Reference count ltt_session objects
[lttng-tools.git] / src / bin / lttng-sessiond / rotation-thread.c
CommitLineData
db66e574
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1/*
2 * Copyright (C) 2017 - Julien Desfossez <jdesfossez@efficios.com>
92816cc3 3 * Copyright (C) 2018 - Jérémie Galarneau <jeremie.galarneau@efficios.com>
db66e574
JD
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License, version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
12 * more details.
13 *
14 * You should have received a copy of the GNU General Public License along with
15 * this program; if not, write to the Free Software Foundation, Inc., 51
16 * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
17 */
18
19#define _LGPL_SOURCE
20#include <lttng/trigger/trigger.h>
21#include <common/error.h>
22#include <common/config/session-config.h>
23#include <common/defaults.h>
24#include <common/utils.h>
25#include <common/futex.h>
26#include <common/align.h>
27#include <common/time.h>
28#include <common/hashtable/utils.h>
29#include <sys/eventfd.h>
30#include <sys/stat.h>
31#include <time.h>
32#include <signal.h>
33#include <inttypes.h>
34
35#include <common/kernel-ctl/kernel-ctl.h>
36#include <lttng/notification/channel-internal.h>
5c408ad8 37#include <lttng/rotate-internal.h>
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38
39#include "rotation-thread.h"
40#include "lttng-sessiond.h"
41#include "health-sessiond.h"
42#include "rotate.h"
43#include "cmd.h"
44#include "session.h"
8e319828 45#include "timer.h"
17dd1232 46#include "notification-thread-commands.h"
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47
48#include <urcu.h>
49#include <urcu/list.h>
db66e574 50
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51struct lttng_notification_channel *rotate_notification_channel = NULL;
52
92816cc3 53struct rotation_thread {
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54 struct lttng_poll_event events;
55};
56
92816cc3
JG
57struct rotation_thread_job {
58 enum rotation_thread_job_type type;
59 uint64_t session_id;
60 /* List member in struct rotation_thread_timer_queue. */
61 struct cds_list_head head;
62};
63
64/*
65 * The timer thread enqueues jobs and wakes up the rotation thread.
66 * When the rotation thread wakes up, it empties the queue.
67 */
68struct rotation_thread_timer_queue {
69 struct lttng_pipe *event_pipe;
70 struct cds_list_head list;
71 pthread_mutex_t lock;
72};
73
74struct rotation_thread_handle {
92816cc3
JG
75 struct rotation_thread_timer_queue *rotation_timer_queue;
76 /* Access to the notification thread cmd_queue */
77 struct notification_thread_handle *notification_thread_handle;
78 sem_t *notification_thread_ready;
79};
80
db66e574 81static
92816cc3 82const char *get_job_type_str(enum rotation_thread_job_type job_type)
db66e574 83{
92816cc3
JG
84 switch (job_type) {
85 case ROTATION_THREAD_JOB_TYPE_CHECK_PENDING_ROTATION:
86 return "CHECK_PENDING_ROTATION";
87 case ROTATION_THREAD_JOB_TYPE_SCHEDULED_ROTATION:
88 return "SCHEDULED_ROTATION";
89 default:
90 abort();
91 }
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92}
93
92816cc3 94struct rotation_thread_timer_queue *rotation_thread_timer_queue_create(void)
db66e574 95{
92816cc3 96 struct rotation_thread_timer_queue *queue = NULL;
db66e574 97
92816cc3
JG
98 queue = zmalloc(sizeof(*queue));
99 if (!queue) {
100 PERROR("Failed to allocate timer rotate queue");
101 goto end;
102 }
db66e574 103
92816cc3
JG
104 queue->event_pipe = lttng_pipe_open(FD_CLOEXEC | O_NONBLOCK);
105 CDS_INIT_LIST_HEAD(&queue->list);
106 pthread_mutex_init(&queue->lock, NULL);
107end:
108 return queue;
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109}
110
92816cc3 111void log_job_destruction(const struct rotation_thread_job *job)
db66e574 112{
92816cc3
JG
113 enum lttng_error_level log_level;
114 const char *job_type_str = get_job_type_str(job->type);
115
116 switch (job->type) {
117 case ROTATION_THREAD_JOB_TYPE_SCHEDULED_ROTATION:
118 /*
119 * Not a problem, the scheduled rotation is racing with the teardown
120 * of the daemon. In this case, the rotation will not happen, which
121 * is not a problem (or at least, not important enough to delay
122 * the shutdown of the session daemon).
123 */
124 log_level = PRINT_DBG;
125 break;
126 case ROTATION_THREAD_JOB_TYPE_CHECK_PENDING_ROTATION:
127 /* This is not expected to happen; warn the user. */
128 log_level = PRINT_WARN;
129 break;
130 default:
131 abort();
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132 }
133
92816cc3
JG
134 LOG(log_level, "Rotation thread timer queue still contains job of type %s targeting session %" PRIu64 " on destruction",
135 job_type_str, job->session_id);
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136}
137
92816cc3
JG
138void rotation_thread_timer_queue_destroy(
139 struct rotation_thread_timer_queue *queue)
db66e574 140{
92816cc3 141 struct rotation_thread_job *job, *tmp_job;
db66e574 142
92816cc3
JG
143 if (!queue) {
144 return;
db66e574
JD
145 }
146
92816cc3
JG
147 lttng_pipe_destroy(queue->event_pipe);
148
149 pthread_mutex_lock(&queue->lock);
150 /* Empty wait queue. */
151 cds_list_for_each_entry_safe(job, tmp_job, &queue->list, head) {
152 log_job_destruction(job);
153 cds_list_del(&job->head);
154 free(job);
db66e574 155 }
92816cc3
JG
156 pthread_mutex_unlock(&queue->lock);
157 pthread_mutex_destroy(&queue->lock);
158 free(queue);
159}
db66e574 160
92816cc3
JG
161/*
162 * Destroy the thread data previously created by the init function.
163 */
164void rotation_thread_handle_destroy(
165 struct rotation_thread_handle *handle)
166{
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167 free(handle);
168}
169
170struct rotation_thread_handle *rotation_thread_handle_create(
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171 struct rotation_thread_timer_queue *rotation_timer_queue,
172 struct notification_thread_handle *notification_thread_handle,
173 sem_t *notification_thread_ready)
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174{
175 struct rotation_thread_handle *handle;
176
177 handle = zmalloc(sizeof(*handle));
178 if (!handle) {
179 goto end;
180 }
181
92816cc3
JG
182 handle->rotation_timer_queue = rotation_timer_queue;
183 handle->notification_thread_handle = notification_thread_handle;
184 handle->notification_thread_ready = notification_thread_ready;
185
186end:
187 return handle;
188}
189
190/*
191 * Called with the rotation_thread_timer_queue lock held.
192 * Return true if the same timer job already exists in the queue, false if not.
193 */
194static
195bool timer_job_exists(const struct rotation_thread_timer_queue *queue,
196 enum rotation_thread_job_type job_type, uint64_t session_id)
197{
198 bool exists = false;
199 struct rotation_thread_job *job;
200
201 cds_list_for_each_entry(job, &queue->list, head) {
202 if (job->session_id == session_id && job->type == job_type) {
203 exists = true;
204 goto end;
db66e574 205 }
db66e574 206 }
92816cc3
JG
207end:
208 return exists;
209}
210
211void rotation_thread_enqueue_job(struct rotation_thread_timer_queue *queue,
212 enum rotation_thread_job_type job_type, uint64_t session_id)
213{
214 int ret;
215 const char * const dummy = "!";
216 struct rotation_thread_job *job = NULL;
217 const char *job_type_str = get_job_type_str(job_type);
218
219 pthread_mutex_lock(&queue->lock);
220 if (timer_job_exists(queue, session_id, job_type)) {
221 /*
222 * This timer job is already pending, we don't need to add
223 * it.
224 */
225 goto end;
db66e574 226 }
92816cc3
JG
227
228 job = zmalloc(sizeof(struct rotation_thread_job));
229 if (!job) {
230 PERROR("Failed to allocate rotation thread job of type \"%s\" for session id %" PRIu64,
231 job_type_str, session_id);
232 goto end;
233 }
234 job->type = job_type;
235 job->session_id = session_id;
236 cds_list_add_tail(&job->head, &queue->list);
237
238 ret = lttng_write(lttng_pipe_get_writefd(queue->event_pipe), dummy,
239 1);
240 if (ret < 0) {
241 /*
242 * We do not want to block in the timer handler, the job has
243 * been enqueued in the list, the wakeup pipe is probably full,
244 * the job will be processed when the rotation_thread catches
245 * up.
246 */
247 if (errno == EAGAIN || errno == EWOULDBLOCK) {
248 /*
249 * Not an error, but would be surprising and indicate
250 * that the rotation thread can't keep up with the
251 * current load.
252 */
253 DBG("Wake-up pipe of rotation thread job queue is full");
254 goto end;
db66e574 255 }
92816cc3
JG
256 PERROR("Failed to wake-up the rotation thread after pushing a job of type \"%s\" for session id %" PRIu64,
257 job_type_str, session_id);
258 goto end;
db66e574 259 }
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260
261end:
92816cc3 262 pthread_mutex_unlock(&queue->lock);
db66e574
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263}
264
265static
266int init_poll_set(struct lttng_poll_event *poll_set,
267 struct rotation_thread_handle *handle)
268{
269 int ret;
270
271 /*
92816cc3
JG
272 * Create pollset with size 2:
273 * - quit pipe,
274 * - rotation thread timer queue pipe,
db66e574 275 */
a7333da7
JG
276 ret = sessiond_set_thread_pollset(poll_set, 2);
277 if (ret) {
db66e574
JD
278 goto error;
279 }
d086f507
JD
280 ret = lttng_poll_add(poll_set,
281 lttng_pipe_get_readfd(handle->rotation_timer_queue->event_pipe),
282 LPOLLIN | LPOLLERR);
283 if (ret < 0) {
284 ERR("[rotation-thread] Failed to add rotate_pending fd to pollset");
285 goto error;
286 }
db66e574 287
db66e574
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288 return ret;
289error:
290 lttng_poll_clean(poll_set);
291 return ret;
292}
293
294static
92816cc3 295void fini_thread_state(struct rotation_thread *state)
db66e574
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296{
297 lttng_poll_clean(&state->events);
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298 if (rotate_notification_channel) {
299 lttng_notification_channel_destroy(rotate_notification_channel);
300 }
db66e574
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301}
302
303static
304int init_thread_state(struct rotation_thread_handle *handle,
92816cc3 305 struct rotation_thread *state)
db66e574
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306{
307 int ret;
308
309 memset(state, 0, sizeof(*state));
310 lttng_poll_init(&state->events);
311
312 ret = init_poll_set(&state->events, handle);
313 if (ret) {
314 ERR("[rotation-thread] Failed to initialize rotation thread poll set");
315 goto end;
316 }
317
90936dcf
JD
318 /*
319 * We wait until the notification thread is ready to create the
320 * notification channel and add it to the poll_set.
321 */
322 sem_wait(handle->notification_thread_ready);
323 rotate_notification_channel = lttng_notification_channel_create(
324 lttng_session_daemon_notification_endpoint);
325 if (!rotate_notification_channel) {
326 ERR("[rotation-thread] Could not create notification channel");
327 ret = -1;
328 goto end;
329 }
330 ret = lttng_poll_add(&state->events, rotate_notification_channel->socket,
331 LPOLLIN | LPOLLERR);
332 if (ret < 0) {
333 ERR("[rotation-thread] Failed to add notification fd to pollset");
334 goto end;
335 }
336
db66e574
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337end:
338 return ret;
339}
340
341static
92816cc3
JG
342int check_session_rotation_pending_local_on_consumer(
343 const struct ltt_session *session,
344 struct consumer_socket *socket, bool *rotation_completed)
db66e574 345{
92816cc3
JG
346 int ret;
347
348 pthread_mutex_lock(socket->lock);
349 DBG("[rotation-thread] Checking for locally pending rotation on the %s consumer for session %s",
350 lttng_consumer_type_str(socket->type),
351 session->name);
352 ret = consumer_check_rotation_pending_local(socket,
353 session->id,
354 session->current_archive_id - 1);
355 pthread_mutex_unlock(socket->lock);
356
357 if (ret == 0) {
358 /* Rotation was completed on this consumer. */
359 DBG("[rotation-thread] Local rotation of trace archive %" PRIu64 " of session \"%s\" was completed on the %s consumer",
360 session->current_archive_id - 1,
361 session->name,
362 lttng_consumer_type_str(socket->type));
363 *rotation_completed = true;
364 } else if (ret == 1) {
365 /* Rotation pending on this consumer. */
366 DBG("[rotation-thread] Local rotation of trace archive %" PRIu64 " of session \"%s\" is pending on the %s consumer",
367 session->current_archive_id - 1,
368 session->name,
369 lttng_consumer_type_str(socket->type));
370 *rotation_completed = false;
371 ret = 0;
db66e574 372 } else {
92816cc3
JG
373 /* Not a fatal error. */
374 ERR("[rotation-thread] Encountered an error when checking if local rotation of trace archive %" PRIu64 " of session \"%s\" is pending on the %s consumer",
375 session->current_archive_id - 1,
376 session->name,
377 lttng_consumer_type_str(socket->type));
378 *rotation_completed = false;
db66e574 379 }
92816cc3
JG
380 return ret;
381}
db66e574 382
92816cc3
JG
383static
384int check_session_rotation_pending_local(struct ltt_session *session)
385{
db582e11 386 int ret = 0;
92816cc3
JG
387 struct consumer_socket *socket;
388 struct cds_lfht_iter iter;
389 bool rotation_completed = true;
390
391 /*
392 * Check for a local pending rotation on all consumers (32-bit
393 * user space, 64-bit user space, and kernel).
394 */
395 DBG("[rotation-thread] Checking for pending local rotation on session \"%s\", trace archive %" PRIu64,
396 session->name, session->current_archive_id - 1);
397
398 rcu_read_lock();
399 if (!session->ust_session) {
400 goto skip_ust;
401 }
402 cds_lfht_for_each_entry(session->ust_session->consumer->socks->ht,
403 &iter, socket, node.node) {
404 ret = check_session_rotation_pending_local_on_consumer(session,
405 socket, &rotation_completed);
406 if (ret || !rotation_completed) {
407 goto end;
db66e574 408 }
db66e574
JD
409 }
410
92816cc3
JG
411skip_ust:
412 if (!session->kernel_session) {
413 goto skip_kernel;
db66e574 414 }
92816cc3
JG
415 cds_lfht_for_each_entry(session->kernel_session->consumer->socks->ht,
416 &iter, socket, node.node) {
417 ret = check_session_rotation_pending_local_on_consumer(session,
418 socket, &rotation_completed);
419 if (ret || !rotation_completed) {
420 goto end;
421 }
422 }
423skip_kernel:
424end:
425 rcu_read_unlock();
db66e574 426
92816cc3
JG
427 if (rotation_completed) {
428 DBG("[rotation-thread] Local rotation of trace archive %" PRIu64 " of session \"%s\" is complete on all consumers",
429 session->current_archive_id - 1,
430 session->name);
431 session->rotation_pending_local = false;
db66e574 432 }
92816cc3 433 if (ret) {
2961f09e
JG
434 ret = session_reset_rotation_state(session,
435 LTTNG_ROTATION_STATE_ERROR);
436 if (ret) {
437 ERR("Failed to reset rotation state of session \"%s\"",
438 session->name);
439 }
db66e574 440 }
92816cc3
JG
441 return 0;
442}
db66e574 443
92816cc3
JG
444static
445int check_session_rotation_pending_relay(struct ltt_session *session)
446{
447 int ret;
448 struct consumer_socket *socket;
449 struct cds_lfht_iter iter;
450 bool rotation_completed = true;
451 const struct consumer_output *output;
db66e574 452
92816cc3
JG
453 /*
454 * Check for a pending rotation on any consumer as we only use
455 * it as a "tunnel" to the relayd.
456 */
17dd1232 457
92816cc3
JG
458 rcu_read_lock();
459 if (session->ust_session) {
460 cds_lfht_first(session->ust_session->consumer->socks->ht,
461 &iter);
462 output = session->ust_session->consumer;
463 } else {
464 cds_lfht_first(session->kernel_session->consumer->socks->ht,
465 &iter);
466 output = session->kernel_session->consumer;
db66e574 467 }
92816cc3 468 assert(cds_lfht_iter_get_node(&iter));
db66e574 469
92816cc3
JG
470 socket = caa_container_of(cds_lfht_iter_get_node(&iter),
471 typeof(*socket), node.node);
472
473 pthread_mutex_lock(socket->lock);
474 DBG("[rotation-thread] Checking for pending relay rotation on session \"%s\", trace archive %" PRIu64 " through the %s consumer",
475 session->name, session->current_archive_id - 1,
476 lttng_consumer_type_str(socket->type));
477 ret = consumer_check_rotation_pending_relay(socket,
478 output,
479 session->id,
480 session->current_archive_id - 1);
481 pthread_mutex_unlock(socket->lock);
482
483 if (ret == 0) {
484 /* Rotation was completed on the relay. */
485 DBG("[rotation-thread] Relay rotation of trace archive %" PRIu64 " of session \"%s\" was completed",
486 session->current_archive_id - 1,
487 session->name);
488 } else if (ret == 1) {
489 /* Rotation pending on relay. */
490 DBG("[rotation-thread] Relay rotation of trace archive %" PRIu64 " of session \"%s\" is pending",
491 session->current_archive_id - 1,
492 session->name);
493 rotation_completed = false;
494 } else {
495 /* Not a fatal error. */
496 ERR("[rotation-thread] Encountered an error when checking if rotation of trace archive %" PRIu64 " of session \"%s\" is pending on the relay",
497 session->current_archive_id - 1,
498 session->name);
2961f09e
JG
499 ret = session_reset_rotation_state(session,
500 LTTNG_ROTATION_STATE_ERROR);
501 if (ret) {
502 ERR("Failed to reset rotation state of session \"%s\"",
503 session->name);
504 }
92816cc3
JG
505 rotation_completed = false;
506 }
db66e574 507
db66e574 508 rcu_read_unlock();
92816cc3
JG
509
510 if (rotation_completed) {
cb70f0d5 511 DBG("[rotation-thread] Rotation of trace archive %" PRIu64 " of session \"%s\" is complete on the relay",
92816cc3
JG
512 session->current_archive_id - 1,
513 session->name);
514 session->rotation_pending_relay = false;
515 }
516 return 0;
db66e574
JD
517}
518
d88744a4 519/*
92816cc3 520 * Check if the last rotation was completed, called with session lock held.
d88744a4
JD
521 */
522static
92816cc3
JG
523int check_session_rotation_pending(struct ltt_session *session,
524 struct notification_thread_handle *notification_thread_handle)
d88744a4
JD
525{
526 int ret;
92816cc3
JG
527 struct lttng_trace_archive_location *location;
528 time_t now;
d88744a4 529
92816cc3
JG
530 DBG("[rotation-thread] Checking for pending rotation on session \"%s\", trace archive %" PRIu64,
531 session->name, session->current_archive_id - 1);
532
533 if (session->rotation_pending_local) {
534 /* Updates session->rotation_pending_local as needed. */
535 ret = check_session_rotation_pending_local(session);
536 if (ret) {
537 goto end;
538 }
17dd1232 539
d88744a4 540 /*
92816cc3
JG
541 * No need to check for a pending rotation on the relay
542 * since the rotation is not even completed locally yet.
d88744a4 543 */
92816cc3
JG
544 if (session->rotation_pending_local) {
545 goto end;
17dd1232 546 }
92816cc3
JG
547 }
548
549 if (session->rotation_pending_relay) {
550 /* Updates session->rotation_pending_relay as needed. */
551 ret = check_session_rotation_pending_relay(session);
d88744a4 552 if (ret) {
92816cc3
JG
553 goto end;
554 }
555
556 if (session->rotation_pending_relay) {
d88744a4
JD
557 goto end;
558 }
559 }
560
92816cc3
JG
561 DBG("[rotation-thread] Rotation of trace archive %" PRIu64 " completed for "
562 "session %s", session->current_archive_id - 1,
563 session->name);
d88744a4 564
92816cc3
JG
565 /* Rename the completed trace archive's location. */
566 now = time(NULL);
567 if (now == (time_t) -1) {
2961f09e
JG
568 ret = session_reset_rotation_state(session,
569 LTTNG_ROTATION_STATE_ERROR);
570 if (ret) {
571 ERR("Failed to reset rotation state of session \"%s\"",
572 session->name);
573 }
92816cc3
JG
574 ret = LTTNG_ERR_UNK;
575 goto end;
576 }
577
578 ret = rename_completed_chunk(session, now);
579 if (ret < 0) {
580 ERR("Failed to rename completed rotation chunk");
581 goto end;
582 }
583 session->last_chunk_start_ts = session->current_chunk_start_ts;
584
585 /*
586 * Now we can clear the "ONGOING" state in the session. New
587 * rotations can start now.
588 */
589 session->rotation_state = LTTNG_ROTATION_STATE_COMPLETED;
590
591 /* Ownership of location is transferred. */
592 location = session_get_trace_archive_location(session);
593 ret = notification_thread_command_session_rotation_completed(
594 notification_thread_handle,
595 session->name,
596 session->uid,
597 session->gid,
598 session->current_archive_id,
599 location);
600 if (ret != LTTNG_OK) {
601 ERR("[rotation-thread] Failed to notify notification thread of completed rotation for session %s",
602 session->name);
603 }
604
9402c5b9
JG
605 if (!session->active) {
606 /*
607 * A stop command was issued during the rotation, it is
608 * up to the rotation completion check to perform the
609 * renaming of the last chunk that was produced.
610 */
611 ret = notification_thread_command_session_rotation_ongoing(
612 notification_thread_handle,
613 session->name,
614 session->uid,
615 session->gid,
616 session->current_archive_id);
617 if (ret != LTTNG_OK) {
618 ERR("[rotation-thread] Failed to notify notification thread of completed rotation for session %s",
619 session->name);
620 }
621
622 ret = rename_active_chunk(session);
623 if (ret < 0) {
624 ERR("[rotation-thread] Failed to rename active rotation chunk");
625 goto end;
626 }
627
628 /* Ownership of location is transferred. */
629 location = session_get_trace_archive_location(session);
630 ret = notification_thread_command_session_rotation_completed(
631 notification_thread_handle,
632 session->name,
633 session->uid,
634 session->gid,
635 session->current_archive_id,
636 location);
637 if (ret != LTTNG_OK) {
638 ERR("[rotation-thread] Failed to notify notification thread of completed rotation for session %s",
639 session->name);
640 }
641 }
642
92816cc3 643 ret = 0;
d88744a4 644end:
92816cc3
JG
645 if (session->rotation_state == LTTNG_ROTATION_STATE_ONGOING) {
646 DBG("[rotation-thread] Rotation of trace archive %" PRIu64 " is still pending for session %s",
647 session->current_archive_id - 1, session->name);
648 ret = timer_session_rotation_pending_check_start(session,
649 DEFAULT_ROTATE_PENDING_TIMER);
650 if (ret) {
651 ERR("Re-enabling rotate pending timer");
652 ret = -1;
653 goto end;
654 }
655 }
656
d88744a4
JD
657 return ret;
658}
659
ed1e52a3 660/* Call with the session and session_list locks held. */
259c2674 661static
92816cc3 662int launch_session_rotation(struct ltt_session *session)
259c2674
JD
663{
664 int ret;
92816cc3 665 struct lttng_rotate_session_return rotation_return;
259c2674 666
92816cc3
JG
667 DBG("[rotation-thread] Launching scheduled time-based rotation on session \"%s\"",
668 session->name);
259c2674 669
92816cc3
JG
670 ret = cmd_rotate_session(session, &rotation_return);
671 if (ret == LTTNG_OK) {
672 DBG("[rotation-thread] Scheduled time-based rotation successfully launched on session \"%s\"",
673 session->name);
674 } else {
675 /* Don't consider errors as fatal. */
676 DBG("[rotation-thread] Scheduled time-based rotation aborted for session %s: %s",
677 session->name, lttng_strerror(ret));
259c2674 678 }
92816cc3
JG
679 return 0;
680}
259c2674 681
92816cc3
JG
682static
683int run_job(struct rotation_thread_job *job, struct ltt_session *session,
684 struct notification_thread_handle *notification_thread_handle)
685{
686 int ret;
259c2674 687
92816cc3
JG
688 switch (job->type) {
689 case ROTATION_THREAD_JOB_TYPE_SCHEDULED_ROTATION:
690 ret = launch_session_rotation(session);
691 break;
692 case ROTATION_THREAD_JOB_TYPE_CHECK_PENDING_ROTATION:
693 ret = check_session_rotation_pending(session,
694 notification_thread_handle);
695 break;
696 default:
697 abort();
259c2674 698 }
259c2674
JD
699 return ret;
700}
701
d88744a4 702static
92816cc3
JG
703int handle_job_queue(struct rotation_thread_handle *handle,
704 struct rotation_thread *state,
d88744a4
JD
705 struct rotation_thread_timer_queue *queue)
706{
707 int ret = 0;
708 int fd = lttng_pipe_get_readfd(queue->event_pipe);
92816cc3 709 char buf;
d88744a4 710
92816cc3 711 ret = lttng_read(fd, &buf, 1);
d88744a4
JD
712 if (ret != 1) {
713 ERR("[rotation-thread] Failed to read from wakeup pipe (fd = %i)", fd);
714 ret = -1;
715 goto end;
716 }
717
718 for (;;) {
e32d7f27 719 struct ltt_session *session;
92816cc3 720 struct rotation_thread_job *job;
d88744a4 721
92816cc3 722 /* Take the queue lock only to pop an element from the list. */
d88744a4
JD
723 pthread_mutex_lock(&queue->lock);
724 if (cds_list_empty(&queue->list)) {
725 pthread_mutex_unlock(&queue->lock);
726 break;
727 }
92816cc3
JG
728 job = cds_list_first_entry(&queue->list,
729 typeof(*job), head);
730 cds_list_del(&job->head);
d88744a4
JD
731 pthread_mutex_unlock(&queue->lock);
732
d88744a4 733 session_lock_list();
92816cc3 734 session = session_find_by_id(job->session_id);
d88744a4
JD
735 if (!session) {
736 DBG("[rotation-thread] Session %" PRIu64 " not found",
92816cc3 737 job->session_id);
d88744a4 738 /*
92816cc3
JG
739 * This is a non-fatal error, and we cannot report it to
740 * the user (timer), so just print the error and
741 * continue the processing.
742 *
743 * While the timer thread will purge pending signals for
744 * a session on the session's destruction, it is
745 * possible for a job targeting that session to have
746 * already been queued before it was destroyed.
d88744a4
JD
747 */
748 session_unlock_list();
92816cc3 749 free(job);
e32d7f27 750 session_put(session);
d88744a4
JD
751 continue;
752 }
753
d88744a4 754 session_lock(session);
92816cc3 755 ret = run_job(job, session, handle->notification_thread_handle);
d88744a4 756 session_unlock(session);
e32d7f27 757 session_put(session);
ed1e52a3 758 session_unlock_list();
92816cc3 759 free(job);
d88744a4 760 if (ret) {
d88744a4
JD
761 goto end;
762 }
763 }
764
765 ret = 0;
766
767end:
768 return ret;
769}
770
92816cc3
JG
771static
772int handle_condition(const struct lttng_condition *condition,
90936dcf
JD
773 const struct lttng_evaluation *evaluation,
774 struct notification_thread_handle *notification_thread_handle)
775{
776 int ret = 0;
777 const char *condition_session_name = NULL;
778 enum lttng_condition_type condition_type;
779 enum lttng_condition_status condition_status;
780 enum lttng_evaluation_status evaluation_status;
781 uint64_t consumed;
782 struct ltt_session *session;
783
784 condition_type = lttng_condition_get_type(condition);
785
786 if (condition_type != LTTNG_CONDITION_TYPE_SESSION_CONSUMED_SIZE) {
787 ret = -1;
788 ERR("[rotation-thread] Condition type and session usage type are not the same");
789 goto end;
790 }
791
792 /* Fetch info to test */
793 condition_status = lttng_condition_session_consumed_size_get_session_name(
794 condition, &condition_session_name);
795 if (condition_status != LTTNG_CONDITION_STATUS_OK) {
796 ERR("[rotation-thread] Session name could not be fetched");
797 ret = -1;
798 goto end;
799 }
800 evaluation_status = lttng_evaluation_session_consumed_size_get_consumed_size(evaluation,
801 &consumed);
802 if (evaluation_status != LTTNG_EVALUATION_STATUS_OK) {
803 ERR("[rotation-thread] Failed to get evaluation");
804 ret = -1;
805 goto end;
806 }
807
808 session_lock_list();
809 session = session_find_by_name(condition_session_name);
810 if (!session) {
811 ret = -1;
812 session_unlock_list();
813 ERR("[rotation-thread] Session \"%s\" not found",
814 condition_session_name);
815 goto end;
816 }
817 session_lock(session);
818 session_unlock_list();
819
820 ret = unsubscribe_session_consumed_size_rotation(session,
821 notification_thread_handle);
822 if (ret) {
490b3229 823 goto end_unlock;
90936dcf
JD
824 }
825
826 ret = cmd_rotate_session(session, NULL);
827 if (ret == -LTTNG_ERR_ROTATION_PENDING) {
828 DBG("Rotate already pending, subscribe to the next threshold value");
90936dcf
JD
829 } else if (ret != LTTNG_OK) {
830 ERR("[rotation-thread] Failed to rotate on size notification with error: %s",
831 lttng_strerror(ret));
832 ret = -1;
833 goto end_unlock;
834 }
835 ret = subscribe_session_consumed_size_rotation(session,
836 consumed + session->rotate_size,
837 notification_thread_handle);
838 if (ret) {
839 ERR("[rotation-thread] Failed to subscribe to session consumed size condition");
840 goto end_unlock;
841 }
842 ret = 0;
843
844end_unlock:
845 session_unlock(session);
e32d7f27 846 session_put(session);
90936dcf
JD
847end:
848 return ret;
849}
850
851static
92816cc3 852int handle_notification_channel(int fd,
90936dcf 853 struct rotation_thread_handle *handle,
92816cc3 854 struct rotation_thread *state)
90936dcf
JD
855{
856 int ret;
d73ee93f
JG
857 bool notification_pending;
858 struct lttng_notification *notification = NULL;
90936dcf
JD
859 enum lttng_notification_channel_status status;
860 const struct lttng_evaluation *notification_evaluation;
861 const struct lttng_condition *notification_condition;
862
d73ee93f
JG
863 status = lttng_notification_channel_has_pending_notification(
864 rotate_notification_channel, &notification_pending);
865 if (status != LTTNG_NOTIFICATION_CHANNEL_STATUS_OK) {
a9577b76 866 ERR("[rotation-thread ]Error occurred while checking for pending notification");
d73ee93f
JG
867 ret = -1;
868 goto end;
869 }
870
871 if (!notification_pending) {
872 ret = 0;
873 goto end;
874 }
875
90936dcf
JD
876 /* Receive the next notification. */
877 status = lttng_notification_channel_get_next_notification(
878 rotate_notification_channel,
879 &notification);
880
881 switch (status) {
882 case LTTNG_NOTIFICATION_CHANNEL_STATUS_OK:
883 break;
884 case LTTNG_NOTIFICATION_CHANNEL_STATUS_NOTIFICATIONS_DROPPED:
885 /* Not an error, we will wait for the next one */
886 ret = 0;
887 goto end;;
888 case LTTNG_NOTIFICATION_CHANNEL_STATUS_CLOSED:
889 ERR("Notification channel was closed");
890 ret = -1;
891 goto end;
892 default:
893 /* Unhandled conditions / errors. */
894 ERR("Unknown notification channel status");
895 ret = -1;
896 goto end;
897 }
898
899 notification_condition = lttng_notification_get_condition(notification);
900 notification_evaluation = lttng_notification_get_evaluation(notification);
901
902 ret = handle_condition(notification_condition, notification_evaluation,
903 handle->notification_thread_handle);
904
905end:
906 lttng_notification_destroy(notification);
90936dcf
JD
907 return ret;
908}
909
db66e574
JD
910void *thread_rotation(void *data)
911{
912 int ret;
913 struct rotation_thread_handle *handle = data;
92816cc3 914 struct rotation_thread thread;
db66e574
JD
915
916 DBG("[rotation-thread] Started rotation thread");
917
918 if (!handle) {
919 ERR("[rotation-thread] Invalid thread context provided");
920 goto end;
921 }
922
03732c32
JG
923 rcu_register_thread();
924 rcu_thread_online();
925
db66e574
JD
926 health_register(health_sessiond, HEALTH_SESSIOND_TYPE_ROTATION);
927 health_code_update();
928
92816cc3 929 ret = init_thread_state(handle, &thread);
db66e574 930 if (ret) {
f5f8e5cd 931 goto error;
db66e574
JD
932 }
933
934 /* Ready to handle client connections. */
935 sessiond_notify_ready();
936
937 while (true) {
938 int fd_count, i;
939
940 health_poll_entry();
941 DBG("[rotation-thread] Entering poll wait");
92816cc3 942 ret = lttng_poll_wait(&thread.events, -1);
db66e574
JD
943 DBG("[rotation-thread] Poll wait returned (%i)", ret);
944 health_poll_exit();
945 if (ret < 0) {
946 /*
947 * Restart interrupted system call.
948 */
949 if (errno == EINTR) {
950 continue;
951 }
952 ERR("[rotation-thread] Error encountered during lttng_poll_wait (%i)", ret);
953 goto error;
954 }
955
956 fd_count = ret;
957 for (i = 0; i < fd_count; i++) {
92816cc3
JG
958 int fd = LTTNG_POLL_GETFD(&thread.events, i);
959 uint32_t revents = LTTNG_POLL_GETEV(&thread.events, i);
db66e574
JD
960
961 DBG("[rotation-thread] Handling fd (%i) activity (%u)",
962 fd, revents);
963
92816cc3
JG
964 if (revents & LPOLLERR) {
965 ERR("[rotation-thread] Polling returned an error on fd %i", fd);
966 goto error;
967 }
968
a7333da7 969 if (sessiond_check_thread_quit_pipe(fd, revents)) {
db66e574 970 DBG("[rotation-thread] Quit pipe activity");
92816cc3 971 /* TODO flush the queue. */
db66e574 972 goto exit;
d88744a4 973 } else if (fd == lttng_pipe_get_readfd(handle->rotation_timer_queue->event_pipe)) {
92816cc3
JG
974 ret = handle_job_queue(handle, &thread,
975 handle->rotation_timer_queue);
d88744a4
JD
976 if (ret) {
977 ERR("[rotation-thread] Failed to handle rotation timer pipe event");
978 goto error;
979 }
90936dcf 980 } else if (fd == rotate_notification_channel->socket) {
92816cc3
JG
981 ret = handle_notification_channel(fd, handle,
982 &thread);
90936dcf 983 if (ret) {
a9577b76 984 ERR("[rotation-thread] Error occurred while handling activity on notification channel socket");
90936dcf
JD
985 goto error;
986 }
db66e574
JD
987 }
988 }
989 }
990exit:
991error:
992 DBG("[rotation-thread] Exit");
92816cc3 993 fini_thread_state(&thread);
db66e574 994 health_unregister(health_sessiond);
03732c32
JG
995 rcu_thread_offline();
996 rcu_unregister_thread();
db66e574
JD
997end:
998 return NULL;
999}
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