Fix: sessiond: rotation thread: fatal error when not finding a session
[lttng-tools.git] / src / bin / lttng-sessiond / rotation-thread.cpp
CommitLineData
db66e574 1/*
ab5be9fa
MJ
2 * Copyright (C) 2017 Julien Desfossez <jdesfossez@efficios.com>
3 * Copyright (C) 2018 Jérémie Galarneau <jeremie.galarneau@efficios.com>
db66e574 4 *
ab5be9fa 5 * SPDX-License-Identifier: GPL-2.0-only
db66e574 6 *
db66e574
JD
7 */
8
9#define _LGPL_SOURCE
10#include <lttng/trigger/trigger.h>
11#include <common/error.h>
12#include <common/config/session-config.h>
13#include <common/defaults.h>
14#include <common/utils.h>
15#include <common/futex.h>
16#include <common/align.h>
17#include <common/time.h>
18#include <common/hashtable/utils.h>
db66e574
JD
19#include <sys/stat.h>
20#include <time.h>
21#include <signal.h>
22#include <inttypes.h>
23
24#include <common/kernel-ctl/kernel-ctl.h>
25#include <lttng/notification/channel-internal.h>
5c408ad8 26#include <lttng/rotate-internal.h>
d3740619 27#include <lttng/location-internal.h>
eb2827a4 28#include <lttng/condition/condition-internal.h>
db66e574
JD
29
30#include "rotation-thread.h"
31#include "lttng-sessiond.h"
32#include "health-sessiond.h"
33#include "rotate.h"
34#include "cmd.h"
35#include "session.h"
8e319828 36#include "timer.h"
17dd1232 37#include "notification-thread-commands.h"
64d9b072
JG
38#include "utils.h"
39#include "thread.h"
db66e574
JD
40
41#include <urcu.h>
42#include <urcu/list.h>
db66e574 43
90936dcf
JD
44struct lttng_notification_channel *rotate_notification_channel = NULL;
45
92816cc3 46struct rotation_thread {
db66e574
JD
47 struct lttng_poll_event events;
48};
49
92816cc3
JG
50struct rotation_thread_job {
51 enum rotation_thread_job_type type;
c7031a2c 52 struct ltt_session *session;
92816cc3
JG
53 /* List member in struct rotation_thread_timer_queue. */
54 struct cds_list_head head;
55};
56
57/*
58 * The timer thread enqueues jobs and wakes up the rotation thread.
59 * When the rotation thread wakes up, it empties the queue.
60 */
61struct rotation_thread_timer_queue {
62 struct lttng_pipe *event_pipe;
63 struct cds_list_head list;
64 pthread_mutex_t lock;
65};
66
67struct rotation_thread_handle {
92816cc3
JG
68 struct rotation_thread_timer_queue *rotation_timer_queue;
69 /* Access to the notification thread cmd_queue */
70 struct notification_thread_handle *notification_thread_handle;
64d9b072
JG
71 /* Thread-specific quit pipe. */
72 struct lttng_pipe *quit_pipe;
92816cc3
JG
73};
74
db66e574 75static
92816cc3 76const char *get_job_type_str(enum rotation_thread_job_type job_type)
db66e574 77{
92816cc3
JG
78 switch (job_type) {
79 case ROTATION_THREAD_JOB_TYPE_CHECK_PENDING_ROTATION:
80 return "CHECK_PENDING_ROTATION";
81 case ROTATION_THREAD_JOB_TYPE_SCHEDULED_ROTATION:
82 return "SCHEDULED_ROTATION";
83 default:
84 abort();
85 }
db66e574
JD
86}
87
92816cc3 88struct rotation_thread_timer_queue *rotation_thread_timer_queue_create(void)
db66e574 89{
92816cc3 90 struct rotation_thread_timer_queue *queue = NULL;
db66e574 91
7966af57 92 queue = (rotation_thread_timer_queue *) zmalloc(sizeof(*queue));
92816cc3
JG
93 if (!queue) {
94 PERROR("Failed to allocate timer rotate queue");
95 goto end;
96 }
db66e574 97
92816cc3
JG
98 queue->event_pipe = lttng_pipe_open(FD_CLOEXEC | O_NONBLOCK);
99 CDS_INIT_LIST_HEAD(&queue->list);
100 pthread_mutex_init(&queue->lock, NULL);
101end:
102 return queue;
db66e574
JD
103}
104
92816cc3
JG
105void rotation_thread_timer_queue_destroy(
106 struct rotation_thread_timer_queue *queue)
db66e574 107{
92816cc3
JG
108 if (!queue) {
109 return;
db66e574
JD
110 }
111
92816cc3
JG
112 lttng_pipe_destroy(queue->event_pipe);
113
114 pthread_mutex_lock(&queue->lock);
a0377dfe 115 LTTNG_ASSERT(cds_list_empty(&queue->list));
92816cc3
JG
116 pthread_mutex_unlock(&queue->lock);
117 pthread_mutex_destroy(&queue->lock);
118 free(queue);
119}
db66e574 120
92816cc3
JG
121/*
122 * Destroy the thread data previously created by the init function.
123 */
124void rotation_thread_handle_destroy(
125 struct rotation_thread_handle *handle)
126{
64d9b072 127 lttng_pipe_destroy(handle->quit_pipe);
db66e574
JD
128 free(handle);
129}
130
131struct rotation_thread_handle *rotation_thread_handle_create(
90936dcf 132 struct rotation_thread_timer_queue *rotation_timer_queue,
c8a9de5a 133 struct notification_thread_handle *notification_thread_handle)
db66e574
JD
134{
135 struct rotation_thread_handle *handle;
136
7966af57 137 handle = (rotation_thread_handle *) zmalloc(sizeof(*handle));
db66e574
JD
138 if (!handle) {
139 goto end;
140 }
141
92816cc3
JG
142 handle->rotation_timer_queue = rotation_timer_queue;
143 handle->notification_thread_handle = notification_thread_handle;
64d9b072
JG
144 handle->quit_pipe = lttng_pipe_open(FD_CLOEXEC);
145 if (!handle->quit_pipe) {
146 goto error;
147 }
92816cc3
JG
148
149end:
150 return handle;
64d9b072
JG
151error:
152 rotation_thread_handle_destroy(handle);
153 return NULL;
92816cc3
JG
154}
155
156/*
157 * Called with the rotation_thread_timer_queue lock held.
158 * Return true if the same timer job already exists in the queue, false if not.
159 */
160static
161bool timer_job_exists(const struct rotation_thread_timer_queue *queue,
c7031a2c
JG
162 enum rotation_thread_job_type job_type,
163 struct ltt_session *session)
92816cc3
JG
164{
165 bool exists = false;
166 struct rotation_thread_job *job;
167
168 cds_list_for_each_entry(job, &queue->list, head) {
c7031a2c 169 if (job->session == session && job->type == job_type) {
92816cc3
JG
170 exists = true;
171 goto end;
db66e574 172 }
db66e574 173 }
92816cc3
JG
174end:
175 return exists;
176}
177
178void rotation_thread_enqueue_job(struct rotation_thread_timer_queue *queue,
c7031a2c
JG
179 enum rotation_thread_job_type job_type,
180 struct ltt_session *session)
92816cc3
JG
181{
182 int ret;
be2956e7 183 const char dummy = '!';
92816cc3
JG
184 struct rotation_thread_job *job = NULL;
185 const char *job_type_str = get_job_type_str(job_type);
186
187 pthread_mutex_lock(&queue->lock);
c7031a2c 188 if (timer_job_exists(queue, job_type, session)) {
92816cc3
JG
189 /*
190 * This timer job is already pending, we don't need to add
191 * it.
192 */
193 goto end;
db66e574 194 }
92816cc3 195
7966af57 196 job = (rotation_thread_job *) zmalloc(sizeof(struct rotation_thread_job));
92816cc3 197 if (!job) {
c7031a2c
JG
198 PERROR("Failed to allocate rotation thread job of type \"%s\" for session \"%s\"",
199 job_type_str, session->name);
92816cc3
JG
200 goto end;
201 }
c7031a2c
JG
202 /* No reason for this to fail as the caller must hold a reference. */
203 (void) session_get(session);
204
205 job->session = session;
92816cc3 206 job->type = job_type;
92816cc3
JG
207 cds_list_add_tail(&job->head, &queue->list);
208
be2956e7
JG
209 ret = lttng_write(lttng_pipe_get_writefd(queue->event_pipe), &dummy,
210 sizeof(dummy));
92816cc3
JG
211 if (ret < 0) {
212 /*
213 * We do not want to block in the timer handler, the job has
214 * been enqueued in the list, the wakeup pipe is probably full,
215 * the job will be processed when the rotation_thread catches
216 * up.
217 */
218 if (errno == EAGAIN || errno == EWOULDBLOCK) {
219 /*
220 * Not an error, but would be surprising and indicate
221 * that the rotation thread can't keep up with the
222 * current load.
223 */
224 DBG("Wake-up pipe of rotation thread job queue is full");
225 goto end;
db66e574 226 }
c7031a2c
JG
227 PERROR("Failed to wake-up the rotation thread after pushing a job of type \"%s\" for session \"%s\"",
228 job_type_str, session->name);
92816cc3 229 goto end;
db66e574 230 }
db66e574
JD
231
232end:
92816cc3 233 pthread_mutex_unlock(&queue->lock);
db66e574
JD
234}
235
236static
237int init_poll_set(struct lttng_poll_event *poll_set,
238 struct rotation_thread_handle *handle)
239{
240 int ret;
241
242 /*
64d9b072
JG
243 * Create pollset with size 3:
244 * - rotation thread quit pipe,
92816cc3 245 * - rotation thread timer queue pipe,
64d9b072 246 * - notification channel sock,
db66e574 247 */
64d9b072
JG
248 ret = lttng_poll_create(poll_set, 5, LTTNG_CLOEXEC);
249 if (ret < 0) {
db66e574
JD
250 goto error;
251 }
64d9b072
JG
252
253 ret = lttng_poll_add(poll_set,
254 lttng_pipe_get_readfd(handle->quit_pipe),
255 LPOLLIN | LPOLLERR);
256 if (ret < 0) {
bd0514a5 257 ERR("Failed to add quit pipe read fd to poll set");
64d9b072
JG
258 goto error;
259 }
260
d086f507
JD
261 ret = lttng_poll_add(poll_set,
262 lttng_pipe_get_readfd(handle->rotation_timer_queue->event_pipe),
263 LPOLLIN | LPOLLERR);
264 if (ret < 0) {
bd0514a5 265 ERR("Failed to add rotate_pending fd to poll set");
d086f507
JD
266 goto error;
267 }
db66e574 268
db66e574
JD
269 return ret;
270error:
271 lttng_poll_clean(poll_set);
272 return ret;
273}
274
275static
92816cc3 276void fini_thread_state(struct rotation_thread *state)
db66e574
JD
277{
278 lttng_poll_clean(&state->events);
90936dcf
JD
279 if (rotate_notification_channel) {
280 lttng_notification_channel_destroy(rotate_notification_channel);
281 }
db66e574
JD
282}
283
284static
285int init_thread_state(struct rotation_thread_handle *handle,
92816cc3 286 struct rotation_thread *state)
db66e574
JD
287{
288 int ret;
289
290 memset(state, 0, sizeof(*state));
291 lttng_poll_init(&state->events);
292
293 ret = init_poll_set(&state->events, handle);
294 if (ret) {
bd0514a5 295 ERR("Failed to initialize rotation thread poll set");
db66e574
JD
296 goto end;
297 }
298
90936dcf
JD
299 rotate_notification_channel = lttng_notification_channel_create(
300 lttng_session_daemon_notification_endpoint);
301 if (!rotate_notification_channel) {
bd0514a5 302 ERR("Could not create notification channel");
90936dcf
JD
303 ret = -1;
304 goto end;
305 }
306 ret = lttng_poll_add(&state->events, rotate_notification_channel->socket,
307 LPOLLIN | LPOLLERR);
308 if (ret < 0) {
bd0514a5 309 ERR("Failed to add notification fd to pollset");
90936dcf
JD
310 goto end;
311 }
312
db66e574
JD
313end:
314 return ret;
315}
316
317static
d2956687
JG
318void check_session_rotation_pending_on_consumers(struct ltt_session *session,
319 bool *_rotation_completed)
92816cc3 320{
db582e11 321 int ret = 0;
92816cc3
JG
322 struct consumer_socket *socket;
323 struct cds_lfht_iter iter;
d2956687
JG
324 enum consumer_trace_chunk_exists_status exists_status;
325 uint64_t relayd_id;
326 bool chunk_exists_on_peer = false;
327 enum lttng_trace_chunk_status chunk_status;
328
a0377dfe 329 LTTNG_ASSERT(session->chunk_being_archived);
92816cc3
JG
330
331 /*
332 * Check for a local pending rotation on all consumers (32-bit
333 * user space, 64-bit user space, and kernel).
334 */
92816cc3
JG
335 rcu_read_lock();
336 if (!session->ust_session) {
337 goto skip_ust;
338 }
339 cds_lfht_for_each_entry(session->ust_session->consumer->socks->ht,
340 &iter, socket, node.node) {
d2956687
JG
341 relayd_id = session->ust_session->consumer->type == CONSUMER_DST_LOCAL ?
342 -1ULL :
343 session->ust_session->consumer->net_seq_index;
344
345 pthread_mutex_lock(socket->lock);
346 ret = consumer_trace_chunk_exists(socket,
347 relayd_id,
348 session->id, session->chunk_being_archived,
349 &exists_status);
350 if (ret) {
351 pthread_mutex_unlock(socket->lock);
83ed9e90 352 ERR("Error occurred while checking rotation status on consumer daemon");
92816cc3 353 goto end;
db66e574 354 }
d2956687 355
16100d7a 356 if (exists_status != CONSUMER_TRACE_CHUNK_EXISTS_STATUS_UNKNOWN_CHUNK) {
d2956687
JG
357 pthread_mutex_unlock(socket->lock);
358 chunk_exists_on_peer = true;
359 goto end;
16100d7a 360 }
d2956687 361 pthread_mutex_unlock(socket->lock);
16100d7a 362 }
db66e574 363
92816cc3
JG
364skip_ust:
365 if (!session->kernel_session) {
366 goto skip_kernel;
db66e574 367 }
92816cc3
JG
368 cds_lfht_for_each_entry(session->kernel_session->consumer->socks->ht,
369 &iter, socket, node.node) {
d2956687
JG
370 pthread_mutex_lock(socket->lock);
371 relayd_id = session->kernel_session->consumer->type == CONSUMER_DST_LOCAL ?
372 -1ULL :
373 session->kernel_session->consumer->net_seq_index;
374
375 ret = consumer_trace_chunk_exists(socket,
376 relayd_id,
377 session->id, session->chunk_being_archived,
378 &exists_status);
379 if (ret) {
380 pthread_mutex_unlock(socket->lock);
83ed9e90 381 ERR("Error occurred while checking rotation status on consumer daemon");
92816cc3
JG
382 goto end;
383 }
d2956687 384
16100d7a 385 if (exists_status != CONSUMER_TRACE_CHUNK_EXISTS_STATUS_UNKNOWN_CHUNK) {
d2956687
JG
386 pthread_mutex_unlock(socket->lock);
387 chunk_exists_on_peer = true;
388 goto end;
16100d7a 389 }
d2956687 390 pthread_mutex_unlock(socket->lock);
92816cc3
JG
391 }
392skip_kernel:
393end:
394 rcu_read_unlock();
db66e574 395
d2956687
JG
396 if (!chunk_exists_on_peer) {
397 uint64_t chunk_being_archived_id;
398
399 chunk_status = lttng_trace_chunk_get_id(
400 session->chunk_being_archived,
401 &chunk_being_archived_id);
a0377dfe 402 LTTNG_ASSERT(chunk_status == LTTNG_TRACE_CHUNK_STATUS_OK);
bd0514a5 403 DBG("Rotation of trace archive %" PRIu64 " of session \"%s\" is complete on all consumers",
d2956687 404 chunk_being_archived_id,
92816cc3 405 session->name);
db66e574 406 }
d2956687 407 *_rotation_completed = !chunk_exists_on_peer;
92816cc3 408 if (ret) {
2961f09e
JG
409 ret = session_reset_rotation_state(session,
410 LTTNG_ROTATION_STATE_ERROR);
411 if (ret) {
412 ERR("Failed to reset rotation state of session \"%s\"",
413 session->name);
414 }
db66e574 415 }
db66e574
JD
416}
417
d88744a4 418/*
92816cc3 419 * Check if the last rotation was completed, called with session lock held.
d2956687
JG
420 * Should only return non-zero in the event of a fatal error. Doing so will
421 * shutdown the thread.
d88744a4
JD
422 */
423static
92816cc3
JG
424int check_session_rotation_pending(struct ltt_session *session,
425 struct notification_thread_handle *notification_thread_handle)
d88744a4
JD
426{
427 int ret;
92816cc3 428 struct lttng_trace_archive_location *location;
d2956687
JG
429 enum lttng_trace_chunk_status chunk_status;
430 bool rotation_completed = false;
431 const char *archived_chunk_name;
432 uint64_t chunk_being_archived_id;
433
dc1d5967
FD
434 if (!session->chunk_being_archived) {
435 ret = 0;
436 goto end;
437 }
438
d2956687
JG
439 chunk_status = lttng_trace_chunk_get_id(session->chunk_being_archived,
440 &chunk_being_archived_id);
a0377dfe 441 LTTNG_ASSERT(chunk_status == LTTNG_TRACE_CHUNK_STATUS_OK);
d88744a4 442
bd0514a5 443 DBG("Checking for pending rotation on session \"%s\", trace archive %" PRIu64,
d2956687
JG
444 session->name, chunk_being_archived_id);
445
faf1bdcf
JG
446 /*
447 * The rotation-pending check timer of a session is launched in
448 * one-shot mode. If the rotation is incomplete, the rotation
449 * thread will re-enable the pending-check timer.
450 *
451 * The timer thread can't stop the timer itself since it is involved
452 * in the check for the timer's quiescence.
453 */
454 ret = timer_session_rotation_pending_check_stop(session);
455 if (ret) {
6ae1bf46 456 goto check_ongoing_rotation;
faf1bdcf
JG
457 }
458
d2956687
JG
459 check_session_rotation_pending_on_consumers(session,
460 &rotation_completed);
d2956687
JG
461 if (!rotation_completed ||
462 session->rotation_state == LTTNG_ROTATION_STATE_ERROR) {
6ae1bf46 463 goto check_ongoing_rotation;
92816cc3
JG
464 }
465
92816cc3
JG
466 /*
467 * Now we can clear the "ONGOING" state in the session. New
468 * rotations can start now.
469 */
d2956687
JG
470 chunk_status = lttng_trace_chunk_get_name(session->chunk_being_archived,
471 &archived_chunk_name, NULL);
a0377dfe 472 LTTNG_ASSERT(chunk_status == LTTNG_TRACE_CHUNK_STATUS_OK);
d2956687
JG
473 free(session->last_archived_chunk_name);
474 session->last_archived_chunk_name = strdup(archived_chunk_name);
475 if (!session->last_archived_chunk_name) {
476 PERROR("Failed to duplicate archived chunk name");
477 }
478 session_reset_rotation_state(session, LTTNG_ROTATION_STATE_COMPLETED);
92816cc3 479
7fdbed1c
JG
480 if (!session->quiet_rotation) {
481 location = session_get_trace_archive_location(session);
7fdbed1c
JG
482 ret = notification_thread_command_session_rotation_completed(
483 notification_thread_handle,
484 session->name,
485 session->uid,
486 session->gid,
487 session->last_archived_chunk_id.value,
488 location);
d3740619 489 lttng_trace_archive_location_put(location);
7fdbed1c 490 if (ret != LTTNG_OK) {
bd0514a5 491 ERR("Failed to notify notification thread of completed rotation for session %s",
7fdbed1c
JG
492 session->name);
493 }
92816cc3
JG
494 }
495
496 ret = 0;
6ae1bf46 497check_ongoing_rotation:
92816cc3 498 if (session->rotation_state == LTTNG_ROTATION_STATE_ONGOING) {
d2956687
JG
499 chunk_status = lttng_trace_chunk_get_id(
500 session->chunk_being_archived,
501 &chunk_being_archived_id);
a0377dfe 502 LTTNG_ASSERT(chunk_status == LTTNG_TRACE_CHUNK_STATUS_OK);
d2956687 503
bd0514a5 504 DBG("Rotation of trace archive %" PRIu64 " is still pending for session %s",
d2956687 505 chunk_being_archived_id, session->name);
92816cc3
JG
506 ret = timer_session_rotation_pending_check_start(session,
507 DEFAULT_ROTATE_PENDING_TIMER);
508 if (ret) {
d2956687 509 ERR("Failed to re-enable rotation pending timer");
92816cc3
JG
510 ret = -1;
511 goto end;
512 }
513 }
514
6ae1bf46 515end:
d88744a4
JD
516 return ret;
517}
518
ed1e52a3 519/* Call with the session and session_list locks held. */
259c2674 520static
92816cc3 521int launch_session_rotation(struct ltt_session *session)
259c2674
JD
522{
523 int ret;
92816cc3 524 struct lttng_rotate_session_return rotation_return;
259c2674 525
bd0514a5 526 DBG("Launching scheduled time-based rotation on session \"%s\"",
92816cc3 527 session->name);
259c2674 528
343defc2
MD
529 ret = cmd_rotate_session(session, &rotation_return, false,
530 LTTNG_TRACE_CHUNK_COMMAND_TYPE_MOVE_TO_COMPLETED);
92816cc3 531 if (ret == LTTNG_OK) {
bd0514a5 532 DBG("Scheduled time-based rotation successfully launched on session \"%s\"",
92816cc3
JG
533 session->name);
534 } else {
535 /* Don't consider errors as fatal. */
bd0514a5 536 DBG("Scheduled time-based rotation aborted for session %s: %s",
92816cc3 537 session->name, lttng_strerror(ret));
259c2674 538 }
92816cc3
JG
539 return 0;
540}
259c2674 541
92816cc3
JG
542static
543int run_job(struct rotation_thread_job *job, struct ltt_session *session,
544 struct notification_thread_handle *notification_thread_handle)
545{
546 int ret;
259c2674 547
92816cc3
JG
548 switch (job->type) {
549 case ROTATION_THREAD_JOB_TYPE_SCHEDULED_ROTATION:
16100d7a 550 ret = launch_session_rotation(session);
92816cc3
JG
551 break;
552 case ROTATION_THREAD_JOB_TYPE_CHECK_PENDING_ROTATION:
553 ret = check_session_rotation_pending(session,
554 notification_thread_handle);
555 break;
556 default:
557 abort();
259c2674 558 }
259c2674
JD
559 return ret;
560}
561
d88744a4 562static
92816cc3
JG
563int handle_job_queue(struct rotation_thread_handle *handle,
564 struct rotation_thread *state,
d88744a4
JD
565 struct rotation_thread_timer_queue *queue)
566{
567 int ret = 0;
d88744a4
JD
568
569 for (;;) {
e32d7f27 570 struct ltt_session *session;
92816cc3 571 struct rotation_thread_job *job;
d88744a4 572
92816cc3 573 /* Take the queue lock only to pop an element from the list. */
d88744a4
JD
574 pthread_mutex_lock(&queue->lock);
575 if (cds_list_empty(&queue->list)) {
576 pthread_mutex_unlock(&queue->lock);
577 break;
578 }
92816cc3
JG
579 job = cds_list_first_entry(&queue->list,
580 typeof(*job), head);
581 cds_list_del(&job->head);
d88744a4
JD
582 pthread_mutex_unlock(&queue->lock);
583
d88744a4 584 session_lock_list();
c7031a2c 585 session = job->session;
d88744a4 586 if (!session) {
bd0514a5 587 DBG("Session \"%s\" not found",
c7031a2c 588 session->name);
d88744a4 589 /*
92816cc3
JG
590 * This is a non-fatal error, and we cannot report it to
591 * the user (timer), so just print the error and
592 * continue the processing.
593 *
594 * While the timer thread will purge pending signals for
595 * a session on the session's destruction, it is
596 * possible for a job targeting that session to have
597 * already been queued before it was destroyed.
d88744a4 598 */
92816cc3 599 free(job);
e32d7f27 600 session_put(session);
5b8139c6 601 session_unlock_list();
d88744a4
JD
602 continue;
603 }
604
d88744a4 605 session_lock(session);
16100d7a 606 ret = run_job(job, session, handle->notification_thread_handle);
d88744a4 607 session_unlock(session);
faf1bdcf 608 /* Release reference held by the job. */
e32d7f27 609 session_put(session);
ed1e52a3 610 session_unlock_list();
92816cc3 611 free(job);
d88744a4 612 if (ret) {
d88744a4
JD
613 goto end;
614 }
615 }
616
617 ret = 0;
618
619end:
620 return ret;
621}
622
92816cc3
JG
623static
624int handle_condition(const struct lttng_condition *condition,
90936dcf
JD
625 const struct lttng_evaluation *evaluation,
626 struct notification_thread_handle *notification_thread_handle)
627{
628 int ret = 0;
629 const char *condition_session_name = NULL;
630 enum lttng_condition_type condition_type;
631 enum lttng_condition_status condition_status;
632 enum lttng_evaluation_status evaluation_status;
633 uint64_t consumed;
634 struct ltt_session *session;
635
636 condition_type = lttng_condition_get_type(condition);
637
638 if (condition_type != LTTNG_CONDITION_TYPE_SESSION_CONSUMED_SIZE) {
639 ret = -1;
bd0514a5 640 ERR("Condition type and session usage type are not the same");
90936dcf
JD
641 goto end;
642 }
643
644 /* Fetch info to test */
645 condition_status = lttng_condition_session_consumed_size_get_session_name(
646 condition, &condition_session_name);
647 if (condition_status != LTTNG_CONDITION_STATUS_OK) {
bd0514a5 648 ERR("Session name could not be fetched");
90936dcf
JD
649 ret = -1;
650 goto end;
651 }
652 evaluation_status = lttng_evaluation_session_consumed_size_get_consumed_size(evaluation,
653 &consumed);
654 if (evaluation_status != LTTNG_EVALUATION_STATUS_OK) {
bd0514a5 655 ERR("Failed to get evaluation");
90936dcf
JD
656 ret = -1;
657 goto end;
658 }
659
660 session_lock_list();
661 session = session_find_by_name(condition_session_name);
662 if (!session) {
eb2827a4
JG
663 DBG("Failed to find session while handling notification: notification type = %s, session name = `%s`",
664 lttng_condition_type_str(condition_type),
90936dcf 665 condition_session_name);
eb2827a4
JG
666 /*
667 * Not a fatal error: a session can be destroyed before we get
668 * the chance to handle the notification.
669 */
670 ret = 0;
671 session_unlock_list();
90936dcf
JD
672 goto end;
673 }
674 session_lock(session);
90936dcf
JD
675
676 ret = unsubscribe_session_consumed_size_rotation(session,
677 notification_thread_handle);
678 if (ret) {
490b3229 679 goto end_unlock;
90936dcf
JD
680 }
681
343defc2
MD
682 ret = cmd_rotate_session(session, NULL, false,
683 LTTNG_TRACE_CHUNK_COMMAND_TYPE_MOVE_TO_COMPLETED);
90936dcf
JD
684 if (ret == -LTTNG_ERR_ROTATION_PENDING) {
685 DBG("Rotate already pending, subscribe to the next threshold value");
90936dcf 686 } else if (ret != LTTNG_OK) {
bd0514a5 687 ERR("Failed to rotate on size notification with error: %s",
90936dcf
JD
688 lttng_strerror(ret));
689 ret = -1;
690 goto end_unlock;
691 }
692 ret = subscribe_session_consumed_size_rotation(session,
693 consumed + session->rotate_size,
694 notification_thread_handle);
695 if (ret) {
bd0514a5 696 ERR("Failed to subscribe to session consumed size condition");
90936dcf
JD
697 goto end_unlock;
698 }
699 ret = 0;
700
701end_unlock:
702 session_unlock(session);
e32d7f27 703 session_put(session);
5b8139c6 704 session_unlock_list();
90936dcf
JD
705end:
706 return ret;
707}
708
709static
92816cc3 710int handle_notification_channel(int fd,
90936dcf 711 struct rotation_thread_handle *handle,
92816cc3 712 struct rotation_thread *state)
90936dcf
JD
713{
714 int ret;
d73ee93f
JG
715 bool notification_pending;
716 struct lttng_notification *notification = NULL;
90936dcf
JD
717 enum lttng_notification_channel_status status;
718 const struct lttng_evaluation *notification_evaluation;
719 const struct lttng_condition *notification_condition;
720
d73ee93f
JG
721 status = lttng_notification_channel_has_pending_notification(
722 rotate_notification_channel, &notification_pending);
723 if (status != LTTNG_NOTIFICATION_CHANNEL_STATUS_OK) {
bd0514a5 724 ERR("Error occurred while checking for pending notification");
d73ee93f
JG
725 ret = -1;
726 goto end;
727 }
728
729 if (!notification_pending) {
730 ret = 0;
731 goto end;
732 }
733
90936dcf
JD
734 /* Receive the next notification. */
735 status = lttng_notification_channel_get_next_notification(
736 rotate_notification_channel,
737 &notification);
738
739 switch (status) {
740 case LTTNG_NOTIFICATION_CHANNEL_STATUS_OK:
741 break;
742 case LTTNG_NOTIFICATION_CHANNEL_STATUS_NOTIFICATIONS_DROPPED:
743 /* Not an error, we will wait for the next one */
744 ret = 0;
745 goto end;;
746 case LTTNG_NOTIFICATION_CHANNEL_STATUS_CLOSED:
747 ERR("Notification channel was closed");
748 ret = -1;
749 goto end;
750 default:
751 /* Unhandled conditions / errors. */
752 ERR("Unknown notification channel status");
753 ret = -1;
754 goto end;
755 }
756
757 notification_condition = lttng_notification_get_condition(notification);
758 notification_evaluation = lttng_notification_get_evaluation(notification);
759
760 ret = handle_condition(notification_condition, notification_evaluation,
761 handle->notification_thread_handle);
762
763end:
764 lttng_notification_destroy(notification);
90936dcf
JD
765 return ret;
766}
767
2c0c9bbc 768static
db66e574
JD
769void *thread_rotation(void *data)
770{
771 int ret;
7966af57 772 struct rotation_thread_handle *handle = (rotation_thread_handle *) data;
92816cc3 773 struct rotation_thread thread;
87380d40 774 int queue_pipe_fd;
db66e574 775
bd0514a5 776 DBG("Started rotation thread");
f620cc28
JG
777 rcu_register_thread();
778 rcu_thread_online();
412d7227 779 health_register(the_health_sessiond, HEALTH_SESSIOND_TYPE_ROTATION);
f620cc28 780 health_code_update();
db66e574
JD
781
782 if (!handle) {
bd0514a5 783 ERR("Invalid thread context provided");
db66e574
JD
784 goto end;
785 }
786
87380d40
JR
787 queue_pipe_fd = lttng_pipe_get_readfd(
788 handle->rotation_timer_queue->event_pipe);
789
db66e574 790
92816cc3 791 ret = init_thread_state(handle, &thread);
db66e574 792 if (ret) {
f5f8e5cd 793 goto error;
db66e574
JD
794 }
795
db66e574
JD
796 while (true) {
797 int fd_count, i;
798
799 health_poll_entry();
bd0514a5 800 DBG("Entering poll wait");
92816cc3 801 ret = lttng_poll_wait(&thread.events, -1);
bd0514a5 802 DBG("Poll wait returned (%i)", ret);
db66e574
JD
803 health_poll_exit();
804 if (ret < 0) {
805 /*
806 * Restart interrupted system call.
807 */
808 if (errno == EINTR) {
809 continue;
810 }
bd0514a5 811 ERR("Error encountered during lttng_poll_wait (%i)", ret);
db66e574
JD
812 goto error;
813 }
814
815 fd_count = ret;
816 for (i = 0; i < fd_count; i++) {
92816cc3
JG
817 int fd = LTTNG_POLL_GETFD(&thread.events, i);
818 uint32_t revents = LTTNG_POLL_GETEV(&thread.events, i);
db66e574 819
bd0514a5 820 DBG("Handling fd (%i) activity (%u)",
db66e574
JD
821 fd, revents);
822
92816cc3 823 if (revents & LPOLLERR) {
bd0514a5 824 ERR("Polling returned an error on fd %i", fd);
92816cc3
JG
825 goto error;
826 }
827
85e17b27
JG
828 if (fd == rotate_notification_channel->socket) {
829 ret = handle_notification_channel(fd, handle,
830 &thread);
831 if (ret) {
bd0514a5 832 ERR("Error occurred while handling activity on notification channel socket");
85e17b27
JG
833 goto error;
834 }
835 } else {
836 /* Job queue or quit pipe activity. */
85e17b27
JG
837
838 /*
839 * The job queue is serviced if there is
840 * activity on the quit pipe to ensure it is
841 * flushed and all references held in the queue
842 * are released.
843 */
92816cc3
JG
844 ret = handle_job_queue(handle, &thread,
845 handle->rotation_timer_queue);
d88744a4 846 if (ret) {
bd0514a5 847 ERR("Failed to handle rotation timer pipe event");
d88744a4
JD
848 goto error;
849 }
85e17b27 850
64d9b072
JG
851 if (fd == queue_pipe_fd) {
852 char buf;
853
854 ret = lttng_read(fd, &buf, 1);
855 if (ret != 1) {
bd0514a5 856 ERR("Failed to read from wakeup pipe (fd = %i)", fd);
64d9b072
JG
857 goto error;
858 }
859 } else {
bd0514a5 860 DBG("Quit pipe activity");
85e17b27 861 goto exit;
90936dcf 862 }
db66e574
JD
863 }
864 }
865 }
866exit:
867error:
bd0514a5 868 DBG("Thread exit");
92816cc3 869 fini_thread_state(&thread);
f620cc28 870end:
412d7227 871 health_unregister(the_health_sessiond);
03732c32
JG
872 rcu_thread_offline();
873 rcu_unregister_thread();
db66e574
JD
874 return NULL;
875}
64d9b072
JG
876
877static
878bool shutdown_rotation_thread(void *thread_data)
879{
7966af57 880 struct rotation_thread_handle *handle = (rotation_thread_handle *) thread_data;
64d9b072
JG
881 const int write_fd = lttng_pipe_get_writefd(handle->quit_pipe);
882
883 return notify_thread_pipe(write_fd) == 1;
884}
885
886bool launch_rotation_thread(struct rotation_thread_handle *handle)
887{
888 struct lttng_thread *thread;
889
890 thread = lttng_thread_create("Rotation",
891 thread_rotation,
892 shutdown_rotation_thread,
893 NULL,
894 handle);
895 if (!thread) {
896 goto error;
897 }
898 lttng_thread_put(thread);
899 return true;
900error:
901 return false;
902}
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