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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 JD |
39 | #include "cmd.h" |
40 | ||
41 | #include <urcu.h> | |
42 | #include <urcu/list.h> | |
43 | #include <urcu/rculfhash.h> | |
44 | ||
45 | struct cds_lfht *channel_pending_rotate_ht; | |
46 | ||
6e0be6cc JD |
47 | static |
48 | void channel_rotation_info_destroy(struct rotation_channel_info *channel_info) | |
49 | { | |
50 | assert(channel_info); | |
51 | free(channel_info); | |
52 | } | |
53 | ||
6e0be6cc JD |
54 | static |
55 | int match_channel_info(struct cds_lfht_node *node, const void *key) | |
56 | { | |
57 | struct rotation_channel_key *channel_key = (struct rotation_channel_key *) key; | |
58 | struct rotation_channel_info *channel_info; | |
59 | ||
60 | channel_info = caa_container_of(node, struct rotation_channel_info, | |
61 | rotate_channels_ht_node); | |
62 | ||
63 | return !!((channel_key->key == channel_info->channel_key.key) && | |
64 | (channel_key->domain == channel_info->channel_key.domain)); | |
65 | } | |
66 | ||
67 | static | |
68 | struct rotation_channel_info *lookup_channel_pending(uint64_t key, | |
69 | enum lttng_domain_type domain) | |
70 | { | |
71 | struct cds_lfht_iter iter; | |
72 | struct cds_lfht_node *node; | |
73 | struct rotation_channel_info *channel_info = NULL; | |
74 | struct rotation_channel_key channel_key = { .key = key, | |
75 | .domain = domain }; | |
76 | ||
77 | cds_lfht_lookup(channel_pending_rotate_ht, | |
78 | hash_channel_key(&channel_key), | |
79 | match_channel_info, | |
80 | &channel_key, &iter); | |
81 | node = cds_lfht_iter_get_node(&iter); | |
82 | if (!node) { | |
83 | goto end; | |
84 | } | |
85 | ||
86 | channel_info = caa_container_of(node, struct rotation_channel_info, | |
87 | rotate_channels_ht_node); | |
88 | cds_lfht_del(channel_pending_rotate_ht, node); | |
89 | end: | |
90 | return channel_info; | |
91 | } | |
92 | ||
93 | /* | |
94 | * Destroy the thread data previously created by the init function. | |
95 | */ | |
96 | void rotation_thread_handle_destroy( | |
97 | struct rotation_thread_handle *handle) | |
98 | { | |
99 | int ret; | |
100 | ||
101 | if (!handle) { | |
102 | goto end; | |
103 | } | |
104 | ||
105 | if (handle->ust32_consumer >= 0) { | |
106 | ret = close(handle->ust32_consumer); | |
107 | if (ret) { | |
108 | PERROR("close 32-bit consumer channel rotation pipe"); | |
109 | } | |
110 | } | |
111 | if (handle->ust64_consumer >= 0) { | |
112 | ret = close(handle->ust64_consumer); | |
113 | if (ret) { | |
114 | PERROR("close 64-bit consumer channel rotation pipe"); | |
115 | } | |
116 | } | |
117 | if (handle->kernel_consumer >= 0) { | |
118 | ret = close(handle->kernel_consumer); | |
119 | if (ret) { | |
120 | PERROR("close kernel consumer channel rotation pipe"); | |
121 | } | |
122 | } | |
123 | ||
124 | end: | |
125 | free(handle); | |
126 | } | |
127 | ||
128 | struct rotation_thread_handle *rotation_thread_handle_create( | |
129 | struct lttng_pipe *ust32_channel_rotate_pipe, | |
130 | struct lttng_pipe *ust64_channel_rotate_pipe, | |
131 | struct lttng_pipe *kernel_channel_rotate_pipe, | |
132 | int thread_quit_pipe) | |
133 | { | |
134 | struct rotation_thread_handle *handle; | |
135 | ||
136 | handle = zmalloc(sizeof(*handle)); | |
137 | if (!handle) { | |
138 | goto end; | |
139 | } | |
140 | ||
141 | if (ust32_channel_rotate_pipe) { | |
142 | handle->ust32_consumer = | |
143 | lttng_pipe_release_readfd( | |
144 | ust32_channel_rotate_pipe); | |
145 | if (handle->ust32_consumer < 0) { | |
146 | goto error; | |
147 | } | |
148 | } else { | |
149 | handle->ust32_consumer = -1; | |
150 | } | |
151 | if (ust64_channel_rotate_pipe) { | |
152 | handle->ust64_consumer = | |
153 | lttng_pipe_release_readfd( | |
154 | ust64_channel_rotate_pipe); | |
155 | if (handle->ust64_consumer < 0) { | |
156 | goto error; | |
157 | } | |
158 | } else { | |
159 | handle->ust64_consumer = -1; | |
160 | } | |
161 | if (kernel_channel_rotate_pipe) { | |
162 | handle->kernel_consumer = | |
163 | lttng_pipe_release_readfd( | |
164 | kernel_channel_rotate_pipe); | |
165 | if (handle->kernel_consumer < 0) { | |
166 | goto error; | |
167 | } | |
168 | } else { | |
169 | handle->kernel_consumer = -1; | |
170 | } | |
171 | handle->thread_quit_pipe = thread_quit_pipe; | |
172 | ||
173 | end: | |
174 | return handle; | |
175 | error: | |
176 | rotation_thread_handle_destroy(handle); | |
177 | return NULL; | |
178 | } | |
179 | ||
180 | static | |
181 | int init_poll_set(struct lttng_poll_event *poll_set, | |
182 | struct rotation_thread_handle *handle) | |
183 | { | |
184 | int ret; | |
185 | ||
186 | /* | |
187 | * Create pollset with size 4: | |
188 | * - sessiond quit pipe | |
189 | * - consumerd (32-bit user space) channel rotate pipe, | |
190 | * - consumerd (64-bit user space) channel rotate pipe, | |
191 | * - consumerd (kernel) channel rotate pipe. | |
192 | */ | |
193 | ret = lttng_poll_create(poll_set, 4, LTTNG_CLOEXEC); | |
194 | if (ret < 0) { | |
195 | goto end; | |
196 | } | |
197 | ||
198 | ret = lttng_poll_add(poll_set, handle->thread_quit_pipe, | |
199 | LPOLLIN | LPOLLERR); | |
200 | if (ret < 0) { | |
201 | ERR("[rotation-thread] Failed to add thread_quit_pipe fd to pollset"); | |
202 | goto error; | |
203 | } | |
204 | ret = lttng_poll_add(poll_set, handle->ust32_consumer, | |
205 | LPOLLIN | LPOLLERR); | |
206 | if (ret < 0) { | |
207 | ERR("[rotation-thread] Failed to add ust-32 channel rotation pipe fd to pollset"); | |
208 | goto error; | |
209 | } | |
210 | ret = lttng_poll_add(poll_set, handle->ust64_consumer, | |
211 | LPOLLIN | LPOLLERR); | |
212 | if (ret < 0) { | |
213 | ERR("[rotation-thread] Failed to add ust-64 channel rotation pipe fd to pollset"); | |
214 | goto error; | |
215 | } | |
216 | if (handle->kernel_consumer < 0) { | |
217 | goto end; | |
218 | } | |
219 | ret = lttng_poll_add(poll_set, handle->kernel_consumer, | |
220 | LPOLLIN | LPOLLERR); | |
221 | if (ret < 0) { | |
222 | ERR("[rotation-thread] Failed to add kernel channel rotation pipe fd to pollset"); | |
223 | goto error; | |
224 | } | |
225 | ||
226 | end: | |
227 | return ret; | |
228 | error: | |
229 | lttng_poll_clean(poll_set); | |
230 | return ret; | |
231 | } | |
232 | ||
233 | static | |
234 | void fini_thread_state(struct rotation_thread_state *state) | |
235 | { | |
236 | lttng_poll_clean(&state->events); | |
237 | } | |
238 | ||
239 | static | |
240 | int init_thread_state(struct rotation_thread_handle *handle, | |
241 | struct rotation_thread_state *state) | |
242 | { | |
243 | int ret; | |
244 | ||
245 | memset(state, 0, sizeof(*state)); | |
246 | lttng_poll_init(&state->events); | |
247 | ||
248 | ret = init_poll_set(&state->events, handle); | |
249 | if (ret) { | |
250 | goto end; | |
251 | } | |
252 | ||
253 | channel_pending_rotate_ht = cds_lfht_new(DEFAULT_HT_SIZE, | |
254 | 1, 0, CDS_LFHT_AUTO_RESIZE | CDS_LFHT_ACCOUNTING, NULL); | |
255 | if (!channel_pending_rotate_ht) { | |
256 | ret = -1; | |
257 | } | |
258 | ||
259 | end: | |
260 | return 0; | |
261 | } | |
262 | ||
6e0be6cc JD |
263 | static |
264 | int handle_channel_rotation_pipe(int fd, uint32_t revents, | |
265 | struct rotation_thread_handle *handle, | |
266 | struct rotation_thread_state *state) | |
267 | { | |
268 | int ret = 0; | |
269 | enum lttng_domain_type domain; | |
270 | struct rotation_channel_info *channel_info; | |
271 | uint64_t key; | |
272 | ||
273 | if (fd == handle->ust32_consumer || | |
274 | fd == handle->ust64_consumer) { | |
275 | domain = LTTNG_DOMAIN_UST; | |
276 | } else if (fd == handle->kernel_consumer) { | |
277 | domain = LTTNG_DOMAIN_KERNEL; | |
278 | } else { | |
279 | abort(); | |
280 | } | |
281 | ||
282 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
283 | ret = lttng_poll_del(&state->events, fd); | |
284 | if (ret) { | |
103373d7 JD |
285 | ERR("[rotation-thread] Failed to remove consumer " |
286 | "rotation pipe from poll set"); | |
6e0be6cc JD |
287 | } |
288 | goto end; | |
289 | } | |
290 | ||
291 | do { | |
292 | ret = read(fd, &key, sizeof(key)); | |
293 | } while (ret == -1 && errno == EINTR); | |
294 | if (ret != sizeof(key)) { | |
295 | ERR("[rotation-thread] Failed to read from pipe (fd = %i)", | |
296 | fd); | |
297 | ret = -1; | |
298 | goto end; | |
299 | } | |
300 | ||
301 | DBG("[rotation-thread] Received notification for chan %" PRIu64 | |
302 | ", domain %d\n", key, domain); | |
303 | ||
304 | channel_info = lookup_channel_pending(key, domain); | |
305 | if (!channel_info) { | |
306 | ERR("[rotation-thread] Failed to find channel_info (key = %" | |
307 | PRIu64 ")", key); | |
308 | ret = -1; | |
309 | goto end; | |
310 | } | |
311 | ||
312 | if (--channel_info->session->nr_chan_rotate_pending == 0) { | |
313 | time_t now = time(NULL); | |
314 | ||
315 | if (now == (time_t) -1) { | |
4a478f45 | 316 | channel_info->session->rotate_status = LTTNG_ROTATE_ERROR; |
6e0be6cc JD |
317 | ret = LTTNG_ERR_ROTATE_NOT_AVAILABLE; |
318 | goto end; | |
319 | } | |
320 | ||
321 | ret = rename_complete_chunk(channel_info->session, now); | |
322 | if (ret < 0) { | |
323 | ERR("Failed to rename completed rotation chunk"); | |
324 | goto end; | |
325 | } | |
d3dedf27 | 326 | channel_info->session->rotate_pending = false; |
6e0be6cc JD |
327 | } |
328 | ||
329 | channel_rotation_info_destroy(channel_info); | |
330 | ||
331 | ret = 0; | |
332 | ||
333 | end: | |
334 | return ret; | |
335 | } | |
336 | ||
337 | void *thread_rotation(void *data) | |
338 | { | |
339 | int ret; | |
340 | struct rotation_thread_handle *handle = data; | |
341 | struct rotation_thread_state state; | |
342 | ||
343 | DBG("[rotation-thread] Started rotation thread"); | |
344 | ||
345 | if (!handle) { | |
346 | ERR("[rotation-thread] Invalid thread context provided"); | |
347 | goto end; | |
348 | } | |
349 | ||
350 | rcu_register_thread(); | |
351 | rcu_thread_online(); | |
352 | ||
353 | health_register(health_sessiond, HEALTH_SESSIOND_TYPE_ROTATION); | |
354 | health_code_update(); | |
355 | ||
356 | ret = init_thread_state(handle, &state); | |
357 | if (ret) { | |
358 | goto end; | |
359 | } | |
360 | ||
361 | /* Ready to handle client connections. */ | |
362 | sessiond_notify_ready(); | |
363 | ||
364 | while (true) { | |
365 | int fd_count, i; | |
366 | ||
367 | health_poll_entry(); | |
368 | DBG("[rotation-thread] Entering poll wait"); | |
369 | ret = lttng_poll_wait(&state.events, -1); | |
370 | DBG("[rotation-thread] Poll wait returned (%i)", ret); | |
371 | health_poll_exit(); | |
372 | if (ret < 0) { | |
373 | /* | |
374 | * Restart interrupted system call. | |
375 | */ | |
376 | if (errno == EINTR) { | |
377 | continue; | |
378 | } | |
379 | ERR("[rotation-thread] Error encountered during lttng_poll_wait (%i)", ret); | |
380 | goto error; | |
381 | } | |
382 | ||
383 | fd_count = ret; | |
384 | for (i = 0; i < fd_count; i++) { | |
385 | int fd = LTTNG_POLL_GETFD(&state.events, i); | |
386 | uint32_t revents = LTTNG_POLL_GETEV(&state.events, i); | |
387 | ||
388 | DBG("[rotation-thread] Handling fd (%i) activity (%u)", | |
389 | fd, revents); | |
390 | ||
391 | if (fd == handle->thread_quit_pipe) { | |
392 | DBG("[rotation-thread] Quit pipe activity"); | |
393 | goto exit; | |
394 | } else if (fd == handle->ust32_consumer || | |
395 | fd == handle->ust64_consumer || | |
396 | fd == handle->kernel_consumer) { | |
397 | ret = handle_channel_rotation_pipe(fd, | |
398 | revents, handle, &state); | |
399 | if (ret) { | |
400 | ERR("[rotation-thread] Exit main loop"); | |
401 | goto error; | |
402 | } | |
403 | } | |
404 | } | |
405 | } | |
406 | exit: | |
407 | error: | |
408 | fini_thread_state(&state); | |
409 | health_unregister(health_sessiond); | |
410 | rcu_thread_offline(); | |
411 | rcu_unregister_thread(); | |
412 | end: | |
413 | return NULL; | |
414 | } |