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6e0be6cc JD |
1 | /* |
2 | * Copyright (C) 2017 - Julien Desfossez <jdesfossez@efficios.com> | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify it | |
5 | * under the terms of the GNU General Public License, version 2 only, as | |
6 | * published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, but WITHOUT | |
9 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
10 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
11 | * more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public License along with | |
14 | * this program; if not, write to the Free Software Foundation, Inc., 51 | |
15 | * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
16 | */ | |
17 | ||
18 | #define _LGPL_SOURCE | |
19 | #include <lttng/trigger/trigger.h> | |
20 | #include <common/error.h> | |
21 | #include <common/config/session-config.h> | |
22 | #include <common/defaults.h> | |
23 | #include <common/utils.h> | |
24 | #include <common/futex.h> | |
25 | #include <common/align.h> | |
26 | #include <common/time.h> | |
27 | #include <common/hashtable/utils.h> | |
28 | #include <sys/eventfd.h> | |
29 | #include <sys/stat.h> | |
30 | #include <time.h> | |
31 | #include <signal.h> | |
32 | #include <inttypes.h> | |
33 | ||
34 | #include <common/kernel-ctl/kernel-ctl.h> | |
35 | #include "rotation-thread.h" | |
36 | #include "lttng-sessiond.h" | |
37 | #include "health-sessiond.h" | |
e8ed1ed1 | 38 | #include "rotate.h" |
6e0be6cc | 39 | #include "cmd.h" |
69cda452 | 40 | #include "session.h" |
0d2ff20e | 41 | #include "sessiond-timer.h" |
6e0be6cc JD |
42 | |
43 | #include <urcu.h> | |
44 | #include <urcu/list.h> | |
45 | #include <urcu/rculfhash.h> | |
46 | ||
47 | struct cds_lfht *channel_pending_rotate_ht; | |
48 | ||
6e0be6cc JD |
49 | static |
50 | void channel_rotation_info_destroy(struct rotation_channel_info *channel_info) | |
51 | { | |
52 | assert(channel_info); | |
53 | free(channel_info); | |
54 | } | |
55 | ||
6e0be6cc JD |
56 | static |
57 | int match_channel_info(struct cds_lfht_node *node, const void *key) | |
58 | { | |
59 | struct rotation_channel_key *channel_key = (struct rotation_channel_key *) key; | |
60 | struct rotation_channel_info *channel_info; | |
61 | ||
62 | channel_info = caa_container_of(node, struct rotation_channel_info, | |
63 | rotate_channels_ht_node); | |
64 | ||
65 | return !!((channel_key->key == channel_info->channel_key.key) && | |
66 | (channel_key->domain == channel_info->channel_key.domain)); | |
67 | } | |
68 | ||
69 | static | |
70 | struct rotation_channel_info *lookup_channel_pending(uint64_t key, | |
71 | enum lttng_domain_type domain) | |
72 | { | |
73 | struct cds_lfht_iter iter; | |
74 | struct cds_lfht_node *node; | |
75 | struct rotation_channel_info *channel_info = NULL; | |
76 | struct rotation_channel_key channel_key = { .key = key, | |
77 | .domain = domain }; | |
78 | ||
79 | cds_lfht_lookup(channel_pending_rotate_ht, | |
80 | hash_channel_key(&channel_key), | |
81 | match_channel_info, | |
82 | &channel_key, &iter); | |
83 | node = cds_lfht_iter_get_node(&iter); | |
84 | if (!node) { | |
85 | goto end; | |
86 | } | |
87 | ||
88 | channel_info = caa_container_of(node, struct rotation_channel_info, | |
89 | rotate_channels_ht_node); | |
90 | cds_lfht_del(channel_pending_rotate_ht, node); | |
91 | end: | |
92 | return channel_info; | |
93 | } | |
94 | ||
95 | /* | |
96 | * Destroy the thread data previously created by the init function. | |
97 | */ | |
98 | void rotation_thread_handle_destroy( | |
99 | struct rotation_thread_handle *handle) | |
100 | { | |
101 | int ret; | |
102 | ||
103 | if (!handle) { | |
104 | goto end; | |
105 | } | |
106 | ||
107 | if (handle->ust32_consumer >= 0) { | |
108 | ret = close(handle->ust32_consumer); | |
109 | if (ret) { | |
110 | PERROR("close 32-bit consumer channel rotation pipe"); | |
111 | } | |
112 | } | |
113 | if (handle->ust64_consumer >= 0) { | |
114 | ret = close(handle->ust64_consumer); | |
115 | if (ret) { | |
116 | PERROR("close 64-bit consumer channel rotation pipe"); | |
117 | } | |
118 | } | |
119 | if (handle->kernel_consumer >= 0) { | |
120 | ret = close(handle->kernel_consumer); | |
121 | if (ret) { | |
122 | PERROR("close kernel consumer channel rotation pipe"); | |
123 | } | |
124 | } | |
125 | ||
126 | end: | |
127 | free(handle); | |
128 | } | |
129 | ||
130 | struct rotation_thread_handle *rotation_thread_handle_create( | |
131 | struct lttng_pipe *ust32_channel_rotate_pipe, | |
132 | struct lttng_pipe *ust64_channel_rotate_pipe, | |
133 | struct lttng_pipe *kernel_channel_rotate_pipe, | |
55c2a7f9 | 134 | int thread_quit_pipe, int rotate_timer_pipe) |
6e0be6cc JD |
135 | { |
136 | struct rotation_thread_handle *handle; | |
137 | ||
138 | handle = zmalloc(sizeof(*handle)); | |
139 | if (!handle) { | |
140 | goto end; | |
141 | } | |
142 | ||
143 | if (ust32_channel_rotate_pipe) { | |
144 | handle->ust32_consumer = | |
145 | lttng_pipe_release_readfd( | |
146 | ust32_channel_rotate_pipe); | |
147 | if (handle->ust32_consumer < 0) { | |
148 | goto error; | |
149 | } | |
150 | } else { | |
151 | handle->ust32_consumer = -1; | |
152 | } | |
153 | if (ust64_channel_rotate_pipe) { | |
154 | handle->ust64_consumer = | |
155 | lttng_pipe_release_readfd( | |
156 | ust64_channel_rotate_pipe); | |
157 | if (handle->ust64_consumer < 0) { | |
158 | goto error; | |
159 | } | |
160 | } else { | |
161 | handle->ust64_consumer = -1; | |
162 | } | |
163 | if (kernel_channel_rotate_pipe) { | |
164 | handle->kernel_consumer = | |
165 | lttng_pipe_release_readfd( | |
166 | kernel_channel_rotate_pipe); | |
167 | if (handle->kernel_consumer < 0) { | |
168 | goto error; | |
169 | } | |
170 | } else { | |
171 | handle->kernel_consumer = -1; | |
172 | } | |
173 | handle->thread_quit_pipe = thread_quit_pipe; | |
55c2a7f9 | 174 | handle->rotate_timer_pipe = rotate_timer_pipe; |
6e0be6cc JD |
175 | |
176 | end: | |
177 | return handle; | |
178 | error: | |
179 | rotation_thread_handle_destroy(handle); | |
180 | return NULL; | |
181 | } | |
182 | ||
183 | static | |
184 | int init_poll_set(struct lttng_poll_event *poll_set, | |
185 | struct rotation_thread_handle *handle) | |
186 | { | |
187 | int ret; | |
188 | ||
189 | /* | |
55c2a7f9 | 190 | * Create pollset with size 5: |
6e0be6cc JD |
191 | * - sessiond quit pipe |
192 | * - consumerd (32-bit user space) channel rotate pipe, | |
193 | * - consumerd (64-bit user space) channel rotate pipe, | |
194 | * - consumerd (kernel) channel rotate pipe. | |
55c2a7f9 | 195 | * - sessiond rotate pending pipe |
6e0be6cc | 196 | */ |
55c2a7f9 | 197 | ret = lttng_poll_create(poll_set, 5, LTTNG_CLOEXEC); |
6e0be6cc JD |
198 | if (ret < 0) { |
199 | goto end; | |
200 | } | |
201 | ||
202 | ret = lttng_poll_add(poll_set, handle->thread_quit_pipe, | |
203 | LPOLLIN | LPOLLERR); | |
204 | if (ret < 0) { | |
205 | ERR("[rotation-thread] Failed to add thread_quit_pipe fd to pollset"); | |
206 | goto error; | |
207 | } | |
55c2a7f9 JD |
208 | ret = lttng_poll_add(poll_set, handle->rotate_timer_pipe, |
209 | LPOLLIN | LPOLLERR); | |
210 | if (ret < 0) { | |
211 | ERR("[rotation-thread] Failed to add rotate_pending fd to pollset"); | |
212 | goto error; | |
213 | } | |
6e0be6cc JD |
214 | ret = lttng_poll_add(poll_set, handle->ust32_consumer, |
215 | LPOLLIN | LPOLLERR); | |
216 | if (ret < 0) { | |
217 | ERR("[rotation-thread] Failed to add ust-32 channel rotation pipe fd to pollset"); | |
218 | goto error; | |
219 | } | |
220 | ret = lttng_poll_add(poll_set, handle->ust64_consumer, | |
221 | LPOLLIN | LPOLLERR); | |
222 | if (ret < 0) { | |
223 | ERR("[rotation-thread] Failed to add ust-64 channel rotation pipe fd to pollset"); | |
224 | goto error; | |
225 | } | |
226 | if (handle->kernel_consumer < 0) { | |
227 | goto end; | |
228 | } | |
229 | ret = lttng_poll_add(poll_set, handle->kernel_consumer, | |
230 | LPOLLIN | LPOLLERR); | |
231 | if (ret < 0) { | |
232 | ERR("[rotation-thread] Failed to add kernel channel rotation pipe fd to pollset"); | |
233 | goto error; | |
234 | } | |
235 | ||
236 | end: | |
237 | return ret; | |
238 | error: | |
239 | lttng_poll_clean(poll_set); | |
240 | return ret; | |
241 | } | |
242 | ||
243 | static | |
244 | void fini_thread_state(struct rotation_thread_state *state) | |
245 | { | |
246 | lttng_poll_clean(&state->events); | |
247 | } | |
248 | ||
249 | static | |
250 | int init_thread_state(struct rotation_thread_handle *handle, | |
251 | struct rotation_thread_state *state) | |
252 | { | |
253 | int ret; | |
254 | ||
255 | memset(state, 0, sizeof(*state)); | |
256 | lttng_poll_init(&state->events); | |
257 | ||
258 | ret = init_poll_set(&state->events, handle); | |
259 | if (ret) { | |
260 | goto end; | |
261 | } | |
262 | ||
263 | channel_pending_rotate_ht = cds_lfht_new(DEFAULT_HT_SIZE, | |
264 | 1, 0, CDS_LFHT_AUTO_RESIZE | CDS_LFHT_ACCOUNTING, NULL); | |
265 | if (!channel_pending_rotate_ht) { | |
266 | ret = -1; | |
267 | } | |
268 | ||
269 | end: | |
270 | return 0; | |
271 | } | |
272 | ||
6e0be6cc JD |
273 | static |
274 | int handle_channel_rotation_pipe(int fd, uint32_t revents, | |
275 | struct rotation_thread_handle *handle, | |
276 | struct rotation_thread_state *state) | |
277 | { | |
278 | int ret = 0; | |
279 | enum lttng_domain_type domain; | |
280 | struct rotation_channel_info *channel_info; | |
69cda452 | 281 | struct ltt_session *session = NULL; |
6e0be6cc JD |
282 | uint64_t key; |
283 | ||
284 | if (fd == handle->ust32_consumer || | |
285 | fd == handle->ust64_consumer) { | |
286 | domain = LTTNG_DOMAIN_UST; | |
287 | } else if (fd == handle->kernel_consumer) { | |
288 | domain = LTTNG_DOMAIN_KERNEL; | |
289 | } else { | |
290 | abort(); | |
291 | } | |
292 | ||
293 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
294 | ret = lttng_poll_del(&state->events, fd); | |
295 | if (ret) { | |
103373d7 JD |
296 | ERR("[rotation-thread] Failed to remove consumer " |
297 | "rotation pipe from poll set"); | |
6e0be6cc JD |
298 | } |
299 | goto end; | |
300 | } | |
301 | ||
302 | do { | |
303 | ret = read(fd, &key, sizeof(key)); | |
304 | } while (ret == -1 && errno == EINTR); | |
305 | if (ret != sizeof(key)) { | |
306 | ERR("[rotation-thread] Failed to read from pipe (fd = %i)", | |
307 | fd); | |
308 | ret = -1; | |
309 | goto end; | |
310 | } | |
311 | ||
312 | DBG("[rotation-thread] Received notification for chan %" PRIu64 | |
313 | ", domain %d\n", key, domain); | |
314 | ||
315 | channel_info = lookup_channel_pending(key, domain); | |
316 | if (!channel_info) { | |
317 | ERR("[rotation-thread] Failed to find channel_info (key = %" | |
318 | PRIu64 ")", key); | |
319 | ret = -1; | |
320 | goto end; | |
321 | } | |
69cda452 JD |
322 | rcu_read_lock(); |
323 | session_lock_list(); | |
324 | session = session_find_by_id(channel_info->session_id); | |
325 | if (!session) { | |
326 | ERR("[rotation-thread] Session %" PRIu64 " not found", | |
327 | channel_info->session_id); | |
328 | ret = -1; | |
329 | goto end_unlock; | |
330 | } | |
6e0be6cc | 331 | |
69cda452 | 332 | if (--session->nr_chan_rotate_pending == 0) { |
6e0be6cc JD |
333 | time_t now = time(NULL); |
334 | ||
335 | if (now == (time_t) -1) { | |
69cda452 | 336 | session->rotate_status = LTTNG_ROTATE_ERROR; |
6e0be6cc JD |
337 | ret = LTTNG_ERR_ROTATE_NOT_AVAILABLE; |
338 | goto end; | |
339 | } | |
69cda452 | 340 | session_lock(session); |
6e0be6cc | 341 | |
69cda452 | 342 | ret = rename_complete_chunk(session, now); |
6e0be6cc JD |
343 | if (ret < 0) { |
344 | ERR("Failed to rename completed rotation chunk"); | |
69cda452 | 345 | session_unlock(session); |
6e0be6cc JD |
346 | goto end; |
347 | } | |
69cda452 JD |
348 | session->rotate_pending = false; |
349 | if (session->rotate_pending_relay) { | |
0d2ff20e | 350 | ret = sessiond_timer_rotate_pending_start( |
69cda452 | 351 | session, |
1b58b7f5 | 352 | DEFAULT_ROTATE_PENDING_RELAY_TIMER); |
0d2ff20e JD |
353 | if (ret) { |
354 | ERR("Enabling rotate pending timer"); | |
355 | ret = -1; | |
69cda452 | 356 | session_unlock(session); |
0d2ff20e JD |
357 | goto end; |
358 | } | |
359 | } | |
69cda452 | 360 | session_unlock(session); |
6e0be6cc JD |
361 | } |
362 | ||
363 | channel_rotation_info_destroy(channel_info); | |
364 | ||
365 | ret = 0; | |
366 | ||
69cda452 JD |
367 | end_unlock: |
368 | session_unlock_list(); | |
369 | rcu_read_unlock(); | |
6e0be6cc JD |
370 | end: |
371 | return ret; | |
372 | } | |
373 | ||
06e13874 JD |
374 | static |
375 | int rotate_pending_relay_timer(struct ltt_session *session) | |
376 | { | |
377 | int ret; | |
378 | ||
379 | DBG("[rotation-thread] Check rotate pending on session %" PRIu64, | |
380 | session->id); | |
381 | ret = relay_rotate_pending(session, session->rotate_count - 1); | |
382 | if (ret < 0) { | |
383 | ERR("[rotation-thread] Check relay rotate pending"); | |
384 | goto end; | |
385 | } | |
386 | if (ret == 0) { | |
387 | DBG("[rotation-thread] Rotation completed on the relay for " | |
388 | "session %" PRIu64, session->id); | |
389 | /* | |
390 | * Stop the timer and clear the queue, the timers are currently | |
391 | * ignored because of the rotate_pending_relay_check_in_progress | |
392 | * flag. | |
393 | */ | |
394 | sessiond_timer_rotate_pending_stop(session); | |
395 | /* | |
396 | * Now we can clear the pending flag in the session. New | |
397 | * rotations can start now. | |
398 | */ | |
399 | session->rotate_pending_relay = false; | |
400 | } else if (ret == 1) { | |
401 | DBG("[rotation-thread] Rotation still pending on the relay for " | |
402 | "session %" PRIu64, session->id); | |
403 | } | |
404 | /* | |
405 | * Allow the timer thread to send other notifications when needed. | |
406 | */ | |
407 | session->rotate_pending_relay_check_in_progress = false; | |
06e13874 JD |
408 | |
409 | ret = 0; | |
410 | ||
411 | end: | |
412 | return ret; | |
413 | } | |
414 | ||
415 | static | |
416 | int rotate_timer(struct ltt_session *session) | |
417 | { | |
418 | int ret; | |
419 | ||
420 | DBG("[rotation-thread] Rotate timer on session %" PRIu64, session->id); | |
8cf2762e JD |
421 | |
422 | /* | |
423 | * If the session is stopped, we need to cancel this timer. | |
424 | */ | |
90097149 | 425 | session_lock(session); |
8cf2762e JD |
426 | if (!session->active && session->rotate_timer_enabled) { |
427 | sessiond_rotate_timer_stop(session); | |
428 | } | |
8cf2762e | 429 | |
06e13874 | 430 | ret = cmd_rotate_session(session, NULL); |
90097149 | 431 | session_unlock(session); |
8cf2762e JD |
432 | if (ret == -LTTNG_ERR_ROTATE_PENDING) { |
433 | ret = 0; | |
434 | goto end; | |
435 | } else if (ret != LTTNG_OK) { | |
436 | ret = -1; | |
437 | goto end; | |
438 | } | |
439 | ||
06e13874 | 440 | |
8cf2762e JD |
441 | ret = 0; |
442 | ||
443 | end: | |
06e13874 JD |
444 | return ret; |
445 | } | |
446 | ||
55c2a7f9 JD |
447 | static |
448 | int handle_rotate_timer_pipe(int fd, uint32_t revents, | |
449 | struct rotation_thread_handle *handle, | |
450 | struct rotation_thread_state *state) | |
451 | { | |
452 | int ret = 0; | |
55c2a7f9 | 453 | struct ltt_session *session; |
06e13874 | 454 | struct sessiond_rotation_timer timer_data; |
55c2a7f9 JD |
455 | |
456 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
457 | ret = lttng_poll_del(&state->events, fd); | |
458 | if (ret) { | |
459 | ERR("[rotation-thread] Failed to remove consumer " | |
460 | "rotate pending pipe from poll set"); | |
461 | } | |
462 | goto end; | |
463 | } | |
464 | ||
06e13874 JD |
465 | memset(&timer_data, 0, sizeof(struct sessiond_rotation_timer)); |
466 | ||
55c2a7f9 | 467 | do { |
06e13874 | 468 | ret = read(fd, &timer_data, sizeof(timer_data)); |
55c2a7f9 | 469 | } while (ret == -1 && errno == EINTR); |
06e13874 | 470 | if (ret != sizeof(timer_data)) { |
55c2a7f9 JD |
471 | ERR("[rotation-thread] Failed to read from pipe (fd = %i)", |
472 | fd); | |
473 | ret = -1; | |
474 | goto end; | |
475 | } | |
476 | ||
90097149 JD |
477 | rcu_read_lock(); |
478 | session_lock_list(); | |
06e13874 | 479 | session = session_find_by_id(timer_data.session_id); |
55c2a7f9 JD |
480 | if (!session) { |
481 | ERR("[rotation-thread] Session %" PRIu64 " not found", | |
06e13874 | 482 | timer_data.session_id); |
000cee43 JD |
483 | /* |
484 | * This is a non-fatal error, and we cannot report it to the | |
485 | * user (timer), so just print the error and continue the | |
486 | * processing. | |
487 | */ | |
488 | ret = 0; | |
90097149 | 489 | goto end_unlock; |
55c2a7f9 JD |
490 | } |
491 | ||
06e13874 JD |
492 | if (timer_data.signal == LTTNG_SESSIOND_SIG_ROTATE_PENDING) { |
493 | ret = rotate_pending_relay_timer(session); | |
494 | } else if (timer_data.signal == LTTNG_SESSIOND_SIG_ROTATE_TIMER) { | |
495 | ret = rotate_timer(session); | |
496 | } else { | |
497 | ERR("Unknown signal in rotate timer"); | |
498 | ret = -1; | |
55c2a7f9 | 499 | } |
55c2a7f9 | 500 | |
90097149 JD |
501 | end_unlock: |
502 | session_unlock_list(); | |
503 | rcu_read_unlock(); | |
55c2a7f9 JD |
504 | end: |
505 | return ret; | |
506 | } | |
507 | ||
6e0be6cc JD |
508 | void *thread_rotation(void *data) |
509 | { | |
510 | int ret; | |
511 | struct rotation_thread_handle *handle = data; | |
512 | struct rotation_thread_state state; | |
513 | ||
514 | DBG("[rotation-thread] Started rotation thread"); | |
515 | ||
516 | if (!handle) { | |
517 | ERR("[rotation-thread] Invalid thread context provided"); | |
518 | goto end; | |
519 | } | |
520 | ||
521 | rcu_register_thread(); | |
522 | rcu_thread_online(); | |
523 | ||
524 | health_register(health_sessiond, HEALTH_SESSIOND_TYPE_ROTATION); | |
525 | health_code_update(); | |
526 | ||
527 | ret = init_thread_state(handle, &state); | |
528 | if (ret) { | |
529 | goto end; | |
530 | } | |
531 | ||
532 | /* Ready to handle client connections. */ | |
533 | sessiond_notify_ready(); | |
534 | ||
535 | while (true) { | |
536 | int fd_count, i; | |
537 | ||
538 | health_poll_entry(); | |
539 | DBG("[rotation-thread] Entering poll wait"); | |
540 | ret = lttng_poll_wait(&state.events, -1); | |
541 | DBG("[rotation-thread] Poll wait returned (%i)", ret); | |
542 | health_poll_exit(); | |
543 | if (ret < 0) { | |
544 | /* | |
545 | * Restart interrupted system call. | |
546 | */ | |
547 | if (errno == EINTR) { | |
548 | continue; | |
549 | } | |
550 | ERR("[rotation-thread] Error encountered during lttng_poll_wait (%i)", ret); | |
551 | goto error; | |
552 | } | |
553 | ||
554 | fd_count = ret; | |
555 | for (i = 0; i < fd_count; i++) { | |
556 | int fd = LTTNG_POLL_GETFD(&state.events, i); | |
557 | uint32_t revents = LTTNG_POLL_GETEV(&state.events, i); | |
558 | ||
559 | DBG("[rotation-thread] Handling fd (%i) activity (%u)", | |
560 | fd, revents); | |
561 | ||
562 | if (fd == handle->thread_quit_pipe) { | |
563 | DBG("[rotation-thread] Quit pipe activity"); | |
564 | goto exit; | |
55c2a7f9 JD |
565 | } else if (fd == handle->rotate_timer_pipe) { |
566 | ret = handle_rotate_timer_pipe(fd, revents, | |
567 | handle, &state); | |
568 | if (ret) { | |
06e13874 | 569 | ERR("[rotation-thread] Rotate timer"); |
55c2a7f9 JD |
570 | goto error; |
571 | } | |
6e0be6cc JD |
572 | } else if (fd == handle->ust32_consumer || |
573 | fd == handle->ust64_consumer || | |
574 | fd == handle->kernel_consumer) { | |
575 | ret = handle_channel_rotation_pipe(fd, | |
576 | revents, handle, &state); | |
577 | if (ret) { | |
578 | ERR("[rotation-thread] Exit main loop"); | |
579 | goto error; | |
580 | } | |
581 | } | |
582 | } | |
583 | } | |
584 | exit: | |
585 | error: | |
586 | fini_thread_state(&state); | |
587 | health_unregister(health_sessiond); | |
588 | rcu_thread_offline(); | |
589 | rcu_unregister_thread(); | |
590 | end: | |
591 | return NULL; | |
592 | } |