enum lttng_consumer_stream_state state, |
ffe60014 | 557 | const char *channel_name, |
6df2e2c9 | 558 | uid_t uid, |
00e2e675 | 559 | gid_t gid, |
57a269f2 | 560 | uint64_t relayd_id, |
53632229 | 561 | uint64_t session_id, |
ffe60014 DG |
562 | int cpu, |
563 | int *alloc_ret, | |
4891ece8 | 564 | enum consumer_channel_type type, |
e098433c JG |
565 | unsigned int monitor, |
566 | uint64_t trace_archive_id) | |
3bd1e081 | 567 | { |
ffe60014 | 568 | int ret; |
3bd1e081 | 569 | struct lttng_consumer_stream *stream; |
3bd1e081 | 570 | |
effcf122 | 571 | stream = zmalloc(sizeof(*stream)); |
3bd1e081 | 572 | if (stream == NULL) { |
7a57cf92 | 573 | PERROR("malloc struct lttng_consumer_stream"); |
ffe60014 | 574 | ret = -ENOMEM; |
7a57cf92 | 575 | goto end; |
3bd1e081 | 576 | } |
7a57cf92 | 577 | |
d56db448 DG |
578 | rcu_read_lock(); |
579 | ||
3bd1e081 | 580 | stream->key = stream_key; |
3bd1e081 MD |
581 | stream->out_fd = -1; |
582 | stream->out_fd_offset = 0; | |
e5d1a9b3 | 583 | stream->output_written = 0; |
3bd1e081 | 584 | stream->state = state; |
6df2e2c9 MD |
585 | stream->uid = uid; |
586 | stream->gid = gid; | |
ffe60014 | 587 | stream->net_seq_idx = relayd_id; |
53632229 | 588 | stream->session_id = session_id; |
4891ece8 | 589 | stream->monitor = monitor; |
774d490c | 590 | stream->endpoint_status = CONSUMER_ENDPOINT_ACTIVE; |
f8f3885c | 591 | stream->index_file = NULL; |
fb83fe64 | 592 | stream->last_sequence_number = -1ULL; |
e098433c | 593 | stream->trace_archive_id = trace_archive_id; |
53632229 | 594 | pthread_mutex_init(&stream->lock, NULL); |
c585821b | 595 | pthread_mutex_init(&stream->metadata_timer_lock, NULL); |
58b1f425 | 596 | |
ffe60014 DG |
597 | /* If channel is the metadata, flag this stream as metadata. */ |
598 | if (type == CONSUMER_CHANNEL_TYPE_METADATA) { | |
599 | stream->metadata_flag = 1; | |
600 | /* Metadata is flat out. */ | |
601 | strncpy(stream->name, DEFAULT_METADATA_NAME, sizeof(stream->name)); | |
94d49140 JD |
602 | /* Live rendez-vous point. */ |
603 | pthread_cond_init(&stream->metadata_rdv, NULL); | |
604 | pthread_mutex_init(&stream->metadata_rdv_lock, NULL); | |
58b1f425 | 605 | } else { |
ffe60014 DG |
606 | /* Format stream name to <channel_name>_<cpu_number> */ |
607 | ret = snprintf(stream->name, sizeof(stream->name), "%s_%d", | |
608 | channel_name, cpu); | |
609 | if (ret < 0) { | |
610 | PERROR("snprintf stream name"); | |
611 | goto error; | |
612 | } | |
58b1f425 | 613 | } |
c30aaa51 | 614 | |
ffe60014 | 615 | /* Key is always the wait_fd for streams. */ |
d88aee68 | 616 | lttng_ht_node_init_u64(&stream->node, stream->key); |
ffe60014 | 617 | |
d8ef542d MD |
618 | /* Init node per channel id key */ |
619 | lttng_ht_node_init_u64(&stream->node_channel_id, channel_key); | |
620 | ||
53632229 | 621 | /* Init session id node with the stream session id */ |
d88aee68 | 622 | lttng_ht_node_init_u64(&stream->node_session_id, stream->session_id); |
53632229 | 623 | |
07b86b52 JD |
624 | DBG3("Allocated stream %s (key %" PRIu64 ", chan_key %" PRIu64 |
625 | " relayd_id %" PRIu64 ", session_id %" PRIu64, | |
626 | stream->name, stream->key, channel_key, | |
627 | stream->net_seq_idx, stream->session_id); | |
d56db448 DG |
628 | |
629 | rcu_read_unlock(); | |
3bd1e081 | 630 | return stream; |
c80048c6 MD |
631 | |
632 | error: | |
d56db448 | 633 | rcu_read_unlock(); |
c80048c6 | 634 | free(stream); |
7a57cf92 | 635 | end: |
ffe60014 DG |
636 | if (alloc_ret) { |
637 | *alloc_ret = ret; | |
638 | } | |
c80048c6 | 639 | return NULL; |
3bd1e081 MD |
640 | } |
641 | ||
642 | /* | |
643 | * Add a stream to the global list protected by a mutex. | |
644 | */ | |
66d583dc | 645 | void consumer_add_data_stream(struct lttng_consumer_stream *stream) |
3bd1e081 | 646 | { |
5ab66908 | 647 | struct lttng_ht *ht = data_ht; |
3bd1e081 | 648 | |
e316aad5 | 649 | assert(stream); |
43c34bc3 | 650 | assert(ht); |
c77fc10a | 651 | |
d88aee68 | 652 | DBG3("Adding consumer stream %" PRIu64, stream->key); |
e316aad5 DG |
653 | |
654 | pthread_mutex_lock(&consumer_data.lock); | |
a9838785 | 655 | pthread_mutex_lock(&stream->chan->lock); |
ec6ea7d0 | 656 | pthread_mutex_lock(&stream->chan->timer_lock); |
2e818a6a | 657 | pthread_mutex_lock(&stream->lock); |
b0b335c8 | 658 | rcu_read_lock(); |
e316aad5 | 659 | |
43c34bc3 | 660 | /* Steal stream identifier to avoid having streams with the same key */ |
ffe60014 | 661 | steal_stream_key(stream->key, ht); |
43c34bc3 | 662 | |
d88aee68 | 663 | lttng_ht_add_unique_u64(ht, &stream->node); |
00e2e675 | 664 | |
d8ef542d MD |
665 | lttng_ht_add_u64(consumer_data.stream_per_chan_id_ht, |
666 | &stream->node_channel_id); | |
667 | ||
ca22feea DG |
668 | /* |
669 | * Add stream to the stream_list_ht of the consumer data. No need to steal | |
670 | * the key since the HT does not use it and we allow to add redundant keys | |
671 | * into this table. | |
672 | */ | |
d88aee68 | 673 | lttng_ht_add_u64(consumer_data.stream_list_ht, &stream->node_session_id); |
ca22feea | 674 | |
e316aad5 | 675 | /* |
ffe60014 DG |
676 | * When nb_init_stream_left reaches 0, we don't need to trigger any action |
677 | * in terms of destroying the associated channel, because the action that | |
e316aad5 DG |
678 | * causes the count to become 0 also causes a stream to be added. The |
679 | * channel deletion will thus be triggered by the following removal of this | |
680 | * stream. | |
681 | */ | |
ffe60014 | 682 | if (uatomic_read(&stream->chan->nb_init_stream_left) > 0) { |
f2ad556d MD |
683 | /* Increment refcount before decrementing nb_init_stream_left */ |
684 | cmm_smp_wmb(); | |
ffe60014 | 685 | uatomic_dec(&stream->chan->nb_init_stream_left); |
e316aad5 DG |
686 | } |
687 | ||
688 | /* Update consumer data once the node is inserted. */ | |
3bd1e081 MD |
689 | consumer_data.stream_count++; |
690 | consumer_data.need_update = 1; | |
691 | ||
e316aad5 | 692 | rcu_read_unlock(); |
2e818a6a | 693 | pthread_mutex_unlock(&stream->lock); |
ec6ea7d0 | 694 | pthread_mutex_unlock(&stream->chan->timer_lock); |
a9838785 | 695 | pthread_mutex_unlock(&stream->chan->lock); |
3bd1e081 | 696 | pthread_mutex_unlock(&consumer_data.lock); |
3bd1e081 MD |
697 | } |
698 | ||
5ab66908 MD |
699 | void consumer_del_data_stream(struct lttng_consumer_stream *stream) |
700 | { | |
701 | consumer_del_stream(stream, data_ht); | |
702 | } | |
703 | ||
00e2e675 | 704 | /* |
3f8e211f DG |
705 | * Add relayd socket to global consumer data hashtable. RCU read side lock MUST |
706 | * be acquired before calling this. | |
00e2e675 | 707 | */ |
d09e1200 | 708 | static int add_relayd(struct consumer_relayd_sock_pair *relayd) |
00e2e675 DG |
709 | { |
710 | int ret = 0; | |
d88aee68 | 711 | struct lttng_ht_node_u64 *node; |
00e2e675 DG |
712 | struct lttng_ht_iter iter; |
713 | ||
ffe60014 | 714 | assert(relayd); |
00e2e675 | 715 | |
00e2e675 | 716 | lttng_ht_lookup(consumer_data.relayd_ht, |
d88aee68 DG |
717 | &relayd->net_seq_idx, &iter); |
718 | node = lttng_ht_iter_get_node_u64(&iter); | |
00e2e675 | 719 | if (node != NULL) { |
00e2e675 DG |
720 | goto end; |
721 | } | |
d88aee68 | 722 | lttng_ht_add_unique_u64(consumer_data.relayd_ht, &relayd->node); |
00e2e675 | 723 | |
00e2e675 DG |
724 | end: |
725 | return ret; | |
726 | } | |
727 | ||
728 | /* | |
729 | * Allocate and return a consumer relayd socket. | |
730 | */ | |
027a694f | 731 | static struct consumer_relayd_sock_pair *consumer_allocate_relayd_sock_pair( |
da009f2c | 732 | uint64_t net_seq_idx) |
00e2e675 DG |
733 | { |
734 | struct consumer_relayd_sock_pair *obj = NULL; | |
735 | ||
da009f2c MD |
736 | /* net sequence index of -1 is a failure */ |
737 | if (net_seq_idx == (uint64_t) -1ULL) { | |
00e2e675 DG |
738 | goto error; |
739 | } | |
740 | ||
741 | obj = zmalloc(sizeof(struct consumer_relayd_sock_pair)); | |
742 | if (obj == NULL) { | |
743 | PERROR("zmalloc relayd sock"); | |
744 | goto error; | |
745 | } | |
746 | ||
747 | obj->net_seq_idx = net_seq_idx; | |
748 | obj->refcount = 0; | |
173af62f | 749 | obj->destroy_flag = 0; |
f96e4545 MD |
750 | obj->control_sock.sock.fd = -1; |
751 | obj->data_sock.sock.fd = -1; | |
d88aee68 | 752 | lttng_ht_node_init_u64(&obj->node, obj->net_seq_idx); |
00e2e675 DG |
753 | pthread_mutex_init(&obj->ctrl_sock_mutex, NULL); |
754 | ||
755 | error: | |
756 | return obj; | |
757 | } | |
758 | ||
759 | /* | |
760 | * Find a relayd socket pair in the global consumer data. | |
761 | * | |
762 | * Return the object if found else NULL. | |
b0b335c8 MD |
763 | * RCU read-side lock must be held across this call and while using the |
764 | * returned object. | |
00e2e675 | 765 | */ |
d88aee68 | 766 | struct consumer_relayd_sock_pair *consumer_find_relayd(uint64_t key) |
00e2e675 DG |
767 | { |
768 | struct lttng_ht_iter iter; | |
d88aee68 | 769 | struct lttng_ht_node_u64 *node; |
00e2e675 DG |
770 | struct consumer_relayd_sock_pair *relayd = NULL; |
771 | ||
772 | /* Negative keys are lookup failures */ | |
d88aee68 | 773 | if (key == (uint64_t) -1ULL) { |
00e2e675 DG |
774 | goto error; |
775 | } | |
776 | ||
d88aee68 | 777 | lttng_ht_lookup(consumer_data.relayd_ht, &key, |
00e2e675 | 778 | &iter); |
d88aee68 | 779 | node = lttng_ht_iter_get_node_u64(&iter); |
00e2e675 DG |
780 | if (node != NULL) { |
781 | relayd = caa_container_of(node, struct consumer_relayd_sock_pair, node); | |
782 | } | |
783 | ||
00e2e675 DG |
784 | error: |
785 | return relayd; | |
786 | } | |
787 | ||
10a50311 JD |
788 | /* |
789 | * Find a relayd and send the stream | |
790 | * | |
791 | * Returns 0 on success, < 0 on error | |
792 | */ | |
793 | int consumer_send_relayd_stream(struct lttng_consumer_stream *stream, | |
794 | char *path) | |
795 | { | |
796 | int ret = 0; | |
797 | struct consumer_relayd_sock_pair *relayd; | |
798 | ||
799 | assert(stream); | |
800 | assert(stream->net_seq_idx != -1ULL); | |
801 | assert(path); | |
802 | ||
803 | /* The stream is not metadata. Get relayd reference if exists. */ | |
804 | rcu_read_lock(); | |
805 | relayd = consumer_find_relayd(stream->net_seq_idx); | |
806 | if (relayd != NULL) { | |
807 | /* Add stream on the relayd */ | |
808 | pthread_mutex_lock(&relayd->ctrl_sock_mutex); | |
809 | ret = relayd_add_stream(&relayd->control_sock, stream->name, | |
810 | path, &stream->relayd_stream_id, | |
811 | stream->chan->tracefile_size, stream->chan->tracefile_count); | |
812 | pthread_mutex_unlock(&relayd->ctrl_sock_mutex); | |
813 | if (ret < 0) { | |
814 | goto end; | |
815 | } | |
1c20f0e2 | 816 | |
10a50311 | 817 | uatomic_inc(&relayd->refcount); |
d01178b6 | 818 | stream->sent_to_relayd = 1; |
10a50311 JD |
819 | } else { |
820 | ERR("Stream %" PRIu64 " relayd ID %" PRIu64 " unknown. Can't send it.", | |
821 | stream->key, stream->net_seq_idx); | |
822 | ret = -1; | |
823 | goto end; | |
824 | } | |
825 | ||
826 | DBG("Stream %s with key %" PRIu64 " sent to relayd id %" PRIu64, | |
827 | stream->name, stream->key, stream->net_seq_idx); | |
828 | ||
829 | end: | |
830 | rcu_read_unlock(); | |
831 | return ret; | |
832 | } | |
833 | ||
a4baae1b JD |
834 | /* |
835 | * Find a relayd and send the streams sent message | |
836 | * | |
837 | * Returns 0 on success, < 0 on error | |
838 | */ | |
839 | int consumer_send_relayd_streams_sent(uint64_t net_seq_idx) | |
840 | { | |
841 | int ret = 0; | |
842 | struct consumer_relayd_sock_pair *relayd; | |
843 | ||
844 | assert(net_seq_idx != -1ULL); | |
845 | ||
846 | /* The stream is not metadata. Get relayd reference if exists. */ | |
847 | rcu_read_lock(); | |
848 | relayd = consumer_find_relayd(net_seq_idx); | |
849 | if (relayd != NULL) { | |
850 | /* Add stream on the relayd */ | |
851 | pthread_mutex_lock(&relayd->ctrl_sock_mutex); | |
852 | ret = relayd_streams_sent(&relayd->control_sock); | |
853 | pthread_mutex_unlock(&relayd->ctrl_sock_mutex); | |
854 | if (ret < 0) { | |
855 | goto end; | |
856 | } | |
857 | } else { | |
858 | ERR("Relayd ID %" PRIu64 " unknown. Can't send streams_sent.", | |
859 | net_seq_idx); | |
860 | ret = -1; | |
861 | goto end; | |
862 | } | |
863 | ||
864 | ret = 0; | |
865 | DBG("All streams sent relayd id %" PRIu64, net_seq_idx); | |
866 | ||
867 | end: | |
868 | rcu_read_unlock(); | |
869 | return ret; | |
870 | } | |
871 | ||
10a50311 JD |
872 | /* |
873 | * Find a relayd and close the stream | |
874 | */ | |
875 | void close_relayd_stream(struct lttng_consumer_stream *stream) | |
876 | { | |
877 | struct consumer_relayd_sock_pair *relayd; | |
878 | ||
879 | /* The stream is not metadata. Get relayd reference if exists. */ | |
880 | rcu_read_lock(); | |
881 | relayd = consumer_find_relayd(stream->net_seq_idx); | |
882 | if (relayd) { | |
883 | consumer_stream_relayd_close(stream, relayd); | |
884 | } | |
885 | rcu_read_unlock(); | |
886 | } | |
887 | ||
00e2e675 DG |
888 | /* |
889 | * Handle stream for relayd transmission if the stream applies for network | |
890 | * streaming where the net sequence index is set. | |
891 | * | |
892 | * Return destination file descriptor or negative value on error. | |
893 | */ | |
6197aea7 | 894 | static int write_relayd_stream_header(struct lttng_consumer_stream *stream, |
1d4dfdef DG |
895 | size_t data_size, unsigned long padding, |
896 | struct consumer_relayd_sock_pair *relayd) | |
00e2e675 DG |
897 | { |
898 | int outfd = -1, ret; | |
00e2e675 DG |
899 | struct lttcomm_relayd_data_hdr data_hdr; |
900 | ||
901 | /* Safety net */ | |
902 | assert(stream); | |
6197aea7 | 903 | assert(relayd); |
00e2e675 DG |
904 | |
905 | /* Reset data header */ | |
906 | memset(&data_hdr, 0, sizeof(data_hdr)); | |
907 | ||
00e2e675 DG |
908 | if (stream->metadata_flag) { |
909 | /* Caller MUST acquire the relayd control socket lock */ | |
910 | ret = relayd_send_metadata(&relayd->control_sock, data_size); | |
911 | if (ret < 0) { | |
912 | goto error; | |
913 | } | |
914 | ||
915 | /* Metadata are always sent on the control socket. */ | |
6151a90f | 916 | outfd = relayd->control_sock.sock.fd; |
00e2e675 DG |
917 | } else { |
918 | /* Set header with stream information */ | |
919 | data_hdr.stream_id = htobe64(stream->relayd_stream_id); | |
920 | data_hdr.data_size = htobe32(data_size); | |
1d4dfdef | 921 | data_hdr.padding_size = htobe32(padding); |
39df6d9f DG |
922 | /* |
923 | * Note that net_seq_num below is assigned with the *current* value of | |
924 | * next_net_seq_num and only after that the next_net_seq_num will be | |
925 | * increment. This is why when issuing a command on the relayd using | |
926 | * this next value, 1 should always be substracted in order to compare | |
927 | * the last seen sequence number on the relayd side to the last sent. | |
928 | */ | |
3604f373 | 929 | data_hdr.net_seq_num = htobe64(stream->next_net_seq_num); |
00e2e675 DG |
930 | /* Other fields are zeroed previously */ |
931 | ||
932 | ret = relayd_send_data_hdr(&relayd->data_sock, &data_hdr, | |
933 | sizeof(data_hdr)); | |
934 | if (ret < 0) { | |
935 | goto error; | |
936 | } | |
937 | ||
3604f373 DG |
938 | ++stream->next_net_seq_num; |
939 | ||
00e2e675 | 940 | /* Set to go on data socket */ |
6151a90f | 941 | outfd = relayd->data_sock.sock.fd; |
00e2e675 DG |
942 | } |
943 | ||
944 | error: | |
945 | return outfd; | |
946 | } | |
947 | ||
3bd1e081 | 948 | /* |
ffe60014 DG |
949 | * Allocate and return a new lttng_consumer_channel object using the given key |
950 | * to initialize the hash table node. | |
951 | * | |
952 | * On error, return NULL. | |
3bd1e081 | 953 | */ |
886224ff | 954 | struct lttng_consumer_channel *consumer_allocate_channel(uint64_t key, |
ffe60014 DG |
955 | uint64_t session_id, |
956 | const char *pathname, | |
957 | const char *name, | |
958 | uid_t uid, | |
959 | gid_t gid, | |
57a269f2 | 960 | uint64_t relayd_id, |
1624d5b7 JD |
961 | enum lttng_event_output output, |
962 | uint64_t tracefile_size, | |
2bba9e53 | 963 | uint64_t tracefile_count, |
1950109e | 964 | uint64_t session_id_per_pid, |
ecc48a90 | 965 | unsigned int monitor, |
d7ba1388 | 966 | unsigned int live_timer_interval, |
3d071855 | 967 | const char *root_shm_path, |
d7ba1388 | 968 | const char *shm_path) |
3bd1e081 MD |
969 | { |
970 | struct lttng_consumer_channel *channel; | |
3bd1e081 | 971 | |
276b26d1 | 972 | channel = zmalloc(sizeof(*channel)); |
3bd1e081 | 973 | if (channel == NULL) { |
7a57cf92 | 974 | PERROR("malloc struct lttng_consumer_channel"); |
3bd1e081 MD |
975 | goto end; |
976 | } | |
ffe60014 DG |
977 | |
978 | channel->key = key; | |
3bd1e081 | 979 | channel->refcount = 0; |
ffe60014 | 980 | channel->session_id = session_id; |
1950109e | 981 | channel->session_id_per_pid = session_id_per_pid; |
ffe60014 DG |
982 | channel->uid = uid; |
983 | channel->gid = gid; | |
984 | channel->relayd_id = relayd_id; | |
1624d5b7 JD |
985 | channel->tracefile_size = tracefile_size; |
986 | channel->tracefile_count = tracefile_count; | |
2bba9e53 | 987 | channel->monitor = monitor; |
ecc48a90 | 988 | channel->live_timer_interval = live_timer_interval; |
a9838785 | 989 | pthread_mutex_init(&channel->lock, NULL); |
ec6ea7d0 | 990 | pthread_mutex_init(&channel->timer_lock, NULL); |
ffe60014 | 991 | |
0c759fc9 DG |
992 | switch (output) { |
993 | case LTTNG_EVENT_SPLICE: | |
994 | channel->output = CONSUMER_CHANNEL_SPLICE; | |
995 | break; | |
996 | case LTTNG_EVENT_MMAP: | |
997 | channel->output = CONSUMER_CHANNEL_MMAP; | |
998 | break; | |
999 | default: | |
1000 | assert(0); | |
1001 | free(channel); | |
1002 | channel = NULL; | |
1003 | goto end; | |
1004 | } | |
1005 | ||
07b86b52 JD |
1006 | /* |
1007 | * In monitor mode, the streams associated with the channel will be put in | |
1008 | * a special list ONLY owned by this channel. So, the refcount is set to 1 | |
1009 | * here meaning that the channel itself has streams that are referenced. | |
1010 | * | |
1011 | * On a channel deletion, once the channel is no longer visible, the | |
1012 | * refcount is decremented and checked for a zero value to delete it. With | |
1013 | * streams in no monitor mode, it will now be safe to destroy the channel. | |
1014 | */ | |
1015 | if (!channel->monitor) { | |
1016 | channel->refcount = 1; | |
1017 | } | |
1018 | ||
ffe60014 DG |
1019 | strncpy(channel->pathname, pathname, sizeof(channel->pathname)); |
1020 | channel->pathname[sizeof(channel->pathname) - 1] = '\0'; | |
1021 | ||
1022 | strncpy(channel->name, name, sizeof(channel->name)); | |
1023 | channel->name[sizeof(channel->name) - 1] = '\0'; | |
1024 | ||
3d071855 MD |
1025 | if (root_shm_path) { |
1026 | strncpy(channel->root_shm_path, root_shm_path, sizeof(channel->root_shm_path)); | |
1027 | channel->root_shm_path[sizeof(channel->root_shm_path) - 1] = '\0'; | |
1028 | } | |
d7ba1388 MD |
1029 | if (shm_path) { |
1030 | strncpy(channel->shm_path, shm_path, sizeof(channel->shm_path)); | |
1031 | channel->shm_path[sizeof(channel->shm_path) - 1] = '\0'; | |
1032 | } | |
1033 | ||
d88aee68 | 1034 | lttng_ht_node_init_u64(&channel->node, channel->key); |
d8ef542d MD |
1035 | |
1036 | channel->wait_fd = -1; | |
1037 | ||
ffe60014 DG |
1038 | CDS_INIT_LIST_HEAD(&channel->streams.head); |
1039 | ||
62a7b8ed | 1040 | DBG("Allocated channel (key %" PRIu64 ")", channel->key); |
3bd1e081 | 1041 | |
3bd1e081 MD |
1042 | end: |
1043 | return channel; | |
1044 | } | |
1045 | ||
1046 | /* | |
1047 | * Add a channel to the global list protected by a mutex. | |
821fffb2 | 1048 | * |
b5a6470f | 1049 | * Always return 0 indicating success. |
3bd1e081 | 1050 | */ |
d8ef542d MD |
1051 | int consumer_add_channel(struct lttng_consumer_channel *channel, |
1052 | struct lttng_consumer_local_data *ctx) | |
3bd1e081 | 1053 | { |
3bd1e081 | 1054 | pthread_mutex_lock(&consumer_data.lock); |
a9838785 | 1055 | pthread_mutex_lock(&channel->lock); |
ec6ea7d0 | 1056 | pthread_mutex_lock(&channel->timer_lock); |
c77fc10a | 1057 | |
b5a6470f DG |
1058 | /* |
1059 | * This gives us a guarantee that the channel we are about to add to the | |
1060 | * channel hash table will be unique. See this function comment on the why | |
1061 | * we need to steel the channel key at this stage. | |
1062 | */ | |
1063 | steal_channel_key(channel->key); | |
c77fc10a | 1064 | |
b5a6470f | 1065 | rcu_read_lock(); |
d88aee68 | 1066 | lttng_ht_add_unique_u64(consumer_data.channel_ht, &channel->node); |
6065ceec | 1067 | rcu_read_unlock(); |
b5a6470f | 1068 | |
ec6ea7d0 | 1069 | pthread_mutex_unlock(&channel->timer_lock); |
a9838785 | 1070 | pthread_mutex_unlock(&channel->lock); |
3bd1e081 | 1071 | pthread_mutex_unlock(&consumer_data.lock); |
702b1ea4 | 1072 | |
b5a6470f | 1073 | if (channel->wait_fd != -1 && channel->type == CONSUMER_CHANNEL_TYPE_DATA) { |
a0cbdd2e | 1074 | notify_channel_pipe(ctx, channel, -1, CONSUMER_CHANNEL_ADD); |
d8ef542d | 1075 | } |
b5a6470f DG |
1076 | |
1077 | return 0; | |
3bd1e081 MD |
1078 | } |
1079 | ||
1080 | /* | |
1081 | * Allocate the pollfd structure and the local view of the out fds to avoid | |
1082 | * doing a lookup in the linked list and concurrency issues when writing is | |
1083 | * needed. Called with consumer_data.lock held. | |
1084 | * | |
1085 | * Returns the number of fds in the structures. | |
1086 | */ | |
ffe60014 DG |
1087 | static int update_poll_array(struct lttng_consumer_local_data *ctx, |
1088 | struct pollfd **pollfd, struct lttng_consumer_stream **local_stream, | |
9a2fcf78 | 1089 | struct lttng_ht *ht, int *nb_inactive_fd) |
3bd1e081 | 1090 | { |
3bd1e081 | 1091 | int i = 0; |
e4421fec DG |
1092 | struct lttng_ht_iter iter; |
1093 | struct lttng_consumer_stream *stream; | |
3bd1e081 | 1094 | |
ffe60014 DG |
1095 | assert(ctx); |
1096 | assert(ht); | |
1097 | assert(pollfd); | |
1098 | assert(local_stream); | |
1099 | ||
3bd1e081 | 1100 | DBG("Updating poll fd array"); |
9a2fcf78 | 1101 | *nb_inactive_fd = 0; |
481d6c57 | 1102 | rcu_read_lock(); |
43c34bc3 | 1103 | cds_lfht_for_each_entry(ht->ht, &iter.iter, stream, node.node) { |
8994307f DG |
1104 | /* |
1105 | * Only active streams with an active end point can be added to the | |
1106 | * poll set and local stream storage of the thread. | |
1107 | * | |
1108 | * There is a potential race here for endpoint_status to be updated | |
1109 | * just after the check. However, this is OK since the stream(s) will | |
1110 | * be deleted once the thread is notified that the end point state has | |
1111 | * changed where this function will be called back again. | |
9a2fcf78 JD |
1112 | * |
1113 | * We track the number of inactive FDs because they still need to be | |
1114 | * closed by the polling thread after a wakeup on the data_pipe or | |
1115 | * metadata_pipe. | |
8994307f DG |
1116 | */ |
1117 | if (stream->state != LTTNG_CONSUMER_ACTIVE_STREAM || | |
79d4ffb7 | 1118 | stream->endpoint_status == CONSUMER_ENDPOINT_INACTIVE) { |
9a2fcf78 | 1119 | (*nb_inactive_fd)++; |
3bd1e081 MD |
1120 | continue; |
1121 | } | |
7972aab2 DG |
1122 | /* |
1123 | * This clobbers way too much the debug output. Uncomment that if you | |
1124 | * need it for debugging purposes. | |
1125 | * | |
1126 | * DBG("Active FD %d", stream->wait_fd); | |
1127 | */ | |
e4421fec | 1128 | (*pollfd)[i].fd = stream->wait_fd; |
3bd1e081 | 1129 | (*pollfd)[i].events = POLLIN | POLLPRI; |
e4421fec | 1130 | local_stream[i] = stream; |
3bd1e081 MD |
1131 | i++; |
1132 | } | |
481d6c57 | 1133 | rcu_read_unlock(); |
3bd1e081 MD |
1134 | |
1135 | /* | |
50f8ae69 | 1136 | * Insert the consumer_data_pipe at the end of the array and don't |
3bd1e081 MD |
1137 | * increment i so nb_fd is the number of real FD. |
1138 | */ | |
acdb9057 | 1139 | (*pollfd)[i].fd = lttng_pipe_get_readfd(ctx->consumer_data_pipe); |
509bb1cf | 1140 | (*pollfd)[i].events = POLLIN | POLLPRI; |
02b3d176 DG |
1141 | |
1142 | (*pollfd)[i + 1].fd = lttng_pipe_get_readfd(ctx->consumer_wakeup_pipe); | |
1143 | (*pollfd)[i + 1].events = POLLIN | POLLPRI; | |
3bd1e081 MD |
1144 | return i; |
1145 | } | |
1146 | ||
1147 | /* | |
84382d49 MD |
1148 | * Poll on the should_quit pipe and the command socket return -1 on |
1149 | * error, 1 if should exit, 0 if data is available on the command socket | |
3bd1e081 MD |
1150 | */ |
1151 | int lttng_consumer_poll_socket(struct pollfd *consumer_sockpoll) | |
1152 | { | |
1153 | int num_rdy; | |
1154 | ||
88f2b785 | 1155 | restart: |
3bd1e081 MD |
1156 | num_rdy = poll(consumer_sockpoll, 2, -1); |
1157 | if (num_rdy == -1) { | |
88f2b785 MD |
1158 | /* |
1159 | * Restart interrupted system call. | |
1160 | */ | |
1161 | if (errno == EINTR) { | |
1162 | goto restart; | |
1163 | } | |
7a57cf92 | 1164 | PERROR("Poll error"); |
84382d49 | 1165 | return -1; |
3bd1e081 | 1166 | } |
509bb1cf | 1167 | if (consumer_sockpoll[0].revents & (POLLIN | POLLPRI)) { |
3bd1e081 | 1168 | DBG("consumer_should_quit wake up"); |
84382d49 | 1169 | return 1; |
3bd1e081 MD |
1170 | } |
1171 | return 0; | |
3bd1e081 MD |
1172 | } |
1173 | ||
1174 | /* | |
1175 | * Set the error socket. | |
1176 | */ | |
ffe60014 DG |
1177 | void lttng_consumer_set_error_sock(struct lttng_consumer_local_data *ctx, |
1178 | int sock) | |
3bd1e081 MD |
1179 | { |
1180 | ctx->consumer_error_socket = sock; | |
1181 | } | |
1182 | ||
1183 | /* | |
1184 | * Set the command socket path. | |
1185 | */ | |
3bd1e081 MD |
1186 | void lttng_consumer_set_command_sock_path( |
1187 | struct lttng_consumer_local_data *ctx, char *sock) | |
1188 | { | |
1189 | ctx->consumer_command_sock_path = sock; | |
1190 | } | |
1191 | ||
1192 | /* | |
1193 | * Send return code to the session daemon. | |
1194 | * If the socket is not defined, we return 0, it is not a fatal error | |
1195 | */ | |
ffe60014 | 1196 | int lttng_consumer_send_error(struct lttng_consumer_local_data *ctx, int cmd) |
3bd1e081 MD |
1197 | { |
1198 | if (ctx->consumer_error_socket > 0) { | |
1199 | return lttcomm_send_unix_sock(ctx->consumer_error_socket, &cmd, | |
1200 | sizeof(enum lttcomm_sessiond_command)); | |
1201 | } | |
1202 | ||
1203 | return 0; | |
1204 | } | |
1205 | ||
1206 | /* | |
228b5bf7 DG |
1207 | * Close all the tracefiles and stream fds and MUST be called when all |
1208 | * instances are destroyed i.e. when all threads were joined and are ended. | |
3bd1e081 MD |
1209 | */ |
1210 | void lttng_consumer_cleanup(void) | |
1211 | { | |
e4421fec | 1212 | struct lttng_ht_iter iter; |
ffe60014 | 1213 | struct lttng_consumer_channel *channel; |
6065ceec DG |
1214 | |
1215 | rcu_read_lock(); | |
3bd1e081 | 1216 | |
ffe60014 DG |
1217 | cds_lfht_for_each_entry(consumer_data.channel_ht->ht, &iter.iter, channel, |
1218 | node.node) { | |
702b1ea4 | 1219 | consumer_del_channel(channel); |
3bd1e081 | 1220 | } |
6065ceec DG |
1221 | |
1222 | rcu_read_unlock(); | |
d6ce1df2 | 1223 | |
d6ce1df2 | 1224 | lttng_ht_destroy(consumer_data.channel_ht); |
228b5bf7 DG |
1225 | |
1226 | cleanup_relayd_ht(); | |
1227 | ||
d8ef542d MD |
1228 | lttng_ht_destroy(consumer_data.stream_per_chan_id_ht); |
1229 | ||
228b5bf7 DG |
1230 | /* |
1231 | * This HT contains streams that are freed by either the metadata thread or | |
1232 | * the data thread so we do *nothing* on the hash table and simply destroy | |
1233 | * it. | |
1234 | */ | |
1235 | lttng_ht_destroy(consumer_data.stream_list_ht); | |
3bd1e081 MD |
1236 | } |
1237 | ||
1238 | /* | |
1239 | * Called from signal handler. | |
1240 | */ | |
1241 | void lttng_consumer_should_exit(struct lttng_consumer_local_data *ctx) | |
1242 | { | |
6cd525e8 MD |
1243 | ssize_t ret; |
1244 | ||
10211f5c | 1245 | CMM_STORE_SHARED(consumer_quit, 1); |
6cd525e8 MD |
1246 | ret = lttng_write(ctx->consumer_should_quit[1], "4", 1); |
1247 | if (ret < 1) { | |
7a57cf92 | 1248 | PERROR("write consumer quit"); |
3bd1e081 | 1249 | } |
ab1027f4 DG |
1250 | |
1251 | DBG("Consumer flag that it should quit"); | |
3bd1e081 MD |
1252 | } |
1253 | ||
5199ffc4 JG |
1254 | |
1255 | /* | |
1256 | * Flush pending writes to trace output disk file. | |
1257 | */ | |
1258 | static | |
00e2e675 DG |
1259 | void lttng_consumer_sync_trace_file(struct lttng_consumer_stream *stream, |
1260 | off_t orig_offset) | |
3bd1e081 | 1261 | { |
c7a78aab | 1262 | int ret; |
3bd1e081 MD |
1263 | int outfd = stream->out_fd; |
1264 | ||
1265 | /* | |
1266 | * This does a blocking write-and-wait on any page that belongs to the | |
1267 | * subbuffer prior to the one we just wrote. | |
1268 | * Don't care about error values, as these are just hints and ways to | |
1269 | * limit the amount of page cache used. | |
1270 | */ | |
ffe60014 | 1271 | if (orig_offset < stream->max_sb_size) { |
3bd1e081 MD |
1272 | return; |
1273 | } | |
ffe60014 DG |
1274 | lttng_sync_file_range(outfd, orig_offset - stream->max_sb_size, |
1275 | stream->max_sb_size, | |
3bd1e081 MD |
1276 | SYNC_FILE_RANGE_WAIT_BEFORE |
1277 | | SYNC_FILE_RANGE_WRITE | |
1278 | | SYNC_FILE_RANGE_WAIT_AFTER); | |
1279 | /* | |
1280 | * Give hints to the kernel about how we access the file: | |
1281 | * POSIX_FADV_DONTNEED : we won't re-access data in a near future after | |
1282 | * we write it. | |
1283 | * | |
1284 | * We need to call fadvise again after the file grows because the | |
1285 | * kernel does not seem to apply fadvise to non-existing parts of the | |
1286 | * file. | |
1287 | * | |
1288 | * Call fadvise _after_ having waited for the page writeback to | |
1289 | * complete because the dirty page writeback semantic is not well | |
1290 | * defined. So it can be expected to lead to lower throughput in | |
1291 | * streaming. | |
1292 | */ | |
c7a78aab | 1293 | ret = posix_fadvise(outfd, orig_offset - stream->max_sb_size, |
ffe60014 | 1294 | stream->max_sb_size, POSIX_FADV_DONTNEED); |
a0d0e127 | 1295 | if (ret && ret != -ENOSYS) { |
a74a5f4a JG |
1296 | errno = ret; |
1297 | PERROR("posix_fadvise on fd %i", outfd); | |
c7a78aab | 1298 | } |
3bd1e081 MD |
1299 | } |
1300 | ||
1301 | /* | |
1302 | * Initialise the necessary environnement : | |
1303 | * - create a new context | |
1304 | * - create the poll_pipe | |
1305 | * - create the should_quit pipe (for signal handler) | |
1306 | * - create the thread pipe (for splice) | |
1307 | * | |
1308 | * Takes a function pointer as argument, this function is called when data is | |
1309 | * available on a buffer. This function is responsible to do the | |
1310 | * kernctl_get_next_subbuf, read the data with mmap or splice depending on the | |
1311 | * buffer configuration and then kernctl_put_next_subbuf at the end. | |
1312 | * | |
1313 | * Returns a pointer to the new context or NULL on error. | |
1314 | */ | |
1315 | struct lttng_consumer_local_data *lttng_consumer_create( | |
1316 | enum lttng_consumer_type type, | |
4078b776 | 1317 | ssize_t (*buffer_ready)(struct lttng_consumer_stream *stream, |
d41f73b7 | 1318 | struct lttng_consumer_local_data *ctx), |
3bd1e081 MD |
1319 | int (*recv_channel)(struct lttng_consumer_channel *channel), |
1320 | int (*recv_stream)(struct lttng_consumer_stream *stream), | |
30319bcb | 1321 | int (*update_stream)(uint64_t stream_key, uint32_t state)) |
3bd1e081 | 1322 | { |
d8ef542d | 1323 | int ret; |
3bd1e081 MD |
1324 | struct lttng_consumer_local_data *ctx; |
1325 | ||
1326 | assert(consumer_data.type == LTTNG_CONSUMER_UNKNOWN || | |
1327 | consumer_data.type == type); | |
1328 | consumer_data.type = type; | |
1329 | ||
effcf122 | 1330 | ctx = zmalloc(sizeof(struct lttng_consumer_local_data)); |
3bd1e081 | 1331 | if (ctx == NULL) { |
7a57cf92 | 1332 | PERROR("allocating context"); |
3bd1e081 MD |
1333 | goto error; |
1334 | } | |
1335 | ||
1336 | ctx->consumer_error_socket = -1; | |
331744e3 | 1337 | ctx->consumer_metadata_socket = -1; |
75d83e50 | 1338 | pthread_mutex_init(&ctx->metadata_socket_lock, NULL); |
3bd1e081 MD |
1339 | /* assign the callbacks */ |
1340 | ctx->on_buffer_ready = buffer_ready; | |
1341 | ctx->on_recv_channel = recv_channel; | |
1342 | ctx->on_recv_stream = recv_stream; | |
1343 | ctx->on_update_stream = update_stream; | |
1344 | ||
acdb9057 DG |
1345 | ctx->consumer_data_pipe = lttng_pipe_open(0); |
1346 | if (!ctx->consumer_data_pipe) { | |
3bd1e081 MD |
1347 | goto error_poll_pipe; |
1348 | } | |
1349 | ||
02b3d176 DG |
1350 | ctx->consumer_wakeup_pipe = lttng_pipe_open(0); |
1351 | if (!ctx->consumer_wakeup_pipe) { | |
1352 | goto error_wakeup_pipe; | |
1353 | } | |
1354 | ||
3bd1e081 MD |
1355 | ret = pipe(ctx->consumer_should_quit); |
1356 | if (ret < 0) { | |
7a57cf92 | 1357 | PERROR("Error creating recv pipe"); |
3bd1e081 MD |
1358 | goto error_quit_pipe; |
1359 | } | |
1360 | ||
d8ef542d MD |
1361 | ret = pipe(ctx->consumer_channel_pipe); |
1362 | if (ret < 0) { | |
1363 | PERROR("Error creating channel pipe"); | |
1364 | goto error_channel_pipe; | |
1365 | } | |
1366 | ||
13886d2d DG |
1367 | ctx->consumer_metadata_pipe = lttng_pipe_open(0); |
1368 | if (!ctx->consumer_metadata_pipe) { | |
fb3a43a9 DG |
1369 | goto error_metadata_pipe; |
1370 | } | |
3bd1e081 | 1371 | |
e9404c27 JG |
1372 | ctx->channel_monitor_pipe = -1; |
1373 | ||
fb3a43a9 | 1374 | return ctx; |
3bd1e081 | 1375 | |
fb3a43a9 | 1376 | error_metadata_pipe: |
d8ef542d MD |
1377 | utils_close_pipe(ctx->consumer_channel_pipe); |
1378 | error_channel_pipe: | |
d8ef542d | 1379 | utils_close_pipe(ctx->consumer_should_quit); |
3bd1e081 | 1380 | error_quit_pipe: |
02b3d176 DG |
1381 | lttng_pipe_destroy(ctx->consumer_wakeup_pipe); |
1382 | error_wakeup_pipe: | |
acdb9057 | 1383 | lttng_pipe_destroy(ctx->consumer_data_pipe); |
3bd1e081 MD |
1384 | error_poll_pipe: |
1385 | free(ctx); | |
1386 | error: | |
1387 | return NULL; | |
1388 | } | |
1389 | ||
282dadbc MD |
1390 | /* |
1391 | * Iterate over all streams of the hashtable and free them properly. | |
1392 | */ | |
1393 | static void destroy_data_stream_ht(struct lttng_ht *ht) | |
1394 | { | |
1395 | struct lttng_ht_iter iter; | |
1396 | struct lttng_consumer_stream *stream; | |
1397 | ||
1398 | if (ht == NULL) { | |
1399 | return; | |
1400 | } | |
1401 | ||
1402 | rcu_read_lock(); | |
1403 | cds_lfht_for_each_entry(ht->ht, &iter.iter, stream, node.node) { | |
1404 | /* | |
1405 | * Ignore return value since we are currently cleaning up so any error | |
1406 | * can't be handled. | |
1407 | */ | |
1408 | (void) consumer_del_stream(stream, ht); | |
1409 | } | |
1410 | rcu_read_unlock(); | |
1411 | ||
1412 | lttng_ht_destroy(ht); | |
1413 | } | |
1414 | ||
1415 | /* | |
1416 | * Iterate over all streams of the metadata hashtable and free them | |
1417 | * properly. | |
1418 | */ | |
1419 | static void destroy_metadata_stream_ht(struct lttng_ht *ht) | |
1420 | { | |
1421 | struct lttng_ht_iter iter; | |
1422 | struct lttng_consumer_stream *stream; | |
1423 | ||
1424 | if (ht == NULL) { | |
1425 | return; | |
1426 | } | |
1427 | ||
1428 | rcu_read_lock(); | |
1429 | cds_lfht_for_each_entry(ht->ht, &iter.iter, stream, node.node) { | |
1430 | /* | |
1431 | * Ignore return value since we are currently cleaning up so any error | |
1432 | * can't be handled. | |
1433 | */ | |
1434 | (void) consumer_del_metadata_stream(stream, ht); | |
1435 | } | |
1436 | rcu_read_unlock(); | |
1437 | ||
1438 | lttng_ht_destroy(ht); | |
1439 | } | |
1440 | ||
3bd1e081 MD |
1441 | /* |
1442 | * Close all fds associated with the instance and free the context. | |
1443 | */ | |
1444 | void lttng_consumer_destroy(struct lttng_consumer_local_data *ctx) | |
1445 | { | |
4c462e79 MD |
1446 | int ret; |
1447 | ||
ab1027f4 DG |
1448 | DBG("Consumer destroying it. Closing everything."); |
1449 | ||
4f2e75b9 DG |
1450 | if (!ctx) { |
1451 | return; | |
1452 | } | |
1453 | ||
282dadbc MD |
1454 | destroy_data_stream_ht(data_ht); |
1455 | destroy_metadata_stream_ht(metadata_ht); | |
1456 | ||
4c462e79 MD |
1457 | ret = close(ctx->consumer_error_socket); |
1458 | if (ret) { | |
1459 | PERROR("close"); | |
1460 | } | |
331744e3 JD |
1461 | ret = close(ctx->consumer_metadata_socket); |
1462 | if (ret) { | |
1463 | PERROR("close"); | |
1464 | } | |
d8ef542d | 1465 | utils_close_pipe(ctx->consumer_channel_pipe); |
acdb9057 | 1466 | lttng_pipe_destroy(ctx->consumer_data_pipe); |
13886d2d | 1467 | lttng_pipe_destroy(ctx->consumer_metadata_pipe); |
02b3d176 | 1468 | lttng_pipe_destroy(ctx->consumer_wakeup_pipe); |
d8ef542d | 1469 | utils_close_pipe(ctx->consumer_should_quit); |
fb3a43a9 | 1470 | |
3bd1e081 MD |
1471 | unlink(ctx->consumer_command_sock_path); |
1472 | free(ctx); | |
1473 | } | |
1474 | ||
6197aea7 DG |
1475 | /* |
1476 | * Write the metadata stream id on the specified file descriptor. | |
1477 | */ | |
1478 | static int write_relayd_metadata_id(int fd, | |
1479 | struct lttng_consumer_stream *stream, | |
239f61af | 1480 | unsigned long padding) |
6197aea7 | 1481 | { |
6cd525e8 | 1482 | ssize_t ret; |
1d4dfdef | 1483 | struct lttcomm_relayd_metadata_payload hdr; |
6197aea7 | 1484 | |
1d4dfdef DG |
1485 | hdr.stream_id = htobe64(stream->relayd_stream_id); |
1486 | hdr.padding_size = htobe32(padding); | |
6cd525e8 MD |
1487 | ret = lttng_write(fd, (void *) &hdr, sizeof(hdr)); |
1488 | if (ret < sizeof(hdr)) { | |
d7b75ec8 | 1489 | /* |
6f04ed72 | 1490 | * This error means that the fd's end is closed so ignore the PERROR |
d7b75ec8 DG |
1491 | * not to clubber the error output since this can happen in a normal |
1492 | * code path. | |
1493 | */ | |
1494 | if (errno != EPIPE) { | |
1495 | PERROR("write metadata stream id"); | |
1496 | } | |
1497 | DBG3("Consumer failed to write relayd metadata id (errno: %d)", errno); | |
534d2592 DG |
1498 | /* |
1499 | * Set ret to a negative value because if ret != sizeof(hdr), we don't | |
1500 | * handle writting the missing part so report that as an error and | |
1501 | * don't lie to the caller. | |
1502 | */ | |
1503 | ret = -1; | |
6197aea7 DG |
1504 | goto end; |
1505 | } | |
1d4dfdef DG |
1506 | DBG("Metadata stream id %" PRIu64 " with padding %lu written before data", |
1507 | stream->relayd_stream_id, padding); | |
6197aea7 DG |
1508 | |
1509 | end: | |
6cd525e8 | 1510 | return (int) ret; |
6197aea7 DG |
1511 | } |
1512 | ||
3bd1e081 | 1513 | /* |
09e26845 DG |
1514 | * Mmap the ring buffer, read it and write the data to the tracefile. This is a |
1515 | * core function for writing trace buffers to either the local filesystem or | |
1516 | * the network. | |
1517 | * | |
79d4ffb7 DG |
1518 | * It must be called with the stream lock held. |
1519 | * | |
09e26845 | 1520 | * Careful review MUST be put if any changes occur! |
3bd1e081 MD |
1521 | * |
1522 | * Returns the number of bytes written | |
1523 | */ | |
4078b776 | 1524 | ssize_t lttng_consumer_on_read_subbuffer_mmap( |
3bd1e081 | 1525 | struct lttng_consumer_local_data *ctx, |
1d4dfdef | 1526 | struct lttng_consumer_stream *stream, unsigned long len, |
309167d2 | 1527 | unsigned long padding, |
50adc264 | 1528 | struct ctf_packet_index *index) |
3bd1e081 | 1529 | { |
f02e1e8a | 1530 | unsigned long mmap_offset; |
ffe60014 | 1531 | void *mmap_base; |
994ab360 | 1532 | ssize_t ret = 0; |
f02e1e8a DG |
1533 | off_t orig_offset = stream->out_fd_offset; |
1534 | /* Default is on the disk */ | |
1535 | int outfd = stream->out_fd; | |
f02e1e8a | 1536 | struct consumer_relayd_sock_pair *relayd = NULL; |
8994307f | 1537 | unsigned int relayd_hang_up = 0; |
f02e1e8a DG |
1538 | |
1539 | /* RCU lock for the relayd pointer */ | |
1540 | rcu_read_lock(); | |
1541 | ||
1542 | /* Flag that the current stream if set for network streaming. */ | |
da009f2c | 1543 | if (stream->net_seq_idx != (uint64_t) -1ULL) { |
f02e1e8a DG |
1544 | relayd = consumer_find_relayd(stream->net_seq_idx); |
1545 | if (relayd == NULL) { | |
56591bac | 1546 | ret = -EPIPE; |
f02e1e8a DG |
1547 | goto end; |
1548 | } | |
1549 | } | |
1550 | ||
1551 | /* get the offset inside the fd to mmap */ | |
3bd1e081 MD |
1552 | switch (consumer_data.type) { |
1553 | case LTTNG_CONSUMER_KERNEL: | |
ffe60014 | 1554 | mmap_base = stream->mmap_base; |
f02e1e8a | 1555 | ret = kernctl_get_mmap_read_offset(stream->wait_fd, &mmap_offset); |
994ab360 | 1556 | if (ret < 0) { |
56591bac | 1557 | PERROR("tracer ctl get_mmap_read_offset"); |
56591bac MD |
1558 | goto end; |
1559 | } | |
f02e1e8a | 1560 | break; |
7753dea8 MD |
1561 | case LTTNG_CONSUMER32_UST: |
1562 | case LTTNG_CONSUMER64_UST: | |
ffe60014 DG |
1563 | mmap_base = lttng_ustctl_get_mmap_base(stream); |
1564 | if (!mmap_base) { | |
1565 | ERR("read mmap get mmap base for stream %s", stream->name); | |
994ab360 | 1566 | ret = -EPERM; |
ffe60014 DG |
1567 | goto end; |
1568 | } | |
1569 | ret = lttng_ustctl_get_mmap_read_offset(stream, &mmap_offset); | |
56591bac MD |
1570 | if (ret != 0) { |
1571 | PERROR("tracer ctl get_mmap_read_offset"); | |
994ab360 | 1572 | ret = -EINVAL; |
56591bac MD |
1573 | goto end; |
1574 | } | |
f02e1e8a | 1575 | break; |
3bd1e081 MD |
1576 | default: |
1577 | ERR("Unknown consumer_data type"); | |
1578 | assert(0); | |
1579 | } | |
b9182dd9 | 1580 | |
f02e1e8a DG |
1581 | /* Handle stream on the relayd if the output is on the network */ |
1582 | if (relayd) { | |
1583 | unsigned long netlen = len; | |
1584 | ||
1585 | /* | |
1586 | * Lock the control socket for the complete duration of the function | |
1587 | * since from this point on we will use the socket. | |
1588 | */ | |
1589 | if (stream->metadata_flag) { | |
1590 | /* Metadata requires the control socket. */ | |
1591 | pthread_mutex_lock(&relayd->ctrl_sock_mutex); | |
93ec662e JD |
1592 | if (stream->reset_metadata_flag) { |
1593 | ret = relayd_reset_metadata(&relayd->control_sock, | |
1594 | stream->relayd_stream_id, | |
1595 | stream->metadata_version); | |
1596 | if (ret < 0) { | |
1597 | relayd_hang_up = 1; | |
1598 | goto write_error; | |
1599 | } | |
1600 | stream->reset_metadata_flag = 0; | |
1601 | } | |
1d4dfdef | 1602 | netlen += sizeof(struct lttcomm_relayd_metadata_payload); |
f02e1e8a DG |
1603 | } |
1604 | ||
1d4dfdef | 1605 | ret = write_relayd_stream_header(stream, netlen, padding, relayd); |
994ab360 DG |
1606 | if (ret < 0) { |
1607 | relayd_hang_up = 1; | |
1608 | goto write_error; | |
1609 | } | |
1610 | /* Use the returned socket. */ | |
1611 | outfd = ret; | |
f02e1e8a | 1612 | |
994ab360 DG |
1613 | /* Write metadata stream id before payload */ |
1614 | if (stream->metadata_flag) { | |
239f61af | 1615 | ret = write_relayd_metadata_id(outfd, stream, padding); |
994ab360 | 1616 | if (ret < 0) { |
8994307f DG |
1617 | relayd_hang_up = 1; |
1618 | goto write_error; | |
1619 | } | |
f02e1e8a | 1620 | } |
1d4dfdef DG |
1621 | } else { |
1622 | /* No streaming, we have to set the len with the full padding */ | |
1623 | len += padding; | |
1624d5b7 | 1624 | |
93ec662e JD |
1625 | if (stream->metadata_flag && stream->reset_metadata_flag) { |
1626 | ret = utils_truncate_stream_file(stream->out_fd, 0); | |
1627 | if (ret < 0) { | |
1628 | ERR("Reset metadata file"); | |
1629 | goto end; | |
1630 | } | |
1631 | stream->reset_metadata_flag = 0; | |
1632 | } | |
1633 | ||
1624d5b7 JD |
1634 | /* |
1635 | * Check if we need to change the tracefile before writing the packet. | |
1636 | */ | |
1637 | if (stream->chan->tracefile_size > 0 && | |
1638 | (stream->tracefile_size_current + len) > | |
1639 | stream->chan->tracefile_size) { | |
fe4477ee JD |
1640 | ret = utils_rotate_stream_file(stream->chan->pathname, |
1641 | stream->name, stream->chan->tracefile_size, | |
1642 | stream->chan->tracefile_count, stream->uid, stream->gid, | |
309167d2 JD |
1643 | stream->out_fd, &(stream->tracefile_count_current), |
1644 | &stream->out_fd); | |
1624d5b7 JD |
1645 | if (ret < 0) { |
1646 | ERR("Rotating output file"); | |
1647 | goto end; | |
1648 | } | |
309167d2 JD |
1649 | outfd = stream->out_fd; |
1650 | ||
f8f3885c MD |
1651 | if (stream->index_file) { |
1652 | lttng_index_file_put(stream->index_file); | |
1653 | stream->index_file = lttng_index_file_create(stream->chan->pathname, | |
309167d2 JD |
1654 | stream->name, stream->uid, stream->gid, |
1655 | stream->chan->tracefile_size, | |
f8f3885c MD |
1656 | stream->tracefile_count_current, |
1657 | CTF_INDEX_MAJOR, CTF_INDEX_MINOR); | |
1658 | if (!stream->index_file) { | |
309167d2 JD |
1659 | goto end; |
1660 | } | |
309167d2 JD |
1661 | } |
1662 | ||
a6976990 DG |
1663 | /* Reset current size because we just perform a rotation. */ |
1664 | stream->tracefile_size_current = 0; | |
a1ae300f JD |
1665 | stream->out_fd_offset = 0; |
1666 | orig_offset = 0; | |
1624d5b7 JD |
1667 | } |
1668 | stream->tracefile_size_current += len; | |
309167d2 JD |
1669 | if (index) { |
1670 | index->offset = htobe64(stream->out_fd_offset); | |
1671 | } | |
f02e1e8a DG |
1672 | } |
1673 | ||
d02b8372 DG |
1674 | /* |
1675 | * This call guarantee that len or less is returned. It's impossible to | |
1676 | * receive a ret value that is bigger than len. | |
1677 | */ | |
1678 | ret = lttng_write(outfd, mmap_base + mmap_offset, len); | |
1679 | DBG("Consumer mmap write() ret %zd (len %lu)", ret, len); | |
1680 | if (ret < 0 || ((size_t) ret != len)) { | |
1681 | /* | |
1682 | * Report error to caller if nothing was written else at least send the | |
1683 | * amount written. | |
1684 | */ | |
1685 | if (ret < 0) { | |
994ab360 | 1686 | ret = -errno; |
f02e1e8a | 1687 | } |
994ab360 | 1688 | relayd_hang_up = 1; |
f02e1e8a | 1689 | |
d02b8372 | 1690 | /* Socket operation failed. We consider the relayd dead */ |
994ab360 | 1691 | if (errno == EPIPE || errno == EINVAL || errno == EBADF) { |
d02b8372 DG |
1692 | /* |
1693 | * This is possible if the fd is closed on the other side | |
1694 | * (outfd) or any write problem. It can be verbose a bit for a | |
1695 | * normal execution if for instance the relayd is stopped | |
1696 | * abruptly. This can happen so set this to a DBG statement. | |
1697 | */ | |
1698 | DBG("Consumer mmap write detected relayd hang up"); | |
994ab360 DG |
1699 | } else { |
1700 | /* Unhandled error, print it and stop function right now. */ | |
1701 | PERROR("Error in write mmap (ret %zd != len %lu)", ret, len); | |
f02e1e8a | 1702 | } |
994ab360 | 1703 | goto write_error; |
d02b8372 DG |
1704 | } |
1705 | stream->output_written += ret; | |
d02b8372 DG |
1706 | |
1707 | /* This call is useless on a socket so better save a syscall. */ | |
1708 | if (!relayd) { | |
1709 | /* This won't block, but will start writeout asynchronously */ | |
1710 | lttng_sync_file_range(outfd, stream->out_fd_offset, len, | |
1711 | SYNC_FILE_RANGE_WRITE); | |
1712 | stream->out_fd_offset += len; | |
f5dbe415 | 1713 | lttng_consumer_sync_trace_file(stream, orig_offset); |
f02e1e8a | 1714 | } |
f02e1e8a | 1715 | |
8994307f DG |
1716 | write_error: |
1717 | /* | |
1718 | * This is a special case that the relayd has closed its socket. Let's | |
1719 | * cleanup the relayd object and all associated streams. | |
1720 | */ | |
1721 | if (relayd && relayd_hang_up) { | |
1722 | cleanup_relayd(relayd, ctx); | |
1723 | } | |
1724 | ||
f02e1e8a DG |
1725 | end: |
1726 | /* Unlock only if ctrl socket used */ | |
1727 | if (relayd && stream->metadata_flag) { | |
1728 | pthread_mutex_unlock(&relayd->ctrl_sock_mutex); | |
1729 | } | |
1730 | ||
1731 | rcu_read_unlock(); | |
994ab360 | 1732 | return ret; |
3bd1e081 MD |
1733 | } |
1734 | ||
1735 | /* | |
1736 | * Splice the data from the ring buffer to the tracefile. | |
1737 | * | |
79d4ffb7 DG |
1738 | * It must be called with the stream lock held. |
1739 | * | |
3bd1e081 MD |
1740 | * Returns the number of bytes spliced. |
1741 | */ | |
4078b776 | 1742 | ssize_t lttng_consumer_on_read_subbuffer_splice( |
3bd1e081 | 1743 | struct lttng_consumer_local_data *ctx, |
1d4dfdef | 1744 | struct lttng_consumer_stream *stream, unsigned long len, |
309167d2 | 1745 | unsigned long padding, |
50adc264 | 1746 | struct ctf_packet_index *index) |
3bd1e081 | 1747 | { |
f02e1e8a DG |
1748 | ssize_t ret = 0, written = 0, ret_splice = 0; |
1749 | loff_t offset = 0; | |
1750 | off_t orig_offset = stream->out_fd_offset; | |
1751 | int fd = stream->wait_fd; | |
1752 | /* Default is on the disk */ | |
1753 | int outfd = stream->out_fd; | |
f02e1e8a | 1754 | struct consumer_relayd_sock_pair *relayd = NULL; |
fb3a43a9 | 1755 | int *splice_pipe; |
8994307f | 1756 | unsigned int relayd_hang_up = 0; |
f02e1e8a | 1757 | |
3bd1e081 MD |
1758 | switch (consumer_data.type) { |
1759 | case LTTNG_CONSUMER_KERNEL: | |
f02e1e8a | 1760 | break; |
7753dea8 MD |
1761 | case LTTNG_CONSUMER32_UST: |
1762 | case LTTNG_CONSUMER64_UST: | |
f02e1e8a | 1763 | /* Not supported for user space tracing */ |
3bd1e081 MD |
1764 | return -ENOSYS; |
1765 | default: | |
1766 | ERR("Unknown consumer_data type"); | |
1767 | assert(0); | |
3bd1e081 MD |
1768 | } |
1769 | ||
f02e1e8a DG |
1770 | /* RCU lock for the relayd pointer */ |
1771 | rcu_read_lock(); | |
1772 | ||
1773 | /* Flag that the current stream if set for network streaming. */ | |
da009f2c | 1774 | if (stream->net_seq_idx != (uint64_t) -1ULL) { |
f02e1e8a DG |
1775 | relayd = consumer_find_relayd(stream->net_seq_idx); |
1776 | if (relayd == NULL) { | |
ad0b0d23 | 1777 | written = -ret; |
f02e1e8a DG |
1778 | goto end; |
1779 | } | |
1780 | } | |
a2361a61 | 1781 | splice_pipe = stream->splice_pipe; |
fb3a43a9 | 1782 | |
f02e1e8a | 1783 | /* Write metadata stream id before payload */ |
1d4dfdef | 1784 | if (relayd) { |
ad0b0d23 | 1785 | unsigned long total_len = len; |
f02e1e8a | 1786 | |
1d4dfdef DG |
1787 | if (stream->metadata_flag) { |
1788 | /* | |
1789 | * Lock the control socket for the complete duration of the function | |
1790 | * since from this point on we will use the socket. | |
1791 | */ | |
1792 | pthread_mutex_lock(&relayd->ctrl_sock_mutex); | |
1793 | ||
93ec662e JD |
1794 | if (stream->reset_metadata_flag) { |
1795 | ret = relayd_reset_metadata(&relayd->control_sock, | |
1796 | stream->relayd_stream_id, | |
1797 | stream->metadata_version); | |
1798 | if (ret < 0) { | |
1799 | relayd_hang_up = 1; | |
1800 | goto write_error; | |
1801 | } | |
1802 | stream->reset_metadata_flag = 0; | |
1803 | } | |
239f61af | 1804 | ret = write_relayd_metadata_id(splice_pipe[1], stream, |
1d4dfdef DG |
1805 | padding); |
1806 | if (ret < 0) { | |
1807 | written = ret; | |
ad0b0d23 DG |
1808 | relayd_hang_up = 1; |
1809 | goto write_error; | |
1d4dfdef DG |
1810 | } |
1811 | ||
1812 | total_len += sizeof(struct lttcomm_relayd_metadata_payload); | |
1813 | } | |
1814 | ||
1815 | ret = write_relayd_stream_header(stream, total_len, padding, relayd); | |
ad0b0d23 DG |
1816 | if (ret < 0) { |
1817 | written = ret; | |
1818 | relayd_hang_up = 1; | |
1819 | goto write_error; | |
f02e1e8a | 1820 | } |
ad0b0d23 DG |
1821 | /* Use the returned socket. */ |
1822 | outfd = ret; | |
1d4dfdef DG |
1823 | } else { |
1824 | /* No streaming, we have to set the len with the full padding */ | |
1825 | len += padding; | |
1624d5b7 | 1826 | |
93ec662e JD |
1827 | if (stream->metadata_flag && stream->reset_metadata_flag) { |
1828 | ret = utils_truncate_stream_file(stream->out_fd, 0); | |
1829 | if (ret < 0) { | |
1830 | ERR("Reset metadata file"); | |
1831 | goto end; | |
1832 | } | |
1833 | stream->reset_metadata_flag = 0; | |
1834 | } | |
1624d5b7 JD |
1835 | /* |
1836 | * Check if we need to change the tracefile before writing the packet. | |
1837 | */ | |
1838 | if (stream->chan->tracefile_size > 0 && | |
1839 | (stream->tracefile_size_current + len) > | |
1840 | stream->chan->tracefile_size) { | |
fe4477ee JD |
1841 | ret = utils_rotate_stream_file(stream->chan->pathname, |
1842 | stream->name, stream->chan->tracefile_size, | |
1843 | stream->chan->tracefile_count, stream->uid, stream->gid, | |
309167d2 JD |
1844 | stream->out_fd, &(stream->tracefile_count_current), |
1845 | &stream->out_fd); | |
1624d5b7 | 1846 | if (ret < 0) { |
ad0b0d23 | 1847 | written = ret; |
1624d5b7 JD |
1848 | ERR("Rotating output file"); |
1849 | goto end; | |
1850 | } | |
309167d2 JD |
1851 | outfd = stream->out_fd; |
1852 | ||
f8f3885c MD |
1853 | if (stream->index_file) { |
1854 | lttng_index_file_put(stream->index_file); | |
1855 | stream->index_file = lttng_index_file_create(stream->chan->pathname, | |
309167d2 JD |
1856 | stream->name, stream->uid, stream->gid, |
1857 | stream->chan->tracefile_size, | |
f8f3885c MD |
1858 | stream->tracefile_count_current, |
1859 | CTF_INDEX_MAJOR, CTF_INDEX_MINOR); | |
1860 | if (!stream->index_file) { | |
309167d2 JD |
1861 | goto end; |
1862 | } | |
309167d2 JD |
1863 | } |
1864 | ||
a6976990 DG |
1865 | /* Reset current size because we just perform a rotation. */ |
1866 | stream->tracefile_size_current = 0; | |
a1ae300f JD |
1867 | stream->out_fd_offset = 0; |
1868 | orig_offset = 0; | |
1624d5b7 JD |
1869 | } |
1870 | stream->tracefile_size_current += len; | |
309167d2 | 1871 | index->offset = htobe64(stream->out_fd_offset); |
f02e1e8a DG |
1872 | } |
1873 | ||
1874 | while (len > 0) { | |
1d4dfdef DG |
1875 | DBG("splice chan to pipe offset %lu of len %lu (fd : %d, pipe: %d)", |
1876 | (unsigned long)offset, len, fd, splice_pipe[1]); | |
fb3a43a9 | 1877 | ret_splice = splice(fd, &offset, splice_pipe[1], NULL, len, |
f02e1e8a DG |
1878 | SPLICE_F_MOVE | SPLICE_F_MORE); |
1879 | DBG("splice chan to pipe, ret %zd", ret_splice); | |
1880 | if (ret_splice < 0) { | |
d02b8372 | 1881 | ret = errno; |
ad0b0d23 | 1882 | written = -ret; |
d02b8372 | 1883 | PERROR("Error in relay splice"); |
f02e1e8a DG |
1884 | goto splice_error; |
1885 | } | |
1886 | ||
1887 | /* Handle stream on the relayd if the output is on the network */ | |
ad0b0d23 DG |
1888 | if (relayd && stream->metadata_flag) { |
1889 | size_t metadata_payload_size = | |
1890 | sizeof(struct lttcomm_relayd_metadata_payload); | |
1891 | ||
1892 | /* Update counter to fit the spliced data */ | |
1893 | ret_splice += metadata_payload_size; | |
1894 | len += metadata_payload_size; | |
1895 | /* | |
1896 | * We do this so the return value can match the len passed as | |
1897 | * argument to this function. | |
1898 | */ | |
1899 | written -= metadata_payload_size; | |
f02e1e8a DG |
1900 | } |
1901 | ||
1902 | /* Splice data out */ | |
fb3a43a9 | 1903 | ret_splice = splice(splice_pipe[0], NULL, outfd, NULL, |
f02e1e8a | 1904 | ret_splice, SPLICE_F_MOVE | SPLICE_F_MORE); |
a2361a61 JD |
1905 | DBG("Consumer splice pipe to file (out_fd: %d), ret %zd", |
1906 | outfd, ret_splice); | |
f02e1e8a | 1907 | if (ret_splice < 0) { |
d02b8372 | 1908 | ret = errno; |
ad0b0d23 DG |
1909 | written = -ret; |
1910 | relayd_hang_up = 1; | |
1911 | goto write_error; | |
f02e1e8a | 1912 | } else if (ret_splice > len) { |
d02b8372 DG |
1913 | /* |
1914 | * We don't expect this code path to be executed but you never know | |
1915 | * so this is an extra protection agains a buggy splice(). | |
1916 | */ | |
f02e1e8a | 1917 | ret = errno; |
ad0b0d23 | 1918 | written += ret_splice; |
d02b8372 DG |
1919 | PERROR("Wrote more data than requested %zd (len: %lu)", ret_splice, |
1920 | len); | |
f02e1e8a | 1921 | goto splice_error; |
d02b8372 DG |
1922 | } else { |
1923 | /* All good, update current len and continue. */ | |
1924 | len -= ret_splice; | |
f02e1e8a | 1925 | } |
f02e1e8a DG |
1926 | |
1927 | /* This call is useless on a socket so better save a syscall. */ | |
1928 | if (!relayd) { | |
1929 | /* This won't block, but will start writeout asynchronously */ | |
1930 | lttng_sync_file_range(outfd, stream->out_fd_offset, ret_splice, | |
1931 | SYNC_FILE_RANGE_WRITE); | |
1932 | stream->out_fd_offset += ret_splice; | |
1933 | } | |
e5d1a9b3 | 1934 | stream->output_written += ret_splice; |
f02e1e8a DG |
1935 | written += ret_splice; |
1936 | } | |
f5dbe415 JG |
1937 | if (!relayd) { |
1938 | lttng_consumer_sync_trace_file(stream, orig_offset); | |
1939 | } | |
f02e1e8a DG |
1940 | goto end; |
1941 | ||
8994307f DG |
1942 | write_error: |
1943 | /* | |
1944 | * This is a special case that the relayd has closed its socket. Let's | |
1945 | * cleanup the relayd object and all associated streams. | |
1946 | */ | |
1947 | if (relayd && relayd_hang_up) { | |
1948 | cleanup_relayd(relayd, ctx); | |
1949 | /* Skip splice error so the consumer does not fail */ | |
1950 | goto end; | |
1951 | } | |
1952 | ||
f02e1e8a DG |
1953 | splice_error: |
1954 | /* send the appropriate error description to sessiond */ | |
1955 | switch (ret) { | |
f02e1e8a | 1956 | case EINVAL: |
f73fabfd | 1957 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_SPLICE_EINVAL); |
f02e1e8a DG |
1958 | break; |
1959 | case ENOMEM: | |
f73fabfd | 1960 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_SPLICE_ENOMEM); |
f02e1e8a DG |
1961 | break; |
1962 | case ESPIPE: | |
f73fabfd | 1963 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_SPLICE_ESPIPE); |
f02e1e8a DG |
1964 | break; |
1965 | } | |
1966 | ||
1967 | end: | |
1968 | if (relayd && stream->metadata_flag) { | |
1969 | pthread_mutex_unlock(&relayd->ctrl_sock_mutex); | |
1970 | } | |
1971 | ||
1972 | rcu_read_unlock(); | |
1973 | return written; | |
3bd1e081 MD |
1974 | } |
1975 | ||
15055ce5 JD |
1976 | /* |
1977 | * Sample the snapshot positions for a specific fd | |
1978 | * | |
1979 | * Returns 0 on success, < 0 on error | |
1980 | */ | |
1981 | int lttng_consumer_sample_snapshot_positions(struct lttng_consumer_stream *stream) | |
1982 | { | |
1983 | switch (consumer_data.type) { | |
1984 | case LTTNG_CONSUMER_KERNEL: | |
1985 | return lttng_kconsumer_sample_snapshot_positions(stream); | |
1986 | case LTTNG_CONSUMER32_UST: | |
1987 | case LTTNG_CONSUMER64_UST: | |
1988 | return lttng_ustconsumer_sample_snapshot_positions(stream); | |
1989 | default: | |
1990 | ERR("Unknown consumer_data type"); | |
1991 | assert(0); | |
1992 | return -ENOSYS; | |
1993 | } | |
1994 | } | |
3bd1e081 MD |
1995 | /* |
1996 | * Take a snapshot for a specific fd | |
1997 | * | |
1998 | * Returns 0 on success, < 0 on error | |
1999 | */ | |
ffe60014 | 2000 | int lttng_consumer_take_snapshot(struct lttng_consumer_stream *stream) |
3bd1e081 MD |
2001 | { |
2002 | switch (consumer_data.type) { | |
2003 | case LTTNG_CONSUMER_KERNEL: | |
ffe60014 | 2004 | return lttng_kconsumer_take_snapshot(stream); |
7753dea8 MD |
2005 | case LTTNG_CONSUMER32_UST: |
2006 | case LTTNG_CONSUMER64_UST: | |
ffe60014 | 2007 | return lttng_ustconsumer_take_snapshot(stream); |
3bd1e081 MD |
2008 | default: |
2009 | ERR("Unknown consumer_data type"); | |
2010 | assert(0); | |
2011 | return -ENOSYS; | |
2012 | } | |
3bd1e081 MD |
2013 | } |
2014 | ||
2015 | /* | |
2016 | * Get the produced position | |
2017 | * | |
2018 | * Returns 0 on success, < 0 on error | |
2019 | */ | |
ffe60014 | 2020 | int lttng_consumer_get_produced_snapshot(struct lttng_consumer_stream *stream, |
3bd1e081 MD |
2021 | unsigned long *pos) |
2022 | { | |
2023 | switch (consumer_data.type) { | |
2024 | case LTTNG_CONSUMER_KERNEL: | |
ffe60014 | 2025 | return lttng_kconsumer_get_produced_snapshot(stream, pos); |
7753dea8 MD |
2026 | case LTTNG_CONSUMER32_UST: |
2027 | case LTTNG_CONSUMER64_UST: | |
ffe60014 | 2028 | return lttng_ustconsumer_get_produced_snapshot(stream, pos); |
3bd1e081 MD |
2029 | default: |
2030 | ERR("Unknown consumer_data type"); | |
2031 | assert(0); | |
2032 | return -ENOSYS; | |
2033 | } | |
2034 | } | |
2035 | ||
15055ce5 JD |
2036 | /* |
2037 | * Get the consumed position (free-running counter position in bytes). | |
2038 | * | |
2039 | * Returns 0 on success, < 0 on error | |
2040 | */ | |
2041 | int lttng_consumer_get_consumed_snapshot(struct lttng_consumer_stream *stream, | |
2042 | unsigned long *pos) | |
2043 | { | |
2044 | switch (consumer_data.type) { | |
2045 | case LTTNG_CONSUMER_KERNEL: | |
2046 | return lttng_kconsumer_get_consumed_snapshot(stream, pos); | |
2047 | case LTTNG_CONSUMER32_UST: | |
2048 | case LTTNG_CONSUMER64_UST: | |
2049 | return lttng_ustconsumer_get_consumed_snapshot(stream, pos); | |
2050 | default: | |
2051 | ERR("Unknown consumer_data type"); | |
2052 | assert(0); | |
2053 | return -ENOSYS; | |
2054 | } | |
2055 | } | |
2056 | ||
3bd1e081 MD |
2057 | int lttng_consumer_recv_cmd(struct lttng_consumer_local_data *ctx, |
2058 | int sock, struct pollfd *consumer_sockpoll) | |
2059 | { | |
2060 | switch (consumer_data.type) { | |
2061 | case LTTNG_CONSUMER_KERNEL: | |
2062 | return lttng_kconsumer_recv_cmd(ctx, sock, consumer_sockpoll); | |
7753dea8 MD |
2063 | case LTTNG_CONSUMER32_UST: |
2064 | case LTTNG_CONSUMER64_UST: | |
3bd1e081 MD |
2065 | return lttng_ustconsumer_recv_cmd(ctx, sock, consumer_sockpoll); |
2066 | default: | |
2067 | ERR("Unknown consumer_data type"); | |
2068 | assert(0); | |
2069 | return -ENOSYS; | |
2070 | } | |
2071 | } | |
2072 | ||
6d574024 | 2073 | void lttng_consumer_close_all_metadata(void) |
d88aee68 DG |
2074 | { |
2075 | switch (consumer_data.type) { | |
2076 | case LTTNG_CONSUMER_KERNEL: | |
2077 | /* | |
2078 | * The Kernel consumer has a different metadata scheme so we don't | |
2079 | * close anything because the stream will be closed by the session | |
2080 | * daemon. | |
2081 | */ | |
2082 | break; | |
2083 | case LTTNG_CONSUMER32_UST: | |
2084 | case LTTNG_CONSUMER64_UST: | |
2085 | /* | |
2086 | * Close all metadata streams. The metadata hash table is passed and | |
2087 | * this call iterates over it by closing all wakeup fd. This is safe | |
2088 | * because at this point we are sure that the metadata producer is | |
2089 | * either dead or blocked. | |
2090 | */ | |
6d574024 | 2091 | lttng_ustconsumer_close_all_metadata(metadata_ht); |
d88aee68 DG |
2092 | break; |
2093 | default: | |
2094 | ERR("Unknown consumer_data type"); | |
2095 | assert(0); | |
2096 | } | |
2097 | } | |
2098 | ||
fb3a43a9 DG |
2099 | /* |
2100 | * Clean up a metadata stream and free its memory. | |
2101 | */ | |
e316aad5 DG |
2102 | void consumer_del_metadata_stream(struct lttng_consumer_stream *stream, |
2103 | struct lttng_ht *ht) | |
fb3a43a9 | 2104 | { |
e316aad5 | 2105 | struct lttng_consumer_channel *free_chan = NULL; |
fb3a43a9 DG |
2106 | |
2107 | assert(stream); | |
2108 | /* | |
2109 | * This call should NEVER receive regular stream. It must always be | |
2110 | * metadata stream and this is crucial for data structure synchronization. | |
2111 | */ | |
2112 | assert(stream->metadata_flag); | |
2113 | ||
e316aad5 DG |
2114 | DBG3("Consumer delete metadata stream %d", stream->wait_fd); |
2115 | ||
74251bb8 | 2116 | pthread_mutex_lock(&consumer_data.lock); |
fb549e7a | 2117 | pthread_mutex_lock(&stream->chan->lock); |
3dad2c0f | 2118 | pthread_mutex_lock(&stream->lock); |
081424af JG |
2119 | if (stream->chan->metadata_cache) { |
2120 | /* Only applicable to userspace consumers. */ | |
2121 | pthread_mutex_lock(&stream->chan->metadata_cache->lock); | |
2122 | } | |
8994307f | 2123 | |
6d574024 DG |
2124 | /* Remove any reference to that stream. */ |
2125 | consumer_stream_delete(stream, ht); | |
ca22feea | 2126 | |
6d574024 DG |
2127 | /* Close down everything including the relayd if one. */ |
2128 | consumer_stream_close(stream); | |
2129 | /* Destroy tracer buffers of the stream. */ | |
2130 | consumer_stream_destroy_buffers(stream); | |
fb3a43a9 DG |
2131 | |
2132 | /* Atomically decrement channel refcount since other threads can use it. */ | |
f2ad556d | 2133 | if (!uatomic_sub_return(&stream->chan->refcount, 1) |
ffe60014 | 2134 | && !uatomic_read(&stream->chan->nb_init_stream_left)) { |
c30aaa51 | 2135 | /* Go for channel deletion! */ |
e316aad5 | 2136 | free_chan = stream->chan; |
fb3a43a9 DG |
2137 | } |
2138 | ||
73811ecc DG |
2139 | /* |
2140 | * Nullify the stream reference so it is not used after deletion. The | |
6d574024 DG |
2141 | * channel lock MUST be acquired before being able to check for a NULL |
2142 | * pointer value. | |
73811ecc DG |
2143 | */ |
2144 | stream->chan->metadata_stream = NULL; | |
2145 | ||
081424af JG |
2146 | if (stream->chan->metadata_cache) { |
2147 | pthread_mutex_unlock(&stream->chan->metadata_cache->lock); | |
2148 | } | |
3dad2c0f | 2149 | pthread_mutex_unlock(&stream->lock); |
fb549e7a | 2150 | pthread_mutex_unlock(&stream->chan->lock); |
74251bb8 | 2151 | pthread_mutex_unlock(&consumer_data.lock); |
e316aad5 DG |
2152 | |
2153 | if (free_chan) { | |
2154 | consumer_del_channel(free_chan); | |
2155 | } | |
2156 | ||
6d574024 | 2157 | consumer_stream_free(stream); |
fb3a43a9 DG |
2158 | } |
2159 | ||
2160 | /* | |
2161 | * Action done with the metadata stream when adding it to the consumer internal | |
2162 | * data structures to handle it. | |
2163 | */ | |
66d583dc | 2164 | void consumer_add_metadata_stream(struct lttng_consumer_stream *stream) |
fb3a43a9 | 2165 | { |
5ab66908 | 2166 | struct lttng_ht *ht = metadata_ht; |
76082088 | 2167 | struct lttng_ht_iter iter; |
d88aee68 | 2168 | struct lttng_ht_node_u64 *node; |
fb3a43a9 | 2169 | |
e316aad5 DG |
2170 | assert(stream); |
2171 | assert(ht); | |
2172 | ||
d88aee68 | 2173 | DBG3("Adding metadata stream %" PRIu64 " to hash table", stream->key); |
e316aad5 DG |
2174 | |
2175 | pthread_mutex_lock(&consumer_data.lock); | |
a9838785 | 2176 | pthread_mutex_lock(&stream->chan->lock); |
ec6ea7d0 | 2177 | pthread_mutex_lock(&stream->chan->timer_lock); |
2e818a6a | 2178 | pthread_mutex_lock(&stream->lock); |
e316aad5 | 2179 | |
e316aad5 DG |
2180 | /* |
2181 | * From here, refcounts are updated so be _careful_ when returning an error | |
2182 | * after this point. | |
2183 | */ | |
2184 | ||
fb3a43a9 | 2185 | rcu_read_lock(); |
76082088 DG |
2186 | |
2187 | /* | |
2188 | * Lookup the stream just to make sure it does not exist in our internal | |
2189 | * state. This should NEVER happen. | |
2190 | */ | |
d88aee68 DG |
2191 | lttng_ht_lookup(ht, &stream->key, &iter); |
2192 | node = lttng_ht_iter_get_node_u64(&iter); | |
76082088 DG |
2193 | assert(!node); |
2194 | ||
e316aad5 | 2195 | /* |
ffe60014 DG |
2196 | * When nb_init_stream_left reaches 0, we don't need to trigger any action |
2197 | * in terms of destroying the associated channel, because the action that | |
e316aad5 DG |
2198 | * causes the count to become 0 also causes a stream to be added. The |
2199 | * channel deletion will thus be triggered by the following removal of this | |
2200 | * stream. | |
2201 | */ | |
ffe60014 | 2202 | if (uatomic_read(&stream->chan->nb_init_stream_left) > 0) { |
f2ad556d MD |
2203 | /* Increment refcount before decrementing nb_init_stream_left */ |
2204 | cmm_smp_wmb(); | |
ffe60014 | 2205 | uatomic_dec(&stream->chan->nb_init_stream_left); |
e316aad5 DG |
2206 | } |
2207 | ||
d88aee68 | 2208 | lttng_ht_add_unique_u64(ht, &stream->node); |
ca22feea | 2209 | |
446156b4 | 2210 | lttng_ht_add_u64(consumer_data.stream_per_chan_id_ht, |
d8ef542d MD |
2211 | &stream->node_channel_id); |
2212 | ||
ca22feea DG |
2213 | /* |
2214 | * Add stream to the stream_list_ht of the consumer data. No need to steal | |
2215 | * the key since the HT does not use it and we allow to add redundant keys | |
2216 | * into this table. | |
2217 | */ | |
d88aee68 | 2218 | lttng_ht_add_u64(consumer_data.stream_list_ht, &stream->node_session_id); |
ca22feea | 2219 | |
fb3a43a9 | 2220 | rcu_read_unlock(); |
e316aad5 | 2221 | |
2e818a6a | 2222 | pthread_mutex_unlock(&stream->lock); |
a9838785 | 2223 | pthread_mutex_unlock(&stream->chan->lock); |
ec6ea7d0 | 2224 | pthread_mutex_unlock(&stream->chan->timer_lock); |
e316aad5 | 2225 | pthread_mutex_unlock(&consumer_data.lock); |
fb3a43a9 DG |
2226 | } |
2227 | ||
8994307f DG |
2228 | /* |
2229 | * Delete data stream that are flagged for deletion (endpoint_status). | |
2230 | */ | |
2231 | static void validate_endpoint_status_data_stream(void) | |
2232 | { | |
2233 | struct lttng_ht_iter iter; | |
2234 | struct lttng_consumer_stream *stream; | |
2235 | ||
2236 | DBG("Consumer delete flagged data stream"); | |
2237 | ||
2238 | rcu_read_lock(); | |
2239 | cds_lfht_for_each_entry(data_ht->ht, &iter.iter, stream, node.node) { | |
2240 | /* Validate delete flag of the stream */ | |
79d4ffb7 | 2241 | if (stream->endpoint_status == CONSUMER_ENDPOINT_ACTIVE) { |
8994307f DG |
2242 | continue; |
2243 | } | |
2244 | /* Delete it right now */ | |
2245 | consumer_del_stream(stream, data_ht); | |
2246 | } | |
2247 | rcu_read_unlock(); | |
2248 | } | |
2249 | ||
2250 | /* | |
2251 | * Delete metadata stream that are flagged for deletion (endpoint_status). | |
2252 | */ | |
2253 | static void validate_endpoint_status_metadata_stream( | |
2254 | struct lttng_poll_event *pollset) | |
2255 | { | |
2256 | struct lttng_ht_iter iter; | |
2257 | struct lttng_consumer_stream *stream; | |
2258 | ||
2259 | DBG("Consumer delete flagged metadata stream"); | |
2260 | ||
2261 | assert(pollset); | |
2262 | ||
2263 | rcu_read_lock(); | |
2264 | cds_lfht_for_each_entry(metadata_ht->ht, &iter.iter, stream, node.node) { | |
2265 | /* Validate delete flag of the stream */ | |
79d4ffb7 | 2266 | if (stream->endpoint_status == CONSUMER_ENDPOINT_ACTIVE) { |
8994307f DG |
2267 | continue; |
2268 | } | |
2269 | /* | |
2270 | * Remove from pollset so the metadata thread can continue without | |
2271 | * blocking on a deleted stream. | |
2272 | */ | |
2273 | lttng_poll_del(pollset, stream->wait_fd); | |
2274 | ||
2275 | /* Delete it right now */ | |
2276 | consumer_del_metadata_stream(stream, metadata_ht); | |
2277 | } | |
2278 | rcu_read_unlock(); | |
2279 | } | |
2280 | ||
d73bf3d7 JD |
2281 | static |
2282 | int rotate_notify_sessiond(struct lttng_consumer_local_data *ctx, | |
2283 | uint64_t key) | |
2284 | { | |
2285 | ssize_t ret; | |
2286 | ||
2287 | do { | |
2288 | ret = write(ctx->channel_rotate_pipe, &key, sizeof(key)); | |
2289 | } while (ret == -1 && errno == EINTR); | |
2290 | if (ret == -1) { | |
2291 | PERROR("Failed to write to the channel rotation pipe"); | |
2292 | } else { | |
2293 | DBG("Sent channel rotation notification for channel key %" | |
2294 | PRIu64, key); | |
2295 | ret = 0; | |
2296 | } | |
2297 | ||
2298 | return (int) ret; | |
2299 | } | |
2300 | ||
2301 | /* | |
2302 | * Perform operations that need to be done after a stream has | |
2303 | * rotated and released the stream lock. | |
2304 | * | |
2305 | * Multiple rotations cannot occur simultaneously, so we know the state of the | |
2306 | * "rotated" stream flag cannot change. | |
2307 | * | |
2308 | * This MUST be called WITHOUT the stream lock held. | |
2309 | */ | |
2310 | static | |
2311 | int consumer_post_rotation(struct lttng_consumer_stream *stream, | |
2312 | struct lttng_consumer_local_data *ctx) | |
2313 | { | |
2314 | int ret = 0; | |
2315 | ||
2316 | pthread_mutex_lock(&stream->chan->lock); | |
2317 | ||
2318 | switch (consumer_data.type) { | |
2319 | case LTTNG_CONSUMER_KERNEL: | |
2320 | break; | |
2321 | case LTTNG_CONSUMER32_UST: | |
2322 | case LTTNG_CONSUMER64_UST: | |
2323 | /* | |
2324 | * The ust_metadata_pushed counter has been reset to 0, so now | |
2325 | * we can wakeup the metadata thread so it dumps the metadata | |
2326 | * cache to the new file. | |
2327 | */ | |
2328 | if (stream->metadata_flag) { | |
2329 | consumer_metadata_wakeup_pipe(stream->chan); | |
2330 | } | |
2331 | break; | |
2332 | default: | |
2333 | ERR("Unknown consumer_data type"); | |
2334 | abort(); | |
2335 | } | |
2336 | ||
2337 | if (--stream->chan->nr_stream_rotate_pending == 0) { | |
2338 | DBG("Rotation of channel \"%s\" completed, notifying the session daemon", | |
2339 | stream->chan->name); | |
2340 | ret = rotate_notify_sessiond(ctx, stream->chan->key); | |
2341 | } | |
2342 | assert(stream->chan->nr_stream_rotate_pending >= 0); | |
2343 | pthread_mutex_unlock(&stream->chan->lock); | |
2344 | ||
2345 | return ret; | |
2346 | } | |
2347 | ||
fb3a43a9 DG |
2348 | /* |
2349 | * Thread polls on metadata file descriptor and write them on disk or on the | |
2350 | * network. | |
2351 | */ | |
7d980def | 2352 | void *consumer_thread_metadata_poll(void *data) |
fb3a43a9 | 2353 | { |
1fc79fb4 | 2354 | int ret, i, pollfd, err = -1; |
fb3a43a9 | 2355 | uint32_t revents, nb_fd; |
e316aad5 | 2356 | struct lttng_consumer_stream *stream = NULL; |
fb3a43a9 | 2357 | struct lttng_ht_iter iter; |
d88aee68 | 2358 | struct lttng_ht_node_u64 *node; |
fb3a43a9 DG |
2359 | struct lttng_poll_event events; |
2360 | struct lttng_consumer_local_data *ctx = data; | |
2361 | ssize_t len; | |
2362 | ||
2363 | rcu_register_thread(); | |
2364 | ||
1fc79fb4 MD |
2365 | health_register(health_consumerd, HEALTH_CONSUMERD_TYPE_METADATA); |
2366 | ||
2d57de81 MD |
2367 | if (testpoint(consumerd_thread_metadata)) { |
2368 | goto error_testpoint; | |
2369 | } | |
2370 | ||
9ce5646a MD |
2371 | health_code_update(); |
2372 | ||
fb3a43a9 DG |
2373 | DBG("Thread metadata poll started"); |
2374 | ||
fb3a43a9 DG |
2375 | /* Size is set to 1 for the consumer_metadata pipe */ |
2376 | ret = lttng_poll_create(&events, 2, LTTNG_CLOEXEC); | |
2377 | if (ret < 0) { | |
2378 | ERR("Poll set creation failed"); | |
d8ef542d | 2379 | goto end_poll; |
fb3a43a9 DG |
2380 | } |
2381 | ||
13886d2d DG |
2382 | ret = lttng_poll_add(&events, |
2383 | lttng_pipe_get_readfd(ctx->consumer_metadata_pipe), LPOLLIN); | |
fb3a43a9 DG |
2384 | if (ret < 0) { |
2385 | goto end; | |
2386 | } | |
2387 | ||
2388 | /* Main loop */ | |
2389 | DBG("Metadata main loop started"); | |
2390 | ||
2391 | while (1) { | |
fb3a43a9 | 2392 | restart: |
7fa2082e | 2393 | health_code_update(); |
9ce5646a | 2394 | health_poll_entry(); |
7fa2082e | 2395 | DBG("Metadata poll wait"); |
fb3a43a9 | 2396 | ret = lttng_poll_wait(&events, -1); |
7fa2082e MD |
2397 | DBG("Metadata poll return from wait with %d fd(s)", |
2398 | LTTNG_POLL_GETNB(&events)); | |
9ce5646a | 2399 | health_poll_exit(); |
40063ead | 2400 | DBG("Metadata event caught in thread"); |
fb3a43a9 DG |
2401 | if (ret < 0) { |
2402 | if (errno == EINTR) { | |
40063ead | 2403 | ERR("Poll EINTR caught"); |
fb3a43a9 DG |
2404 | goto restart; |
2405 | } | |
d9607cd7 MD |
2406 | if (LTTNG_POLL_GETNB(&events) == 0) { |
2407 | err = 0; /* All is OK */ | |
2408 | } | |
2409 | goto end; | |
fb3a43a9 DG |
2410 | } |
2411 | ||
0d9c5d77 DG |
2412 | nb_fd = ret; |
2413 | ||
e316aad5 | 2414 | /* From here, the event is a metadata wait fd */ |
fb3a43a9 | 2415 | for (i = 0; i < nb_fd; i++) { |
9ce5646a MD |
2416 | health_code_update(); |
2417 | ||
fb3a43a9 DG |
2418 | revents = LTTNG_POLL_GETEV(&events, i); |
2419 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
2420 | ||
fd20dac9 MD |
2421 | if (!revents) { |
2422 | /* No activity for this FD (poll implementation). */ | |
2423 | continue; | |
2424 | } | |
2425 | ||
13886d2d | 2426 | if (pollfd == lttng_pipe_get_readfd(ctx->consumer_metadata_pipe)) { |
03e43155 | 2427 | if (revents & LPOLLIN) { |
13886d2d DG |
2428 | ssize_t pipe_len; |
2429 | ||
2430 | pipe_len = lttng_pipe_read(ctx->consumer_metadata_pipe, | |
2431 | &stream, sizeof(stream)); | |
6cd525e8 | 2432 | if (pipe_len < sizeof(stream)) { |
03e43155 MD |
2433 | if (pipe_len < 0) { |
2434 | PERROR("read metadata stream"); | |
2435 | } | |
fb3a43a9 | 2436 | /* |
03e43155 MD |
2437 | * Remove the pipe from the poll set and continue the loop |
2438 | * since their might be data to consume. | |
fb3a43a9 | 2439 | */ |
03e43155 MD |
2440 | lttng_poll_del(&events, |
2441 | lttng_pipe_get_readfd(ctx->consumer_metadata_pipe)); | |
2442 | lttng_pipe_read_close(ctx->consumer_metadata_pipe); | |
fb3a43a9 DG |
2443 | continue; |
2444 | } | |
2445 | ||
8994307f DG |
2446 | /* A NULL stream means that the state has changed. */ |
2447 | if (stream == NULL) { | |
2448 | /* Check for deleted streams. */ | |
2449 | validate_endpoint_status_metadata_stream(&events); | |
3714380f | 2450 | goto restart; |
8994307f DG |
2451 | } |
2452 | ||
fb3a43a9 DG |
2453 | DBG("Adding metadata stream %d to poll set", |
2454 | stream->wait_fd); | |
2455 | ||
fb3a43a9 DG |
2456 | /* Add metadata stream to the global poll events list */ |
2457 | lttng_poll_add(&events, stream->wait_fd, | |
6d574024 | 2458 | LPOLLIN | LPOLLPRI | LPOLLHUP); |
03e43155 MD |
2459 | } else if (revents & (LPOLLERR | LPOLLHUP)) { |
2460 | DBG("Metadata thread pipe hung up"); | |
2461 | /* | |
2462 | * Remove the pipe from the poll set and continue the loop | |
2463 | * since their might be data to consume. | |
2464 | */ | |
2465 | lttng_poll_del(&events, | |
2466 | lttng_pipe_get_readfd(ctx->consumer_metadata_pipe)); | |
2467 | lttng_pipe_read_close(ctx->consumer_metadata_pipe); | |
2468 | continue; | |
2469 | } else { | |
2470 | ERR("Unexpected poll events %u for sock %d", revents, pollfd); | |
2471 | goto end; | |
fb3a43a9 DG |
2472 | } |
2473 | ||
e316aad5 | 2474 | /* Handle other stream */ |
fb3a43a9 DG |
2475 | continue; |
2476 | } | |
2477 | ||
d09e1200 | 2478 | rcu_read_lock(); |
d88aee68 DG |
2479 | { |
2480 | uint64_t tmp_id = (uint64_t) pollfd; | |
2481 | ||
2482 | lttng_ht_lookup(metadata_ht, &tmp_id, &iter); | |
2483 | } | |
2484 | node = lttng_ht_iter_get_node_u64(&iter); | |
e316aad5 | 2485 | assert(node); |
fb3a43a9 DG |
2486 | |
2487 | stream = caa_container_of(node, struct lttng_consumer_stream, | |
58b1f425 | 2488 | node); |
fb3a43a9 | 2489 | |
03e43155 MD |
2490 | if (revents & (LPOLLIN | LPOLLPRI)) { |
2491 | /* Get the data out of the metadata file descriptor */ | |
2492 | DBG("Metadata available on fd %d", pollfd); | |
2493 | assert(stream->wait_fd == pollfd); | |
2494 | ||
2495 | do { | |
2496 | health_code_update(); | |
2497 | ||
2498 | len = ctx->on_buffer_ready(stream, ctx); | |
2499 | /* | |
2500 | * We don't check the return value here since if we get | |
83f4233d | 2501 | * a negative len, it means an error occurred thus we |
03e43155 MD |
2502 | * simply remove it from the poll set and free the |
2503 | * stream. | |
2504 | */ | |
2505 | } while (len > 0); | |
2506 | ||
2507 | /* It's ok to have an unavailable sub-buffer */ | |
2508 | if (len < 0 && len != -EAGAIN && len != -ENODATA) { | |
2509 | /* Clean up stream from consumer and free it. */ | |
2510 | lttng_poll_del(&events, stream->wait_fd); | |
2511 | consumer_del_metadata_stream(stream, metadata_ht); | |
2512 | } | |
2513 | } else if (revents & (LPOLLERR | LPOLLHUP)) { | |
e316aad5 | 2514 | DBG("Metadata fd %d is hup|err.", pollfd); |
fb3a43a9 DG |
2515 | if (!stream->hangup_flush_done |
2516 | && (consumer_data.type == LTTNG_CONSUMER32_UST | |
2517 | || consumer_data.type == LTTNG_CONSUMER64_UST)) { | |
2518 | DBG("Attempting to flush and consume the UST buffers"); | |
2519 | lttng_ustconsumer_on_stream_hangup(stream); | |
2520 | ||
2521 | /* We just flushed the stream now read it. */ | |
4bb94b75 | 2522 | do { |
9ce5646a MD |
2523 | health_code_update(); |
2524 | ||
4bb94b75 DG |
2525 | len = ctx->on_buffer_ready(stream, ctx); |
2526 | /* | |
2527 | * We don't check the return value here since if we get | |
83f4233d | 2528 | * a negative len, it means an error occurred thus we |
4bb94b75 DG |
2529 | * simply remove it from the poll set and free the |
2530 | * stream. | |
2531 | */ | |
2532 | } while (len > 0); | |
fb3a43a9 DG |
2533 | } |
2534 | ||
fb3a43a9 | 2535 | lttng_poll_del(&events, stream->wait_fd); |
e316aad5 DG |
2536 | /* |
2537 | * This call update the channel states, closes file descriptors | |
2538 | * and securely free the stream. | |
2539 | */ | |
2540 | consumer_del_metadata_stream(stream, metadata_ht); | |
03e43155 MD |
2541 | } else { |
2542 | ERR("Unexpected poll events %u for sock %d", revents, pollfd); | |
6f2f1a70 | 2543 | rcu_read_unlock(); |
03e43155 | 2544 | goto end; |
fb3a43a9 | 2545 | } |
e316aad5 | 2546 | /* Release RCU lock for the stream looked up */ |
d09e1200 | 2547 | rcu_read_unlock(); |
fb3a43a9 DG |
2548 | } |
2549 | } | |
2550 | ||
1fc79fb4 MD |
2551 | /* All is OK */ |
2552 | err = 0; | |
fb3a43a9 DG |
2553 | end: |
2554 | DBG("Metadata poll thread exiting"); | |
fb3a43a9 | 2555 | |
d8ef542d MD |
2556 | lttng_poll_clean(&events); |
2557 | end_poll: | |
2d57de81 | 2558 | error_testpoint: |
1fc79fb4 MD |
2559 | if (err) { |
2560 | health_error(); | |
2561 | ERR("Health error occurred in %s", __func__); | |
2562 | } | |
2563 | health_unregister(health_consumerd); | |
fb3a43a9 DG |
2564 | rcu_unregister_thread(); |
2565 | return NULL; | |
2566 | } | |
2567 | ||
3bd1e081 | 2568 | /* |
e4421fec | 2569 | * This thread polls the fds in the set to consume the data and write |
3bd1e081 MD |
2570 | * it to tracefile if necessary. |
2571 | */ | |
7d980def | 2572 | void *consumer_thread_data_poll(void *data) |
3bd1e081 | 2573 | { |
1fc79fb4 | 2574 | int num_rdy, num_hup, high_prio, ret, i, err = -1; |
3bd1e081 MD |
2575 | struct pollfd *pollfd = NULL; |
2576 | /* local view of the streams */ | |
c869f647 | 2577 | struct lttng_consumer_stream **local_stream = NULL, *new_stream = NULL; |
3bd1e081 | 2578 | /* local view of consumer_data.fds_count */ |
261de637 | 2579 | int nb_fd = 0, nb_pipes_fd; |
9a2fcf78 JD |
2580 | /* Number of FDs with CONSUMER_ENDPOINT_INACTIVE but still open. */ |
2581 | int nb_inactive_fd = 0; | |
3bd1e081 | 2582 | struct lttng_consumer_local_data *ctx = data; |
00e2e675 | 2583 | ssize_t len; |
3bd1e081 | 2584 | |
e7b994a3 DG |
2585 | rcu_register_thread(); |
2586 | ||
1fc79fb4 MD |
2587 | health_register(health_consumerd, HEALTH_CONSUMERD_TYPE_DATA); |
2588 | ||
2d57de81 MD |
2589 | if (testpoint(consumerd_thread_data)) { |
2590 | goto error_testpoint; | |
2591 | } | |
2592 | ||
9ce5646a MD |
2593 | health_code_update(); |
2594 | ||
4df6c8cb MD |
2595 | local_stream = zmalloc(sizeof(struct lttng_consumer_stream *)); |
2596 | if (local_stream == NULL) { | |
2597 | PERROR("local_stream malloc"); | |
2598 | goto end; | |
2599 | } | |
3bd1e081 MD |
2600 | |
2601 | while (1) { | |
9ce5646a MD |
2602 | health_code_update(); |
2603 | ||
3bd1e081 MD |
2604 | high_prio = 0; |
2605 | num_hup = 0; | |
2606 | ||
2607 | /* | |
e4421fec | 2608 | * the fds set has been updated, we need to update our |
3bd1e081 MD |
2609 | * local array as well |
2610 | */ | |
2611 | pthread_mutex_lock(&consumer_data.lock); | |
2612 | if (consumer_data.need_update) { | |
0e428499 DG |
2613 | free(pollfd); |
2614 | pollfd = NULL; | |
2615 | ||
2616 | free(local_stream); | |
2617 | local_stream = NULL; | |
3bd1e081 | 2618 | |
02b3d176 | 2619 | /* |
261de637 JD |
2620 | * Allocate for all fds + 2: |
2621 | * +1 for the consumer_data_pipe | |
2622 | * +1 for wake up pipe | |
02b3d176 | 2623 | */ |
261de637 JD |
2624 | nb_pipes_fd = 2; |
2625 | pollfd = zmalloc((consumer_data.stream_count + nb_pipes_fd) * sizeof(struct pollfd)); | |
3bd1e081 | 2626 | if (pollfd == NULL) { |
7a57cf92 | 2627 | PERROR("pollfd malloc"); |
3bd1e081 MD |
2628 | pthread_mutex_unlock(&consumer_data.lock); |
2629 | goto end; | |
2630 | } | |
2631 | ||
261de637 | 2632 | local_stream = zmalloc((consumer_data.stream_count + nb_pipes_fd) * |
747f8642 | 2633 | sizeof(struct lttng_consumer_stream *)); |
3bd1e081 | 2634 | if (local_stream == NULL) { |
7a57cf92 | 2635 | PERROR("local_stream malloc"); |
3bd1e081 MD |
2636 | pthread_mutex_unlock(&consumer_data.lock); |
2637 | goto end; | |
2638 | } | |
ffe60014 | 2639 | ret = update_poll_array(ctx, &pollfd, local_stream, |
9a2fcf78 | 2640 | data_ht, &nb_inactive_fd); |
3bd1e081 MD |
2641 | if (ret < 0) { |
2642 | ERR("Error in allocating pollfd or local_outfds"); | |
f73fabfd | 2643 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_POLL_ERROR); |
3bd1e081 MD |
2644 | pthread_mutex_unlock(&consumer_data.lock); |
2645 | goto end; | |
2646 | } | |
2647 | nb_fd = ret; | |
2648 | consumer_data.need_update = 0; | |
2649 | } | |
2650 | pthread_mutex_unlock(&consumer_data.lock); | |
2651 | ||
4078b776 | 2652 | /* No FDs and consumer_quit, consumer_cleanup the thread */ |
9a2fcf78 JD |
2653 | if (nb_fd == 0 && nb_inactive_fd == 0 && |
2654 | CMM_LOAD_SHARED(consumer_quit) == 1) { | |
1fc79fb4 | 2655 | err = 0; /* All is OK */ |
4078b776 MD |
2656 | goto end; |
2657 | } | |
3bd1e081 | 2658 | /* poll on the array of fds */ |
88f2b785 | 2659 | restart: |
261de637 | 2660 | DBG("polling on %d fd", nb_fd + nb_pipes_fd); |
cf0bcb51 JG |
2661 | if (testpoint(consumerd_thread_data_poll)) { |
2662 | goto end; | |
2663 | } | |
9ce5646a | 2664 | health_poll_entry(); |
261de637 | 2665 | num_rdy = poll(pollfd, nb_fd + nb_pipes_fd, -1); |
9ce5646a | 2666 | health_poll_exit(); |
3bd1e081 MD |
2667 | DBG("poll num_rdy : %d", num_rdy); |
2668 | if (num_rdy == -1) { | |
88f2b785 MD |
2669 | /* |
2670 | * Restart interrupted system call. | |
2671 | */ | |
2672 | if (errno == EINTR) { | |
2673 | goto restart; | |
2674 | } | |
7a57cf92 | 2675 | PERROR("Poll error"); |
f73fabfd | 2676 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_POLL_ERROR); |
3bd1e081 MD |
2677 | goto end; |
2678 | } else if (num_rdy == 0) { | |
2679 | DBG("Polling thread timed out"); | |
2680 | goto end; | |
2681 | } | |
2682 | ||
80957876 JG |
2683 | if (caa_unlikely(data_consumption_paused)) { |
2684 | DBG("Data consumption paused, sleeping..."); | |
2685 | sleep(1); | |
2686 | goto restart; | |
2687 | } | |
2688 | ||
3bd1e081 | 2689 | /* |
50f8ae69 | 2690 | * If the consumer_data_pipe triggered poll go directly to the |
00e2e675 DG |
2691 | * beginning of the loop to update the array. We want to prioritize |
2692 | * array update over low-priority reads. | |
3bd1e081 | 2693 | */ |
509bb1cf | 2694 | if (pollfd[nb_fd].revents & (POLLIN | POLLPRI)) { |
ab30f567 | 2695 | ssize_t pipe_readlen; |
04fdd819 | 2696 | |
50f8ae69 | 2697 | DBG("consumer_data_pipe wake up"); |
acdb9057 DG |
2698 | pipe_readlen = lttng_pipe_read(ctx->consumer_data_pipe, |
2699 | &new_stream, sizeof(new_stream)); | |
6cd525e8 MD |
2700 | if (pipe_readlen < sizeof(new_stream)) { |
2701 | PERROR("Consumer data pipe"); | |
23f5f35d DG |
2702 | /* Continue so we can at least handle the current stream(s). */ |
2703 | continue; | |
2704 | } | |
c869f647 DG |
2705 | |
2706 | /* | |
2707 | * If the stream is NULL, just ignore it. It's also possible that | |
2708 | * the sessiond poll thread changed the consumer_quit state and is | |
2709 | * waking us up to test it. | |
2710 | */ | |
2711 | if (new_stream == NULL) { | |
8994307f | 2712 | validate_endpoint_status_data_stream(); |
c869f647 DG |
2713 | continue; |
2714 | } | |
2715 | ||
c869f647 | 2716 | /* Continue to update the local streams and handle prio ones */ |
3bd1e081 MD |
2717 | continue; |
2718 | } | |
2719 | ||
02b3d176 DG |
2720 | /* Handle wakeup pipe. */ |
2721 | if (pollfd[nb_fd + 1].revents & (POLLIN | POLLPRI)) { | |
2722 | char dummy; | |
2723 | ssize_t pipe_readlen; | |
2724 | ||
2725 | pipe_readlen = lttng_pipe_read(ctx->consumer_wakeup_pipe, &dummy, | |
2726 | sizeof(dummy)); | |
2727 | if (pipe_readlen < 0) { | |
2728 | PERROR("Consumer data wakeup pipe"); | |
2729 | } | |
2730 | /* We've been awakened to handle stream(s). */ | |
2731 | ctx->has_wakeup = 0; | |
2732 | } | |
2733 | ||
3bd1e081 MD |
2734 | /* Take care of high priority channels first. */ |
2735 | for (i = 0; i < nb_fd; i++) { | |
9ce5646a MD |
2736 | health_code_update(); |
2737 | ||
9617607b DG |
2738 | if (local_stream[i] == NULL) { |
2739 | continue; | |
2740 | } | |
fb3a43a9 | 2741 | if (pollfd[i].revents & POLLPRI) { |
d41f73b7 MD |
2742 | DBG("Urgent read on fd %d", pollfd[i].fd); |
2743 | high_prio = 1; | |
4078b776 | 2744 | len = ctx->on_buffer_ready(local_stream[i], ctx); |
d41f73b7 | 2745 | /* it's ok to have an unavailable sub-buffer */ |
b64403e3 | 2746 | if (len < 0 && len != -EAGAIN && len != -ENODATA) { |
ab1027f4 DG |
2747 | /* Clean the stream and free it. */ |
2748 | consumer_del_stream(local_stream[i], data_ht); | |
9617607b | 2749 | local_stream[i] = NULL; |
4078b776 MD |
2750 | } else if (len > 0) { |
2751 | local_stream[i]->data_read = 1; | |
d41f73b7 | 2752 | } |
3bd1e081 MD |
2753 | } |
2754 | } | |
2755 | ||
4078b776 MD |
2756 | /* |
2757 | * If we read high prio channel in this loop, try again | |
2758 | * for more high prio data. | |
2759 | */ | |
2760 | if (high_prio) { | |
3bd1e081 MD |
2761 | continue; |
2762 | } | |
2763 | ||
2764 | /* Take care of low priority channels. */ | |
4078b776 | 2765 | for (i = 0; i < nb_fd; i++) { |
9ce5646a MD |
2766 | health_code_update(); |
2767 | ||
9617607b DG |
2768 | if (local_stream[i] == NULL) { |
2769 | continue; | |
2770 | } | |
4078b776 | 2771 | if ((pollfd[i].revents & POLLIN) || |
02b3d176 DG |
2772 | local_stream[i]->hangup_flush_done || |
2773 | local_stream[i]->has_data) { | |
4078b776 MD |
2774 | DBG("Normal read on fd %d", pollfd[i].fd); |
2775 | len = ctx->on_buffer_ready(local_stream[i], ctx); | |
2776 | /* it's ok to have an unavailable sub-buffer */ | |
b64403e3 | 2777 | if (len < 0 && len != -EAGAIN && len != -ENODATA) { |
ab1027f4 DG |
2778 | /* Clean the stream and free it. */ |
2779 | consumer_del_stream(local_stream[i], data_ht); | |
9617607b | 2780 | local_stream[i] = NULL; |
4078b776 MD |
2781 | } else if (len > 0) { |
2782 | local_stream[i]->data_read = 1; | |
2783 | } | |
2784 | } | |
2785 | } | |
2786 | ||
2787 | /* Handle hangup and errors */ | |
2788 | for (i = 0; i < nb_fd; i++) { | |
9ce5646a MD |
2789 | health_code_update(); |
2790 | ||
9617607b DG |
2791 | if (local_stream[i] == NULL) { |
2792 | continue; | |
2793 | } | |
4078b776 MD |
2794 | if (!local_stream[i]->hangup_flush_done |
2795 | && (pollfd[i].revents & (POLLHUP | POLLERR | POLLNVAL)) | |
2796 | && (consumer_data.type == LTTNG_CONSUMER32_UST | |
2797 | || consumer_data.type == LTTNG_CONSUMER64_UST)) { | |
2798 | DBG("fd %d is hup|err|nval. Attempting flush and read.", | |
9617607b | 2799 | pollfd[i].fd); |
4078b776 MD |
2800 | lttng_ustconsumer_on_stream_hangup(local_stream[i]); |
2801 | /* Attempt read again, for the data we just flushed. */ | |
2802 | local_stream[i]->data_read = 1; | |
2803 | } | |
2804 | /* | |
2805 | * If the poll flag is HUP/ERR/NVAL and we have | |
2806 | * read no data in this pass, we can remove the | |
2807 | * stream from its hash table. | |
2808 | */ | |
2809 | if ((pollfd[i].revents & POLLHUP)) { | |
2810 | DBG("Polling fd %d tells it has hung up.", pollfd[i].fd); | |
2811 | if (!local_stream[i]->data_read) { | |
43c34bc3 | 2812 | consumer_del_stream(local_stream[i], data_ht); |
9617607b | 2813 | local_stream[i] = NULL; |
4078b776 MD |
2814 | num_hup++; |
2815 | } | |
2816 | } else if (pollfd[i].revents & POLLERR) { | |
2817 | ERR("Error returned in polling fd %d.", pollfd[i].fd); | |
2818 | if (!local_stream[i]->data_read) { | |
43c34bc3 | 2819 | consumer_del_stream(local_stream[i], data_ht); |
9617607b | 2820 | local_stream[i] = NULL; |
4078b776 MD |
2821 | num_hup++; |
2822 | } | |
2823 | } else if (pollfd[i].revents & POLLNVAL) { | |
2824 | ERR("Polling fd %d tells fd is not open.", pollfd[i].fd); | |
2825 | if (!local_stream[i]->data_read) { | |
43c34bc3 | 2826 | consumer_del_stream(local_stream[i], data_ht); |
9617607b | 2827 | local_stream[i] = NULL; |
4078b776 | 2828 | num_hup++; |
3bd1e081 MD |
2829 | } |
2830 | } | |
9617607b DG |
2831 | if (local_stream[i] != NULL) { |
2832 | local_stream[i]->data_read = 0; | |
2833 | } | |
3bd1e081 MD |
2834 | } |
2835 | } | |
1fc79fb4 MD |
2836 | /* All is OK */ |
2837 | err = 0; | |
3bd1e081 MD |
2838 | end: |
2839 | DBG("polling thread exiting"); | |
0e428499 DG |
2840 | free(pollfd); |
2841 | free(local_stream); | |
fb3a43a9 DG |
2842 | |
2843 | /* | |
2844 | * Close the write side of the pipe so epoll_wait() in | |
7d980def DG |
2845 | * consumer_thread_metadata_poll can catch it. The thread is monitoring the |
2846 | * read side of the pipe. If we close them both, epoll_wait strangely does | |
2847 | * not return and could create a endless wait period if the pipe is the | |
2848 | * only tracked fd in the poll set. The thread will take care of closing | |
2849 | * the read side. | |
fb3a43a9 | 2850 | */ |
13886d2d | 2851 | (void) lttng_pipe_write_close(ctx->consumer_metadata_pipe); |
fb3a43a9 | 2852 | |
2d57de81 | 2853 | error_testpoint: |
1fc79fb4 MD |
2854 | if (err) { |
2855 | health_error(); | |
2856 | ERR("Health error occurred in %s", __func__); | |
2857 | } | |
2858 | health_unregister(health_consumerd); | |
2859 | ||
e7b994a3 | 2860 | rcu_unregister_thread(); |
3bd1e081 MD |
2861 | return NULL; |
2862 | } | |
2863 | ||
d8ef542d MD |
2864 | /* |
2865 | * Close wake-up end of each stream belonging to the channel. This will | |
2866 | * allow the poll() on the stream read-side to detect when the | |
2867 | * write-side (application) finally closes them. | |
2868 | */ | |
2869 | static | |
2870 | void consumer_close_channel_streams(struct lttng_consumer_channel *channel) | |
2871 | { | |
2872 | struct lttng_ht *ht; | |
2873 | struct lttng_consumer_stream *stream; | |
2874 | struct lttng_ht_iter iter; | |
2875 | ||
2876 | ht = consumer_data.stream_per_chan_id_ht; | |
2877 | ||
2878 | rcu_read_lock(); | |
2879 | cds_lfht_for_each_entry_duplicate(ht->ht, | |
2880 | ht->hash_fct(&channel->key, lttng_ht_seed), | |
2881 | ht->match_fct, &channel->key, | |
2882 | &iter.iter, stream, node_channel_id.node) { | |
f2ad556d MD |
2883 | /* |
2884 | * Protect against teardown with mutex. | |
2885 | */ | |
2886 | pthread_mutex_lock(&stream->lock); | |
2887 | if (cds_lfht_is_node_deleted(&stream->node.node)) { | |
2888 | goto next; | |
2889 | } | |
d8ef542d MD |
2890 | switch (consumer_data.type) { |
2891 | case LTTNG_CONSUMER_KERNEL: | |
2892 | break; | |
2893 | case LTTNG_CONSUMER32_UST: | |
2894 | case LTTNG_CONSUMER64_UST: | |
b4a650f3 DG |
2895 | if (stream->metadata_flag) { |
2896 | /* Safe and protected by the stream lock. */ | |
2897 | lttng_ustconsumer_close_metadata(stream->chan); | |
2898 | } else { | |
2899 | /* | |
2900 | * Note: a mutex is taken internally within | |
2901 | * liblttng-ust-ctl to protect timer wakeup_fd | |
2902 | * use from concurrent close. | |
2903 | */ | |
2904 | lttng_ustconsumer_close_stream_wakeup(stream); | |
2905 | } | |
d8ef542d MD |
2906 | break; |
2907 | default: | |
2908 | ERR("Unknown consumer_data type"); | |
2909 | assert(0); | |
2910 | } | |
f2ad556d MD |
2911 | next: |
2912 | pthread_mutex_unlock(&stream->lock); | |
d8ef542d MD |
2913 | } |
2914 | rcu_read_unlock(); | |
2915 | } | |
2916 | ||
2917 | static void destroy_channel_ht(struct lttng_ht *ht) | |
2918 | { | |
2919 | struct lttng_ht_iter iter; | |
2920 | struct lttng_consumer_channel *channel; | |
2921 | int ret; | |
2922 | ||
2923 | if (ht == NULL) { | |
2924 | return; | |
2925 | } | |
2926 | ||
2927 | rcu_read_lock(); | |
2928 | cds_lfht_for_each_entry(ht->ht, &iter.iter, channel, wait_fd_node.node) { | |
2929 | ret = lttng_ht_del(ht, &iter); | |
2930 | assert(ret != 0); | |
2931 | } | |
2932 | rcu_read_unlock(); | |
2933 | ||
2934 | lttng_ht_destroy(ht); | |
2935 | } | |
2936 | ||
2937 | /* | |
2938 | * This thread polls the channel fds to detect when they are being | |
2939 | * closed. It closes all related streams if the channel is detected as | |
2940 | * closed. It is currently only used as a shim layer for UST because the | |
2941 | * consumerd needs to keep the per-stream wakeup end of pipes open for | |
2942 | * periodical flush. | |
2943 | */ | |
2944 | void *consumer_thread_channel_poll(void *data) | |
2945 | { | |
1fc79fb4 | 2946 | int ret, i, pollfd, err = -1; |
d8ef542d MD |
2947 | uint32_t revents, nb_fd; |
2948 | struct lttng_consumer_channel *chan = NULL; | |
2949 | struct lttng_ht_iter iter; | |
2950 | struct lttng_ht_node_u64 *node; | |
2951 | struct lttng_poll_event events; | |
2952 | struct lttng_consumer_local_data *ctx = data; | |
2953 | struct lttng_ht *channel_ht; | |
2954 | ||
2955 | rcu_register_thread(); | |
2956 | ||
1fc79fb4 MD |
2957 | health_register(health_consumerd, HEALTH_CONSUMERD_TYPE_CHANNEL); |
2958 | ||
2d57de81 MD |
2959 | if (testpoint(consumerd_thread_channel)) { |
2960 | goto error_testpoint; | |
2961 | } | |
2962 | ||
9ce5646a MD |
2963 | health_code_update(); |
2964 | ||
d8ef542d MD |
2965 | channel_ht = lttng_ht_new(0, LTTNG_HT_TYPE_U64); |
2966 | if (!channel_ht) { | |
2967 | /* ENOMEM at this point. Better to bail out. */ | |
2968 | goto end_ht; | |
2969 | } | |
2970 | ||
2971 | DBG("Thread channel poll started"); | |
2972 | ||
2973 | /* Size is set to 1 for the consumer_channel pipe */ | |
2974 | ret = lttng_poll_create(&events, 2, LTTNG_CLOEXEC); | |
2975 | if (ret < 0) { | |
2976 | ERR("Poll set creation failed"); | |
2977 | goto end_poll; | |
2978 | } | |
2979 | ||
2980 | ret = lttng_poll_add(&events, ctx->consumer_channel_pipe[0], LPOLLIN); | |
2981 | if (ret < 0) { | |
2982 | goto end; | |
2983 | } | |
2984 | ||
2985 | /* Main loop */ | |
2986 | DBG("Channel main loop started"); | |
2987 | ||
2988 | while (1) { | |
d8ef542d | 2989 | restart: |
7fa2082e MD |
2990 | health_code_update(); |
2991 | DBG("Channel poll wait"); | |
9ce5646a | 2992 | health_poll_entry(); |
d8ef542d | 2993 | ret = lttng_poll_wait(&events, -1); |
7fa2082e MD |
2994 | DBG("Channel poll return from wait with %d fd(s)", |
2995 | LTTNG_POLL_GETNB(&events)); | |
9ce5646a | 2996 | health_poll_exit(); |
40063ead | 2997 | DBG("Channel event caught in thread"); |
d8ef542d MD |
2998 | if (ret < 0) { |
2999 | if (errno == EINTR) { | |
40063ead | 3000 | ERR("Poll EINTR caught"); |
d8ef542d MD |
3001 | goto restart; |
3002 | } | |
d9607cd7 MD |
3003 | if (LTTNG_POLL_GETNB(&events) == 0) { |
3004 | err = 0; /* All is OK */ | |
3005 | } | |
d8ef542d MD |
3006 | goto end; |
3007 | } | |
3008 | ||
3009 | nb_fd = ret; | |
3010 | ||
3011 | /* From here, the event is a channel wait fd */ | |
3012 | for (i = 0; i < nb_fd; i++) { | |
9ce5646a MD |
3013 | health_code_update(); |
3014 | ||
d8ef542d MD |
3015 | revents = LTTNG_POLL_GETEV(&events, i); |
3016 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
3017 | ||
d8ef542d | 3018 | if (!revents) { |
fd20dac9 | 3019 | /* No activity for this FD (poll implementation). */ |
d8ef542d MD |
3020 | continue; |
3021 | } | |
fd20dac9 | 3022 | |
d8ef542d | 3023 | if (pollfd == ctx->consumer_channel_pipe[0]) { |
03e43155 | 3024 | if (revents & LPOLLIN) { |
d8ef542d | 3025 | enum consumer_channel_action action; |
a0cbdd2e | 3026 | uint64_t key; |
d8ef542d | 3027 | |
a0cbdd2e | 3028 | ret = read_channel_pipe(ctx, &chan, &key, &action); |
d8ef542d | 3029 | if (ret <= 0) { |
03e43155 MD |
3030 | if (ret < 0) { |
3031 | ERR("Error reading channel pipe"); | |
3032 | } | |
3033 | lttng_poll_del(&events, ctx->consumer_channel_pipe[0]); | |
d8ef542d MD |
3034 | continue; |
3035 | } | |
3036 | ||
3037 | switch (action) { | |
3038 | case CONSUMER_CHANNEL_ADD: | |
3039 | DBG("Adding channel %d to poll set", | |
3040 | chan->wait_fd); | |
3041 | ||
3042 | lttng_ht_node_init_u64(&chan->wait_fd_node, | |
3043 | chan->wait_fd); | |
c7260a81 | 3044 | rcu_read_lock(); |
d8ef542d MD |
3045 | lttng_ht_add_unique_u64(channel_ht, |
3046 | &chan->wait_fd_node); | |
c7260a81 | 3047 | rcu_read_unlock(); |
d8ef542d MD |
3048 | /* Add channel to the global poll events list */ |
3049 | lttng_poll_add(&events, chan->wait_fd, | |
03e43155 | 3050 | LPOLLERR | LPOLLHUP); |
d8ef542d | 3051 | break; |
a0cbdd2e MD |
3052 | case CONSUMER_CHANNEL_DEL: |
3053 | { | |
b4a650f3 DG |
3054 | /* |
3055 | * This command should never be called if the channel | |
3056 | * has streams monitored by either the data or metadata | |
3057 | * thread. The consumer only notify this thread with a | |
3058 | * channel del. command if it receives a destroy | |
3059 | * channel command from the session daemon that send it | |
3060 | * if a command prior to the GET_CHANNEL failed. | |
3061 | */ | |
3062 | ||
c7260a81 | 3063 | rcu_read_lock(); |
a0cbdd2e MD |
3064 | chan = consumer_find_channel(key); |
3065 | if (!chan) { | |
c7260a81 | 3066 | rcu_read_unlock(); |
a0cbdd2e MD |
3067 | ERR("UST consumer get channel key %" PRIu64 " not found for del channel", key); |
3068 | break; | |
3069 | } | |
3070 | lttng_poll_del(&events, chan->wait_fd); | |
f623cc0b | 3071 | iter.iter.node = &chan->wait_fd_node.node; |
a0cbdd2e MD |
3072 | ret = lttng_ht_del(channel_ht, &iter); |
3073 | assert(ret == 0); | |
a0cbdd2e | 3074 | |
f2a444f1 DG |
3075 | switch (consumer_data.type) { |
3076 | case LTTNG_CONSUMER_KERNEL: | |
3077 | break; | |
3078 | case LTTNG_CONSUMER32_UST: | |
3079 | case LTTNG_CONSUMER64_UST: | |
212d67a2 DG |
3080 | health_code_update(); |
3081 | /* Destroy streams that might have been left in the stream list. */ | |
3082 | clean_channel_stream_list(chan); | |
f2a444f1 DG |
3083 | break; |
3084 | default: | |
3085 | ERR("Unknown consumer_data type"); | |
3086 | assert(0); | |
3087 | } | |
3088 | ||
a0cbdd2e MD |
3089 | /* |
3090 | * Release our own refcount. Force channel deletion even if | |
3091 | * streams were not initialized. | |
3092 | */ | |
3093 | if (!uatomic_sub_return(&chan->refcount, 1)) { | |
3094 | consumer_del_channel(chan); | |
3095 | } | |
c7260a81 | 3096 | rcu_read_unlock(); |
a0cbdd2e MD |
3097 | goto restart; |
3098 | } | |
d8ef542d MD |
3099 | case CONSUMER_CHANNEL_QUIT: |
3100 | /* | |
3101 | * Remove the pipe from the poll set and continue the loop | |
3102 | * since their might be data to consume. | |
3103 | */ | |
3104 | lttng_poll_del(&events, ctx->consumer_channel_pipe[0]); | |
3105 | continue; | |
3106 | default: | |
3107 | ERR("Unknown action"); | |
3108 | break; | |
3109 | } | |
03e43155 MD |
3110 | } else if (revents & (LPOLLERR | LPOLLHUP)) { |
3111 | DBG("Channel thread pipe hung up"); | |
3112 | /* | |
3113 | * Remove the pipe from the poll set and continue the loop | |
3114 | * since their might be data to consume. | |
3115 | */ | |
3116 | lttng_poll_del(&events, ctx->consumer_channel_pipe[0]); | |
3117 | continue; | |
3118 | } else { | |
3119 | ERR("Unexpected poll events %u for sock %d", revents, pollfd); | |
3120 | goto end; | |
d8ef542d MD |
3121 | } |
3122 | ||
3123 | /* Handle other stream */ | |
3124 | continue; | |
3125 | } | |
3126 | ||
3127 | rcu_read_lock(); | |
3128 | { | |
3129 | uint64_t tmp_id = (uint64_t) pollfd; | |
3130 | ||
3131 | lttng_ht_lookup(channel_ht, &tmp_id, &iter); | |
3132 | } | |
3133 | node = lttng_ht_iter_get_node_u64(&iter); | |
3134 | assert(node); | |
3135 | ||
3136 | chan = caa_container_of(node, struct lttng_consumer_channel, | |
3137 | wait_fd_node); | |
3138 | ||
3139 | /* Check for error event */ | |
3140 | if (revents & (LPOLLERR | LPOLLHUP)) { | |
3141 | DBG("Channel fd %d is hup|err.", pollfd); | |
3142 | ||
3143 | lttng_poll_del(&events, chan->wait_fd); | |
3144 | ret = lttng_ht_del(channel_ht, &iter); | |
3145 | assert(ret == 0); | |
b4a650f3 DG |
3146 | |
3147 | /* | |
3148 | * This will close the wait fd for each stream associated to | |
3149 | * this channel AND monitored by the data/metadata thread thus | |
3150 | * will be clean by the right thread. | |
3151 | */ | |
d8ef542d | 3152 | consumer_close_channel_streams(chan); |
f2ad556d MD |
3153 | |
3154 | /* Release our own refcount */ | |
3155 | if (!uatomic_sub_return(&chan->refcount, 1) | |
3156 | && !uatomic_read(&chan->nb_init_stream_left)) { | |
3157 | consumer_del_channel(chan); | |
3158 | } | |
03e43155 MD |
3159 | } else { |
3160 | ERR("Unexpected poll events %u for sock %d", revents, pollfd); | |
3161 | rcu_read_unlock(); | |
3162 | goto end; | |
d8ef542d MD |
3163 | } |
3164 | ||
3165 | /* Release RCU lock for the channel looked up */ | |
3166 | rcu_read_unlock(); | |
3167 | } | |
3168 | } | |
3169 | ||
1fc79fb4 MD |
3170 | /* All is OK */ |
3171 | err = 0; | |
d8ef542d MD |
3172 | end: |
3173 | lttng_poll_clean(&events); | |
3174 | end_poll: | |
3175 | destroy_channel_ht(channel_ht); | |
3176 | end_ht: | |
2d57de81 | 3177 | error_testpoint: |
d8ef542d | 3178 | DBG("Channel poll thread exiting"); |
1fc79fb4 MD |
3179 | if (err) { |
3180 | health_error(); | |
3181 | ERR("Health error occurred in %s", __func__); | |
3182 | } | |
3183 | health_unregister(health_consumerd); | |
d8ef542d MD |
3184 | rcu_unregister_thread(); |
3185 | return NULL; | |
3186 | } | |
3187 | ||
331744e3 JD |
3188 | static int set_metadata_socket(struct lttng_consumer_local_data *ctx, |
3189 | struct pollfd *sockpoll, int client_socket) | |
3190 | { | |
3191 | int ret; | |
3192 | ||
3193 | assert(ctx); | |
3194 | assert(sockpoll); | |
3195 | ||
84382d49 MD |
3196 | ret = lttng_consumer_poll_socket(sockpoll); |
3197 | if (ret) { | |
331744e3 JD |
3198 | goto error; |
3199 | } | |
3200 | DBG("Metadata connection on client_socket"); | |
3201 | ||
3202 | /* Blocking call, waiting for transmission */ | |
3203 | ctx->consumer_metadata_socket = lttcomm_accept_unix_sock(client_socket); | |
3204 | if (ctx->consumer_metadata_socket < 0) { | |
3205 | WARN("On accept metadata"); | |
3206 | ret = -1; | |
3207 | goto error; | |
3208 | } | |
3209 | ret = 0; | |
3210 | ||
3211 | error: | |
3212 | return ret; | |
3213 | } | |
3214 | ||
3bd1e081 MD |
3215 | /* |
3216 | * This thread listens on the consumerd socket and receives the file | |
3217 | * descriptors from the session daemon. | |
3218 | */ | |
7d980def | 3219 | void *consumer_thread_sessiond_poll(void *data) |
3bd1e081 | 3220 | { |
1fc79fb4 | 3221 | int sock = -1, client_socket, ret, err = -1; |
3bd1e081 MD |
3222 | /* |
3223 | * structure to poll for incoming data on communication socket avoids | |
3224 | * making blocking sockets. | |
3225 | */ | |
3226 | struct pollfd consumer_sockpoll[2]; | |
3227 | struct lttng_consumer_local_data *ctx = data; | |
3228 | ||
e7b994a3 DG |
3229 | rcu_register_thread(); |
3230 | ||
1fc79fb4 MD |
3231 | health_register(health_consumerd, HEALTH_CONSUMERD_TYPE_SESSIOND); |
3232 | ||
2d57de81 MD |
3233 | if (testpoint(consumerd_thread_sessiond)) { |
3234 | goto error_testpoint; | |
3235 | } | |
3236 | ||
9ce5646a MD |
3237 | health_code_update(); |
3238 | ||
3bd1e081 MD |
3239 | DBG("Creating command socket %s", ctx->consumer_command_sock_path); |
3240 | unlink(ctx->consumer_command_sock_path); | |
3241 | client_socket = lttcomm_create_unix_sock(ctx->consumer_command_sock_path); | |
3242 | if (client_socket < 0) { | |
3243 | ERR("Cannot create command socket"); | |
3244 | goto end; | |
3245 | } | |
3246 | ||
3247 | ret = lttcomm_listen_unix_sock(client_socket); | |
3248 | if (ret < 0) { | |
3249 | goto end; | |
3250 | } | |
3251 | ||
32258573 | 3252 | DBG("Sending ready command to lttng-sessiond"); |
f73fabfd | 3253 | ret = lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_COMMAND_SOCK_READY); |
3bd1e081 MD |
3254 | /* return < 0 on error, but == 0 is not fatal */ |
3255 | if (ret < 0) { | |
32258573 | 3256 | ERR("Error sending ready command to lttng-sessiond"); |
3bd1e081 MD |
3257 | goto end; |
3258 | } | |
3259 | ||
3bd1e081 MD |
3260 | /* prepare the FDs to poll : to client socket and the should_quit pipe */ |
3261 | consumer_sockpoll[0].fd = ctx->consumer_should_quit[0]; | |
3262 | consumer_sockpoll[0].events = POLLIN | POLLPRI; | |
3263 | consumer_sockpoll[1].fd = client_socket; | |
3264 | consumer_sockpoll[1].events = POLLIN | POLLPRI; | |
3265 | ||
84382d49 MD |
3266 | ret = lttng_consumer_poll_socket(consumer_sockpoll); |
3267 | if (ret) { | |
3268 | if (ret > 0) { | |
3269 | /* should exit */ | |
3270 | err = 0; | |
3271 | } | |
3bd1e081 MD |
3272 | goto end; |
3273 | } | |
3274 | DBG("Connection on client_socket"); | |
3275 | ||
3276 | /* Blocking call, waiting for transmission */ | |
3277 | sock = lttcomm_accept_unix_sock(client_socket); | |
534d2592 | 3278 | if (sock < 0) { |
3bd1e081 MD |
3279 | WARN("On accept"); |
3280 | goto end; | |
3281 | } | |
3bd1e081 | 3282 | |
331744e3 JD |
3283 | /* |
3284 | * Setup metadata socket which is the second socket connection on the | |
3285 | * command unix socket. | |
3286 | */ | |
3287 | ret = set_metadata_socket(ctx, consumer_sockpoll, client_socket); | |
84382d49 MD |
3288 | if (ret) { |
3289 | if (ret > 0) { | |
3290 | /* should exit */ | |
3291 | err = 0; | |
3292 | } | |
331744e3 JD |
3293 | goto end; |
3294 | } | |
3295 | ||
d96f09c6 DG |
3296 | /* This socket is not useful anymore. */ |
3297 | ret = close(client_socket); | |
3298 | if (ret < 0) { | |
3299 | PERROR("close client_socket"); | |
3300 | } | |
3301 | client_socket = -1; | |
3302 | ||
3bd1e081 MD |
3303 | /* update the polling structure to poll on the established socket */ |
3304 | consumer_sockpoll[1].fd = sock; | |
3305 | consumer_sockpoll[1].events = POLLIN | POLLPRI; | |
3306 | ||
3307 | while (1) { | |
9ce5646a MD |
3308 | health_code_update(); |
3309 | ||
3310 | health_poll_entry(); | |
3311 | ret = lttng_consumer_poll_socket(consumer_sockpoll); | |
3312 | health_poll_exit(); | |
84382d49 MD |
3313 | if (ret) { |
3314 | if (ret > 0) { | |
3315 | /* should exit */ | |
3316 | err = 0; | |
3317 | } | |
3bd1e081 MD |
3318 | goto end; |
3319 | } | |
3320 | DBG("Incoming command on sock"); | |
3321 | ret = lttng_consumer_recv_cmd(ctx, sock, consumer_sockpoll); | |
4cbc1a04 DG |
3322 | if (ret <= 0) { |
3323 | /* | |
3324 | * This could simply be a session daemon quitting. Don't output | |
3325 | * ERR() here. | |
3326 | */ | |
3327 | DBG("Communication interrupted on command socket"); | |
41ba6035 | 3328 | err = 0; |
3bd1e081 MD |
3329 | goto end; |
3330 | } | |
10211f5c | 3331 | if (CMM_LOAD_SHARED(consumer_quit)) { |
3bd1e081 | 3332 | DBG("consumer_thread_receive_fds received quit from signal"); |
1fc79fb4 | 3333 | err = 0; /* All is OK */ |
3bd1e081 MD |
3334 | goto end; |
3335 | } | |
ffe60014 | 3336 | DBG("received command on sock"); |
3bd1e081 | 3337 | } |
1fc79fb4 MD |
3338 | /* All is OK */ |
3339 | err = 0; | |
3340 | ||
3bd1e081 | 3341 | end: |
ffe60014 | 3342 | DBG("Consumer thread sessiond poll exiting"); |
3bd1e081 | 3343 | |
d88aee68 DG |
3344 | /* |
3345 | * Close metadata streams since the producer is the session daemon which | |
3346 | * just died. | |
3347 | * | |
3348 | * NOTE: for now, this only applies to the UST tracer. | |
3349 | */ | |
6d574024 | 3350 | lttng_consumer_close_all_metadata(); |
d88aee68 | 3351 | |
3bd1e081 MD |
3352 | /* |
3353 | * when all fds have hung up, the polling thread | |
3354 | * can exit cleanly | |
3355 | */ | |
10211f5c | 3356 | CMM_STORE_SHARED(consumer_quit, 1); |
3bd1e081 | 3357 | |
04fdd819 | 3358 | /* |
c869f647 | 3359 | * Notify the data poll thread to poll back again and test the |
8994307f | 3360 | * consumer_quit state that we just set so to quit gracefully. |
04fdd819 | 3361 | */ |
acdb9057 | 3362 | notify_thread_lttng_pipe(ctx->consumer_data_pipe); |
c869f647 | 3363 | |
a0cbdd2e | 3364 | notify_channel_pipe(ctx, NULL, -1, CONSUMER_CHANNEL_QUIT); |
d8ef542d | 3365 | |
5c635c72 MD |
3366 | notify_health_quit_pipe(health_quit_pipe); |
3367 | ||
d96f09c6 DG |
3368 | /* Cleaning up possibly open sockets. */ |
3369 | if (sock >= 0) { | |
3370 | ret = close(sock); | |
3371 | if (ret < 0) { | |
3372 | PERROR("close sock sessiond poll"); | |
3373 | } | |
3374 | } | |
3375 | if (client_socket >= 0) { | |
38476d24 | 3376 | ret = close(client_socket); |
d96f09c6 DG |
3377 | if (ret < 0) { |
3378 | PERROR("close client_socket sessiond poll"); | |
3379 | } | |
3380 | } | |
3381 | ||
2d57de81 | 3382 | error_testpoint: |
1fc79fb4 MD |
3383 | if (err) { |
3384 | health_error(); | |
3385 | ERR("Health error occurred in %s", __func__); | |
3386 | } | |
3387 | health_unregister(health_consumerd); | |
3388 | ||
e7b994a3 | 3389 | rcu_unregister_thread(); |
3bd1e081 MD |
3390 | return NULL; |
3391 | } | |
d41f73b7 | 3392 | |
4078b776 | 3393 | ssize_t lttng_consumer_read_subbuffer(struct lttng_consumer_stream *stream, |
d41f73b7 MD |
3394 | struct lttng_consumer_local_data *ctx) |
3395 | { | |
74251bb8 | 3396 | ssize_t ret; |
02d02e31 JD |
3397 | int rotate_ret; |
3398 | bool rotated = false; | |
74251bb8 DG |
3399 | |
3400 | pthread_mutex_lock(&stream->lock); | |
94d49140 JD |
3401 | if (stream->metadata_flag) { |
3402 | pthread_mutex_lock(&stream->metadata_rdv_lock); | |
3403 | } | |
74251bb8 | 3404 | |
d41f73b7 MD |
3405 | switch (consumer_data.type) { |
3406 | case LTTNG_CONSUMER_KERNEL: | |
02d02e31 | 3407 | ret = lttng_kconsumer_read_subbuffer(stream, ctx, &rotated); |
74251bb8 | 3408 | break; |
7753dea8 MD |
3409 | case LTTNG_CONSUMER32_UST: |
3410 | case LTTNG_CONSUMER64_UST: | |
02d02e31 | 3411 | ret = lttng_ustconsumer_read_subbuffer(stream, ctx, &rotated); |
74251bb8 | 3412 | break; |
d41f73b7 MD |
3413 | default: |
3414 | ERR("Unknown consumer_data type"); | |
3415 | assert(0); | |
74251bb8 DG |
3416 | ret = -ENOSYS; |
3417 | break; | |
d41f73b7 | 3418 | } |
74251bb8 | 3419 | |
94d49140 JD |
3420 | if (stream->metadata_flag) { |
3421 | pthread_cond_broadcast(&stream->metadata_rdv); | |
3422 | pthread_mutex_unlock(&stream->metadata_rdv_lock); | |
3423 | } | |
74251bb8 | 3424 | pthread_mutex_unlock(&stream->lock); |
02d02e31 JD |
3425 | if (rotated) { |
3426 | rotate_ret = consumer_post_rotation(stream, ctx); | |
3427 | if (rotate_ret < 0) { | |
3428 | ERR("Failed after a rotation"); | |
3429 | ret = -1; | |
3430 | } | |
3431 | } | |
3432 | ||
74251bb8 | 3433 | return ret; |
d41f73b7 MD |
3434 | } |
3435 | ||
3436 | int lttng_consumer_on_recv_stream(struct lttng_consumer_stream *stream) | |
3437 | { | |
3438 | switch (consumer_data.type) { | |
3439 | case LTTNG_CONSUMER_KERNEL: | |
3440 | return lttng_kconsumer_on_recv_stream(stream); | |
7753dea8 MD |
3441 | case LTTNG_CONSUMER32_UST: |
3442 | case LTTNG_CONSUMER64_UST: | |
d41f73b7 MD |
3443 | return lttng_ustconsumer_on_recv_stream(stream); |
3444 | default: | |
3445 | ERR("Unknown consumer_data type"); | |
3446 | assert(0); | |
3447 | return -ENOSYS; | |
3448 | } | |
3449 | } | |
e4421fec DG |
3450 | |
3451 | /* | |
3452 | * Allocate and set consumer data hash tables. | |
3453 | */ | |
282dadbc | 3454 | int lttng_consumer_init(void) |
e4421fec | 3455 | { |
d88aee68 | 3456 | consumer_data.channel_ht = lttng_ht_new(0, LTTNG_HT_TYPE_U64); |
282dadbc MD |
3457 | if (!consumer_data.channel_ht) { |
3458 | goto error; | |
3459 | } | |
3460 | ||
d88aee68 | 3461 | consumer_data.relayd_ht = lttng_ht_new(0, LTTNG_HT_TYPE_U64); |
282dadbc MD |
3462 | if (!consumer_data.relayd_ht) { |
3463 | goto error; | |
3464 | } | |
3465 | ||
d88aee68 | 3466 | consumer_data.stream_list_ht = lttng_ht_new(0, LTTNG_HT_TYPE_U64); |
282dadbc MD |
3467 | if (!consumer_data.stream_list_ht) { |
3468 | goto error; | |
3469 | } | |
3470 | ||
d8ef542d | 3471 | consumer_data.stream_per_chan_id_ht = lttng_ht_new(0, LTTNG_HT_TYPE_U64); |
282dadbc MD |
3472 | if (!consumer_data.stream_per_chan_id_ht) { |
3473 | goto error; | |
3474 | } | |
3475 | ||
3476 | data_ht = lttng_ht_new(0, LTTNG_HT_TYPE_U64); | |
3477 | if (!data_ht) { | |
3478 | goto error; | |
3479 | } | |
3480 | ||
3481 | metadata_ht = lttng_ht_new(0, LTTNG_HT_TYPE_U64); | |
3482 | if (!metadata_ht) { | |
3483 | goto error; | |
3484 | } | |
3485 | ||
3486 | return 0; | |
3487 | ||
3488 | error: | |
3489 | return -1; | |
e4421fec | 3490 | } |
7735ef9e DG |
3491 | |
3492 | /* | |
3493 | * Process the ADD_RELAYD command receive by a consumer. | |
3494 | * | |
3495 | * This will create a relayd socket pair and add it to the relayd hash table. | |
3496 | * The caller MUST acquire a RCU read side lock before calling it. | |
3497 | */ | |
2527bf85 | 3498 | void consumer_add_relayd_socket(uint64_t net_seq_idx, int sock_type, |
7735ef9e | 3499 | struct lttng_consumer_local_data *ctx, int sock, |
6151a90f | 3500 | struct pollfd *consumer_sockpoll, |
d3e2ba59 JD |
3501 | struct lttcomm_relayd_sock *relayd_sock, uint64_t sessiond_id, |
3502 | uint64_t relayd_session_id) | |
7735ef9e | 3503 | { |
cd2b09ed | 3504 | int fd = -1, ret = -1, relayd_created = 0; |
0c759fc9 | 3505 | enum lttcomm_return_code ret_code = LTTCOMM_CONSUMERD_SUCCESS; |
d4298c99 | 3506 | struct consumer_relayd_sock_pair *relayd = NULL; |
7735ef9e | 3507 | |
6151a90f JD |
3508 | assert(ctx); |
3509 | assert(relayd_sock); | |
3510 | ||
da009f2c | 3511 | DBG("Consumer adding relayd socket (idx: %" PRIu64 ")", net_seq_idx); |
7735ef9e DG |
3512 | |
3513 | /* Get relayd reference if exists. */ | |
3514 | relayd = consumer_find_relayd(net_seq_idx); | |
3515 | if (relayd == NULL) { | |
da009f2c | 3516 | assert(sock_type == LTTNG_STREAM_CONTROL); |
7735ef9e DG |
3517 | /* Not found. Allocate one. */ |
3518 | relayd = consumer_allocate_relayd_sock_pair(net_seq_idx); | |
3519 | if (relayd == NULL) { | |
618a6a28 MD |
3520 | ret_code = LTTCOMM_CONSUMERD_ENOMEM; |
3521 | goto error; | |
0d08d75e | 3522 | } else { |
30319bcb | 3523 | relayd->sessiond_session_id = sessiond_id; |
0d08d75e | 3524 | relayd_created = 1; |
7735ef9e | 3525 | } |
0d08d75e DG |
3526 | |
3527 | /* | |
3528 | * This code path MUST continue to the consumer send status message to | |
3529 | * we can notify the session daemon and continue our work without | |
3530 | * killing everything. | |
3531 | */ | |
da009f2c MD |
3532 | } else { |
3533 | /* | |
3534 | * relayd key should never be found for control socket. | |
3535 | */ | |
3536 | assert(sock_type != LTTNG_STREAM_CONTROL); | |
0d08d75e DG |
3537 | } |
3538 | ||
3539 | /* First send a status message before receiving the fds. */ | |
0c759fc9 | 3540 | ret = consumer_send_status_msg(sock, LTTCOMM_CONSUMERD_SUCCESS); |
618a6a28 | 3541 | if (ret < 0) { |
0d08d75e | 3542 | /* Somehow, the session daemon is not responding anymore. */ |
618a6a28 MD |
3543 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_FATAL); |
3544 | goto error_nosignal; | |
7735ef9e DG |
3545 | } |
3546 | ||
3547 | /* Poll on consumer socket. */ | |
84382d49 MD |
3548 | ret = lttng_consumer_poll_socket(consumer_sockpoll); |
3549 | if (ret) { | |
3550 | /* Needing to exit in the middle of a command: error. */ | |
0d08d75e | 3551 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_POLL_ERROR); |
618a6a28 | 3552 | goto error_nosignal; |
7735ef9e DG |
3553 | } |
3554 | ||
3555 | /* Get relayd socket from session daemon */ | |
3556 | ret = lttcomm_recv_fds_unix_sock(sock, &fd, 1); | |
3557 | if (ret != sizeof(fd)) { | |
4028eeb9 | 3558 | fd = -1; /* Just in case it gets set with an invalid value. */ |
0d08d75e DG |
3559 | |
3560 | /* | |
3561 | * Failing to receive FDs might indicate a major problem such as | |
3562 | * reaching a fd limit during the receive where the kernel returns a | |
3563 | * MSG_CTRUNC and fails to cleanup the fd in the queue. Any case, we | |
3564 | * don't take any chances and stop everything. | |
3565 | * | |
3566 | * XXX: Feature request #558 will fix that and avoid this possible | |
3567 | * issue when reaching the fd limit. | |
3568 | */ | |
3569 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_ERROR_RECV_FD); | |
618a6a28 | 3570 | ret_code = LTTCOMM_CONSUMERD_ERROR_RECV_FD; |
f50f23d9 DG |
3571 | goto error; |
3572 | } | |
3573 | ||
7735ef9e DG |
3574 | /* Copy socket information and received FD */ |
3575 | switch (sock_type) { | |
3576 | case LTTNG_STREAM_CONTROL: | |
3577 | /* Copy received lttcomm socket */ | |
6151a90f JD |
3578 | lttcomm_copy_sock(&relayd->control_sock.sock, &relayd_sock->sock); |
3579 | ret = lttcomm_create_sock(&relayd->control_sock.sock); | |
4028eeb9 | 3580 | /* Handle create_sock error. */ |
f66c074c | 3581 | if (ret < 0) { |
618a6a28 | 3582 | ret_code = LTTCOMM_CONSUMERD_ENOMEM; |
4028eeb9 | 3583 | goto error; |
f66c074c | 3584 | } |
da009f2c MD |
3585 | /* |
3586 | * Close the socket created internally by | |
3587 | * lttcomm_create_sock, so we can replace it by the one | |
3588 | * received from sessiond. | |
3589 | */ | |
3590 | if (close(relayd->control_sock.sock.fd)) { | |
3591 | PERROR("close"); | |
3592 | } | |
7735ef9e DG |
3593 | |
3594 | /* Assign new file descriptor */ | |
6151a90f | 3595 | relayd->control_sock.sock.fd = fd; |
4b29f1ce | 3596 | fd = -1; /* For error path */ |
6151a90f JD |
3597 | /* Assign version values. */ |
3598 | relayd->control_sock.major = relayd_sock->major; | |
3599 | relayd->control_sock.minor = relayd_sock->minor; | |
c5b6f4f0 | 3600 | |
d3e2ba59 | 3601 | relayd->relayd_session_id = relayd_session_id; |
c5b6f4f0 | 3602 | |
7735ef9e DG |
3603 | break; |
3604 | case LTTNG_STREAM_DATA: | |
3605 | /* Copy received lttcomm socket */ | |
6151a90f JD |
3606 | lttcomm_copy_sock(&relayd->data_sock.sock, &relayd_sock->sock); |
3607 | ret = lttcomm_create_sock(&relayd->data_sock.sock); | |
4028eeb9 | 3608 | /* Handle create_sock error. */ |
f66c074c | 3609 | if (ret < 0) { |
618a6a28 | 3610 | ret_code = LTTCOMM_CONSUMERD_ENOMEM; |
4028eeb9 | 3611 | goto error; |
f66c074c | 3612 | } |
da009f2c MD |
3613 | /* |
3614 | * Close the socket created internally by | |
3615 | * lttcomm_create_sock, so we can replace it by the one | |
3616 | * received from sessiond. | |
3617 | */ | |
3618 | if (close(relayd->data_sock.sock.fd)) { | |
3619 | PERROR("close"); | |
3620 | } | |
7735ef9e DG |
3621 | |
3622 | /* Assign new file descriptor */ | |
6151a90f | 3623 | relayd->data_sock.sock.fd = fd; |
4b29f1ce | 3624 | fd = -1; /* for eventual error paths */ |
6151a90f JD |
3625 | /* Assign version values. */ |
3626 | relayd->data_sock.major = relayd_sock->major; | |
3627 | relayd->data_sock.minor = relayd_sock->minor; | |
7735ef9e DG |
3628 | break; |
3629 | default: | |
3630 | ERR("Unknown relayd socket type (%d)", sock_type); | |
618a6a28 | 3631 | ret_code = LTTCOMM_CONSUMERD_FATAL; |
7735ef9e DG |
3632 | goto error; |
3633 | } | |
3634 | ||
d88aee68 | 3635 | DBG("Consumer %s socket created successfully with net idx %" PRIu64 " (fd: %d)", |
7735ef9e DG |
3636 | sock_type == LTTNG_STREAM_CONTROL ? "control" : "data", |
3637 | relayd->net_seq_idx, fd); | |
3638 | ||
618a6a28 MD |
3639 | /* We successfully added the socket. Send status back. */ |
3640 | ret = consumer_send_status_msg(sock, ret_code); | |
3641 | if (ret < 0) { | |
3642 | /* Somehow, the session daemon is not responding anymore. */ | |
3643 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_FATAL); | |
3644 | goto error_nosignal; | |
3645 | } | |
3646 | ||
7735ef9e DG |
3647 | /* |
3648 | * Add relayd socket pair to consumer data hashtable. If object already | |
3649 | * exists or on error, the function gracefully returns. | |
3650 | */ | |
d09e1200 | 3651 | add_relayd(relayd); |
7735ef9e DG |
3652 | |
3653 | /* All good! */ | |
2527bf85 | 3654 | return; |
7735ef9e DG |
3655 | |
3656 | error: | |
618a6a28 MD |
3657 | if (consumer_send_status_msg(sock, ret_code) < 0) { |
3658 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_FATAL); | |
3659 | } | |
3660 | ||
3661 | error_nosignal: | |
4028eeb9 DG |
3662 | /* Close received socket if valid. */ |
3663 | if (fd >= 0) { | |
3664 | if (close(fd)) { | |
3665 | PERROR("close received socket"); | |
3666 | } | |
3667 | } | |
cd2b09ed DG |
3668 | |
3669 | if (relayd_created) { | |
cd2b09ed DG |
3670 | free(relayd); |
3671 | } | |
7735ef9e | 3672 | } |
ca22feea | 3673 | |
4e9a4686 DG |
3674 | /* |
3675 | * Try to lock the stream mutex. | |
3676 | * | |
3677 | * On success, 1 is returned else 0 indicating that the mutex is NOT lock. | |
3678 | */ | |
3679 | static int stream_try_lock(struct lttng_consumer_stream *stream) | |
3680 | { | |
3681 | int ret; | |
3682 | ||
3683 | assert(stream); | |
3684 | ||
3685 | /* | |
3686 | * Try to lock the stream mutex. On failure, we know that the stream is | |
3687 | * being used else where hence there is data still being extracted. | |
3688 | */ | |
3689 | ret = pthread_mutex_trylock(&stream->lock); | |
3690 | if (ret) { | |
3691 | /* For both EBUSY and EINVAL error, the mutex is NOT locked. */ | |
3692 | ret = 0; | |
3693 | goto end; | |
3694 | } | |
3695 | ||
3696 | ret = 1; | |
3697 | ||
3698 | end: | |
3699 | return ret; | |
3700 | } | |
3701 | ||
f7079f67 DG |
3702 | /* |
3703 | * Search for a relayd associated to the session id and return the reference. | |
3704 | * | |
3705 | * A rcu read side lock MUST be acquire before calling this function and locked | |
3706 | * until the relayd object is no longer necessary. | |
3707 | */ | |
3708 | static struct consumer_relayd_sock_pair *find_relayd_by_session_id(uint64_t id) | |
3709 | { | |
3710 | struct lttng_ht_iter iter; | |
f7079f67 | 3711 | struct consumer_relayd_sock_pair *relayd = NULL; |
f7079f67 DG |
3712 | |
3713 | /* Iterate over all relayd since they are indexed by net_seq_idx. */ | |
3714 | cds_lfht_for_each_entry(consumer_data.relayd_ht->ht, &iter.iter, relayd, | |
3715 | node.node) { | |
18261bd1 DG |
3716 | /* |
3717 | * Check by sessiond id which is unique here where the relayd session | |
3718 | * id might not be when having multiple relayd. | |
3719 | */ | |
3720 | if (relayd->sessiond_session_id == id) { | |
f7079f67 | 3721 | /* Found the relayd. There can be only one per id. */ |
18261bd1 | 3722 | goto found; |
f7079f67 DG |
3723 | } |
3724 | } | |
3725 | ||
18261bd1 DG |
3726 | return NULL; |
3727 | ||
3728 | found: | |
f7079f67 DG |
3729 | return relayd; |
3730 | } | |
3731 | ||
ca22feea DG |
3732 | /* |
3733 | * Check if for a given session id there is still data needed to be extract | |
3734 | * from the buffers. | |
3735 | * | |
6d805429 | 3736 | * Return 1 if data is pending or else 0 meaning ready to be read. |
ca22feea | 3737 | */ |
6d805429 | 3738 | int consumer_data_pending(uint64_t id) |
ca22feea DG |
3739 | { |
3740 | int ret; | |
3741 | struct lttng_ht_iter iter; | |
3742 | struct lttng_ht *ht; | |
3743 | struct lttng_consumer_stream *stream; | |
f7079f67 | 3744 | struct consumer_relayd_sock_pair *relayd = NULL; |
6d805429 | 3745 | int (*data_pending)(struct lttng_consumer_stream *); |
ca22feea | 3746 | |
6d805429 | 3747 | DBG("Consumer data pending command on session id %" PRIu64, id); |
ca22feea | 3748 | |
6f6eda74 | 3749 | rcu_read_lock(); |
ca22feea DG |
3750 | pthread_mutex_lock(&consumer_data.lock); |
3751 | ||
3752 | switch (consumer_data.type) { | |
3753 | case LTTNG_CONSUMER_KERNEL: | |
6d805429 | 3754 | data_pending = lttng_kconsumer_data_pending; |
ca22feea DG |
3755 | break; |
3756 | case LTTNG_CONSUMER32_UST: | |
3757 | case LTTNG_CONSUMER64_UST: | |
6d805429 | 3758 | data_pending = lttng_ustconsumer_data_pending; |
ca22feea DG |
3759 | break; |
3760 | default: | |
3761 | ERR("Unknown consumer data type"); | |
3762 | assert(0); | |
3763 | } | |
3764 | ||
3765 | /* Ease our life a bit */ | |
3766 | ht = consumer_data.stream_list_ht; | |
3767 | ||
f7079f67 DG |
3768 | relayd = find_relayd_by_session_id(id); |
3769 | if (relayd) { | |
3770 | /* Send init command for data pending. */ | |
3771 | pthread_mutex_lock(&relayd->ctrl_sock_mutex); | |
3772 | ret = relayd_begin_data_pending(&relayd->control_sock, | |
3773 | relayd->relayd_session_id); | |
3774 | pthread_mutex_unlock(&relayd->ctrl_sock_mutex); | |
3775 | if (ret < 0) { | |
3776 | /* Communication error thus the relayd so no data pending. */ | |
3777 | goto data_not_pending; | |
3778 | } | |
3779 | } | |
3780 | ||
c8f59ee5 | 3781 | cds_lfht_for_each_entry_duplicate(ht->ht, |
d88aee68 DG |
3782 | ht->hash_fct(&id, lttng_ht_seed), |
3783 | ht->match_fct, &id, | |
ca22feea | 3784 | &iter.iter, stream, node_session_id.node) { |
4e9a4686 DG |
3785 | /* If this call fails, the stream is being used hence data pending. */ |
3786 | ret = stream_try_lock(stream); | |
3787 | if (!ret) { | |
f7079f67 | 3788 | goto data_pending; |
ca22feea | 3789 | } |
ca22feea | 3790 | |
4e9a4686 DG |
3791 | /* |
3792 | * A removed node from the hash table indicates that the stream has | |
3793 | * been deleted thus having a guarantee that the buffers are closed | |
3794 | * on the consumer side. However, data can still be transmitted | |
3795 | * over the network so don't skip the relayd check. | |
3796 | */ | |
3797 | ret = cds_lfht_is_node_deleted(&stream->node.node); | |
3798 | if (!ret) { | |
3799 | /* Check the stream if there is data in the buffers. */ | |
6d805429 DG |
3800 | ret = data_pending(stream); |
3801 | if (ret == 1) { | |
4e9a4686 | 3802 | pthread_mutex_unlock(&stream->lock); |
f7079f67 | 3803 | goto data_pending; |
4e9a4686 DG |
3804 | } |
3805 | } | |
3806 | ||
3807 | /* Relayd check */ | |
f7079f67 | 3808 | if (relayd) { |
c8f59ee5 DG |
3809 | pthread_mutex_lock(&relayd->ctrl_sock_mutex); |
3810 | if (stream->metadata_flag) { | |
ad7051c0 DG |
3811 | ret = relayd_quiescent_control(&relayd->control_sock, |
3812 | stream->relayd_stream_id); | |
c8f59ee5 | 3813 | } else { |
6d805429 | 3814 | ret = relayd_data_pending(&relayd->control_sock, |
39df6d9f DG |
3815 | stream->relayd_stream_id, |
3816 | stream->next_net_seq_num - 1); | |
c8f59ee5 DG |
3817 | } |
3818 | pthread_mutex_unlock(&relayd->ctrl_sock_mutex); | |
6d805429 | 3819 | if (ret == 1) { |
4e9a4686 | 3820 | pthread_mutex_unlock(&stream->lock); |
f7079f67 | 3821 | goto data_pending; |
c8f59ee5 DG |
3822 | } |
3823 | } | |
4e9a4686 | 3824 | pthread_mutex_unlock(&stream->lock); |
c8f59ee5 | 3825 | } |
ca22feea | 3826 | |
f7079f67 DG |
3827 | if (relayd) { |
3828 | unsigned int is_data_inflight = 0; | |
3829 | ||
3830 | /* Send init command for data pending. */ | |
3831 | pthread_mutex_lock(&relayd->ctrl_sock_mutex); | |
3832 | ret = relayd_end_data_pending(&relayd->control_sock, | |
3833 | relayd->relayd_session_id, &is_data_inflight); | |
3834 | pthread_mutex_unlock(&relayd->ctrl_sock_mutex); | |
bdd88757 | 3835 | if (ret < 0) { |
f7079f67 DG |
3836 | goto data_not_pending; |
3837 | } | |
bdd88757 DG |
3838 | if (is_data_inflight) { |
3839 | goto data_pending; | |
3840 | } | |
f7079f67 DG |
3841 | } |
3842 | ||
ca22feea | 3843 | /* |
f7079f67 DG |
3844 | * Finding _no_ node in the hash table and no inflight data means that the |
3845 | * stream(s) have been removed thus data is guaranteed to be available for | |
3846 | * analysis from the trace files. | |
ca22feea DG |
3847 | */ |
3848 | ||
f7079f67 | 3849 | data_not_pending: |
ca22feea DG |
3850 | /* Data is available to be read by a viewer. */ |
3851 | pthread_mutex_unlock(&consumer_data.lock); | |
c8f59ee5 | 3852 | rcu_read_unlock(); |
6d805429 | 3853 | return 0; |
ca22feea | 3854 | |
f7079f67 | 3855 | data_pending: |
ca22feea DG |
3856 | /* Data is still being extracted from buffers. */ |
3857 | pthread_mutex_unlock(&consumer_data.lock); | |
c8f59ee5 | 3858 | rcu_read_unlock(); |
6d805429 | 3859 | return 1; |
ca22feea | 3860 | } |
f50f23d9 DG |
3861 | |
3862 | /* | |
3863 | * Send a ret code status message to the sessiond daemon. | |
3864 | * | |
3865 | * Return the sendmsg() return value. | |
3866 | */ | |
3867 | int consumer_send_status_msg(int sock, int ret_code) | |
3868 | { | |
3869 | struct lttcomm_consumer_status_msg msg; | |
3870 | ||
53efb85a | 3871 | memset(&msg, 0, sizeof(msg)); |
f50f23d9 DG |
3872 | msg.ret_code = ret_code; |
3873 | ||
3874 | return lttcomm_send_unix_sock(sock, &msg, sizeof(msg)); | |
3875 | } | |
ffe60014 DG |
3876 | |
3877 | /* | |
3878 | * Send a channel status message to the sessiond daemon. | |
3879 | * | |
3880 | * Return the sendmsg() return value. | |
3881 | */ | |
3882 | int consumer_send_status_channel(int sock, | |
3883 | struct lttng_consumer_channel *channel) | |
3884 | { | |
3885 | struct lttcomm_consumer_status_channel msg; | |
3886 | ||
3887 | assert(sock >= 0); | |
3888 | ||
53efb85a | 3889 | memset(&msg, 0, sizeof(msg)); |
ffe60014 | 3890 | if (!channel) { |
0c759fc9 | 3891 | msg.ret_code = LTTCOMM_CONSUMERD_CHANNEL_FAIL; |
ffe60014 | 3892 | } else { |
0c759fc9 | 3893 | msg.ret_code = LTTCOMM_CONSUMERD_SUCCESS; |
ffe60014 DG |
3894 | msg.key = channel->key; |
3895 | msg.stream_count = channel->streams.count; | |
3896 | } | |
3897 | ||
3898 | return lttcomm_send_unix_sock(sock, &msg, sizeof(msg)); | |
3899 | } | |
5c786ded | 3900 | |
d07ceecd MD |
3901 | unsigned long consumer_get_consume_start_pos(unsigned long consumed_pos, |
3902 | unsigned long produced_pos, uint64_t nb_packets_per_stream, | |
3903 | uint64_t max_sb_size) | |
5c786ded | 3904 | { |
d07ceecd | 3905 | unsigned long start_pos; |
5c786ded | 3906 | |
d07ceecd MD |
3907 | if (!nb_packets_per_stream) { |
3908 | return consumed_pos; /* Grab everything */ | |
3909 | } | |
3910 | start_pos = produced_pos - offset_align_floor(produced_pos, max_sb_size); | |
3911 | start_pos -= max_sb_size * nb_packets_per_stream; | |
3912 | if ((long) (start_pos - consumed_pos) < 0) { | |
3913 | return consumed_pos; /* Grab everything */ | |
3914 | } | |
3915 | return start_pos; | |
5c786ded | 3916 | } |
a1ae2ea5 | 3917 | |
b99a8d42 JD |
3918 | static |
3919 | int consumer_flush_buffer(struct lttng_consumer_stream *stream, int producer_active) | |
3920 | { | |
3921 | int ret = 0; | |
3922 | ||
3923 | switch (consumer_data.type) { | |
3924 | case LTTNG_CONSUMER_KERNEL: | |
3925 | ret = kernctl_buffer_flush(stream->wait_fd); | |
3926 | if (ret < 0) { | |
3927 | ERR("Failed to flush kernel stream"); | |
3928 | goto end; | |
3929 | } | |
3930 | break; | |
3931 | case LTTNG_CONSUMER32_UST: | |
3932 | case LTTNG_CONSUMER64_UST: | |
3933 | lttng_ustctl_flush_buffer(stream, producer_active); | |
3934 | break; | |
3935 | default: | |
3936 | ERR("Unknown consumer_data type"); | |
3937 | abort(); | |
3938 | } | |
3939 | ||
3940 | end: | |
3941 | return ret; | |
3942 | } | |
3943 | ||
3944 | /* | |
3945 | * Sample the rotate position for all the streams of a channel. If a stream | |
3946 | * is already at the rotate position (produced == consumed), we flag it as | |
3947 | * ready for rotation. The rotation of ready streams occurs after we have | |
3948 | * replied to the session daemon that we have finished sampling the positions. | |
3949 | * | |
3950 | * Returns 0 on success, < 0 on error | |
3951 | */ | |
3952 | int lttng_consumer_rotate_channel(uint64_t key, const char *path, | |
3953 | uint64_t relayd_id, uint32_t metadata, uint64_t new_chunk_id, | |
3954 | struct lttng_consumer_local_data *ctx) | |
3955 | { | |
3956 | int ret; | |
3957 | struct lttng_consumer_channel *channel; | |
3958 | struct lttng_consumer_stream *stream; | |
3959 | struct lttng_ht_iter iter; | |
3960 | struct lttng_ht *ht = consumer_data.stream_per_chan_id_ht; | |
3961 | ||
3962 | DBG("Consumer sample rotate position for channel %" PRIu64, key); | |
3963 | ||
3964 | rcu_read_lock(); | |
3965 | ||
3966 | channel = consumer_find_channel(key); | |
3967 | if (!channel) { | |
3968 | ERR("No channel found for key %" PRIu64, key); | |
3969 | ret = -1; | |
3970 | goto end; | |
3971 | } | |
3972 | ||
3973 | pthread_mutex_lock(&channel->lock); | |
3974 | channel->current_chunk_id = new_chunk_id; | |
3975 | ||
3976 | ret = lttng_strncpy(channel->pathname, path, sizeof(channel->pathname)); | |
3977 | if (ret) { | |
3978 | ERR("Failed to copy new path to channel during channel rotation"); | |
3979 | ret = -1; | |
3980 | goto end_unlock_channel; | |
3981 | } | |
3982 | ||
3983 | if (relayd_id == -1ULL) { | |
3984 | /* | |
3985 | * The domain path (/ust or /kernel) has been created before, we | |
3986 | * now need to create the last part of the path: the application/user | |
3987 | * specific section (uid/1000/64-bit). | |
3988 | */ | |
3989 | ret = utils_mkdir_recursive(channel->pathname, S_IRWXU | S_IRWXG, | |
3990 | channel->uid, channel->gid); | |
3991 | if (ret < 0) { | |
3992 | ERR("Failed to create trace directory at %s during rotation", | |
3993 | channel->pathname); | |
3994 | ret = -1; | |
3995 | goto end_unlock_channel; | |
3996 | } | |
3997 | } | |
3998 | ||
3999 | cds_lfht_for_each_entry_duplicate(ht->ht, | |
4000 | ht->hash_fct(&channel->key, lttng_ht_seed), | |
4001 | ht->match_fct, &channel->key, &iter.iter, | |
4002 | stream, node_channel_id.node) { | |
4003 | unsigned long consumed_pos; | |
4004 | ||
4005 | health_code_update(); | |
4006 | ||
4007 | /* | |
4008 | * Lock stream because we are about to change its state. | |
4009 | */ | |
4010 | pthread_mutex_lock(&stream->lock); | |
4011 | ||
4012 | ret = lttng_strncpy(stream->channel_read_only_attributes.path, | |
4013 | channel->pathname, | |
4014 | sizeof(stream->channel_read_only_attributes.path)); | |
4015 | if (ret) { | |
4016 | ERR("Failed to sample channel path name during channel rotation"); | |
4017 | goto end_unlock_stream; | |
4018 | } | |
4019 | ret = lttng_consumer_sample_snapshot_positions(stream); | |
4020 | if (ret < 0) { | |
4021 | ERR("Failed to sample snapshot position during channel rotation"); | |
4022 | goto end_unlock_stream; | |
4023 | } | |
4024 | ||
4025 | ret = lttng_consumer_get_produced_snapshot(stream, | |
4026 | &stream->rotate_position); | |
4027 | if (ret < 0) { | |
4028 | ERR("Failed to sample produced position during channel rotation"); | |
4029 | goto end_unlock_stream; | |
4030 | } | |
4031 | ||
4032 | lttng_consumer_get_consumed_snapshot(stream, | |
4033 | &consumed_pos); | |
4034 | if (consumed_pos == stream->rotate_position) { | |
4035 | stream->rotate_ready = true; | |
4036 | } | |
4037 | channel->nr_stream_rotate_pending++; | |
4038 | ||
4039 | ret = consumer_flush_buffer(stream, 1); | |
4040 | if (ret < 0) { | |
4041 | ERR("Failed to flush stream %" PRIu64 " during channel rotation", | |
4042 | stream->key); | |
4043 | goto end_unlock_stream; | |
4044 | } | |
4045 | ||
4046 | pthread_mutex_unlock(&stream->lock); | |
4047 | } | |
4048 | pthread_mutex_unlock(&channel->lock); | |
4049 | ||
4050 | ret = 0; | |
4051 | goto end; | |
4052 | ||
4053 | end_unlock_stream: | |
4054 | pthread_mutex_unlock(&stream->lock); | |
4055 | end_unlock_channel: | |
4056 | pthread_mutex_unlock(&channel->lock); | |
4057 | end: | |
4058 | rcu_read_unlock(); | |
4059 | return ret; | |
4060 | } | |
4061 | ||
02d02e31 JD |
4062 | /* |
4063 | * Check if a stream is ready to be rotated after extracting it. | |
4064 | * | |
4065 | * Return 1 if it is ready for rotation, 0 if it is not, a negative value on | |
4066 | * error. Stream lock must be held. | |
4067 | */ | |
4068 | int lttng_consumer_stream_is_rotate_ready(struct lttng_consumer_stream *stream) | |
4069 | { | |
4070 | int ret; | |
4071 | unsigned long consumed_pos; | |
4072 | ||
4073 | if (!stream->rotate_position && !stream->rotate_ready) { | |
4074 | ret = 0; | |
4075 | goto end; | |
4076 | } | |
4077 | ||
4078 | if (stream->rotate_ready) { | |
4079 | ret = 1; | |
4080 | goto end; | |
4081 | } | |
4082 | ||
4083 | /* | |
4084 | * If we don't have the rotate_ready flag, check the consumed position | |
4085 | * to determine if we need to rotate. | |
4086 | */ | |
4087 | ret = lttng_consumer_sample_snapshot_positions(stream); | |
4088 | if (ret < 0) { | |
4089 | ERR("Taking snapshot positions"); | |
4090 | goto end; | |
4091 | } | |
4092 | ||
4093 | ret = lttng_consumer_get_consumed_snapshot(stream, &consumed_pos); | |
4094 | if (ret < 0) { | |
4095 | ERR("Consumed snapshot position"); | |
4096 | goto end; | |
4097 | } | |
4098 | ||
4099 | /* Rotate position not reached yet (with check for overflow). */ | |
4100 | if ((long) (consumed_pos - stream->rotate_position) < 0) { | |
4101 | ret = 0; | |
4102 | goto end; | |
4103 | } | |
4104 | ret = 1; | |
4105 | ||
4106 | end: | |
4107 | return ret; | |
4108 | } | |
4109 | ||
d73bf3d7 JD |
4110 | /* |
4111 | * Reset the state for a stream after a rotation occurred. | |
4112 | */ | |
4113 | void lttng_consumer_reset_stream_rotate_state(struct lttng_consumer_stream *stream) | |
4114 | { | |
4115 | stream->rotate_position = 0; | |
4116 | stream->rotate_ready = false; | |
4117 | } | |
4118 | ||
4119 | /* | |
4120 | * Perform the rotation a local stream file. | |
4121 | */ | |
4122 | int rotate_local_stream(struct lttng_consumer_local_data *ctx, | |
4123 | struct lttng_consumer_stream *stream) | |
4124 | { | |
4125 | int ret; | |
4126 | ||
4127 | DBG("Rotate local stream: stream key %" PRIu64 ", channel key %" PRIu64 " at path %s", | |
4128 | stream->key, | |
4129 | stream->chan->key, | |
4130 | stream->channel_read_only_attributes.path); | |
4131 | ||
4132 | ret = close(stream->out_fd); | |
4133 | if (ret < 0) { | |
4134 | PERROR("Closing trace file (fd %d), stream %" PRIu64, | |
4135 | stream->out_fd, stream->key); | |
4136 | assert(0); | |
4137 | goto error; | |
4138 | } | |
4139 | ||
4140 | ret = utils_create_stream_file( | |
4141 | stream->channel_read_only_attributes.path, | |
4142 | stream->name, | |
4143 | stream->channel_read_only_attributes.tracefile_size, | |
4144 | stream->tracefile_count_current, | |
4145 | stream->uid, stream->gid, NULL); | |
4146 | if (ret < 0) { | |
4147 | ERR("Rotate create stream file"); | |
4148 | goto error; | |
4149 | } | |
4150 | stream->out_fd = ret; | |
4151 | stream->tracefile_size_current = 0; | |
4152 | ||
4153 | if (!stream->metadata_flag) { | |
4154 | struct lttng_index_file *index_file; | |
4155 | ||
4156 | lttng_index_file_put(stream->index_file); | |
4157 | ||
4158 | index_file = lttng_index_file_create( | |
4159 | stream->channel_read_only_attributes.path, | |
4160 | stream->name, stream->uid, stream->gid, | |
4161 | stream->channel_read_only_attributes.tracefile_size, | |
4162 | stream->tracefile_count_current, | |
4163 | CTF_INDEX_MAJOR, CTF_INDEX_MINOR); | |
4164 | if (!index_file) { | |
4165 | ERR("Create index file during rotation"); | |
4166 | goto error; | |
4167 | } | |
4168 | stream->index_file = index_file; | |
4169 | stream->out_fd_offset = 0; | |
4170 | } | |
4171 | ||
4172 | ret = 0; | |
4173 | goto end; | |
4174 | ||
4175 | error: | |
4176 | ret = -1; | |
4177 | end: | |
4178 | return ret; | |
4179 | ||
4180 | } | |
4181 | ||
4182 | /* | |
4183 | * Perform the rotation a stream file on the relay. | |
4184 | */ | |
4185 | int rotate_relay_stream(struct lttng_consumer_local_data *ctx, | |
4186 | struct lttng_consumer_stream *stream) | |
4187 | { | |
4188 | int ret; | |
4189 | struct consumer_relayd_sock_pair *relayd; | |
4190 | ||
4191 | DBG("Rotate relay stream"); | |
4192 | relayd = consumer_find_relayd(stream->net_seq_idx); | |
4193 | if (!relayd) { | |
4194 | ERR("Failed to find relayd"); | |
4195 | ret = -1; | |
4196 | goto end; | |
4197 | } | |
4198 | ||
4199 | pthread_mutex_lock(&relayd->ctrl_sock_mutex); | |
4200 | ret = relayd_rotate_stream(&relayd->control_sock, | |
4201 | stream->relayd_stream_id, | |
4202 | stream->channel_read_only_attributes.path, | |
4203 | stream->chan->current_chunk_id, | |
4204 | stream->last_sequence_number); | |
4205 | pthread_mutex_unlock(&relayd->ctrl_sock_mutex); | |
4206 | if (ret) { | |
4207 | ERR("Rotate relay stream"); | |
4208 | } | |
4209 | ||
4210 | end: | |
4211 | return ret; | |
4212 | } | |
4213 | ||
4214 | /* | |
4215 | * Performs the stream rotation for the rotate session feature if needed. | |
4216 | * It must be called with the stream lock held. | |
4217 | * | |
4218 | * Return 0 on success, a negative number of error. | |
4219 | */ | |
4220 | int lttng_consumer_rotate_stream(struct lttng_consumer_local_data *ctx, | |
02d02e31 | 4221 | struct lttng_consumer_stream *stream, bool *rotated) |
d73bf3d7 JD |
4222 | { |
4223 | int ret; | |
4224 | ||
4225 | DBG("Consumer rotate stream %" PRIu64, stream->key); | |
4226 | ||
4227 | if (stream->net_seq_idx != (uint64_t) -1ULL) { | |
4228 | ret = rotate_relay_stream(ctx, stream); | |
4229 | } else { | |
4230 | ret = rotate_local_stream(ctx, stream); | |
4231 | } | |
4232 | if (ret < 0) { | |
4233 | ERR("Rotate stream"); | |
4234 | goto error; | |
4235 | } | |
4236 | ||
4237 | if (stream->metadata_flag) { | |
4238 | switch (consumer_data.type) { | |
4239 | case LTTNG_CONSUMER_KERNEL: | |
4240 | /* | |
4241 | * Reset the position of what has been read from the metadata | |
4242 | * cache to 0 so we can dump it again. | |
4243 | */ | |
4244 | ret = kernctl_metadata_cache_dump(stream->wait_fd); | |
4245 | if (ret < 0) { | |
4246 | ERR("Failed to dump the kernel metadata cache after rotation"); | |
4247 | goto error; | |
4248 | } | |
4249 | break; | |
4250 | case LTTNG_CONSUMER32_UST: | |
4251 | case LTTNG_CONSUMER64_UST: | |
4252 | /* | |
4253 | * Reset the position pushed from the metadata cache so it | |
4254 | * will write from the beginning on the next push. | |
4255 | */ | |
4256 | stream->ust_metadata_pushed = 0; | |
4257 | break; | |
4258 | default: | |
4259 | ERR("Unknown consumer_data type"); | |
4260 | abort(); | |
4261 | } | |
4262 | } | |
4263 | lttng_consumer_reset_stream_rotate_state(stream); | |
4264 | ||
02d02e31 JD |
4265 | if (rotated) { |
4266 | *rotated = true; | |
4267 | } | |
4268 | ||
d73bf3d7 JD |
4269 | ret = 0; |
4270 | ||
4271 | error: | |
4272 | return ret; | |
4273 | } | |
4274 | ||
b99a8d42 JD |
4275 | /* |
4276 | * Rotate all the ready streams now. | |
4277 | * | |
4278 | * This is especially important for low throughput streams that have already | |
4279 | * been consumed, we cannot wait for their next packet to perform the | |
4280 | * rotation. | |
4281 | * | |
4282 | * Returns 0 on success, < 0 on error | |
4283 | */ | |
4284 | int lttng_consumer_rotate_ready_streams(uint64_t key, | |
4285 | struct lttng_consumer_local_data *ctx) | |
4286 | { | |
4287 | int ret; | |
4288 | struct lttng_consumer_channel *channel; | |
4289 | struct lttng_consumer_stream *stream; | |
4290 | struct lttng_ht_iter iter; | |
4291 | struct lttng_ht *ht = consumer_data.stream_per_chan_id_ht; | |
4292 | ||
4293 | rcu_read_lock(); | |
4294 | ||
4295 | DBG("Consumer rotate ready streams in channel %" PRIu64, key); | |
4296 | ||
4297 | channel = consumer_find_channel(key); | |
4298 | if (!channel) { | |
4299 | ERR("No channel found for key %" PRIu64, key); | |
4300 | ret = -1; | |
4301 | goto end; | |
4302 | } | |
4303 | ||
4304 | cds_lfht_for_each_entry_duplicate(ht->ht, | |
4305 | ht->hash_fct(&channel->key, lttng_ht_seed), | |
4306 | ht->match_fct, &channel->key, &iter.iter, | |
4307 | stream, node_channel_id.node) { | |
4308 | health_code_update(); | |
4309 | ||
4310 | pthread_mutex_lock(&stream->lock); | |
4311 | ||
4312 | if (!stream->rotate_ready) { | |
4313 | pthread_mutex_unlock(&stream->lock); | |
4314 | continue; | |
4315 | } | |
4316 | DBG("Consumer rotate ready stream %" PRIu64, stream->key); | |
4317 | ||
4318 | ret = lttng_consumer_rotate_stream(ctx, stream, NULL); | |
4319 | pthread_mutex_unlock(&stream->lock); | |
4320 | if (ret) { | |
4321 | goto end; | |
4322 | } | |
4323 | ||
4324 | ret = consumer_post_rotation(stream, ctx); | |
4325 | if (ret) { | |
4326 | goto end; | |
4327 | } | |
4328 | } | |
4329 | ||
4330 | ret = 0; | |
4331 | ||
4332 | end: | |
4333 | rcu_read_unlock(); | |
4334 | return ret; | |
4335 | } | |
4336 | ||
00fb02ac JD |
4337 | static |
4338 | int rotate_rename_local(const char *old_path, const char *new_path, | |
4339 | uid_t uid, gid_t gid) | |
4340 | { | |
4341 | int ret; | |
4342 | ||
4343 | assert(old_path); | |
4344 | assert(new_path); | |
4345 | ||
4346 | ret = utils_mkdir_recursive(new_path, S_IRWXU | S_IRWXG, uid, gid); | |
4347 | if (ret < 0) { | |
4348 | ERR("Create directory on rotate"); | |
4349 | goto end; | |
4350 | } | |
4351 | ||
4352 | ret = rename(old_path, new_path); | |
4353 | if (ret < 0 && errno != ENOENT) { | |
4354 | PERROR("Rename completed rotation chunk"); | |
4355 | goto end; | |
4356 | } | |
4357 | ||
4358 | ret = 0; | |
4359 | end: | |
4360 | return ret; | |
4361 | } | |
4362 | ||
4363 | static | |
4364 | int rotate_rename_relay(const char *old_path, const char *new_path, | |
4365 | uint64_t relayd_id) | |
4366 | { | |
4367 | int ret; | |
4368 | struct consumer_relayd_sock_pair *relayd; | |
4369 | ||
4370 | relayd = consumer_find_relayd(relayd_id); | |
4371 | if (!relayd) { | |
4372 | ERR("Failed to find relayd while running rotate_rename_relay command"); | |
4373 | ret = -1; | |
4374 | goto end; | |
4375 | } | |
4376 | ||
4377 | pthread_mutex_lock(&relayd->ctrl_sock_mutex); | |
4378 | ret = relayd_rotate_rename(&relayd->control_sock, old_path, new_path); | |
4379 | pthread_mutex_unlock(&relayd->ctrl_sock_mutex); | |
4380 | end: | |
4381 | return ret; | |
4382 | } | |
4383 | ||
4384 | int lttng_consumer_rotate_rename(const char *old_path, const char *new_path, | |
4385 | uid_t uid, gid_t gid, uint64_t relayd_id) | |
4386 | { | |
4387 | if (relayd_id != -1ULL) { | |
4388 | return rotate_rename_relay(old_path, new_path, relayd_id); | |
4389 | } else { | |
4390 | return rotate_rename_local(old_path, new_path, uid, gid); | |
4391 | } | |
4392 | } | |
4393 | ||
d88744a4 JD |
4394 | int lttng_consumer_rotate_pending_relay(uint64_t session_id, |
4395 | uint64_t relayd_id, uint64_t chunk_id) | |
4396 | { | |
4397 | int ret; | |
4398 | struct consumer_relayd_sock_pair *relayd; | |
4399 | ||
4400 | relayd = consumer_find_relayd(relayd_id); | |
4401 | if (!relayd) { | |
4402 | ERR("Failed to find relayd"); | |
4403 | ret = -1; | |
4404 | goto end; | |
4405 | } | |
4406 | ||
4407 | pthread_mutex_lock(&relayd->ctrl_sock_mutex); | |
4408 | ret = relayd_rotate_pending(&relayd->control_sock, chunk_id); | |
4409 | pthread_mutex_unlock(&relayd->ctrl_sock_mutex); | |
4410 | ||
4411 | end: | |
4412 | return ret; | |
4413 | } | |
4414 | ||
a1ae2ea5 JD |
4415 | static |
4416 | int mkdir_local(const char *path, uid_t uid, gid_t gid) | |
4417 | { | |
4418 | int ret; | |
4419 | ||
4420 | ret = utils_mkdir_recursive(path, S_IRWXU | S_IRWXG, uid, gid); | |
4421 | if (ret < 0) { | |
4422 | /* utils_mkdir_recursive logs an error. */ | |
4423 | goto end; | |
4424 | } | |
4425 | ||
4426 | ret = 0; | |
4427 | end: | |
4428 | return ret; | |
4429 | } | |
4430 | ||
4431 | static | |
4432 | int mkdir_relay(const char *path, uint64_t relayd_id) | |
4433 | { | |
4434 | int ret; | |
4435 | struct consumer_relayd_sock_pair *relayd; | |
4436 | ||
4437 | relayd = consumer_find_relayd(relayd_id); | |
4438 | if (!relayd) { | |
4439 | ERR("Failed to find relayd"); | |
4440 | ret = -1; | |
4441 | goto end; | |
4442 | } | |
4443 | ||
4444 | pthread_mutex_lock(&relayd->ctrl_sock_mutex); | |
4445 | ret = relayd_mkdir(&relayd->control_sock, path); | |
4446 | pthread_mutex_unlock(&relayd->ctrl_sock_mutex); | |
4447 | ||
4448 | end: | |
4449 | return ret; | |
4450 | ||
4451 | } | |
4452 | ||
4453 | int lttng_consumer_mkdir(const char *path, uid_t uid, gid_t gid, | |
4454 | uint64_t relayd_id) | |
4455 | { | |
4456 | if (relayd_id != -1ULL) { | |
4457 | return mkdir_relay(path, relayd_id); | |
4458 | } else { | |
4459 | return mkdir_local(path, uid, gid); | |
4460 | } | |
4461 | } |