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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 <common/kernel-ctl/kernel-ctl.h> | |
29 | #include <sys/eventfd.h> | |
30 | #include <sys/stat.h> | |
31 | #include <time.h> | |
32 | #include <signal.h> | |
33 | #include <inttypes.h> | |
34 | ||
35 | #include "session.h" | |
36 | #include "rotate.h" | |
37 | #include "rotation-thread.h" | |
38 | #include "lttng-sessiond.h" | |
39 | #include "health-sessiond.h" | |
40 | #include "cmd.h" | |
41 | #include "utils.h" | |
42 | ||
43 | #include <urcu.h> | |
44 | #include <urcu/list.h> | |
45 | #include <urcu/rculfhash.h> | |
46 | ||
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 | /* The session's lock must be held by the caller. */ | |
54 | static | |
55 | int session_rename_chunk(struct ltt_session *session, char *current_path, | |
56 | char *new_path) | |
57 | { | |
58 | int ret; | |
59 | struct consumer_socket *socket; | |
60 | struct consumer_output *output; | |
61 | struct lttng_ht_iter iter; | |
62 | uid_t uid; | |
63 | gid_t gid; | |
64 | ||
65 | DBG("Renaming session chunk path of session \"%s\" from %s to %s", | |
66 | session->name, current_path, new_path); | |
67 | ||
68 | /* | |
69 | * Either one of the sessions is enough to find the consumer_output | |
70 | * and uid/gid. | |
71 | */ | |
72 | if (session->kernel_session) { | |
73 | output = session->kernel_session->consumer; | |
74 | uid = session->kernel_session->uid; | |
75 | gid = session->kernel_session->gid; | |
76 | } else if (session->ust_session) { | |
77 | output = session->ust_session->consumer; | |
78 | uid = session->ust_session->uid; | |
79 | gid = session->ust_session->gid; | |
80 | } else { | |
81 | assert(0); | |
82 | } | |
83 | ||
84 | if (!output || !output->socks) { | |
85 | ERR("No consumer output found for session \"%s\"", | |
86 | session->name); | |
87 | ret = -1; | |
88 | goto end; | |
89 | } | |
90 | ||
91 | rcu_read_lock(); | |
92 | /* | |
93 | * We have to iterate to find a socket, but we only need to send the | |
94 | * rename command to one consumer, so we break after the first one. | |
95 | */ | |
96 | cds_lfht_for_each_entry(output->socks->ht, &iter.iter, socket, node.node) { | |
97 | pthread_mutex_lock(socket->lock); | |
98 | ret = consumer_rotate_rename(socket, session->id, output, | |
99 | current_path, new_path, uid, gid); | |
100 | pthread_mutex_unlock(socket->lock); | |
101 | if (ret) { | |
102 | ret = -1; | |
103 | goto end_unlock; | |
104 | } | |
105 | break; | |
106 | } | |
107 | ||
108 | ret = 0; | |
109 | ||
110 | end_unlock: | |
111 | rcu_read_unlock(); | |
112 | end: | |
113 | return ret; | |
114 | } | |
115 | ||
116 | /* The session's lock must be held by the caller. */ | |
117 | static | |
118 | int rename_first_chunk(struct ltt_session *session, | |
119 | struct consumer_output *consumer, char *new_path) | |
120 | { | |
121 | int ret; | |
122 | char current_full_path[LTTNG_PATH_MAX], new_full_path[LTTNG_PATH_MAX]; | |
123 | ||
124 | /* Current domain path: <session>/kernel */ | |
125 | if (session->net_handle > 0) { | |
126 | ret = snprintf(current_full_path, sizeof(current_full_path), "%s/%s", | |
127 | consumer->dst.net.base_dir, consumer->subdir); | |
128 | if (ret < 0 || ret >= sizeof(current_full_path)) { | |
129 | ERR("Failed to initialize current full path while renaming first rotation chunk of session \"%s\"", | |
130 | session->name); | |
131 | ret = -1; | |
132 | goto error; | |
133 | } | |
134 | } else { | |
135 | ret = snprintf(current_full_path, sizeof(current_full_path), "%s/%s", | |
136 | consumer->dst.session_root_path, consumer->subdir); | |
137 | if (ret < 0 || ret >= sizeof(current_full_path)) { | |
138 | ERR("Failed to initialize current full path while renaming first rotation chunk of session \"%s\"", | |
139 | session->name); | |
140 | ret = -1; | |
141 | goto error; | |
142 | } | |
143 | } | |
144 | /* New domain path: <session>/<start-date>-<end-date>-<rotate-count>/kernel */ | |
145 | ret = snprintf(new_full_path, sizeof(new_full_path), "%s/%s", | |
146 | new_path, consumer->subdir); | |
147 | if (ret < 0 || ret >= sizeof(new_full_path)) { | |
148 | ERR("Failed to initialize new full path while renaming first rotation chunk of session \"%s\"", | |
149 | session->name); | |
150 | ret = -1; | |
151 | goto error; | |
152 | } | |
153 | /* | |
154 | * Move the per-domain fcurrenter inside the first rotation | |
155 | * fcurrenter. | |
156 | */ | |
157 | ret = session_rename_chunk(session, current_full_path, new_full_path); | |
158 | if (ret < 0) { | |
159 | ret = -LTTNG_ERR_UNK; | |
160 | goto error; | |
161 | } | |
162 | ||
163 | ret = 0; | |
164 | ||
165 | error: | |
166 | return ret; | |
167 | } | |
168 | ||
169 | /* | |
170 | * Rename a chunk folder after a rotation is complete. | |
171 | * session_lock_list and session lock must be held. | |
172 | * | |
173 | * Returns 0 on success, a negative value on error. | |
174 | */ | |
175 | int rename_complete_chunk(struct ltt_session *session, time_t ts) | |
176 | { | |
177 | struct tm *timeinfo; | |
178 | char datetime[16], start_datetime[16]; | |
179 | char new_path[LTTNG_PATH_MAX]; | |
180 | int ret; | |
181 | size_t strf_ret; | |
182 | ||
183 | DBG("Renaming completed chunk for session %s", session->name); | |
184 | timeinfo = localtime(&ts); | |
185 | if (!timeinfo) { | |
186 | ERR("Failed to retrieve local time while renaming completed chunk"); | |
187 | ret = -1; | |
188 | goto end; | |
189 | } | |
190 | strf_ret = strftime(datetime, sizeof(datetime), "%Y%m%d-%H%M%S", | |
191 | timeinfo); | |
192 | if (strf_ret == 0) { | |
193 | ERR("Failed to format timestamp while renaming completed session chunk"); | |
194 | ret = -1; | |
195 | goto end; | |
196 | } | |
197 | ||
198 | if (session->rotate_count == 1) { | |
199 | char start_time[16]; | |
200 | ||
201 | timeinfo = localtime(&session->last_chunk_start_ts); | |
202 | if (!timeinfo) { | |
203 | ERR("Failed to retrieve local time while renaming completed chunk"); | |
204 | ret = -1; | |
205 | goto end; | |
206 | } | |
207 | ||
208 | strf_ret = strftime(start_time, sizeof(start_time), | |
209 | "%Y%m%d-%H%M%S", timeinfo); | |
210 | if (strf_ret == 0) { | |
211 | ERR("Failed to format timestamp while renaming completed session chunk"); | |
212 | ret = -1; | |
213 | goto end; | |
214 | } | |
215 | ||
216 | /* | |
217 | * On the first rotation, the current_rotate_path is the | |
218 | * session_root_path, so we need to create the chunk folder | |
219 | * and move the domain-specific folders inside it. | |
220 | */ | |
221 | ret = snprintf(new_path, sizeof(new_path), "%s/%s-%s-%" PRIu64, | |
222 | session->rotation_chunk.current_rotate_path, | |
223 | start_time, | |
224 | datetime, session->rotate_count); | |
225 | if (ret < 0 || ret >= sizeof(new_path)) { | |
226 | ERR("Failed to format new chunk path while renaming session \"%s\"'s first chunk", | |
227 | session->name); | |
228 | ret = -1; | |
229 | goto end; | |
230 | } | |
231 | ||
232 | if (session->kernel_session) { | |
233 | ret = rename_first_chunk(session, | |
234 | session->kernel_session->consumer, | |
235 | new_path); | |
236 | if (ret) { | |
237 | ERR("Failed to rename kernel session trace folder to %s", new_path); | |
238 | /* | |
239 | * This is not a fatal error for the rotation | |
240 | * thread, we just need to inform the client | |
241 | * that a problem occurred with the rotation. | |
242 | * Returning 0, same for the other errors | |
243 | * below. | |
244 | */ | |
245 | ret = 0; | |
246 | goto error; | |
247 | } | |
248 | } | |
249 | if (session->ust_session) { | |
250 | ret = rename_first_chunk(session, | |
251 | session->ust_session->consumer, | |
252 | new_path); | |
253 | if (ret) { | |
254 | ERR("Failed to rename userspace session trace folder to %s", new_path); | |
255 | ret = 0; | |
256 | goto error; | |
257 | } | |
258 | } | |
259 | } else { | |
260 | /* | |
261 | * After the first rotation, all the trace data is already in | |
262 | * its own chunk folder, we just need to append the suffix. | |
263 | */ | |
264 | /* Recreate the session->rotation_chunk.current_rotate_path */ | |
265 | timeinfo = localtime(&session->last_chunk_start_ts); | |
266 | if (!timeinfo) { | |
267 | ERR("Failed to retrieve local time while renaming completed chunk"); | |
268 | ret = -1; | |
269 | goto end; | |
270 | } | |
271 | strf_ret = strftime(start_datetime, sizeof(start_datetime), "%Y%m%d-%H%M%S", timeinfo); | |
272 | if (!strf_ret) { | |
273 | ERR("Failed to format timestamp while renaming completed session chunk"); | |
274 | ret = -1; | |
275 | goto end; | |
276 | } | |
277 | ret = snprintf(new_path, sizeof(new_path), "%s/%s-%s-%" PRIu64, | |
278 | session_get_base_path(session), | |
279 | start_datetime, | |
280 | datetime, session->rotate_count); | |
281 | if (ret < 0 || ret >= sizeof(new_path)) { | |
282 | ERR("Failed to format new chunk path while renaming chunk of session \"%s\"", | |
283 | session->name); | |
284 | ret = -1; | |
285 | goto error; | |
286 | } | |
287 | ret = session_rename_chunk(session, | |
288 | session->rotation_chunk.current_rotate_path, | |
289 | new_path); | |
290 | if (ret) { | |
291 | ERR("Failed to rename session trace folder from %s to %s", | |
292 | session->rotation_chunk.current_rotate_path, | |
293 | new_path); | |
294 | ret = 0; | |
295 | goto error; | |
296 | } | |
297 | } | |
298 | ||
299 | /* | |
300 | * Store the path where the readable chunk is. This path is valid | |
301 | * and can be queried by the client with rotate_pending until the next | |
302 | * rotation is started. | |
303 | */ | |
304 | ret = lttng_strncpy(session->rotation_chunk.current_rotate_path, | |
305 | new_path, | |
306 | sizeof(session->rotation_chunk.current_rotate_path)); | |
307 | if (ret) { | |
308 | ERR("Failed the current chunk's path of session \"%s\"", | |
309 | session->name); | |
310 | ret = -1; | |
311 | goto error; | |
312 | } | |
313 | ||
314 | goto end; | |
315 | ||
316 | error: | |
317 | session->rotation_status = LTTNG_ROTATION_STATUS_ERROR; | |
318 | end: | |
319 | return ret; | |
320 | } |