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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" | |
38 | #include "cmd.h" | |
39 | ||
40 | #include <urcu.h> | |
41 | #include <urcu/list.h> | |
42 | #include <urcu/rculfhash.h> | |
43 | ||
44 | struct cds_lfht *channel_pending_rotate_ht; | |
45 | ||
46 | static | |
47 | unsigned long hash_channel_key(struct rotation_channel_key *key) | |
48 | { | |
49 | return hash_key_u64(&key->key, lttng_ht_seed) ^ hash_key_ulong( | |
50 | (void *) (unsigned long) key->domain, lttng_ht_seed); | |
51 | } | |
52 | ||
53 | static | |
54 | void channel_rotation_info_destroy(struct rotation_channel_info *channel_info) | |
55 | { | |
56 | assert(channel_info); | |
57 | free(channel_info); | |
58 | } | |
59 | ||
60 | int rotate_add_channel_pending(uint64_t key, enum lttng_domain_type domain, | |
61 | struct ltt_session *session) | |
62 | { | |
63 | int ret; | |
64 | struct rotation_channel_info *new_info; | |
65 | struct rotation_channel_key channel_key = { .key = key, | |
66 | .domain = domain }; | |
67 | ||
68 | new_info = zmalloc(sizeof(struct rotation_channel_info)); | |
69 | if (!new_info) { | |
70 | goto error; | |
71 | } | |
72 | ||
73 | new_info->channel_key.key = key; | |
74 | new_info->channel_key.domain = domain; | |
75 | new_info->session = session; | |
76 | cds_lfht_node_init(&new_info->rotate_channels_ht_node); | |
77 | ||
78 | session->nr_chan_rotate_pending++; | |
79 | cds_lfht_add(channel_pending_rotate_ht, | |
80 | hash_channel_key(&channel_key), | |
81 | &new_info->rotate_channels_ht_node); | |
82 | ||
83 | ret = 0; | |
84 | goto end; | |
85 | ||
86 | error: | |
87 | ret = -1; | |
88 | end: | |
89 | return ret; | |
90 | } | |
91 | ||
92 | static | |
93 | int match_channel_info(struct cds_lfht_node *node, const void *key) | |
94 | { | |
95 | struct rotation_channel_key *channel_key = (struct rotation_channel_key *) key; | |
96 | struct rotation_channel_info *channel_info; | |
97 | ||
98 | channel_info = caa_container_of(node, struct rotation_channel_info, | |
99 | rotate_channels_ht_node); | |
100 | ||
101 | return !!((channel_key->key == channel_info->channel_key.key) && | |
102 | (channel_key->domain == channel_info->channel_key.domain)); | |
103 | } | |
104 | ||
105 | static | |
106 | struct rotation_channel_info *lookup_channel_pending(uint64_t key, | |
107 | enum lttng_domain_type domain) | |
108 | { | |
109 | struct cds_lfht_iter iter; | |
110 | struct cds_lfht_node *node; | |
111 | struct rotation_channel_info *channel_info = NULL; | |
112 | struct rotation_channel_key channel_key = { .key = key, | |
113 | .domain = domain }; | |
114 | ||
115 | cds_lfht_lookup(channel_pending_rotate_ht, | |
116 | hash_channel_key(&channel_key), | |
117 | match_channel_info, | |
118 | &channel_key, &iter); | |
119 | node = cds_lfht_iter_get_node(&iter); | |
120 | if (!node) { | |
121 | goto end; | |
122 | } | |
123 | ||
124 | channel_info = caa_container_of(node, struct rotation_channel_info, | |
125 | rotate_channels_ht_node); | |
126 | cds_lfht_del(channel_pending_rotate_ht, node); | |
127 | end: | |
128 | return channel_info; | |
129 | } | |
130 | ||
131 | /* | |
132 | * Destroy the thread data previously created by the init function. | |
133 | */ | |
134 | void rotation_thread_handle_destroy( | |
135 | struct rotation_thread_handle *handle) | |
136 | { | |
137 | int ret; | |
138 | ||
139 | if (!handle) { | |
140 | goto end; | |
141 | } | |
142 | ||
143 | if (handle->ust32_consumer >= 0) { | |
144 | ret = close(handle->ust32_consumer); | |
145 | if (ret) { | |
146 | PERROR("close 32-bit consumer channel rotation pipe"); | |
147 | } | |
148 | } | |
149 | if (handle->ust64_consumer >= 0) { | |
150 | ret = close(handle->ust64_consumer); | |
151 | if (ret) { | |
152 | PERROR("close 64-bit consumer channel rotation pipe"); | |
153 | } | |
154 | } | |
155 | if (handle->kernel_consumer >= 0) { | |
156 | ret = close(handle->kernel_consumer); | |
157 | if (ret) { | |
158 | PERROR("close kernel consumer channel rotation pipe"); | |
159 | } | |
160 | } | |
161 | ||
162 | end: | |
163 | free(handle); | |
164 | } | |
165 | ||
166 | struct rotation_thread_handle *rotation_thread_handle_create( | |
167 | struct lttng_pipe *ust32_channel_rotate_pipe, | |
168 | struct lttng_pipe *ust64_channel_rotate_pipe, | |
169 | struct lttng_pipe *kernel_channel_rotate_pipe, | |
170 | int thread_quit_pipe) | |
171 | { | |
172 | struct rotation_thread_handle *handle; | |
173 | ||
174 | handle = zmalloc(sizeof(*handle)); | |
175 | if (!handle) { | |
176 | goto end; | |
177 | } | |
178 | ||
179 | if (ust32_channel_rotate_pipe) { | |
180 | handle->ust32_consumer = | |
181 | lttng_pipe_release_readfd( | |
182 | ust32_channel_rotate_pipe); | |
183 | if (handle->ust32_consumer < 0) { | |
184 | goto error; | |
185 | } | |
186 | } else { | |
187 | handle->ust32_consumer = -1; | |
188 | } | |
189 | if (ust64_channel_rotate_pipe) { | |
190 | handle->ust64_consumer = | |
191 | lttng_pipe_release_readfd( | |
192 | ust64_channel_rotate_pipe); | |
193 | if (handle->ust64_consumer < 0) { | |
194 | goto error; | |
195 | } | |
196 | } else { | |
197 | handle->ust64_consumer = -1; | |
198 | } | |
199 | if (kernel_channel_rotate_pipe) { | |
200 | handle->kernel_consumer = | |
201 | lttng_pipe_release_readfd( | |
202 | kernel_channel_rotate_pipe); | |
203 | if (handle->kernel_consumer < 0) { | |
204 | goto error; | |
205 | } | |
206 | } else { | |
207 | handle->kernel_consumer = -1; | |
208 | } | |
209 | handle->thread_quit_pipe = thread_quit_pipe; | |
210 | ||
211 | end: | |
212 | return handle; | |
213 | error: | |
214 | rotation_thread_handle_destroy(handle); | |
215 | return NULL; | |
216 | } | |
217 | ||
218 | static | |
219 | int init_poll_set(struct lttng_poll_event *poll_set, | |
220 | struct rotation_thread_handle *handle) | |
221 | { | |
222 | int ret; | |
223 | ||
224 | /* | |
225 | * Create pollset with size 4: | |
226 | * - sessiond quit pipe | |
227 | * - consumerd (32-bit user space) channel rotate pipe, | |
228 | * - consumerd (64-bit user space) channel rotate pipe, | |
229 | * - consumerd (kernel) channel rotate pipe. | |
230 | */ | |
231 | ret = lttng_poll_create(poll_set, 4, LTTNG_CLOEXEC); | |
232 | if (ret < 0) { | |
233 | goto end; | |
234 | } | |
235 | ||
236 | ret = lttng_poll_add(poll_set, handle->thread_quit_pipe, | |
237 | LPOLLIN | LPOLLERR); | |
238 | if (ret < 0) { | |
239 | ERR("[rotation-thread] Failed to add thread_quit_pipe fd to pollset"); | |
240 | goto error; | |
241 | } | |
242 | ret = lttng_poll_add(poll_set, handle->ust32_consumer, | |
243 | LPOLLIN | LPOLLERR); | |
244 | if (ret < 0) { | |
245 | ERR("[rotation-thread] Failed to add ust-32 channel rotation pipe fd to pollset"); | |
246 | goto error; | |
247 | } | |
248 | ret = lttng_poll_add(poll_set, handle->ust64_consumer, | |
249 | LPOLLIN | LPOLLERR); | |
250 | if (ret < 0) { | |
251 | ERR("[rotation-thread] Failed to add ust-64 channel rotation pipe fd to pollset"); | |
252 | goto error; | |
253 | } | |
254 | if (handle->kernel_consumer < 0) { | |
255 | goto end; | |
256 | } | |
257 | ret = lttng_poll_add(poll_set, handle->kernel_consumer, | |
258 | LPOLLIN | LPOLLERR); | |
259 | if (ret < 0) { | |
260 | ERR("[rotation-thread] Failed to add kernel channel rotation pipe fd to pollset"); | |
261 | goto error; | |
262 | } | |
263 | ||
264 | end: | |
265 | return ret; | |
266 | error: | |
267 | lttng_poll_clean(poll_set); | |
268 | return ret; | |
269 | } | |
270 | ||
271 | static | |
272 | void fini_thread_state(struct rotation_thread_state *state) | |
273 | { | |
274 | lttng_poll_clean(&state->events); | |
275 | } | |
276 | ||
277 | static | |
278 | int init_thread_state(struct rotation_thread_handle *handle, | |
279 | struct rotation_thread_state *state) | |
280 | { | |
281 | int ret; | |
282 | ||
283 | memset(state, 0, sizeof(*state)); | |
284 | lttng_poll_init(&state->events); | |
285 | ||
286 | ret = init_poll_set(&state->events, handle); | |
287 | if (ret) { | |
288 | goto end; | |
289 | } | |
290 | ||
291 | channel_pending_rotate_ht = cds_lfht_new(DEFAULT_HT_SIZE, | |
292 | 1, 0, CDS_LFHT_AUTO_RESIZE | CDS_LFHT_ACCOUNTING, NULL); | |
293 | if (!channel_pending_rotate_ht) { | |
294 | ret = -1; | |
295 | } | |
296 | ||
297 | end: | |
298 | return 0; | |
299 | } | |
300 | ||
301 | int rename_complete_chunk(struct ltt_session *session, time_t ts) | |
302 | { | |
303 | struct tm *timeinfo; | |
304 | char datetime[16]; | |
305 | char *tmppath = NULL; | |
306 | int ret; | |
307 | ||
308 | timeinfo = localtime(&ts); | |
309 | strftime(datetime, sizeof(datetime), "%Y%m%d-%H%M%S", timeinfo); | |
310 | ||
311 | tmppath = zmalloc(PATH_MAX * sizeof(char)); | |
312 | if (!tmppath) { | |
313 | ERR("Alloc tmppath"); | |
314 | ret = -1; | |
315 | goto end; | |
316 | } | |
317 | ||
318 | snprintf(tmppath, PATH_MAX, "%s%s-%" PRIu64, | |
319 | session->rotation_chunk.current_rotate_path, | |
320 | datetime, session->rotate_count); | |
321 | ||
322 | fprintf(stderr, "rename %s to %s\n", session->rotation_chunk.current_rotate_path, | |
323 | tmppath); | |
324 | ret = rename(session->rotation_chunk.current_rotate_path, | |
325 | tmppath); | |
326 | if (ret < 0) { | |
327 | PERROR("Rename completed rotation chunk"); | |
328 | goto end; | |
329 | } | |
330 | /* | |
331 | * Store the path where the readable chunk is. This path is valid | |
332 | * and can be queried by the client with rotate_pending until the next | |
333 | * rotation is started. | |
334 | */ | |
335 | snprintf(session->rotation_chunk.current_rotate_path, PATH_MAX, | |
336 | "%s", tmppath); | |
337 | session->rotate_pending = 0; | |
338 | ||
339 | end: | |
340 | free(tmppath); | |
341 | return ret; | |
342 | } | |
343 | ||
344 | static | |
345 | int handle_channel_rotation_pipe(int fd, uint32_t revents, | |
346 | struct rotation_thread_handle *handle, | |
347 | struct rotation_thread_state *state) | |
348 | { | |
349 | int ret = 0; | |
350 | enum lttng_domain_type domain; | |
351 | struct rotation_channel_info *channel_info; | |
352 | uint64_t key; | |
353 | ||
354 | if (fd == handle->ust32_consumer || | |
355 | fd == handle->ust64_consumer) { | |
356 | domain = LTTNG_DOMAIN_UST; | |
357 | } else if (fd == handle->kernel_consumer) { | |
358 | domain = LTTNG_DOMAIN_KERNEL; | |
359 | } else { | |
360 | abort(); | |
361 | } | |
362 | ||
363 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
364 | ret = lttng_poll_del(&state->events, fd); | |
365 | if (ret) { | |
366 | ERR("[rotation-thread] Failed to remove consumer rotation pipe from poll set"); | |
367 | } | |
368 | goto end; | |
369 | } | |
370 | ||
371 | do { | |
372 | ret = read(fd, &key, sizeof(key)); | |
373 | } while (ret == -1 && errno == EINTR); | |
374 | if (ret != sizeof(key)) { | |
375 | ERR("[rotation-thread] Failed to read from pipe (fd = %i)", | |
376 | fd); | |
377 | ret = -1; | |
378 | goto end; | |
379 | } | |
380 | ||
381 | DBG("[rotation-thread] Received notification for chan %" PRIu64 | |
382 | ", domain %d\n", key, domain); | |
383 | ||
384 | channel_info = lookup_channel_pending(key, domain); | |
385 | if (!channel_info) { | |
386 | ERR("[rotation-thread] Failed to find channel_info (key = %" | |
387 | PRIu64 ")", key); | |
388 | ret = -1; | |
389 | goto end; | |
390 | } | |
391 | ||
392 | if (--channel_info->session->nr_chan_rotate_pending == 0) { | |
393 | time_t now = time(NULL); | |
394 | ||
395 | if (now == (time_t) -1) { | |
396 | ret = LTTNG_ERR_ROTATE_NOT_AVAILABLE; | |
397 | goto end; | |
398 | } | |
399 | ||
400 | ret = rename_complete_chunk(channel_info->session, now); | |
401 | if (ret < 0) { | |
402 | ERR("Failed to rename completed rotation chunk"); | |
403 | goto end; | |
404 | } | |
405 | } | |
406 | ||
407 | channel_rotation_info_destroy(channel_info); | |
408 | ||
409 | ret = 0; | |
410 | ||
411 | end: | |
412 | return ret; | |
413 | } | |
414 | ||
415 | void *thread_rotation(void *data) | |
416 | { | |
417 | int ret; | |
418 | struct rotation_thread_handle *handle = data; | |
419 | struct rotation_thread_state state; | |
420 | ||
421 | DBG("[rotation-thread] Started rotation thread"); | |
422 | ||
423 | if (!handle) { | |
424 | ERR("[rotation-thread] Invalid thread context provided"); | |
425 | goto end; | |
426 | } | |
427 | ||
428 | rcu_register_thread(); | |
429 | rcu_thread_online(); | |
430 | ||
431 | health_register(health_sessiond, HEALTH_SESSIOND_TYPE_ROTATION); | |
432 | health_code_update(); | |
433 | ||
434 | ret = init_thread_state(handle, &state); | |
435 | if (ret) { | |
436 | goto end; | |
437 | } | |
438 | ||
439 | /* Ready to handle client connections. */ | |
440 | sessiond_notify_ready(); | |
441 | ||
442 | while (true) { | |
443 | int fd_count, i; | |
444 | ||
445 | health_poll_entry(); | |
446 | DBG("[rotation-thread] Entering poll wait"); | |
447 | ret = lttng_poll_wait(&state.events, -1); | |
448 | DBG("[rotation-thread] Poll wait returned (%i)", ret); | |
449 | health_poll_exit(); | |
450 | if (ret < 0) { | |
451 | /* | |
452 | * Restart interrupted system call. | |
453 | */ | |
454 | if (errno == EINTR) { | |
455 | continue; | |
456 | } | |
457 | ERR("[rotation-thread] Error encountered during lttng_poll_wait (%i)", ret); | |
458 | goto error; | |
459 | } | |
460 | ||
461 | fd_count = ret; | |
462 | for (i = 0; i < fd_count; i++) { | |
463 | int fd = LTTNG_POLL_GETFD(&state.events, i); | |
464 | uint32_t revents = LTTNG_POLL_GETEV(&state.events, i); | |
465 | ||
466 | DBG("[rotation-thread] Handling fd (%i) activity (%u)", | |
467 | fd, revents); | |
468 | ||
469 | if (fd == handle->thread_quit_pipe) { | |
470 | DBG("[rotation-thread] Quit pipe activity"); | |
471 | goto exit; | |
472 | } else if (fd == handle->ust32_consumer || | |
473 | fd == handle->ust64_consumer || | |
474 | fd == handle->kernel_consumer) { | |
475 | ret = handle_channel_rotation_pipe(fd, | |
476 | revents, handle, &state); | |
477 | if (ret) { | |
478 | ERR("[rotation-thread] Exit main loop"); | |
479 | goto error; | |
480 | } | |
481 | } | |
482 | } | |
483 | } | |
484 | exit: | |
485 | error: | |
486 | fini_thread_state(&state); | |
487 | health_unregister(health_sessiond); | |
488 | rcu_thread_offline(); | |
489 | rcu_unregister_thread(); | |
490 | end: | |
491 | return NULL; | |
492 | } |