Commit | Line | Data |
---|---|---|
5b74c7b1 | 1 | /* |
21cf9b6b | 2 | * Copyright (C) 2011 EfficiOS Inc. |
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 | |
c9e313bc SM |
20 | #include <common/common.hpp> |
21 | #include <common/utils.hpp> | |
22 | #include <common/trace-chunk.hpp> | |
23 | #include <common/sessiond-comm/sessiond-comm.hpp> | |
24 | #include <lttng/location-internal.hpp> | |
25 | #include "lttng-sessiond.hpp" | |
26 | #include "kernel.hpp" | |
1e307fab | 27 | |
c9e313bc SM |
28 | #include "session.hpp" |
29 | #include "utils.hpp" | |
30 | #include "trace-ust.hpp" | |
31 | #include "timer.hpp" | |
32 | #include "cmd.hpp" | |
5b74c7b1 | 33 | |
f1494934 | 34 | namespace { |
3e3665b8 JG |
35 | struct ltt_session_destroy_notifier_element { |
36 | ltt_session_destroy_notifier notifier; | |
37 | void *user_data; | |
38 | }; | |
39 | ||
ccbdaca4 MD |
40 | struct ltt_session_clear_notifier_element { |
41 | ltt_session_clear_notifier notifier; | |
42 | void *user_data; | |
43 | }; | |
44 | ||
8c0faa1d | 45 | /* |
b5541356 | 46 | * NOTES: |
8c0faa1d | 47 | * |
b5541356 | 48 | * No ltt_session.lock is taken here because those data structure are widely |
e1bbf989 | 49 | * spread across the lttng-tools code base so before calling functions below |
b5541356 | 50 | * that can read/write a session, the caller MUST acquire the session lock |
54d01ffb | 51 | * using session_lock() and session_unlock(). |
8c0faa1d | 52 | */ |
8c0faa1d | 53 | |
f1494934 JG |
54 | /* These characters are forbidden in a session name. Used by validate_name. */ |
55 | const char *forbidden_name_chars = "/"; | |
56 | ||
57 | /* Global hash table to keep the sessions, indexed by id. */ | |
58 | struct lttng_ht *ltt_sessions_ht_by_id = NULL; | |
59 | /* Global hash table to keep the sessions, indexed by name. */ | |
60 | struct lttng_ht *ltt_sessions_ht_by_name = NULL; | |
61 | ||
5b74c7b1 | 62 | /* |
b5541356 | 63 | * Init tracing session list. |
5b74c7b1 | 64 | * |
b5541356 | 65 | * Please see session.h for more explanation and correct usage of the list. |
5b74c7b1 | 66 | */ |
f1494934 | 67 | struct ltt_session_list the_session_list = { |
b5541356 | 68 | .lock = PTHREAD_MUTEX_INITIALIZER, |
99d688f2 | 69 | .removal_cond = PTHREAD_COND_INITIALIZER, |
a24f7994 | 70 | .next_uuid = 0, |
f1494934 | 71 | .head = CDS_LIST_HEAD_INIT(the_session_list.head), |
b5541356 | 72 | }; |
f1494934 | 73 | } /* namespace */ |
23324029 | 74 | |
1c1c3634 DG |
75 | /* |
76 | * Validate the session name for forbidden characters. | |
77 | * | |
78 | * Return 0 on success else -1 meaning a forbidden char. has been found. | |
79 | */ | |
80 | static int validate_name(const char *name) | |
81 | { | |
82 | int ret; | |
83 | char *tok, *tmp_name; | |
84 | ||
a0377dfe | 85 | LTTNG_ASSERT(name); |
1c1c3634 DG |
86 | |
87 | tmp_name = strdup(name); | |
88 | if (!tmp_name) { | |
89 | /* ENOMEM here. */ | |
90 | ret = -1; | |
91 | goto error; | |
92 | } | |
93 | ||
94 | tok = strpbrk(tmp_name, forbidden_name_chars); | |
95 | if (tok) { | |
96 | DBG("Session name %s contains a forbidden character", name); | |
97 | /* Forbidden character has been found. */ | |
98 | ret = -1; | |
99 | goto error; | |
100 | } | |
101 | ret = 0; | |
102 | ||
103 | error: | |
104 | free(tmp_name); | |
105 | return ret; | |
106 | } | |
107 | ||
5b74c7b1 | 108 | /* |
050349bb | 109 | * Add a ltt_session structure to the global list. |
5b74c7b1 | 110 | * |
050349bb | 111 | * The caller MUST acquire the session list lock before. |
44e96653 | 112 | * Returns the unique identifier for the session. |
5b74c7b1 | 113 | */ |
d022620a | 114 | static uint64_t add_session_list(struct ltt_session *ls) |
5b74c7b1 | 115 | { |
a0377dfe | 116 | LTTNG_ASSERT(ls); |
0525e9ae | 117 | |
f1494934 JG |
118 | cds_list_add(&ls->list, &the_session_list.head); |
119 | return the_session_list.next_uuid++; | |
5b74c7b1 DG |
120 | } |
121 | ||
122 | /* | |
050349bb | 123 | * Delete a ltt_session structure to the global list. |
b5541356 | 124 | * |
050349bb | 125 | * The caller MUST acquire the session list lock before. |
5b74c7b1 DG |
126 | */ |
127 | static void del_session_list(struct ltt_session *ls) | |
128 | { | |
a0377dfe | 129 | LTTNG_ASSERT(ls); |
0525e9ae | 130 | |
5b74c7b1 | 131 | cds_list_del(&ls->list); |
5b74c7b1 DG |
132 | } |
133 | ||
b5541356 | 134 | /* |
050349bb | 135 | * Return a pointer to the session list. |
b5541356 | 136 | */ |
54d01ffb | 137 | struct ltt_session_list *session_get_list(void) |
b5541356 | 138 | { |
f1494934 | 139 | return &the_session_list; |
b5541356 DG |
140 | } |
141 | ||
99d688f2 JG |
142 | /* |
143 | * Returns once the session list is empty. | |
144 | */ | |
145 | void session_list_wait_empty(void) | |
146 | { | |
f1494934 JG |
147 | pthread_mutex_lock(&the_session_list.lock); |
148 | while (!cds_list_empty(&the_session_list.head)) { | |
149 | pthread_cond_wait(&the_session_list.removal_cond, | |
150 | &the_session_list.lock); | |
99d688f2 | 151 | } |
f1494934 | 152 | pthread_mutex_unlock(&the_session_list.lock); |
99d688f2 JG |
153 | } |
154 | ||
b5541356 | 155 | /* |
6c9cc2ab | 156 | * Acquire session list lock |
b5541356 | 157 | */ |
54d01ffb | 158 | void session_lock_list(void) |
b5541356 | 159 | { |
f1494934 | 160 | pthread_mutex_lock(&the_session_list.lock); |
b5541356 DG |
161 | } |
162 | ||
71e0a100 JG |
163 | /* |
164 | * Try to acquire session list lock | |
165 | */ | |
166 | int session_trylock_list(void) | |
167 | { | |
f1494934 | 168 | return pthread_mutex_trylock(&the_session_list.lock); |
71e0a100 JG |
169 | } |
170 | ||
b5541356 | 171 | /* |
6c9cc2ab | 172 | * Release session list lock |
b5541356 | 173 | */ |
54d01ffb | 174 | void session_unlock_list(void) |
b5541356 | 175 | { |
f1494934 | 176 | pthread_mutex_unlock(&the_session_list.lock); |
b5541356 DG |
177 | } |
178 | ||
dd73d57b JG |
179 | /* |
180 | * Get the session's consumer destination type. | |
181 | * | |
182 | * The caller must hold the session lock. | |
183 | */ | |
184 | enum consumer_dst_type session_get_consumer_destination_type( | |
185 | const struct ltt_session *session) | |
186 | { | |
187 | /* | |
188 | * The output information is duplicated in both of those session types. | |
189 | * Hence, it doesn't matter from which it is retrieved. However, it is | |
190 | * possible for only one of them to be set. | |
191 | */ | |
192 | return session->kernel_session ? | |
193 | session->kernel_session->consumer->type : | |
194 | session->ust_session->consumer->type; | |
195 | } | |
196 | ||
197 | /* | |
198 | * Get the session's consumer network hostname. | |
199 | * The caller must ensure that the destination is of type "net". | |
200 | * | |
201 | * The caller must hold the session lock. | |
202 | */ | |
203 | const char *session_get_net_consumer_hostname(const struct ltt_session *session) | |
204 | { | |
205 | const char *hostname = NULL; | |
206 | const struct consumer_output *output; | |
207 | ||
208 | output = session->kernel_session ? | |
209 | session->kernel_session->consumer : | |
210 | session->ust_session->consumer; | |
211 | ||
212 | /* | |
213 | * hostname is assumed to be the same for both control and data | |
214 | * connections. | |
215 | */ | |
216 | switch (output->dst.net.control.dtype) { | |
217 | case LTTNG_DST_IPV4: | |
218 | hostname = output->dst.net.control.dst.ipv4; | |
219 | break; | |
220 | case LTTNG_DST_IPV6: | |
221 | hostname = output->dst.net.control.dst.ipv6; | |
222 | break; | |
223 | default: | |
224 | abort(); | |
225 | } | |
226 | return hostname; | |
227 | } | |
228 | ||
229 | /* | |
230 | * Get the session's consumer network control and data ports. | |
231 | * The caller must ensure that the destination is of type "net". | |
232 | * | |
233 | * The caller must hold the session lock. | |
234 | */ | |
235 | void session_get_net_consumer_ports(const struct ltt_session *session, | |
236 | uint16_t *control_port, uint16_t *data_port) | |
237 | { | |
238 | const struct consumer_output *output; | |
239 | ||
240 | output = session->kernel_session ? | |
241 | session->kernel_session->consumer : | |
242 | session->ust_session->consumer; | |
243 | *control_port = output->dst.net.control.port; | |
244 | *data_port = output->dst.net.data.port; | |
245 | } | |
246 | ||
5d65beab JG |
247 | /* |
248 | * Get the location of the latest trace archive produced by a rotation. | |
249 | * | |
250 | * The caller must hold the session lock. | |
251 | */ | |
252 | struct lttng_trace_archive_location *session_get_trace_archive_location( | |
3e3665b8 | 253 | const struct ltt_session *session) |
5d65beab | 254 | { |
d2956687 | 255 | int ret; |
5d65beab | 256 | struct lttng_trace_archive_location *location = NULL; |
d2956687 JG |
257 | char *chunk_path = NULL; |
258 | ||
259 | if (session->rotation_state != LTTNG_ROTATION_STATE_COMPLETED || | |
260 | !session->last_archived_chunk_name) { | |
261 | goto end; | |
262 | } | |
5d65beab | 263 | |
5d65beab JG |
264 | switch (session_get_consumer_destination_type(session)) { |
265 | case CONSUMER_DST_LOCAL: | |
ecd1a12f MD |
266 | ret = asprintf(&chunk_path, |
267 | "%s/" DEFAULT_ARCHIVED_TRACE_CHUNKS_DIRECTORY "/%s", | |
268 | session_get_base_path(session), | |
269 | session->last_archived_chunk_name); | |
270 | if (ret == -1) { | |
271 | goto end; | |
272 | } | |
5d65beab | 273 | location = lttng_trace_archive_location_local_create( |
d2956687 | 274 | chunk_path); |
5d65beab JG |
275 | break; |
276 | case CONSUMER_DST_NET: | |
277 | { | |
278 | const char *hostname; | |
279 | uint16_t control_port, data_port; | |
280 | ||
281 | hostname = session_get_net_consumer_hostname(session); | |
282 | session_get_net_consumer_ports(session, | |
283 | &control_port, | |
284 | &data_port); | |
285 | location = lttng_trace_archive_location_relay_create( | |
286 | hostname, | |
287 | LTTNG_TRACE_ARCHIVE_LOCATION_RELAY_PROTOCOL_TYPE_TCP, | |
ecd1a12f | 288 | control_port, data_port, session->last_chunk_path); |
5d65beab JG |
289 | break; |
290 | } | |
291 | default: | |
292 | abort(); | |
293 | } | |
294 | end: | |
d2956687 | 295 | free(chunk_path); |
5d65beab JG |
296 | return location; |
297 | } | |
298 | ||
23324029 | 299 | /* |
e1bbf989 | 300 | * Allocate the ltt_sessions_ht_by_id and ltt_sessions_ht_by_name HT. |
9c6518bc JG |
301 | * |
302 | * The session list lock must be held. | |
23324029 | 303 | */ |
f848281f | 304 | static int ltt_sessions_ht_alloc(void) |
23324029 JD |
305 | { |
306 | int ret = 0; | |
307 | ||
308 | DBG("Allocating ltt_sessions_ht_by_id"); | |
309 | ltt_sessions_ht_by_id = lttng_ht_new(0, LTTNG_HT_TYPE_U64); | |
310 | if (!ltt_sessions_ht_by_id) { | |
311 | ret = -1; | |
312 | ERR("Failed to allocate ltt_sessions_ht_by_id"); | |
313 | goto end; | |
314 | } | |
e1bbf989 JR |
315 | |
316 | DBG("Allocating ltt_sessions_ht_by_name"); | |
317 | ltt_sessions_ht_by_name = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); | |
318 | if (!ltt_sessions_ht_by_name) { | |
319 | ret = -1; | |
320 | ERR("Failed to allocate ltt_sessions_ht_by_name"); | |
321 | goto end; | |
322 | } | |
323 | ||
23324029 JD |
324 | end: |
325 | return ret; | |
326 | } | |
327 | ||
328 | /* | |
329 | * Destroy the ltt_sessions_ht_by_id HT. | |
9c6518bc JG |
330 | * |
331 | * The session list lock must be held. | |
23324029 | 332 | */ |
accdc9bf | 333 | static void ltt_sessions_ht_destroy(void) |
23324029 | 334 | { |
e1bbf989 | 335 | if (ltt_sessions_ht_by_id) { |
3c339053 | 336 | lttng_ht_destroy(ltt_sessions_ht_by_id); |
e1bbf989 JR |
337 | ltt_sessions_ht_by_id = NULL; |
338 | } | |
339 | ||
340 | if (ltt_sessions_ht_by_name) { | |
3c339053 | 341 | lttng_ht_destroy(ltt_sessions_ht_by_name); |
e1bbf989 | 342 | ltt_sessions_ht_by_name = NULL; |
23324029 | 343 | } |
e1bbf989 JR |
344 | |
345 | return; | |
23324029 JD |
346 | } |
347 | ||
348 | /* | |
e1bbf989 JR |
349 | * Add a ltt_session to the ltt_sessions_ht_by_id and ltt_sessions_ht_by_name. |
350 | * If unallocated, the ltt_sessions_ht_by_id and ltt_sessions_ht_by_name. HTs | |
351 | * are allocated. The session list lock must be held. | |
23324029 JD |
352 | */ |
353 | static void add_session_ht(struct ltt_session *ls) | |
354 | { | |
355 | int ret; | |
356 | ||
a0377dfe | 357 | LTTNG_ASSERT(ls); |
23324029 JD |
358 | |
359 | if (!ltt_sessions_ht_by_id) { | |
360 | ret = ltt_sessions_ht_alloc(); | |
361 | if (ret) { | |
362 | ERR("Error allocating the sessions HT"); | |
363 | goto end; | |
364 | } | |
365 | } | |
e1bbf989 JR |
366 | |
367 | /* Should always be present with ltt_sessions_ht_by_id. */ | |
a0377dfe | 368 | LTTNG_ASSERT(ltt_sessions_ht_by_name); |
e1bbf989 | 369 | |
23324029 JD |
370 | lttng_ht_node_init_u64(&ls->node, ls->id); |
371 | lttng_ht_add_unique_u64(ltt_sessions_ht_by_id, &ls->node); | |
372 | ||
e1bbf989 JR |
373 | lttng_ht_node_init_str(&ls->node_by_name, ls->name); |
374 | lttng_ht_add_unique_str(ltt_sessions_ht_by_name, &ls->node_by_name); | |
375 | ||
23324029 JD |
376 | end: |
377 | return; | |
378 | } | |
379 | ||
380 | /* | |
e1bbf989 | 381 | * Test if ltt_sessions_ht_by_id/name are empty. |
2a6ebf6b | 382 | * Return `false` if hash table objects are null. |
23324029 JD |
383 | * The session list lock must be held. |
384 | */ | |
2a6ebf6b | 385 | static bool ltt_sessions_ht_empty(void) |
23324029 | 386 | { |
2a6ebf6b | 387 | bool empty = false; |
23324029 JD |
388 | |
389 | if (!ltt_sessions_ht_by_id) { | |
2a6ebf6b | 390 | /* The hash tables do not exist yet. */ |
23324029 JD |
391 | goto end; |
392 | } | |
393 | ||
a0377dfe | 394 | LTTNG_ASSERT(ltt_sessions_ht_by_name); |
e1bbf989 | 395 | |
6f729565 | 396 | if (lttng_ht_get_count(ltt_sessions_ht_by_id) != 0) { |
2a6ebf6b JR |
397 | /* Not empty.*/ |
398 | goto end; | |
399 | } | |
400 | ||
401 | /* | |
402 | * At this point it is expected that the `ltt_sessions_ht_by_name` ht is | |
403 | * empty. | |
404 | * | |
405 | * The removal from both hash tables is done in two different | |
406 | * places: | |
407 | * - removal from `ltt_sessions_ht_by_name` is done during | |
408 | * `session_destroy()` | |
409 | * - removal from `ltt_sessions_ht_by_id` is done later | |
410 | * in `session_release()` on the last reference put. | |
411 | * | |
412 | * This means that it is possible for `ltt_sessions_ht_by_name` to be | |
413 | * empty but for `ltt_sessions_ht_by_id` to still contain objects when | |
414 | * multiple sessions exists. The reverse is false, hence this sanity | |
415 | * check. | |
416 | */ | |
417 | LTTNG_ASSERT(lttng_ht_get_count(ltt_sessions_ht_by_name) == 0); | |
418 | empty = true; | |
23324029 | 419 | end: |
2a6ebf6b | 420 | return empty; |
23324029 JD |
421 | } |
422 | ||
423 | /* | |
ed41e570 | 424 | * Remove a ltt_session from the ltt_sessions_ht_by_id. |
e1bbf989 | 425 | * If empty, the ltt_sessions_ht_by_id/name HTs are freed. |
23324029 JD |
426 | * The session list lock must be held. |
427 | */ | |
428 | static void del_session_ht(struct ltt_session *ls) | |
429 | { | |
430 | struct lttng_ht_iter iter; | |
431 | int ret; | |
432 | ||
a0377dfe FD |
433 | LTTNG_ASSERT(ls); |
434 | LTTNG_ASSERT(ltt_sessions_ht_by_id); | |
435 | LTTNG_ASSERT(ltt_sessions_ht_by_name); | |
23324029 JD |
436 | |
437 | iter.iter.node = &ls->node.node; | |
438 | ret = lttng_ht_del(ltt_sessions_ht_by_id, &iter); | |
a0377dfe | 439 | LTTNG_ASSERT(!ret); |
23324029 JD |
440 | |
441 | if (ltt_sessions_ht_empty()) { | |
e1bbf989 | 442 | DBG("Empty ltt_sessions_ht_by_id/name, destroying hast tables"); |
23324029 JD |
443 | ltt_sessions_ht_destroy(); |
444 | } | |
445 | } | |
446 | ||
b5541356 | 447 | /* |
6c9cc2ab | 448 | * Acquire session lock |
b5541356 | 449 | */ |
54d01ffb | 450 | void session_lock(struct ltt_session *session) |
b5541356 | 451 | { |
a0377dfe | 452 | LTTNG_ASSERT(session); |
0525e9ae | 453 | |
6c9cc2ab DG |
454 | pthread_mutex_lock(&session->lock); |
455 | } | |
b5541356 | 456 | |
6c9cc2ab DG |
457 | /* |
458 | * Release session lock | |
459 | */ | |
54d01ffb | 460 | void session_unlock(struct ltt_session *session) |
6c9cc2ab | 461 | { |
a0377dfe | 462 | LTTNG_ASSERT(session); |
0525e9ae | 463 | |
6c9cc2ab | 464 | pthread_mutex_unlock(&session->lock); |
b5541356 DG |
465 | } |
466 | ||
82b69413 JG |
467 | static |
468 | int _session_set_trace_chunk_no_lock_check(struct ltt_session *session, | |
d2956687 JG |
469 | struct lttng_trace_chunk *new_trace_chunk, |
470 | struct lttng_trace_chunk **_current_trace_chunk) | |
82b69413 | 471 | { |
78fc586b | 472 | int ret = 0; |
82b69413 | 473 | unsigned int i, refs_to_acquire = 0, refs_acquired = 0, refs_to_release = 0; |
82b69413 JG |
474 | struct cds_lfht_iter iter; |
475 | struct consumer_socket *socket; | |
d2956687 JG |
476 | struct lttng_trace_chunk *current_trace_chunk; |
477 | uint64_t chunk_id; | |
478 | enum lttng_trace_chunk_status chunk_status; | |
82b69413 | 479 | |
d2956687 | 480 | rcu_read_lock(); |
82b69413 | 481 | /* |
d2956687 JG |
482 | * Ownership of current trace chunk is transferred to |
483 | * `current_trace_chunk`. | |
82b69413 | 484 | */ |
d2956687 JG |
485 | current_trace_chunk = session->current_trace_chunk; |
486 | session->current_trace_chunk = NULL; | |
82b69413 | 487 | if (session->ust_session) { |
d2956687 JG |
488 | lttng_trace_chunk_put( |
489 | session->ust_session->current_trace_chunk); | |
490 | session->ust_session->current_trace_chunk = NULL; | |
82b69413 JG |
491 | } |
492 | if (session->kernel_session) { | |
d2956687 JG |
493 | lttng_trace_chunk_put( |
494 | session->kernel_session->current_trace_chunk); | |
495 | session->kernel_session->current_trace_chunk = NULL; | |
82b69413 | 496 | } |
d2956687 JG |
497 | if (!new_trace_chunk) { |
498 | ret = 0; | |
499 | goto end; | |
82b69413 | 500 | } |
d2956687 | 501 | chunk_status = lttng_trace_chunk_get_id(new_trace_chunk, &chunk_id); |
a0377dfe | 502 | LTTNG_ASSERT(chunk_status == LTTNG_TRACE_CHUNK_STATUS_OK); |
82b69413 | 503 | |
d2956687 JG |
504 | refs_to_acquire = 1; |
505 | refs_to_acquire += !!session->ust_session; | |
506 | refs_to_acquire += !!session->kernel_session; | |
507 | ||
508 | for (refs_acquired = 0; refs_acquired < refs_to_acquire; | |
509 | refs_acquired++) { | |
510 | if (!lttng_trace_chunk_get(new_trace_chunk)) { | |
511 | ERR("Failed to acquire reference to new trace chunk of session \"%s\"", | |
512 | session->name); | |
513 | goto error; | |
82b69413 JG |
514 | } |
515 | } | |
516 | ||
d2956687 | 517 | if (session->ust_session) { |
e5add6d0 JG |
518 | const uint64_t relayd_id = |
519 | session->ust_session->consumer->net_seq_index; | |
520 | const bool is_local_trace = | |
521 | session->ust_session->consumer->type == | |
522 | CONSUMER_DST_LOCAL; | |
523 | ||
d2956687 | 524 | session->ust_session->current_trace_chunk = new_trace_chunk; |
f8a37411 | 525 | if (is_local_trace) { |
d2956687 | 526 | enum lttng_error_code ret_error_code; |
82b69413 | 527 | |
d2956687 JG |
528 | ret_error_code = ust_app_create_channel_subdirectories( |
529 | session->ust_session); | |
530 | if (ret_error_code != LTTNG_OK) { | |
82b69413 JG |
531 | goto error; |
532 | } | |
f8a37411 | 533 | } |
d2956687 JG |
534 | cds_lfht_for_each_entry( |
535 | session->ust_session->consumer->socks->ht, | |
536 | &iter, socket, node.node) { | |
537 | pthread_mutex_lock(socket->lock); | |
538 | ret = consumer_create_trace_chunk(socket, | |
539 | relayd_id, | |
5da88b0f MD |
540 | session->id, new_trace_chunk, |
541 | DEFAULT_UST_TRACE_DIR); | |
d2956687 | 542 | pthread_mutex_unlock(socket->lock); |
f8a37411 | 543 | if (ret) { |
d2956687 | 544 | goto error; |
f8a37411 JG |
545 | } |
546 | } | |
547 | } | |
82b69413 | 548 | if (session->kernel_session) { |
e5add6d0 JG |
549 | const uint64_t relayd_id = |
550 | session->kernel_session->consumer->net_seq_index; | |
551 | const bool is_local_trace = | |
552 | session->kernel_session->consumer->type == | |
553 | CONSUMER_DST_LOCAL; | |
554 | ||
d2956687 JG |
555 | session->kernel_session->current_trace_chunk = new_trace_chunk; |
556 | if (is_local_trace) { | |
557 | enum lttng_error_code ret_error_code; | |
558 | ||
559 | ret_error_code = kernel_create_channel_subdirectories( | |
560 | session->kernel_session); | |
561 | if (ret_error_code != LTTNG_OK) { | |
d2956687 JG |
562 | goto error; |
563 | } | |
f8a37411 | 564 | } |
d2956687 JG |
565 | cds_lfht_for_each_entry( |
566 | session->kernel_session->consumer->socks->ht, | |
567 | &iter, socket, node.node) { | |
568 | pthread_mutex_lock(socket->lock); | |
569 | ret = consumer_create_trace_chunk(socket, | |
570 | relayd_id, | |
5da88b0f MD |
571 | session->id, new_trace_chunk, |
572 | DEFAULT_KERNEL_TRACE_DIR); | |
d2956687 | 573 | pthread_mutex_unlock(socket->lock); |
f8a37411 | 574 | if (ret) { |
d2956687 | 575 | goto error; |
f8a37411 JG |
576 | } |
577 | } | |
578 | } | |
82b69413 JG |
579 | |
580 | /* | |
581 | * Update local current trace chunk state last, only if all remote | |
d2956687 | 582 | * creations succeeded. |
82b69413 JG |
583 | */ |
584 | session->current_trace_chunk = new_trace_chunk; | |
d2956687 JG |
585 | LTTNG_OPTIONAL_SET(&session->most_recent_chunk_id, chunk_id); |
586 | end: | |
587 | if (_current_trace_chunk) { | |
588 | *_current_trace_chunk = current_trace_chunk; | |
589 | current_trace_chunk = NULL; | |
590 | } | |
591 | end_no_move: | |
592 | rcu_read_unlock(); | |
593 | lttng_trace_chunk_put(current_trace_chunk); | |
594 | return ret; | |
595 | error: | |
82b69413 | 596 | if (session->ust_session) { |
d2956687 | 597 | session->ust_session->current_trace_chunk = NULL; |
82b69413 JG |
598 | } |
599 | if (session->kernel_session) { | |
d2956687 | 600 | session->kernel_session->current_trace_chunk = NULL; |
82b69413 | 601 | } |
f8a37411 | 602 | /* |
82b69413 JG |
603 | * Release references taken in the case where all references could not |
604 | * be acquired. | |
605 | */ | |
606 | refs_to_release = refs_to_acquire - refs_acquired; | |
607 | for (i = 0; i < refs_to_release; i++) { | |
608 | lttng_trace_chunk_put(new_trace_chunk); | |
609 | } | |
d2956687 JG |
610 | ret = -1; |
611 | goto end_no_move; | |
82b69413 JG |
612 | } |
613 | ||
d2956687 | 614 | struct lttng_trace_chunk *session_create_new_trace_chunk( |
348a81dc JG |
615 | const struct ltt_session *session, |
616 | const struct consumer_output *consumer_output_override, | |
82b69413 JG |
617 | const char *session_base_path_override, |
618 | const char *chunk_name_override) | |
619 | { | |
620 | int ret; | |
82b69413 JG |
621 | struct lttng_trace_chunk *trace_chunk = NULL; |
622 | enum lttng_trace_chunk_status chunk_status; | |
d2956687 | 623 | const time_t chunk_creation_ts = time(NULL); |
348a81dc JG |
624 | bool is_local_trace; |
625 | const char *base_path; | |
cbf53d23 | 626 | struct lttng_directory_handle *session_output_directory = NULL; |
82b69413 | 627 | const struct lttng_credentials session_credentials = { |
ff588497 JR |
628 | .uid = LTTNG_OPTIONAL_INIT_VALUE(session->uid), |
629 | .gid = LTTNG_OPTIONAL_INIT_VALUE(session->gid), | |
82b69413 JG |
630 | }; |
631 | uint64_t next_chunk_id; | |
348a81dc | 632 | const struct consumer_output *output; |
a7ceb342 | 633 | const char *new_path; |
348a81dc JG |
634 | |
635 | if (consumer_output_override) { | |
636 | output = consumer_output_override; | |
637 | } else { | |
a0377dfe | 638 | LTTNG_ASSERT(session->ust_session || session->kernel_session); |
348a81dc JG |
639 | output = session->ust_session ? |
640 | session->ust_session->consumer : | |
641 | session->kernel_session->consumer; | |
642 | } | |
643 | ||
644 | is_local_trace = output->type == CONSUMER_DST_LOCAL; | |
645 | base_path = session_base_path_override ? : | |
646 | consumer_output_get_base_path(output); | |
82b69413 | 647 | |
d2956687 JG |
648 | if (chunk_creation_ts == (time_t) -1) { |
649 | PERROR("Failed to sample time while creation session \"%s\" trace chunk", | |
82b69413 | 650 | session->name); |
82b69413 JG |
651 | goto error; |
652 | } | |
82b69413 | 653 | |
d2956687 JG |
654 | next_chunk_id = session->most_recent_chunk_id.is_set ? |
655 | session->most_recent_chunk_id.value + 1 : 0; | |
82b69413 | 656 | |
a7ceb342 MD |
657 | if (session->current_trace_chunk && |
658 | !lttng_trace_chunk_get_name_overridden(session->current_trace_chunk)) { | |
659 | chunk_status = lttng_trace_chunk_rename_path(session->current_trace_chunk, | |
660 | DEFAULT_CHUNK_TMP_OLD_DIRECTORY); | |
661 | if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) { | |
662 | goto error; | |
663 | } | |
664 | } | |
665 | if (!session->current_trace_chunk) { | |
666 | if (!session->rotated) { | |
667 | new_path = ""; | |
668 | } else { | |
669 | new_path = NULL; | |
670 | } | |
671 | } else { | |
672 | new_path = DEFAULT_CHUNK_TMP_NEW_DIRECTORY; | |
673 | } | |
674 | ||
d2956687 | 675 | trace_chunk = lttng_trace_chunk_create(next_chunk_id, |
a7ceb342 | 676 | chunk_creation_ts, new_path); |
82b69413 | 677 | if (!trace_chunk) { |
82b69413 JG |
678 | goto error; |
679 | } | |
680 | ||
681 | if (chunk_name_override) { | |
682 | chunk_status = lttng_trace_chunk_override_name(trace_chunk, | |
683 | chunk_name_override); | |
d2956687 | 684 | if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) { |
82b69413 JG |
685 | goto error; |
686 | } | |
687 | } | |
688 | ||
689 | if (!is_local_trace) { | |
690 | /* | |
691 | * No need to set crendentials and output directory | |
692 | * for remote trace chunks. | |
693 | */ | |
d2956687 | 694 | goto end; |
82b69413 JG |
695 | } |
696 | ||
697 | chunk_status = lttng_trace_chunk_set_credentials(trace_chunk, | |
698 | &session_credentials); | |
699 | if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) { | |
82b69413 JG |
700 | goto error; |
701 | } | |
702 | ||
d2956687 JG |
703 | DBG("Creating base output directory of session \"%s\" at %s", |
704 | session->name, base_path); | |
82b69413 JG |
705 | ret = utils_mkdir_recursive(base_path, S_IRWXU | S_IRWXG, |
706 | session->uid, session->gid); | |
707 | if (ret) { | |
82b69413 JG |
708 | goto error; |
709 | } | |
cbf53d23 JG |
710 | session_output_directory = lttng_directory_handle_create(base_path); |
711 | if (!session_output_directory) { | |
82b69413 JG |
712 | goto error; |
713 | } | |
714 | chunk_status = lttng_trace_chunk_set_as_owner(trace_chunk, | |
cbf53d23 JG |
715 | session_output_directory); |
716 | lttng_directory_handle_put(session_output_directory); | |
717 | session_output_directory = NULL; | |
82b69413 | 718 | if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) { |
82b69413 JG |
719 | goto error; |
720 | } | |
d2956687 JG |
721 | end: |
722 | return trace_chunk; | |
82b69413 | 723 | error: |
cbf53d23 | 724 | lttng_directory_handle_put(session_output_directory); |
82b69413 | 725 | lttng_trace_chunk_put(trace_chunk); |
d2956687 JG |
726 | trace_chunk = NULL; |
727 | goto end; | |
728 | } | |
729 | ||
343defc2 | 730 | int session_close_trace_chunk(struct ltt_session *session, |
bbc4768c | 731 | struct lttng_trace_chunk *trace_chunk, |
343defc2 | 732 | enum lttng_trace_chunk_command_type close_command, |
ecd1a12f | 733 | char *closed_trace_chunk_path) |
d2956687 JG |
734 | { |
735 | int ret = 0; | |
736 | bool error_occurred = false; | |
737 | struct cds_lfht_iter iter; | |
738 | struct consumer_socket *socket; | |
739 | enum lttng_trace_chunk_status chunk_status; | |
740 | const time_t chunk_close_timestamp = time(NULL); | |
a7ceb342 | 741 | const char *new_path; |
d2956687 | 742 | |
343defc2 MD |
743 | chunk_status = lttng_trace_chunk_set_close_command( |
744 | trace_chunk, close_command); | |
745 | if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) { | |
746 | ret = -1; | |
747 | goto end; | |
bbc4768c JG |
748 | } |
749 | ||
d2956687 JG |
750 | if (chunk_close_timestamp == (time_t) -1) { |
751 | ERR("Failed to sample the close timestamp of the current trace chunk of session \"%s\"", | |
752 | session->name); | |
753 | ret = -1; | |
754 | goto end; | |
755 | } | |
a7ceb342 MD |
756 | |
757 | if (close_command == LTTNG_TRACE_CHUNK_COMMAND_TYPE_DELETE && !session->rotated) { | |
758 | /* New chunk stays in session output directory. */ | |
759 | new_path = ""; | |
760 | } else { | |
761 | /* Use chunk name for new chunk. */ | |
762 | new_path = NULL; | |
763 | } | |
764 | if (session->current_trace_chunk && | |
765 | !lttng_trace_chunk_get_name_overridden(session->current_trace_chunk)) { | |
766 | /* Rename new chunk path. */ | |
767 | chunk_status = lttng_trace_chunk_rename_path(session->current_trace_chunk, | |
768 | new_path); | |
769 | if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) { | |
770 | ret = -1; | |
771 | goto end; | |
772 | } | |
773 | } | |
774 | if (!lttng_trace_chunk_get_name_overridden(trace_chunk) && | |
775 | close_command == LTTNG_TRACE_CHUNK_COMMAND_TYPE_NO_OPERATION) { | |
776 | const char *old_path; | |
777 | ||
778 | if (!session->rotated) { | |
779 | old_path = ""; | |
780 | } else { | |
781 | old_path = NULL; | |
782 | } | |
783 | /* We need to move back the .tmp_old_chunk to its rightful place. */ | |
784 | chunk_status = lttng_trace_chunk_rename_path(trace_chunk, | |
785 | old_path); | |
786 | if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) { | |
787 | ret = -1; | |
788 | goto end; | |
789 | } | |
790 | } | |
791 | if (close_command == LTTNG_TRACE_CHUNK_COMMAND_TYPE_MOVE_TO_COMPLETED) { | |
792 | session->rotated = true; | |
793 | } | |
d2956687 JG |
794 | chunk_status = lttng_trace_chunk_set_close_timestamp(trace_chunk, |
795 | chunk_close_timestamp); | |
796 | if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) { | |
797 | ERR("Failed to set the close timestamp of the current trace chunk of session \"%s\"", | |
798 | session->name); | |
799 | ret = -1; | |
800 | goto end; | |
801 | } | |
802 | ||
803 | if (session->ust_session) { | |
0a184d4e JG |
804 | const uint64_t relayd_id = |
805 | session->ust_session->consumer->net_seq_index; | |
806 | ||
d2956687 JG |
807 | cds_lfht_for_each_entry( |
808 | session->ust_session->consumer->socks->ht, | |
809 | &iter, socket, node.node) { | |
810 | pthread_mutex_lock(socket->lock); | |
811 | ret = consumer_close_trace_chunk(socket, | |
0a184d4e | 812 | relayd_id, |
d2956687 | 813 | session->id, |
ecd1a12f | 814 | trace_chunk, closed_trace_chunk_path); |
d2956687 JG |
815 | pthread_mutex_unlock(socket->lock); |
816 | if (ret) { | |
817 | ERR("Failed to close trace chunk on user space consumer"); | |
818 | error_occurred = true; | |
819 | } | |
820 | } | |
821 | } | |
822 | if (session->kernel_session) { | |
0a184d4e JG |
823 | const uint64_t relayd_id = |
824 | session->kernel_session->consumer->net_seq_index; | |
825 | ||
d2956687 JG |
826 | cds_lfht_for_each_entry( |
827 | session->kernel_session->consumer->socks->ht, | |
828 | &iter, socket, node.node) { | |
829 | pthread_mutex_lock(socket->lock); | |
830 | ret = consumer_close_trace_chunk(socket, | |
0a184d4e | 831 | relayd_id, |
d2956687 | 832 | session->id, |
ecd1a12f | 833 | trace_chunk, closed_trace_chunk_path); |
d2956687 JG |
834 | pthread_mutex_unlock(socket->lock); |
835 | if (ret) { | |
836 | ERR("Failed to close trace chunk on kernel consumer"); | |
837 | error_occurred = true; | |
838 | } | |
839 | } | |
840 | } | |
841 | ret = error_occurred ? -1 : 0; | |
82b69413 | 842 | end: |
d2956687 | 843 | return ret; |
82b69413 JG |
844 | } |
845 | ||
04ed9e10 JG |
846 | /* |
847 | * This function skips the metadata channel as the begin/end timestamps of a | |
848 | * metadata packet are useless. | |
849 | * | |
850 | * Moreover, opening a packet after a "clear" will cause problems for live | |
851 | * sessions as it will introduce padding that was not part of the first trace | |
852 | * chunk. The relay daemon expects the content of the metadata stream of | |
853 | * successive metadata trace chunks to be strict supersets of one another. | |
854 | * | |
855 | * For example, flushing a packet at the beginning of the metadata stream of | |
856 | * a trace chunk resulting from a "clear" session command will cause the | |
857 | * size of the metadata stream of the new trace chunk to not match the size of | |
858 | * the metadata stream of the original chunk. This will confuse the relay | |
859 | * daemon as the same "offset" in a metadata stream will no longer point | |
860 | * to the same content. | |
861 | */ | |
862 | static | |
863 | enum lttng_error_code session_kernel_open_packets(struct ltt_session *session) | |
864 | { | |
865 | enum lttng_error_code ret = LTTNG_OK; | |
866 | struct consumer_socket *socket; | |
867 | struct lttng_ht_iter iter; | |
868 | struct cds_lfht_node *node; | |
869 | struct ltt_kernel_channel *chan; | |
870 | ||
871 | rcu_read_lock(); | |
872 | ||
873 | cds_lfht_first(session->kernel_session->consumer->socks->ht, &iter.iter); | |
874 | node = cds_lfht_iter_get_node(&iter.iter); | |
875 | socket = container_of(node, typeof(*socket), node.node); | |
876 | ||
877 | cds_list_for_each_entry(chan, | |
878 | &session->kernel_session->channel_list.head, list) { | |
879 | int open_ret; | |
880 | ||
881 | DBG("Open packet of kernel channel: channel key = %" PRIu64 | |
882 | ", session name = %s, session_id = %" PRIu64, | |
883 | chan->key, session->name, session->id); | |
884 | ||
885 | open_ret = consumer_open_channel_packets(socket, chan->key); | |
886 | if (open_ret < 0) { | |
887 | /* General error (no known error expected). */ | |
888 | ret = LTTNG_ERR_UNK; | |
889 | goto end; | |
890 | } | |
891 | } | |
892 | ||
893 | end: | |
894 | rcu_read_unlock(); | |
895 | return ret; | |
896 | } | |
897 | ||
898 | enum lttng_error_code session_open_packets(struct ltt_session *session) | |
899 | { | |
900 | enum lttng_error_code ret = LTTNG_OK; | |
901 | ||
902 | DBG("Opening packets of session channels: session name = %s, session id = %" PRIu64, | |
903 | session->name, session->id); | |
904 | ||
905 | if (session->ust_session) { | |
906 | ret = ust_app_open_packets(session); | |
907 | if (ret != LTTNG_OK) { | |
908 | goto end; | |
909 | } | |
910 | } | |
911 | ||
912 | if (session->kernel_session) { | |
913 | ret = session_kernel_open_packets(session); | |
914 | if (ret != LTTNG_OK) { | |
915 | goto end; | |
916 | } | |
917 | } | |
918 | ||
919 | end: | |
920 | return ret; | |
921 | } | |
922 | ||
82b69413 JG |
923 | /* |
924 | * Set a session's current trace chunk. | |
925 | * | |
926 | * Must be called with the session lock held. | |
927 | */ | |
928 | int session_set_trace_chunk(struct ltt_session *session, | |
d2956687 JG |
929 | struct lttng_trace_chunk *new_trace_chunk, |
930 | struct lttng_trace_chunk **current_trace_chunk) | |
82b69413 JG |
931 | { |
932 | ASSERT_LOCKED(session->lock); | |
d2956687 JG |
933 | return _session_set_trace_chunk_no_lock_check(session, new_trace_chunk, |
934 | current_trace_chunk); | |
82b69413 JG |
935 | } |
936 | ||
3e3665b8 JG |
937 | static |
938 | void session_notify_destruction(const struct ltt_session *session) | |
939 | { | |
940 | size_t i; | |
941 | const size_t count = lttng_dynamic_array_get_count( | |
942 | &session->destroy_notifiers); | |
943 | ||
944 | for (i = 0; i < count; i++) { | |
945 | const struct ltt_session_destroy_notifier_element *element = | |
7966af57 | 946 | (ltt_session_destroy_notifier_element *) lttng_dynamic_array_get_element( |
3e3665b8 JG |
947 | &session->destroy_notifiers, i); |
948 | ||
949 | element->notifier(session, element->user_data); | |
950 | } | |
951 | } | |
952 | ||
ccbdaca4 MD |
953 | /* |
954 | * Fire each clear notifier once, and remove them from the array. | |
955 | */ | |
956 | void session_notify_clear(struct ltt_session *session) | |
957 | { | |
958 | size_t i; | |
959 | const size_t count = lttng_dynamic_array_get_count( | |
960 | &session->clear_notifiers); | |
961 | ||
962 | for (i = 0; i < count; i++) { | |
963 | const struct ltt_session_clear_notifier_element *element = | |
7966af57 | 964 | (ltt_session_clear_notifier_element *) lttng_dynamic_array_get_element( |
ccbdaca4 MD |
965 | &session->clear_notifiers, i); |
966 | ||
967 | element->notifier(session, element->user_data); | |
968 | } | |
969 | lttng_dynamic_array_clear(&session->clear_notifiers); | |
970 | } | |
971 | ||
e32d7f27 JG |
972 | static |
973 | void session_release(struct urcu_ref *ref) | |
974 | { | |
975 | int ret; | |
976 | struct ltt_ust_session *usess; | |
977 | struct ltt_kernel_session *ksess; | |
978 | struct ltt_session *session = container_of(ref, typeof(*session), ref); | |
7fdbed1c | 979 | const bool session_published = session->published; |
e32d7f27 | 980 | |
a0377dfe | 981 | LTTNG_ASSERT(!session->chunk_being_archived); |
d2956687 | 982 | |
e32d7f27 JG |
983 | usess = session->ust_session; |
984 | ksess = session->kernel_session; | |
3e3665b8 | 985 | |
f8a37411 | 986 | /* Clean kernel session teardown, keeping data for destroy notifier. */ |
e32d7f27 JG |
987 | kernel_destroy_session(ksess); |
988 | ||
d070c424 | 989 | /* UST session teardown, keeping data for destroy notifier. */ |
e32d7f27 JG |
990 | if (usess) { |
991 | /* Close any relayd session */ | |
992 | consumer_output_send_destroy_relayd(usess->consumer); | |
993 | ||
994 | /* Destroy every UST application related to this session. */ | |
995 | ret = ust_app_destroy_trace_all(usess); | |
996 | if (ret) { | |
997 | ERR("Error in ust_app_destroy_trace_all"); | |
998 | } | |
999 | ||
d070c424 | 1000 | /* Clean up the rest, keeping destroy notifier data. */ |
e32d7f27 JG |
1001 | trace_ust_destroy_session(usess); |
1002 | } | |
1003 | ||
1004 | /* | |
1005 | * Must notify the kernel thread here to update it's poll set in order to | |
1006 | * remove the channel(s)' fd just destroyed. | |
1007 | */ | |
412d7227 | 1008 | ret = notify_thread_pipe(the_kernel_poll_pipe[1]); |
e32d7f27 JG |
1009 | if (ret < 0) { |
1010 | PERROR("write kernel poll pipe"); | |
1011 | } | |
1012 | ||
1013 | DBG("Destroying session %s (id %" PRIu64 ")", session->name, session->id); | |
e32d7f27 | 1014 | |
e32d7f27 | 1015 | snapshot_destroy(&session->snapshot); |
99d688f2 | 1016 | |
82b69413 JG |
1017 | pthread_mutex_destroy(&session->lock); |
1018 | ||
7fdbed1c | 1019 | if (session_published) { |
f1494934 | 1020 | ASSERT_LOCKED(the_session_list.lock); |
f4cc5e83 JG |
1021 | del_session_list(session); |
1022 | del_session_ht(session); | |
f4cc5e83 | 1023 | } |
7fdbed1c | 1024 | session_notify_destruction(session); |
d070c424 | 1025 | |
1ac9cb73 | 1026 | consumer_output_put(session->consumer); |
d070c424 MD |
1027 | kernel_free_session(ksess); |
1028 | session->kernel_session = NULL; | |
1029 | if (usess) { | |
1030 | trace_ust_free_session(usess); | |
1031 | session->ust_session = NULL; | |
1032 | } | |
7fdbed1c | 1033 | lttng_dynamic_array_reset(&session->destroy_notifiers); |
ccbdaca4 | 1034 | lttng_dynamic_array_reset(&session->clear_notifiers); |
d2956687 | 1035 | free(session->last_archived_chunk_name); |
6fa5fe7c | 1036 | free(session->base_path); |
c08136a3 | 1037 | lttng_trigger_put(session->rotate_trigger); |
e32d7f27 | 1038 | free(session); |
7fdbed1c JG |
1039 | if (session_published) { |
1040 | /* | |
1041 | * Broadcast after free-ing to ensure the memory is | |
1042 | * reclaimed before the main thread exits. | |
1043 | */ | |
f1494934 JG |
1044 | ASSERT_LOCKED(the_session_list.lock); |
1045 | pthread_cond_broadcast(&the_session_list.removal_cond); | |
7fdbed1c | 1046 | } |
e32d7f27 JG |
1047 | } |
1048 | ||
1049 | /* | |
1050 | * Acquire a reference to a session. | |
1051 | * This function may fail (return false); its return value must be checked. | |
1052 | */ | |
1053 | bool session_get(struct ltt_session *session) | |
1054 | { | |
1055 | return urcu_ref_get_unless_zero(&session->ref); | |
1056 | } | |
1057 | ||
1058 | /* | |
1059 | * Release a reference to a session. | |
1060 | */ | |
1061 | void session_put(struct ltt_session *session) | |
1062 | { | |
b178f53e JG |
1063 | if (!session) { |
1064 | return; | |
1065 | } | |
e32d7f27 JG |
1066 | /* |
1067 | * The session list lock must be held as any session_put() | |
1068 | * may cause the removal of the session from the session_list. | |
1069 | */ | |
f1494934 | 1070 | ASSERT_LOCKED(the_session_list.lock); |
a0377dfe | 1071 | LTTNG_ASSERT(session->ref.refcount); |
e32d7f27 JG |
1072 | urcu_ref_put(&session->ref, session_release); |
1073 | } | |
1074 | ||
1075 | /* | |
1076 | * Destroy a session. | |
1077 | * | |
1078 | * This method does not immediately release/free the session as other | |
1079 | * components may still hold a reference to the session. However, | |
1080 | * the session should no longer be presented to the user. | |
1081 | * | |
1082 | * Releases the session list's reference to the session | |
1083 | * and marks it as destroyed. Iterations on the session list should be | |
1084 | * mindful of the "destroyed" flag. | |
1085 | */ | |
1086 | void session_destroy(struct ltt_session *session) | |
1087 | { | |
ed41e570 JR |
1088 | int ret; |
1089 | struct lttng_ht_iter iter; | |
1090 | ||
a0377dfe | 1091 | LTTNG_ASSERT(!session->destroyed); |
e32d7f27 | 1092 | session->destroyed = true; |
ed41e570 JR |
1093 | |
1094 | /* | |
1095 | * Remove immediately from the "session by name" hash table. Only one | |
1096 | * session is expected to exist with a given name for at any given time. | |
1097 | * | |
1098 | * Even if a session still technically exists for a little while longer, | |
1099 | * there is no point in performing action on a "destroyed" session. | |
1100 | */ | |
1101 | iter.iter.node = &session->node_by_name.node; | |
1102 | ret = lttng_ht_del(ltt_sessions_ht_by_name, &iter); | |
1103 | LTTNG_ASSERT(!ret); | |
1104 | ||
e32d7f27 JG |
1105 | session_put(session); |
1106 | } | |
1107 | ||
3e3665b8 JG |
1108 | int session_add_destroy_notifier(struct ltt_session *session, |
1109 | ltt_session_destroy_notifier notifier, void *user_data) | |
1110 | { | |
1111 | const struct ltt_session_destroy_notifier_element element = { | |
1112 | .notifier = notifier, | |
1113 | .user_data = user_data | |
1114 | }; | |
1115 | ||
1116 | return lttng_dynamic_array_add_element(&session->destroy_notifiers, | |
1117 | &element); | |
1118 | } | |
1119 | ||
ccbdaca4 MD |
1120 | int session_add_clear_notifier(struct ltt_session *session, |
1121 | ltt_session_clear_notifier notifier, void *user_data) | |
1122 | { | |
1123 | const struct ltt_session_clear_notifier_element element = { | |
1124 | .notifier = notifier, | |
1125 | .user_data = user_data | |
1126 | }; | |
1127 | ||
1128 | return lttng_dynamic_array_add_element(&session->clear_notifiers, | |
1129 | &element); | |
1130 | } | |
1131 | ||
5b74c7b1 | 1132 | /* |
74babd95 | 1133 | * Return a ltt_session structure ptr that matches name. If no session found, |
23324029 | 1134 | * NULL is returned. This must be called with the session list lock held using |
74babd95 | 1135 | * session_lock_list and session_unlock_list. |
e32d7f27 | 1136 | * A reference to the session is implicitly acquired by this function. |
5b74c7b1 | 1137 | */ |
58a1a227 | 1138 | struct ltt_session *session_find_by_name(const char *name) |
5b74c7b1 | 1139 | { |
5b74c7b1 DG |
1140 | struct ltt_session *iter; |
1141 | ||
a0377dfe | 1142 | LTTNG_ASSERT(name); |
f1494934 | 1143 | ASSERT_LOCKED(the_session_list.lock); |
0525e9ae | 1144 | |
5f822d0a DG |
1145 | DBG2("Trying to find session by name %s", name); |
1146 | ||
f1494934 | 1147 | cds_list_for_each_entry(iter, &the_session_list.head, list) { |
e32d7f27 JG |
1148 | if (!strncmp(iter->name, name, NAME_MAX) && |
1149 | !iter->destroyed) { | |
74babd95 | 1150 | goto found; |
5b74c7b1 DG |
1151 | } |
1152 | } | |
1153 | ||
e32d7f27 | 1154 | return NULL; |
74babd95 | 1155 | found: |
e32d7f27 | 1156 | return session_get(iter) ? iter : NULL; |
5b74c7b1 DG |
1157 | } |
1158 | ||
23324029 JD |
1159 | /* |
1160 | * Return an ltt_session that matches the id. If no session is found, | |
1161 | * NULL is returned. This must be called with rcu_read_lock and | |
1162 | * session list lock held (to guarantee the lifetime of the session). | |
1163 | */ | |
1164 | struct ltt_session *session_find_by_id(uint64_t id) | |
1165 | { | |
1166 | struct lttng_ht_node_u64 *node; | |
1167 | struct lttng_ht_iter iter; | |
1168 | struct ltt_session *ls; | |
1169 | ||
48b7cdc2 | 1170 | ASSERT_RCU_READ_LOCKED(); |
f1494934 | 1171 | ASSERT_LOCKED(the_session_list.lock); |
e32d7f27 | 1172 | |
d68ec974 JG |
1173 | if (!ltt_sessions_ht_by_id) { |
1174 | goto end; | |
1175 | } | |
1176 | ||
23324029 JD |
1177 | lttng_ht_lookup(ltt_sessions_ht_by_id, &id, &iter); |
1178 | node = lttng_ht_iter_get_node_u64(&iter); | |
1179 | if (node == NULL) { | |
d68ec974 | 1180 | goto end; |
23324029 JD |
1181 | } |
1182 | ls = caa_container_of(node, struct ltt_session, node); | |
1183 | ||
1184 | DBG3("Session %" PRIu64 " found by id.", id); | |
e32d7f27 | 1185 | return session_get(ls) ? ls : NULL; |
23324029 | 1186 | |
d68ec974 | 1187 | end: |
23324029 JD |
1188 | DBG3("Session %" PRIu64 " NOT found by id", id); |
1189 | return NULL; | |
1190 | } | |
1191 | ||
5b74c7b1 | 1192 | /* |
b178f53e JG |
1193 | * Create a new session and add it to the session list. |
1194 | * Session list lock must be held by the caller. | |
5b74c7b1 | 1195 | */ |
b178f53e | 1196 | enum lttng_error_code session_create(const char *name, uid_t uid, gid_t gid, |
e3876bf0 | 1197 | struct ltt_session **out_session) |
5b74c7b1 | 1198 | { |
f3ed775e | 1199 | int ret; |
b178f53e JG |
1200 | enum lttng_error_code ret_code; |
1201 | struct ltt_session *new_session = NULL; | |
e07ae692 | 1202 | |
f1494934 | 1203 | ASSERT_LOCKED(the_session_list.lock); |
b178f53e JG |
1204 | if (name) { |
1205 | struct ltt_session *clashing_session; | |
1206 | ||
1207 | clashing_session = session_find_by_name(name); | |
1208 | if (clashing_session) { | |
1209 | session_put(clashing_session); | |
1210 | ret_code = LTTNG_ERR_EXIST_SESS; | |
1211 | goto error; | |
1212 | } | |
1213 | } | |
64803277 | 1214 | new_session = zmalloc<ltt_session>(); |
b178f53e JG |
1215 | if (!new_session) { |
1216 | PERROR("Failed to allocate an ltt_session structure"); | |
1217 | ret_code = LTTNG_ERR_NOMEM; | |
1218 | goto error; | |
5b74c7b1 DG |
1219 | } |
1220 | ||
3e3665b8 | 1221 | lttng_dynamic_array_init(&new_session->destroy_notifiers, |
93bed9fe JG |
1222 | sizeof(struct ltt_session_destroy_notifier_element), |
1223 | NULL); | |
ccbdaca4 MD |
1224 | lttng_dynamic_array_init(&new_session->clear_notifiers, |
1225 | sizeof(struct ltt_session_clear_notifier_element), | |
1226 | NULL); | |
e32d7f27 | 1227 | urcu_ref_init(&new_session->ref); |
b178f53e | 1228 | pthread_mutex_init(&new_session->lock, NULL); |
e32d7f27 | 1229 | |
b178f53e JG |
1230 | new_session->creation_time = time(NULL); |
1231 | if (new_session->creation_time == (time_t) -1) { | |
1232 | PERROR("Failed to sample session creation time"); | |
1233 | ret_code = LTTNG_ERR_SESSION_FAIL; | |
f3ed775e DG |
1234 | goto error; |
1235 | } | |
1236 | ||
b178f53e JG |
1237 | /* Create default consumer output. */ |
1238 | new_session->consumer = consumer_create_output(CONSUMER_DST_LOCAL); | |
1239 | if (new_session->consumer == NULL) { | |
1240 | ret_code = LTTNG_ERR_NOMEM; | |
1c1c3634 DG |
1241 | goto error; |
1242 | } | |
1243 | ||
b178f53e JG |
1244 | if (name) { |
1245 | ret = lttng_strncpy(new_session->name, name, sizeof(new_session->name)); | |
1246 | if (ret) { | |
1247 | ret_code = LTTNG_ERR_SESSION_INVALID_CHAR; | |
1248 | goto error; | |
1249 | } | |
1250 | ret = validate_name(name); | |
1251 | if (ret < 0) { | |
1252 | ret_code = LTTNG_ERR_SESSION_INVALID_CHAR; | |
1253 | goto error; | |
1254 | } | |
1255 | } else { | |
1256 | int i = 0; | |
1257 | bool found_name = false; | |
1258 | char datetime[16]; | |
1259 | struct tm *timeinfo; | |
1260 | ||
1261 | timeinfo = localtime(&new_session->creation_time); | |
1262 | if (!timeinfo) { | |
1263 | ret_code = LTTNG_ERR_SESSION_FAIL; | |
1264 | goto error; | |
1265 | } | |
1266 | strftime(datetime, sizeof(datetime), "%Y%m%d-%H%M%S", timeinfo); | |
1267 | for (i = 0; i < INT_MAX; i++) { | |
1268 | struct ltt_session *clashing_session; | |
1269 | ||
1270 | if (i == 0) { | |
1271 | ret = snprintf(new_session->name, | |
1272 | sizeof(new_session->name), | |
1273 | "%s-%s", | |
1274 | DEFAULT_SESSION_NAME, | |
1275 | datetime); | |
1276 | } else { | |
1277 | ret = snprintf(new_session->name, | |
1278 | sizeof(new_session->name), | |
1279 | "%s%d-%s", | |
1280 | DEFAULT_SESSION_NAME, i, | |
1281 | datetime); | |
1282 | } | |
46ef2188 | 1283 | new_session->name_contains_creation_time = true; |
b178f53e JG |
1284 | if (ret == -1 || ret >= sizeof(new_session->name)) { |
1285 | /* | |
1286 | * Null-terminate in case the name is used | |
1287 | * in logging statements. | |
1288 | */ | |
1289 | new_session->name[sizeof(new_session->name) - 1] = '\0'; | |
1290 | ret_code = LTTNG_ERR_SESSION_FAIL; | |
1291 | goto error; | |
1292 | } | |
1293 | ||
1294 | clashing_session = | |
1295 | session_find_by_name(new_session->name); | |
1296 | session_put(clashing_session); | |
1297 | if (!clashing_session) { | |
1298 | found_name = true; | |
1299 | break; | |
1300 | } | |
1301 | } | |
1302 | if (found_name) { | |
1303 | DBG("Generated session name \"%s\"", new_session->name); | |
1304 | new_session->has_auto_generated_name = true; | |
1305 | } else { | |
1306 | ERR("Failed to auto-generate a session name"); | |
1307 | ret_code = LTTNG_ERR_SESSION_FAIL; | |
1308 | goto error; | |
1309 | } | |
1310 | } | |
1311 | ||
d3e2ba59 | 1312 | ret = gethostname(new_session->hostname, sizeof(new_session->hostname)); |
73184835 DG |
1313 | if (ret < 0) { |
1314 | if (errno == ENAMETOOLONG) { | |
1315 | new_session->hostname[sizeof(new_session->hostname) - 1] = '\0'; | |
b178f53e JG |
1316 | ERR("Hostname exceeds the maximal permitted length and has been truncated to %s", |
1317 | new_session->hostname); | |
73184835 | 1318 | } else { |
b178f53e | 1319 | ret_code = LTTNG_ERR_SESSION_FAIL; |
73184835 DG |
1320 | goto error; |
1321 | } | |
d3e2ba59 JD |
1322 | } |
1323 | ||
6df2e2c9 MD |
1324 | new_session->uid = uid; |
1325 | new_session->gid = gid; | |
1326 | ||
6dc3064a DG |
1327 | ret = snapshot_init(&new_session->snapshot); |
1328 | if (ret < 0) { | |
b178f53e | 1329 | ret_code = LTTNG_ERR_NOMEM; |
6dc3064a DG |
1330 | goto error; |
1331 | } | |
1332 | ||
4f23c583 | 1333 | new_session->rotation_state = LTTNG_ROTATION_STATE_NO_ROTATION; |
92816cc3 | 1334 | |
b178f53e | 1335 | /* Add new session to the session list. */ |
a991f516 | 1336 | new_session->id = add_session_list(new_session); |
b178f53e | 1337 | |
23324029 JD |
1338 | /* |
1339 | * Add the new session to the ltt_sessions_ht_by_id. | |
1340 | * No ownership is taken by the hash table; it is merely | |
1341 | * a wrapper around the session list used for faster access | |
1342 | * by session id. | |
1343 | */ | |
1344 | add_session_ht(new_session); | |
f4cc5e83 | 1345 | new_session->published = true; |
b5541356 | 1346 | |
a4b92340 | 1347 | /* |
b178f53e JG |
1348 | * Consumer is left to NULL since the create_session_uri command will |
1349 | * set it up and, if valid, assign it to the session. | |
a4b92340 | 1350 | */ |
b178f53e JG |
1351 | DBG("Tracing session %s created with ID %" PRIu64 " by uid = %d, gid = %d", |
1352 | new_session->name, new_session->id, new_session->uid, | |
1353 | new_session->gid); | |
1354 | ret_code = LTTNG_OK; | |
1355 | end: | |
1356 | if (new_session) { | |
1357 | (void) session_get(new_session); | |
1358 | *out_session = new_session; | |
1359 | } | |
1360 | return ret_code; | |
5b74c7b1 | 1361 | error: |
f4cc5e83 | 1362 | session_put(new_session); |
b178f53e JG |
1363 | new_session = NULL; |
1364 | goto end; | |
5b74c7b1 | 1365 | } |
2f77fc4b DG |
1366 | |
1367 | /* | |
d7b377ed | 1368 | * Check if the UID matches the session. Root user has access to all |
2f77fc4b DG |
1369 | * sessions. |
1370 | */ | |
d7b377ed | 1371 | bool session_access_ok(struct ltt_session *session, uid_t uid) |
2f77fc4b | 1372 | { |
a0377dfe | 1373 | LTTNG_ASSERT(session); |
d7b377ed | 1374 | return (uid == session->uid) || uid == 0; |
2f77fc4b | 1375 | } |
2961f09e JG |
1376 | |
1377 | /* | |
1378 | * Set a session's rotation state and reset all associated state. | |
1379 | * | |
1380 | * This function resets the rotation state (check timers, pending | |
1381 | * flags, etc.) and sets the result of the last rotation. The result | |
1382 | * can be queries by a liblttng-ctl client. | |
1383 | * | |
1384 | * Be careful of the result passed to this function. For instance, | |
1385 | * on failure to launch a rotation, a client will expect the rotation | |
83ed9e90 | 1386 | * state to be set to "NO_ROTATION". If an error occurred while the |
2961f09e JG |
1387 | * rotation was "ONGOING", result should be set to "ERROR", which will |
1388 | * allow a client to report it. | |
1389 | * | |
1390 | * Must be called with the session and session_list locks held. | |
1391 | */ | |
1392 | int session_reset_rotation_state(struct ltt_session *session, | |
1393 | enum lttng_rotation_state result) | |
1394 | { | |
1395 | int ret = 0; | |
1396 | ||
f1494934 | 1397 | ASSERT_LOCKED(the_session_list.lock); |
2961f09e JG |
1398 | ASSERT_LOCKED(session->lock); |
1399 | ||
2961f09e JG |
1400 | session->rotation_state = result; |
1401 | if (session->rotation_pending_check_timer_enabled) { | |
1402 | ret = timer_session_rotation_pending_check_stop(session); | |
1403 | } | |
d2956687 JG |
1404 | if (session->chunk_being_archived) { |
1405 | uint64_t chunk_id; | |
1406 | enum lttng_trace_chunk_status chunk_status; | |
1407 | ||
1408 | chunk_status = lttng_trace_chunk_get_id( | |
1409 | session->chunk_being_archived, | |
1410 | &chunk_id); | |
a0377dfe | 1411 | LTTNG_ASSERT(chunk_status == LTTNG_TRACE_CHUNK_STATUS_OK); |
d2956687 JG |
1412 | LTTNG_OPTIONAL_SET(&session->last_archived_chunk_id, |
1413 | chunk_id); | |
1414 | lttng_trace_chunk_put(session->chunk_being_archived); | |
1415 | session->chunk_being_archived = NULL; | |
ccbdaca4 MD |
1416 | /* |
1417 | * Fire the clear reply notifiers if we are completing a clear | |
1418 | * rotation. | |
1419 | */ | |
1420 | session_notify_clear(session); | |
d2956687 | 1421 | } |
2961f09e JG |
1422 | return ret; |
1423 | } | |
e1bbf989 JR |
1424 | |
1425 | /* | |
1426 | * Sample the id of a session looked up via its name. | |
1427 | * Here the term "sampling" hint the caller that this return the id at a given | |
1428 | * point in time with no guarantee that the session for which the id was | |
1429 | * sampled still exist at that point. | |
1430 | * | |
1431 | * Return 0 when the session is not found, | |
1432 | * Return 1 when the session is found and set `id`. | |
1433 | */ | |
1434 | bool sample_session_id_by_name(const char *name, uint64_t *id) | |
1435 | { | |
1436 | bool found = false; | |
1437 | struct lttng_ht_node_str *node; | |
1438 | struct lttng_ht_iter iter; | |
1439 | struct ltt_session *ls; | |
1440 | ||
1441 | rcu_read_lock(); | |
1442 | ||
1443 | if (!ltt_sessions_ht_by_name) { | |
1444 | found = false; | |
1445 | goto end; | |
1446 | } | |
1447 | ||
1448 | lttng_ht_lookup(ltt_sessions_ht_by_name, name, &iter); | |
1449 | node = lttng_ht_iter_get_node_str(&iter); | |
1450 | if (node == NULL) { | |
1451 | found = false; | |
1452 | goto end; | |
1453 | } | |
1454 | ||
1455 | ls = caa_container_of(node, struct ltt_session, node_by_name); | |
1456 | *id = ls->id; | |
1457 | found = true; | |
1458 | ||
1459 | DBG3("Session id `%" PRIu64 "` sampled for session `%s", *id, name); | |
1460 | end: | |
1461 | rcu_read_unlock(); | |
1462 | return found; | |
1463 | } |