common: credentials: hide symbols
[lttng-tools.git] / src / bin / lttng-sessiond / session.c
CommitLineData
5b74c7b1 1/*
ab5be9fa 2 * Copyright (C) 2011 David Goulet <david.goulet@polymtl.ca>
5b74c7b1 3 *
ab5be9fa 4 * SPDX-License-Identifier: GPL-2.0-only
91d76f53 5 *
5b74c7b1
DG
6 */
7
6c1c0768 8#define _LGPL_SOURCE
6c9cc2ab 9#include <limits.h>
d022620a 10#include <inttypes.h>
5b74c7b1
DG
11#include <stdio.h>
12#include <stdlib.h>
13#include <string.h>
a304c14c 14#include <sys/stat.h>
f6a9efaa 15#include <urcu.h>
3d071855
MD
16#include <dirent.h>
17#include <sys/types.h>
99d688f2 18#include <pthread.h>
5b74c7b1 19
990570ed 20#include <common/common.h>
82b69413
JG
21#include <common/utils.h>
22#include <common/trace-chunk.h>
db758600 23#include <common/sessiond-comm/sessiond-comm.h>
5d65beab 24#include <lttng/location-internal.h>
e32d7f27
JG
25#include "lttng-sessiond.h"
26#include "kernel.h"
1e307fab 27
5b74c7b1 28#include "session.h"
23324029 29#include "utils.h"
dd73d57b 30#include "trace-ust.h"
a7333da7 31#include "timer.h"
7fdbed1c 32#include "cmd.h"
5b74c7b1 33
3e3665b8
JG
34struct ltt_session_destroy_notifier_element {
35 ltt_session_destroy_notifier notifier;
36 void *user_data;
37};
38
ccbdaca4
MD
39struct ltt_session_clear_notifier_element {
40 ltt_session_clear_notifier notifier;
41 void *user_data;
42};
43
8c0faa1d 44/*
b5541356 45 * NOTES:
8c0faa1d 46 *
b5541356
DG
47 * No ltt_session.lock is taken here because those data structure are widely
48 * spread across the lttng-tools code base so before caling functions below
49 * that can read/write a session, the caller MUST acquire the session lock
54d01ffb 50 * using session_lock() and session_unlock().
8c0faa1d 51 */
8c0faa1d 52
5b74c7b1 53/*
b5541356 54 * Init tracing session list.
5b74c7b1 55 *
b5541356 56 * Please see session.h for more explanation and correct usage of the list.
5b74c7b1 57 */
b5541356
DG
58static struct ltt_session_list ltt_session_list = {
59 .head = CDS_LIST_HEAD_INIT(ltt_session_list.head),
60 .lock = PTHREAD_MUTEX_INITIALIZER,
99d688f2 61 .removal_cond = PTHREAD_COND_INITIALIZER,
a24f7994 62 .next_uuid = 0,
b5541356 63};
5b74c7b1 64
1c1c3634
DG
65/* These characters are forbidden in a session name. Used by validate_name. */
66static const char *forbidden_name_chars = "/";
67
23324029
JD
68/* Global hash table to keep the sessions, indexed by id. */
69static struct lttng_ht *ltt_sessions_ht_by_id = NULL;
70
1c1c3634
DG
71/*
72 * Validate the session name for forbidden characters.
73 *
74 * Return 0 on success else -1 meaning a forbidden char. has been found.
75 */
76static int validate_name(const char *name)
77{
78 int ret;
79 char *tok, *tmp_name;
80
81 assert(name);
82
83 tmp_name = strdup(name);
84 if (!tmp_name) {
85 /* ENOMEM here. */
86 ret = -1;
87 goto error;
88 }
89
90 tok = strpbrk(tmp_name, forbidden_name_chars);
91 if (tok) {
92 DBG("Session name %s contains a forbidden character", name);
93 /* Forbidden character has been found. */
94 ret = -1;
95 goto error;
96 }
97 ret = 0;
98
99error:
100 free(tmp_name);
101 return ret;
102}
103
5b74c7b1 104/*
050349bb 105 * Add a ltt_session structure to the global list.
5b74c7b1 106 *
050349bb 107 * The caller MUST acquire the session list lock before.
44e96653 108 * Returns the unique identifier for the session.
5b74c7b1 109 */
d022620a 110static uint64_t add_session_list(struct ltt_session *ls)
5b74c7b1 111{
0525e9ae
DG
112 assert(ls);
113
5b74c7b1 114 cds_list_add(&ls->list, &ltt_session_list.head);
a24f7994 115 return ltt_session_list.next_uuid++;
5b74c7b1
DG
116}
117
118/*
050349bb 119 * Delete a ltt_session structure to the global list.
b5541356 120 *
050349bb 121 * The caller MUST acquire the session list lock before.
5b74c7b1
DG
122 */
123static void del_session_list(struct ltt_session *ls)
124{
0525e9ae
DG
125 assert(ls);
126
5b74c7b1 127 cds_list_del(&ls->list);
5b74c7b1
DG
128}
129
b5541356 130/*
050349bb 131 * Return a pointer to the session list.
b5541356 132 */
54d01ffb 133struct ltt_session_list *session_get_list(void)
b5541356
DG
134{
135 return &ltt_session_list;
136}
137
99d688f2
JG
138/*
139 * Returns once the session list is empty.
140 */
141void session_list_wait_empty(void)
142{
143 pthread_mutex_lock(&ltt_session_list.lock);
144 while (!cds_list_empty(&ltt_session_list.head)) {
145 pthread_cond_wait(&ltt_session_list.removal_cond,
146 &ltt_session_list.lock);
147 }
148 pthread_mutex_unlock(&ltt_session_list.lock);
149}
150
b5541356 151/*
6c9cc2ab 152 * Acquire session list lock
b5541356 153 */
54d01ffb 154void session_lock_list(void)
b5541356 155{
6c9cc2ab 156 pthread_mutex_lock(&ltt_session_list.lock);
b5541356
DG
157}
158
71e0a100
JG
159/*
160 * Try to acquire session list lock
161 */
162int session_trylock_list(void)
163{
164 return pthread_mutex_trylock(&ltt_session_list.lock);
165}
166
b5541356 167/*
6c9cc2ab 168 * Release session list lock
b5541356 169 */
54d01ffb 170void session_unlock_list(void)
b5541356 171{
6c9cc2ab 172 pthread_mutex_unlock(&ltt_session_list.lock);
b5541356
DG
173}
174
dd73d57b
JG
175/*
176 * Get the session's consumer destination type.
177 *
178 * The caller must hold the session lock.
179 */
180enum consumer_dst_type session_get_consumer_destination_type(
181 const struct ltt_session *session)
182{
183 /*
184 * The output information is duplicated in both of those session types.
185 * Hence, it doesn't matter from which it is retrieved. However, it is
186 * possible for only one of them to be set.
187 */
188 return session->kernel_session ?
189 session->kernel_session->consumer->type :
190 session->ust_session->consumer->type;
191}
192
193/*
194 * Get the session's consumer network hostname.
195 * The caller must ensure that the destination is of type "net".
196 *
197 * The caller must hold the session lock.
198 */
199const char *session_get_net_consumer_hostname(const struct ltt_session *session)
200{
201 const char *hostname = NULL;
202 const struct consumer_output *output;
203
204 output = session->kernel_session ?
205 session->kernel_session->consumer :
206 session->ust_session->consumer;
207
208 /*
209 * hostname is assumed to be the same for both control and data
210 * connections.
211 */
212 switch (output->dst.net.control.dtype) {
213 case LTTNG_DST_IPV4:
214 hostname = output->dst.net.control.dst.ipv4;
215 break;
216 case LTTNG_DST_IPV6:
217 hostname = output->dst.net.control.dst.ipv6;
218 break;
219 default:
220 abort();
221 }
222 return hostname;
223}
224
225/*
226 * Get the session's consumer network control and data ports.
227 * The caller must ensure that the destination is of type "net".
228 *
229 * The caller must hold the session lock.
230 */
231void session_get_net_consumer_ports(const struct ltt_session *session,
232 uint16_t *control_port, uint16_t *data_port)
233{
234 const struct consumer_output *output;
235
236 output = session->kernel_session ?
237 session->kernel_session->consumer :
238 session->ust_session->consumer;
239 *control_port = output->dst.net.control.port;
240 *data_port = output->dst.net.data.port;
241}
242
5d65beab
JG
243/*
244 * Get the location of the latest trace archive produced by a rotation.
245 *
246 * The caller must hold the session lock.
247 */
248struct lttng_trace_archive_location *session_get_trace_archive_location(
3e3665b8 249 const struct ltt_session *session)
5d65beab 250{
d2956687 251 int ret;
5d65beab 252 struct lttng_trace_archive_location *location = NULL;
d2956687
JG
253 char *chunk_path = NULL;
254
255 if (session->rotation_state != LTTNG_ROTATION_STATE_COMPLETED ||
256 !session->last_archived_chunk_name) {
257 goto end;
258 }
5d65beab 259
5d65beab
JG
260 switch (session_get_consumer_destination_type(session)) {
261 case CONSUMER_DST_LOCAL:
ecd1a12f
MD
262 ret = asprintf(&chunk_path,
263 "%s/" DEFAULT_ARCHIVED_TRACE_CHUNKS_DIRECTORY "/%s",
264 session_get_base_path(session),
265 session->last_archived_chunk_name);
266 if (ret == -1) {
267 goto end;
268 }
5d65beab 269 location = lttng_trace_archive_location_local_create(
d2956687 270 chunk_path);
5d65beab
JG
271 break;
272 case CONSUMER_DST_NET:
273 {
274 const char *hostname;
275 uint16_t control_port, data_port;
276
277 hostname = session_get_net_consumer_hostname(session);
278 session_get_net_consumer_ports(session,
279 &control_port,
280 &data_port);
281 location = lttng_trace_archive_location_relay_create(
282 hostname,
283 LTTNG_TRACE_ARCHIVE_LOCATION_RELAY_PROTOCOL_TYPE_TCP,
ecd1a12f 284 control_port, data_port, session->last_chunk_path);
5d65beab
JG
285 break;
286 }
287 default:
288 abort();
289 }
290end:
d2956687 291 free(chunk_path);
5d65beab
JG
292 return location;
293}
294
23324029
JD
295/*
296 * Allocate the ltt_sessions_ht_by_id HT.
9c6518bc
JG
297 *
298 * The session list lock must be held.
23324029 299 */
f848281f 300static int ltt_sessions_ht_alloc(void)
23324029
JD
301{
302 int ret = 0;
303
304 DBG("Allocating ltt_sessions_ht_by_id");
305 ltt_sessions_ht_by_id = lttng_ht_new(0, LTTNG_HT_TYPE_U64);
306 if (!ltt_sessions_ht_by_id) {
307 ret = -1;
308 ERR("Failed to allocate ltt_sessions_ht_by_id");
309 goto end;
310 }
311end:
312 return ret;
313}
314
315/*
316 * Destroy the ltt_sessions_ht_by_id HT.
9c6518bc
JG
317 *
318 * The session list lock must be held.
23324029 319 */
accdc9bf 320static void ltt_sessions_ht_destroy(void)
23324029
JD
321{
322 if (!ltt_sessions_ht_by_id) {
323 return;
324 }
325 ht_cleanup_push(ltt_sessions_ht_by_id);
326 ltt_sessions_ht_by_id = NULL;
327}
328
329/*
330 * Add a ltt_session to the ltt_sessions_ht_by_id.
331 * If unallocated, the ltt_sessions_ht_by_id HT is allocated.
332 * The session list lock must be held.
333 */
334static void add_session_ht(struct ltt_session *ls)
335{
336 int ret;
337
338 assert(ls);
339
340 if (!ltt_sessions_ht_by_id) {
341 ret = ltt_sessions_ht_alloc();
342 if (ret) {
343 ERR("Error allocating the sessions HT");
344 goto end;
345 }
346 }
347 lttng_ht_node_init_u64(&ls->node, ls->id);
348 lttng_ht_add_unique_u64(ltt_sessions_ht_by_id, &ls->node);
349
350end:
351 return;
352}
353
354/*
355 * Test if ltt_sessions_ht_by_id is empty.
356 * Return 1 if empty, 0 if not empty.
357 * The session list lock must be held.
358 */
def88971 359static int ltt_sessions_ht_empty(void)
23324029
JD
360{
361 int ret;
362
363 if (!ltt_sessions_ht_by_id) {
364 ret = 1;
365 goto end;
366 }
367
368 ret = lttng_ht_get_count(ltt_sessions_ht_by_id) ? 0 : 1;
369end:
370 return ret;
371}
372
373/*
374 * Remove a ltt_session from the ltt_sessions_ht_by_id.
375 * If empty, the ltt_sessions_ht_by_id HT is freed.
376 * The session list lock must be held.
377 */
378static void del_session_ht(struct ltt_session *ls)
379{
380 struct lttng_ht_iter iter;
381 int ret;
382
383 assert(ls);
384 assert(ltt_sessions_ht_by_id);
385
386 iter.iter.node = &ls->node.node;
387 ret = lttng_ht_del(ltt_sessions_ht_by_id, &iter);
388 assert(!ret);
389
390 if (ltt_sessions_ht_empty()) {
391 DBG("Empty ltt_sessions_ht_by_id, destroying it");
392 ltt_sessions_ht_destroy();
393 }
394}
395
b5541356 396/*
6c9cc2ab 397 * Acquire session lock
b5541356 398 */
54d01ffb 399void session_lock(struct ltt_session *session)
b5541356 400{
0525e9ae
DG
401 assert(session);
402
6c9cc2ab
DG
403 pthread_mutex_lock(&session->lock);
404}
b5541356 405
6c9cc2ab
DG
406/*
407 * Release session lock
408 */
54d01ffb 409void session_unlock(struct ltt_session *session)
6c9cc2ab 410{
0525e9ae
DG
411 assert(session);
412
6c9cc2ab 413 pthread_mutex_unlock(&session->lock);
b5541356
DG
414}
415
82b69413
JG
416static
417int _session_set_trace_chunk_no_lock_check(struct ltt_session *session,
d2956687
JG
418 struct lttng_trace_chunk *new_trace_chunk,
419 struct lttng_trace_chunk **_current_trace_chunk)
82b69413 420{
78fc586b 421 int ret = 0;
82b69413 422 unsigned int i, refs_to_acquire = 0, refs_acquired = 0, refs_to_release = 0;
82b69413
JG
423 struct cds_lfht_iter iter;
424 struct consumer_socket *socket;
d2956687
JG
425 struct lttng_trace_chunk *current_trace_chunk;
426 uint64_t chunk_id;
427 enum lttng_trace_chunk_status chunk_status;
82b69413 428
d2956687 429 rcu_read_lock();
82b69413 430 /*
d2956687
JG
431 * Ownership of current trace chunk is transferred to
432 * `current_trace_chunk`.
82b69413 433 */
d2956687
JG
434 current_trace_chunk = session->current_trace_chunk;
435 session->current_trace_chunk = NULL;
82b69413 436 if (session->ust_session) {
d2956687
JG
437 lttng_trace_chunk_put(
438 session->ust_session->current_trace_chunk);
439 session->ust_session->current_trace_chunk = NULL;
82b69413
JG
440 }
441 if (session->kernel_session) {
d2956687
JG
442 lttng_trace_chunk_put(
443 session->kernel_session->current_trace_chunk);
444 session->kernel_session->current_trace_chunk = NULL;
82b69413 445 }
d2956687
JG
446 if (!new_trace_chunk) {
447 ret = 0;
448 goto end;
82b69413 449 }
d2956687
JG
450 chunk_status = lttng_trace_chunk_get_id(new_trace_chunk, &chunk_id);
451 assert(chunk_status == LTTNG_TRACE_CHUNK_STATUS_OK);
82b69413 452
d2956687
JG
453 refs_to_acquire = 1;
454 refs_to_acquire += !!session->ust_session;
455 refs_to_acquire += !!session->kernel_session;
456
457 for (refs_acquired = 0; refs_acquired < refs_to_acquire;
458 refs_acquired++) {
459 if (!lttng_trace_chunk_get(new_trace_chunk)) {
460 ERR("Failed to acquire reference to new trace chunk of session \"%s\"",
461 session->name);
462 goto error;
82b69413
JG
463 }
464 }
465
d2956687 466 if (session->ust_session) {
e5add6d0
JG
467 const uint64_t relayd_id =
468 session->ust_session->consumer->net_seq_index;
469 const bool is_local_trace =
470 session->ust_session->consumer->type ==
471 CONSUMER_DST_LOCAL;
472
d2956687 473 session->ust_session->current_trace_chunk = new_trace_chunk;
f8a37411 474 if (is_local_trace) {
d2956687 475 enum lttng_error_code ret_error_code;
82b69413 476
d2956687
JG
477 ret_error_code = ust_app_create_channel_subdirectories(
478 session->ust_session);
479 if (ret_error_code != LTTNG_OK) {
82b69413
JG
480 goto error;
481 }
f8a37411 482 }
d2956687
JG
483 cds_lfht_for_each_entry(
484 session->ust_session->consumer->socks->ht,
485 &iter, socket, node.node) {
486 pthread_mutex_lock(socket->lock);
487 ret = consumer_create_trace_chunk(socket,
488 relayd_id,
5da88b0f
MD
489 session->id, new_trace_chunk,
490 DEFAULT_UST_TRACE_DIR);
d2956687 491 pthread_mutex_unlock(socket->lock);
f8a37411 492 if (ret) {
d2956687 493 goto error;
f8a37411
JG
494 }
495 }
496 }
82b69413 497 if (session->kernel_session) {
e5add6d0
JG
498 const uint64_t relayd_id =
499 session->kernel_session->consumer->net_seq_index;
500 const bool is_local_trace =
501 session->kernel_session->consumer->type ==
502 CONSUMER_DST_LOCAL;
503
d2956687
JG
504 session->kernel_session->current_trace_chunk = new_trace_chunk;
505 if (is_local_trace) {
506 enum lttng_error_code ret_error_code;
507
508 ret_error_code = kernel_create_channel_subdirectories(
509 session->kernel_session);
510 if (ret_error_code != LTTNG_OK) {
d2956687
JG
511 goto error;
512 }
f8a37411 513 }
d2956687
JG
514 cds_lfht_for_each_entry(
515 session->kernel_session->consumer->socks->ht,
516 &iter, socket, node.node) {
517 pthread_mutex_lock(socket->lock);
518 ret = consumer_create_trace_chunk(socket,
519 relayd_id,
5da88b0f
MD
520 session->id, new_trace_chunk,
521 DEFAULT_KERNEL_TRACE_DIR);
d2956687 522 pthread_mutex_unlock(socket->lock);
f8a37411 523 if (ret) {
d2956687 524 goto error;
f8a37411
JG
525 }
526 }
527 }
82b69413
JG
528
529 /*
530 * Update local current trace chunk state last, only if all remote
d2956687 531 * creations succeeded.
82b69413
JG
532 */
533 session->current_trace_chunk = new_trace_chunk;
d2956687
JG
534 LTTNG_OPTIONAL_SET(&session->most_recent_chunk_id, chunk_id);
535end:
536 if (_current_trace_chunk) {
537 *_current_trace_chunk = current_trace_chunk;
538 current_trace_chunk = NULL;
539 }
540end_no_move:
541 rcu_read_unlock();
542 lttng_trace_chunk_put(current_trace_chunk);
543 return ret;
544error:
82b69413 545 if (session->ust_session) {
d2956687 546 session->ust_session->current_trace_chunk = NULL;
82b69413
JG
547 }
548 if (session->kernel_session) {
d2956687 549 session->kernel_session->current_trace_chunk = NULL;
82b69413 550 }
f8a37411 551 /*
82b69413
JG
552 * Release references taken in the case where all references could not
553 * be acquired.
554 */
555 refs_to_release = refs_to_acquire - refs_acquired;
556 for (i = 0; i < refs_to_release; i++) {
557 lttng_trace_chunk_put(new_trace_chunk);
558 }
d2956687
JG
559 ret = -1;
560 goto end_no_move;
82b69413
JG
561}
562
d2956687 563struct lttng_trace_chunk *session_create_new_trace_chunk(
348a81dc
JG
564 const struct ltt_session *session,
565 const struct consumer_output *consumer_output_override,
82b69413
JG
566 const char *session_base_path_override,
567 const char *chunk_name_override)
568{
569 int ret;
82b69413
JG
570 struct lttng_trace_chunk *trace_chunk = NULL;
571 enum lttng_trace_chunk_status chunk_status;
d2956687 572 const time_t chunk_creation_ts = time(NULL);
348a81dc
JG
573 bool is_local_trace;
574 const char *base_path;
cbf53d23 575 struct lttng_directory_handle *session_output_directory = NULL;
82b69413 576 const struct lttng_credentials session_credentials = {
ff588497
JR
577 .uid = LTTNG_OPTIONAL_INIT_VALUE(session->uid),
578 .gid = LTTNG_OPTIONAL_INIT_VALUE(session->gid),
82b69413
JG
579 };
580 uint64_t next_chunk_id;
348a81dc 581 const struct consumer_output *output;
a7ceb342 582 const char *new_path;
348a81dc
JG
583
584 if (consumer_output_override) {
585 output = consumer_output_override;
586 } else {
587 assert(session->ust_session || session->kernel_session);
588 output = session->ust_session ?
589 session->ust_session->consumer :
590 session->kernel_session->consumer;
591 }
592
593 is_local_trace = output->type == CONSUMER_DST_LOCAL;
594 base_path = session_base_path_override ? :
595 consumer_output_get_base_path(output);
82b69413 596
d2956687
JG
597 if (chunk_creation_ts == (time_t) -1) {
598 PERROR("Failed to sample time while creation session \"%s\" trace chunk",
82b69413 599 session->name);
82b69413
JG
600 goto error;
601 }
82b69413 602
d2956687
JG
603 next_chunk_id = session->most_recent_chunk_id.is_set ?
604 session->most_recent_chunk_id.value + 1 : 0;
82b69413 605
a7ceb342
MD
606 if (session->current_trace_chunk &&
607 !lttng_trace_chunk_get_name_overridden(session->current_trace_chunk)) {
608 chunk_status = lttng_trace_chunk_rename_path(session->current_trace_chunk,
609 DEFAULT_CHUNK_TMP_OLD_DIRECTORY);
610 if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) {
611 goto error;
612 }
613 }
614 if (!session->current_trace_chunk) {
615 if (!session->rotated) {
616 new_path = "";
617 } else {
618 new_path = NULL;
619 }
620 } else {
621 new_path = DEFAULT_CHUNK_TMP_NEW_DIRECTORY;
622 }
623
d2956687 624 trace_chunk = lttng_trace_chunk_create(next_chunk_id,
a7ceb342 625 chunk_creation_ts, new_path);
82b69413 626 if (!trace_chunk) {
82b69413
JG
627 goto error;
628 }
629
630 if (chunk_name_override) {
631 chunk_status = lttng_trace_chunk_override_name(trace_chunk,
632 chunk_name_override);
d2956687 633 if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) {
82b69413
JG
634 goto error;
635 }
636 }
637
638 if (!is_local_trace) {
639 /*
640 * No need to set crendentials and output directory
641 * for remote trace chunks.
642 */
d2956687 643 goto end;
82b69413
JG
644 }
645
646 chunk_status = lttng_trace_chunk_set_credentials(trace_chunk,
647 &session_credentials);
648 if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) {
82b69413
JG
649 goto error;
650 }
651
d2956687
JG
652 DBG("Creating base output directory of session \"%s\" at %s",
653 session->name, base_path);
82b69413
JG
654 ret = utils_mkdir_recursive(base_path, S_IRWXU | S_IRWXG,
655 session->uid, session->gid);
656 if (ret) {
82b69413
JG
657 goto error;
658 }
cbf53d23
JG
659 session_output_directory = lttng_directory_handle_create(base_path);
660 if (!session_output_directory) {
82b69413
JG
661 goto error;
662 }
663 chunk_status = lttng_trace_chunk_set_as_owner(trace_chunk,
cbf53d23
JG
664 session_output_directory);
665 lttng_directory_handle_put(session_output_directory);
666 session_output_directory = NULL;
82b69413 667 if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) {
82b69413
JG
668 goto error;
669 }
d2956687
JG
670end:
671 return trace_chunk;
82b69413 672error:
cbf53d23 673 lttng_directory_handle_put(session_output_directory);
82b69413 674 lttng_trace_chunk_put(trace_chunk);
d2956687
JG
675 trace_chunk = NULL;
676 goto end;
677}
678
343defc2 679int session_close_trace_chunk(struct ltt_session *session,
bbc4768c 680 struct lttng_trace_chunk *trace_chunk,
343defc2 681 enum lttng_trace_chunk_command_type close_command,
ecd1a12f 682 char *closed_trace_chunk_path)
d2956687
JG
683{
684 int ret = 0;
685 bool error_occurred = false;
686 struct cds_lfht_iter iter;
687 struct consumer_socket *socket;
688 enum lttng_trace_chunk_status chunk_status;
689 const time_t chunk_close_timestamp = time(NULL);
a7ceb342 690 const char *new_path;
d2956687 691
343defc2
MD
692 chunk_status = lttng_trace_chunk_set_close_command(
693 trace_chunk, close_command);
694 if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) {
695 ret = -1;
696 goto end;
bbc4768c
JG
697 }
698
d2956687
JG
699 if (chunk_close_timestamp == (time_t) -1) {
700 ERR("Failed to sample the close timestamp of the current trace chunk of session \"%s\"",
701 session->name);
702 ret = -1;
703 goto end;
704 }
a7ceb342
MD
705
706 if (close_command == LTTNG_TRACE_CHUNK_COMMAND_TYPE_DELETE && !session->rotated) {
707 /* New chunk stays in session output directory. */
708 new_path = "";
709 } else {
710 /* Use chunk name for new chunk. */
711 new_path = NULL;
712 }
713 if (session->current_trace_chunk &&
714 !lttng_trace_chunk_get_name_overridden(session->current_trace_chunk)) {
715 /* Rename new chunk path. */
716 chunk_status = lttng_trace_chunk_rename_path(session->current_trace_chunk,
717 new_path);
718 if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) {
719 ret = -1;
720 goto end;
721 }
722 }
723 if (!lttng_trace_chunk_get_name_overridden(trace_chunk) &&
724 close_command == LTTNG_TRACE_CHUNK_COMMAND_TYPE_NO_OPERATION) {
725 const char *old_path;
726
727 if (!session->rotated) {
728 old_path = "";
729 } else {
730 old_path = NULL;
731 }
732 /* We need to move back the .tmp_old_chunk to its rightful place. */
733 chunk_status = lttng_trace_chunk_rename_path(trace_chunk,
734 old_path);
735 if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) {
736 ret = -1;
737 goto end;
738 }
739 }
740 if (close_command == LTTNG_TRACE_CHUNK_COMMAND_TYPE_MOVE_TO_COMPLETED) {
741 session->rotated = true;
742 }
d2956687
JG
743 chunk_status = lttng_trace_chunk_set_close_timestamp(trace_chunk,
744 chunk_close_timestamp);
745 if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) {
746 ERR("Failed to set the close timestamp of the current trace chunk of session \"%s\"",
747 session->name);
748 ret = -1;
749 goto end;
750 }
751
752 if (session->ust_session) {
0a184d4e
JG
753 const uint64_t relayd_id =
754 session->ust_session->consumer->net_seq_index;
755
d2956687
JG
756 cds_lfht_for_each_entry(
757 session->ust_session->consumer->socks->ht,
758 &iter, socket, node.node) {
759 pthread_mutex_lock(socket->lock);
760 ret = consumer_close_trace_chunk(socket,
0a184d4e 761 relayd_id,
d2956687 762 session->id,
ecd1a12f 763 trace_chunk, closed_trace_chunk_path);
d2956687
JG
764 pthread_mutex_unlock(socket->lock);
765 if (ret) {
766 ERR("Failed to close trace chunk on user space consumer");
767 error_occurred = true;
768 }
769 }
770 }
771 if (session->kernel_session) {
0a184d4e
JG
772 const uint64_t relayd_id =
773 session->kernel_session->consumer->net_seq_index;
774
d2956687
JG
775 cds_lfht_for_each_entry(
776 session->kernel_session->consumer->socks->ht,
777 &iter, socket, node.node) {
778 pthread_mutex_lock(socket->lock);
779 ret = consumer_close_trace_chunk(socket,
0a184d4e 780 relayd_id,
d2956687 781 session->id,
ecd1a12f 782 trace_chunk, closed_trace_chunk_path);
d2956687
JG
783 pthread_mutex_unlock(socket->lock);
784 if (ret) {
785 ERR("Failed to close trace chunk on kernel consumer");
786 error_occurred = true;
787 }
788 }
789 }
790 ret = error_occurred ? -1 : 0;
82b69413 791end:
d2956687 792 return ret;
82b69413
JG
793}
794
04ed9e10
JG
795/*
796 * This function skips the metadata channel as the begin/end timestamps of a
797 * metadata packet are useless.
798 *
799 * Moreover, opening a packet after a "clear" will cause problems for live
800 * sessions as it will introduce padding that was not part of the first trace
801 * chunk. The relay daemon expects the content of the metadata stream of
802 * successive metadata trace chunks to be strict supersets of one another.
803 *
804 * For example, flushing a packet at the beginning of the metadata stream of
805 * a trace chunk resulting from a "clear" session command will cause the
806 * size of the metadata stream of the new trace chunk to not match the size of
807 * the metadata stream of the original chunk. This will confuse the relay
808 * daemon as the same "offset" in a metadata stream will no longer point
809 * to the same content.
810 */
811static
812enum lttng_error_code session_kernel_open_packets(struct ltt_session *session)
813{
814 enum lttng_error_code ret = LTTNG_OK;
815 struct consumer_socket *socket;
816 struct lttng_ht_iter iter;
817 struct cds_lfht_node *node;
818 struct ltt_kernel_channel *chan;
819
820 rcu_read_lock();
821
822 cds_lfht_first(session->kernel_session->consumer->socks->ht, &iter.iter);
823 node = cds_lfht_iter_get_node(&iter.iter);
824 socket = container_of(node, typeof(*socket), node.node);
825
826 cds_list_for_each_entry(chan,
827 &session->kernel_session->channel_list.head, list) {
828 int open_ret;
829
830 DBG("Open packet of kernel channel: channel key = %" PRIu64
831 ", session name = %s, session_id = %" PRIu64,
832 chan->key, session->name, session->id);
833
834 open_ret = consumer_open_channel_packets(socket, chan->key);
835 if (open_ret < 0) {
836 /* General error (no known error expected). */
837 ret = LTTNG_ERR_UNK;
838 goto end;
839 }
840 }
841
842end:
843 rcu_read_unlock();
844 return ret;
845}
846
847enum lttng_error_code session_open_packets(struct ltt_session *session)
848{
849 enum lttng_error_code ret = LTTNG_OK;
850
851 DBG("Opening packets of session channels: session name = %s, session id = %" PRIu64,
852 session->name, session->id);
853
854 if (session->ust_session) {
855 ret = ust_app_open_packets(session);
856 if (ret != LTTNG_OK) {
857 goto end;
858 }
859 }
860
861 if (session->kernel_session) {
862 ret = session_kernel_open_packets(session);
863 if (ret != LTTNG_OK) {
864 goto end;
865 }
866 }
867
868end:
869 return ret;
870}
871
82b69413
JG
872/*
873 * Set a session's current trace chunk.
874 *
875 * Must be called with the session lock held.
876 */
877int session_set_trace_chunk(struct ltt_session *session,
d2956687
JG
878 struct lttng_trace_chunk *new_trace_chunk,
879 struct lttng_trace_chunk **current_trace_chunk)
82b69413
JG
880{
881 ASSERT_LOCKED(session->lock);
d2956687
JG
882 return _session_set_trace_chunk_no_lock_check(session, new_trace_chunk,
883 current_trace_chunk);
82b69413
JG
884}
885
3e3665b8
JG
886static
887void session_notify_destruction(const struct ltt_session *session)
888{
889 size_t i;
890 const size_t count = lttng_dynamic_array_get_count(
891 &session->destroy_notifiers);
892
893 for (i = 0; i < count; i++) {
894 const struct ltt_session_destroy_notifier_element *element =
895 lttng_dynamic_array_get_element(
896 &session->destroy_notifiers, i);
897
898 element->notifier(session, element->user_data);
899 }
900}
901
ccbdaca4
MD
902/*
903 * Fire each clear notifier once, and remove them from the array.
904 */
905void session_notify_clear(struct ltt_session *session)
906{
907 size_t i;
908 const size_t count = lttng_dynamic_array_get_count(
909 &session->clear_notifiers);
910
911 for (i = 0; i < count; i++) {
912 const struct ltt_session_clear_notifier_element *element =
913 lttng_dynamic_array_get_element(
914 &session->clear_notifiers, i);
915
916 element->notifier(session, element->user_data);
917 }
918 lttng_dynamic_array_clear(&session->clear_notifiers);
919}
920
e32d7f27
JG
921static
922void session_release(struct urcu_ref *ref)
923{
924 int ret;
925 struct ltt_ust_session *usess;
926 struct ltt_kernel_session *ksess;
927 struct ltt_session *session = container_of(ref, typeof(*session), ref);
7fdbed1c 928 const bool session_published = session->published;
e32d7f27 929
d2956687
JG
930 assert(!session->chunk_being_archived);
931
e32d7f27
JG
932 usess = session->ust_session;
933 ksess = session->kernel_session;
3e3665b8 934
f8a37411 935 /* Clean kernel session teardown, keeping data for destroy notifier. */
e32d7f27
JG
936 kernel_destroy_session(ksess);
937
d070c424 938 /* UST session teardown, keeping data for destroy notifier. */
e32d7f27
JG
939 if (usess) {
940 /* Close any relayd session */
941 consumer_output_send_destroy_relayd(usess->consumer);
942
943 /* Destroy every UST application related to this session. */
944 ret = ust_app_destroy_trace_all(usess);
945 if (ret) {
946 ERR("Error in ust_app_destroy_trace_all");
947 }
948
d070c424 949 /* Clean up the rest, keeping destroy notifier data. */
e32d7f27
JG
950 trace_ust_destroy_session(usess);
951 }
952
953 /*
954 * Must notify the kernel thread here to update it's poll set in order to
955 * remove the channel(s)' fd just destroyed.
956 */
957 ret = notify_thread_pipe(kernel_poll_pipe[1]);
958 if (ret < 0) {
959 PERROR("write kernel poll pipe");
960 }
961
962 DBG("Destroying session %s (id %" PRIu64 ")", session->name, session->id);
e32d7f27 963
e32d7f27 964 snapshot_destroy(&session->snapshot);
99d688f2 965
82b69413
JG
966 pthread_mutex_destroy(&session->lock);
967
7fdbed1c 968 if (session_published) {
f4cc5e83
JG
969 ASSERT_LOCKED(ltt_session_list.lock);
970 del_session_list(session);
971 del_session_ht(session);
f4cc5e83 972 }
7fdbed1c 973 session_notify_destruction(session);
d070c424 974
1ac9cb73 975 consumer_output_put(session->consumer);
d070c424
MD
976 kernel_free_session(ksess);
977 session->kernel_session = NULL;
978 if (usess) {
979 trace_ust_free_session(usess);
980 session->ust_session = NULL;
981 }
7fdbed1c 982 lttng_dynamic_array_reset(&session->destroy_notifiers);
ccbdaca4 983 lttng_dynamic_array_reset(&session->clear_notifiers);
d2956687 984 free(session->last_archived_chunk_name);
6fa5fe7c 985 free(session->base_path);
e32d7f27 986 free(session);
7fdbed1c
JG
987 if (session_published) {
988 /*
989 * Broadcast after free-ing to ensure the memory is
990 * reclaimed before the main thread exits.
991 */
8db3acaf 992 ASSERT_LOCKED(ltt_session_list.lock);
7fdbed1c
JG
993 pthread_cond_broadcast(&ltt_session_list.removal_cond);
994 }
e32d7f27
JG
995}
996
997/*
998 * Acquire a reference to a session.
999 * This function may fail (return false); its return value must be checked.
1000 */
1001bool session_get(struct ltt_session *session)
1002{
1003 return urcu_ref_get_unless_zero(&session->ref);
1004}
1005
1006/*
1007 * Release a reference to a session.
1008 */
1009void session_put(struct ltt_session *session)
1010{
b178f53e
JG
1011 if (!session) {
1012 return;
1013 }
e32d7f27
JG
1014 /*
1015 * The session list lock must be held as any session_put()
1016 * may cause the removal of the session from the session_list.
1017 */
1018 ASSERT_LOCKED(ltt_session_list.lock);
1019 assert(session->ref.refcount);
1020 urcu_ref_put(&session->ref, session_release);
1021}
1022
1023/*
1024 * Destroy a session.
1025 *
1026 * This method does not immediately release/free the session as other
1027 * components may still hold a reference to the session. However,
1028 * the session should no longer be presented to the user.
1029 *
1030 * Releases the session list's reference to the session
1031 * and marks it as destroyed. Iterations on the session list should be
1032 * mindful of the "destroyed" flag.
1033 */
1034void session_destroy(struct ltt_session *session)
1035{
1036 assert(!session->destroyed);
1037 session->destroyed = true;
1038 session_put(session);
1039}
1040
3e3665b8
JG
1041int session_add_destroy_notifier(struct ltt_session *session,
1042 ltt_session_destroy_notifier notifier, void *user_data)
1043{
1044 const struct ltt_session_destroy_notifier_element element = {
1045 .notifier = notifier,
1046 .user_data = user_data
1047 };
1048
1049 return lttng_dynamic_array_add_element(&session->destroy_notifiers,
1050 &element);
1051}
1052
ccbdaca4
MD
1053int session_add_clear_notifier(struct ltt_session *session,
1054 ltt_session_clear_notifier notifier, void *user_data)
1055{
1056 const struct ltt_session_clear_notifier_element element = {
1057 .notifier = notifier,
1058 .user_data = user_data
1059 };
1060
1061 return lttng_dynamic_array_add_element(&session->clear_notifiers,
1062 &element);
1063}
1064
5b74c7b1 1065/*
74babd95 1066 * Return a ltt_session structure ptr that matches name. If no session found,
23324029 1067 * NULL is returned. This must be called with the session list lock held using
74babd95 1068 * session_lock_list and session_unlock_list.
e32d7f27 1069 * A reference to the session is implicitly acquired by this function.
5b74c7b1 1070 */
58a1a227 1071struct ltt_session *session_find_by_name(const char *name)
5b74c7b1 1072{
5b74c7b1
DG
1073 struct ltt_session *iter;
1074
0525e9ae 1075 assert(name);
e32d7f27 1076 ASSERT_LOCKED(ltt_session_list.lock);
0525e9ae 1077
5f822d0a
DG
1078 DBG2("Trying to find session by name %s", name);
1079
5b74c7b1 1080 cds_list_for_each_entry(iter, &ltt_session_list.head, list) {
e32d7f27
JG
1081 if (!strncmp(iter->name, name, NAME_MAX) &&
1082 !iter->destroyed) {
74babd95 1083 goto found;
5b74c7b1
DG
1084 }
1085 }
1086
e32d7f27 1087 return NULL;
74babd95 1088found:
e32d7f27 1089 return session_get(iter) ? iter : NULL;
5b74c7b1
DG
1090}
1091
23324029
JD
1092/*
1093 * Return an ltt_session that matches the id. If no session is found,
1094 * NULL is returned. This must be called with rcu_read_lock and
1095 * session list lock held (to guarantee the lifetime of the session).
1096 */
1097struct ltt_session *session_find_by_id(uint64_t id)
1098{
1099 struct lttng_ht_node_u64 *node;
1100 struct lttng_ht_iter iter;
1101 struct ltt_session *ls;
1102
e32d7f27
JG
1103 ASSERT_LOCKED(ltt_session_list.lock);
1104
d68ec974
JG
1105 if (!ltt_sessions_ht_by_id) {
1106 goto end;
1107 }
1108
23324029
JD
1109 lttng_ht_lookup(ltt_sessions_ht_by_id, &id, &iter);
1110 node = lttng_ht_iter_get_node_u64(&iter);
1111 if (node == NULL) {
d68ec974 1112 goto end;
23324029
JD
1113 }
1114 ls = caa_container_of(node, struct ltt_session, node);
1115
1116 DBG3("Session %" PRIu64 " found by id.", id);
e32d7f27 1117 return session_get(ls) ? ls : NULL;
23324029 1118
d68ec974 1119end:
23324029
JD
1120 DBG3("Session %" PRIu64 " NOT found by id", id);
1121 return NULL;
1122}
1123
5b74c7b1 1124/*
b178f53e
JG
1125 * Create a new session and add it to the session list.
1126 * Session list lock must be held by the caller.
5b74c7b1 1127 */
b178f53e 1128enum lttng_error_code session_create(const char *name, uid_t uid, gid_t gid,
e3876bf0 1129 struct ltt_session **out_session)
5b74c7b1 1130{
f3ed775e 1131 int ret;
b178f53e
JG
1132 enum lttng_error_code ret_code;
1133 struct ltt_session *new_session = NULL;
e07ae692 1134
b178f53e
JG
1135 ASSERT_LOCKED(ltt_session_list.lock);
1136 if (name) {
1137 struct ltt_session *clashing_session;
1138
1139 clashing_session = session_find_by_name(name);
1140 if (clashing_session) {
1141 session_put(clashing_session);
1142 ret_code = LTTNG_ERR_EXIST_SESS;
1143 goto error;
1144 }
1145 }
ba7f0ae5 1146 new_session = zmalloc(sizeof(struct ltt_session));
b178f53e
JG
1147 if (!new_session) {
1148 PERROR("Failed to allocate an ltt_session structure");
1149 ret_code = LTTNG_ERR_NOMEM;
1150 goto error;
5b74c7b1
DG
1151 }
1152
3e3665b8 1153 lttng_dynamic_array_init(&new_session->destroy_notifiers,
93bed9fe
JG
1154 sizeof(struct ltt_session_destroy_notifier_element),
1155 NULL);
ccbdaca4
MD
1156 lttng_dynamic_array_init(&new_session->clear_notifiers,
1157 sizeof(struct ltt_session_clear_notifier_element),
1158 NULL);
e32d7f27 1159 urcu_ref_init(&new_session->ref);
b178f53e 1160 pthread_mutex_init(&new_session->lock, NULL);
e32d7f27 1161
b178f53e
JG
1162 new_session->creation_time = time(NULL);
1163 if (new_session->creation_time == (time_t) -1) {
1164 PERROR("Failed to sample session creation time");
1165 ret_code = LTTNG_ERR_SESSION_FAIL;
f3ed775e
DG
1166 goto error;
1167 }
1168
b178f53e
JG
1169 /* Create default consumer output. */
1170 new_session->consumer = consumer_create_output(CONSUMER_DST_LOCAL);
1171 if (new_session->consumer == NULL) {
1172 ret_code = LTTNG_ERR_NOMEM;
1c1c3634
DG
1173 goto error;
1174 }
1175
b178f53e
JG
1176 if (name) {
1177 ret = lttng_strncpy(new_session->name, name, sizeof(new_session->name));
1178 if (ret) {
1179 ret_code = LTTNG_ERR_SESSION_INVALID_CHAR;
1180 goto error;
1181 }
1182 ret = validate_name(name);
1183 if (ret < 0) {
1184 ret_code = LTTNG_ERR_SESSION_INVALID_CHAR;
1185 goto error;
1186 }
1187 } else {
1188 int i = 0;
1189 bool found_name = false;
1190 char datetime[16];
1191 struct tm *timeinfo;
1192
1193 timeinfo = localtime(&new_session->creation_time);
1194 if (!timeinfo) {
1195 ret_code = LTTNG_ERR_SESSION_FAIL;
1196 goto error;
1197 }
1198 strftime(datetime, sizeof(datetime), "%Y%m%d-%H%M%S", timeinfo);
1199 for (i = 0; i < INT_MAX; i++) {
1200 struct ltt_session *clashing_session;
1201
1202 if (i == 0) {
1203 ret = snprintf(new_session->name,
1204 sizeof(new_session->name),
1205 "%s-%s",
1206 DEFAULT_SESSION_NAME,
1207 datetime);
1208 } else {
1209 ret = snprintf(new_session->name,
1210 sizeof(new_session->name),
1211 "%s%d-%s",
1212 DEFAULT_SESSION_NAME, i,
1213 datetime);
1214 }
46ef2188 1215 new_session->name_contains_creation_time = true;
b178f53e
JG
1216 if (ret == -1 || ret >= sizeof(new_session->name)) {
1217 /*
1218 * Null-terminate in case the name is used
1219 * in logging statements.
1220 */
1221 new_session->name[sizeof(new_session->name) - 1] = '\0';
1222 ret_code = LTTNG_ERR_SESSION_FAIL;
1223 goto error;
1224 }
1225
1226 clashing_session =
1227 session_find_by_name(new_session->name);
1228 session_put(clashing_session);
1229 if (!clashing_session) {
1230 found_name = true;
1231 break;
1232 }
1233 }
1234 if (found_name) {
1235 DBG("Generated session name \"%s\"", new_session->name);
1236 new_session->has_auto_generated_name = true;
1237 } else {
1238 ERR("Failed to auto-generate a session name");
1239 ret_code = LTTNG_ERR_SESSION_FAIL;
1240 goto error;
1241 }
1242 }
1243
d3e2ba59 1244 ret = gethostname(new_session->hostname, sizeof(new_session->hostname));
73184835
DG
1245 if (ret < 0) {
1246 if (errno == ENAMETOOLONG) {
1247 new_session->hostname[sizeof(new_session->hostname) - 1] = '\0';
b178f53e
JG
1248 ERR("Hostname exceeds the maximal permitted length and has been truncated to %s",
1249 new_session->hostname);
73184835 1250 } else {
b178f53e 1251 ret_code = LTTNG_ERR_SESSION_FAIL;
73184835
DG
1252 goto error;
1253 }
d3e2ba59
JD
1254 }
1255
6df2e2c9
MD
1256 new_session->uid = uid;
1257 new_session->gid = gid;
1258
6dc3064a
DG
1259 ret = snapshot_init(&new_session->snapshot);
1260 if (ret < 0) {
b178f53e 1261 ret_code = LTTNG_ERR_NOMEM;
6dc3064a
DG
1262 goto error;
1263 }
1264
4f23c583 1265 new_session->rotation_state = LTTNG_ROTATION_STATE_NO_ROTATION;
92816cc3 1266
b178f53e 1267 /* Add new session to the session list. */
a991f516 1268 new_session->id = add_session_list(new_session);
b178f53e 1269
23324029
JD
1270 /*
1271 * Add the new session to the ltt_sessions_ht_by_id.
1272 * No ownership is taken by the hash table; it is merely
1273 * a wrapper around the session list used for faster access
1274 * by session id.
1275 */
1276 add_session_ht(new_session);
f4cc5e83 1277 new_session->published = true;
b5541356 1278
a4b92340 1279 /*
b178f53e
JG
1280 * Consumer is left to NULL since the create_session_uri command will
1281 * set it up and, if valid, assign it to the session.
a4b92340 1282 */
b178f53e
JG
1283 DBG("Tracing session %s created with ID %" PRIu64 " by uid = %d, gid = %d",
1284 new_session->name, new_session->id, new_session->uid,
1285 new_session->gid);
1286 ret_code = LTTNG_OK;
1287end:
1288 if (new_session) {
1289 (void) session_get(new_session);
1290 *out_session = new_session;
1291 }
1292 return ret_code;
5b74c7b1 1293error:
f4cc5e83 1294 session_put(new_session);
b178f53e
JG
1295 new_session = NULL;
1296 goto end;
5b74c7b1 1297}
2f77fc4b
DG
1298
1299/*
d7b377ed 1300 * Check if the UID matches the session. Root user has access to all
2f77fc4b
DG
1301 * sessions.
1302 */
d7b377ed 1303bool session_access_ok(struct ltt_session *session, uid_t uid)
2f77fc4b
DG
1304{
1305 assert(session);
d7b377ed 1306 return (uid == session->uid) || uid == 0;
2f77fc4b 1307}
2961f09e
JG
1308
1309/*
1310 * Set a session's rotation state and reset all associated state.
1311 *
1312 * This function resets the rotation state (check timers, pending
1313 * flags, etc.) and sets the result of the last rotation. The result
1314 * can be queries by a liblttng-ctl client.
1315 *
1316 * Be careful of the result passed to this function. For instance,
1317 * on failure to launch a rotation, a client will expect the rotation
83ed9e90 1318 * state to be set to "NO_ROTATION". If an error occurred while the
2961f09e
JG
1319 * rotation was "ONGOING", result should be set to "ERROR", which will
1320 * allow a client to report it.
1321 *
1322 * Must be called with the session and session_list locks held.
1323 */
1324int session_reset_rotation_state(struct ltt_session *session,
1325 enum lttng_rotation_state result)
1326{
1327 int ret = 0;
1328
1329 ASSERT_LOCKED(ltt_session_list.lock);
1330 ASSERT_LOCKED(session->lock);
1331
2961f09e
JG
1332 session->rotation_state = result;
1333 if (session->rotation_pending_check_timer_enabled) {
1334 ret = timer_session_rotation_pending_check_stop(session);
1335 }
d2956687
JG
1336 if (session->chunk_being_archived) {
1337 uint64_t chunk_id;
1338 enum lttng_trace_chunk_status chunk_status;
1339
1340 chunk_status = lttng_trace_chunk_get_id(
1341 session->chunk_being_archived,
1342 &chunk_id);
1343 assert(chunk_status == LTTNG_TRACE_CHUNK_STATUS_OK);
1344 LTTNG_OPTIONAL_SET(&session->last_archived_chunk_id,
1345 chunk_id);
1346 lttng_trace_chunk_put(session->chunk_being_archived);
1347 session->chunk_being_archived = NULL;
ccbdaca4
MD
1348 /*
1349 * Fire the clear reply notifiers if we are completing a clear
1350 * rotation.
1351 */
1352 session_notify_clear(session);
d2956687 1353 }
2961f09e
JG
1354 return ret;
1355}
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