| 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 <lttng/rotate-internal.h> |
| 36 | |
| 37 | #include "session.h" |
| 38 | #include "rotate.h" |
| 39 | #include "rotation-thread.h" |
| 40 | #include "lttng-sessiond.h" |
| 41 | #include "health-sessiond.h" |
| 42 | #include "cmd.h" |
| 43 | #include "utils.h" |
| 44 | |
| 45 | #include <urcu.h> |
| 46 | #include <urcu/list.h> |
| 47 | #include <urcu/rculfhash.h> |
| 48 | |
| 49 | unsigned long hash_channel_key(struct rotation_channel_key *key) |
| 50 | { |
| 51 | return hash_key_u64(&key->key, lttng_ht_seed) ^ hash_key_ulong( |
| 52 | (void *) (unsigned long) key->domain, lttng_ht_seed); |
| 53 | } |
| 54 | |
| 55 | int rotate_add_channel_pending(uint64_t key, enum lttng_domain_type domain, |
| 56 | struct ltt_session *session) |
| 57 | { |
| 58 | int ret; |
| 59 | struct rotation_channel_info *new_info; |
| 60 | struct rotation_channel_key channel_key = { .key = key, |
| 61 | .domain = domain }; |
| 62 | |
| 63 | new_info = zmalloc(sizeof(struct rotation_channel_info)); |
| 64 | if (!new_info) { |
| 65 | goto error; |
| 66 | } |
| 67 | |
| 68 | new_info->channel_key.key = key; |
| 69 | new_info->channel_key.domain = domain; |
| 70 | new_info->session_id = session->id; |
| 71 | cds_lfht_node_init(&new_info->rotate_channels_ht_node); |
| 72 | |
| 73 | session->nr_chan_rotate_pending++; |
| 74 | cds_lfht_add(channel_pending_rotate_ht, |
| 75 | hash_channel_key(&channel_key), |
| 76 | &new_info->rotate_channels_ht_node); |
| 77 | |
| 78 | ret = 0; |
| 79 | goto end; |
| 80 | |
| 81 | error: |
| 82 | ret = -1; |
| 83 | end: |
| 84 | return ret; |
| 85 | } |
| 86 | |
| 87 | /* The session's lock must be held by the caller. */ |
| 88 | static |
| 89 | int session_rename_chunk(struct ltt_session *session, char *current_path, |
| 90 | char *new_path) |
| 91 | { |
| 92 | int ret; |
| 93 | struct consumer_socket *socket; |
| 94 | struct consumer_output *output; |
| 95 | struct lttng_ht_iter iter; |
| 96 | uid_t uid; |
| 97 | gid_t gid; |
| 98 | |
| 99 | DBG("Renaming session chunk path of session \"%s\" from %s to %s", |
| 100 | session->name, current_path, new_path); |
| 101 | |
| 102 | /* |
| 103 | * Either one of the sessions is enough to find the consumer_output |
| 104 | * and uid/gid. |
| 105 | */ |
| 106 | if (session->kernel_session) { |
| 107 | output = session->kernel_session->consumer; |
| 108 | uid = session->kernel_session->uid; |
| 109 | gid = session->kernel_session->gid; |
| 110 | } else if (session->ust_session) { |
| 111 | output = session->ust_session->consumer; |
| 112 | uid = session->ust_session->uid; |
| 113 | gid = session->ust_session->gid; |
| 114 | } else { |
| 115 | assert(0); |
| 116 | } |
| 117 | |
| 118 | if (!output || !output->socks) { |
| 119 | ERR("No consumer output found for session \"%s\"", |
| 120 | session->name); |
| 121 | ret = -1; |
| 122 | goto end; |
| 123 | } |
| 124 | |
| 125 | rcu_read_lock(); |
| 126 | /* |
| 127 | * We have to iterate to find a socket, but we only need to send the |
| 128 | * rename command to one consumer, so we break after the first one. |
| 129 | */ |
| 130 | cds_lfht_for_each_entry(output->socks->ht, &iter.iter, socket, node.node) { |
| 131 | pthread_mutex_lock(socket->lock); |
| 132 | ret = consumer_rotate_rename(socket, session->id, output, |
| 133 | current_path, new_path, uid, gid); |
| 134 | pthread_mutex_unlock(socket->lock); |
| 135 | if (ret) { |
| 136 | ret = -1; |
| 137 | goto end_unlock; |
| 138 | } |
| 139 | break; |
| 140 | } |
| 141 | |
| 142 | ret = 0; |
| 143 | |
| 144 | end_unlock: |
| 145 | rcu_read_unlock(); |
| 146 | end: |
| 147 | return ret; |
| 148 | } |
| 149 | |
| 150 | /* The session's lock must be held by the caller. */ |
| 151 | static |
| 152 | int rename_first_chunk(struct ltt_session *session, |
| 153 | struct consumer_output *consumer, char *new_path) |
| 154 | { |
| 155 | int ret; |
| 156 | char current_full_path[LTTNG_PATH_MAX], new_full_path[LTTNG_PATH_MAX]; |
| 157 | |
| 158 | /* Current domain path: <session>/kernel */ |
| 159 | if (session->net_handle > 0) { |
| 160 | ret = snprintf(current_full_path, sizeof(current_full_path), "%s/%s", |
| 161 | consumer->dst.net.base_dir, consumer->subdir); |
| 162 | if (ret < 0 || ret >= sizeof(current_full_path)) { |
| 163 | ERR("Failed to initialize current full path while renaming first rotation chunk of session \"%s\"", |
| 164 | session->name); |
| 165 | ret = -1; |
| 166 | goto error; |
| 167 | } |
| 168 | } else { |
| 169 | ret = snprintf(current_full_path, sizeof(current_full_path), "%s/%s", |
| 170 | consumer->dst.session_root_path, consumer->subdir); |
| 171 | if (ret < 0 || ret >= sizeof(current_full_path)) { |
| 172 | ERR("Failed to initialize current full path while renaming first rotation chunk of session \"%s\"", |
| 173 | session->name); |
| 174 | ret = -1; |
| 175 | goto error; |
| 176 | } |
| 177 | } |
| 178 | /* New domain path: <session>/<start-date>-<end-date>-<rotate-count>/kernel */ |
| 179 | ret = snprintf(new_full_path, sizeof(new_full_path), "%s/%s", |
| 180 | new_path, consumer->subdir); |
| 181 | if (ret < 0 || ret >= sizeof(new_full_path)) { |
| 182 | ERR("Failed to initialize new full path while renaming first rotation chunk of session \"%s\"", |
| 183 | session->name); |
| 184 | ret = -1; |
| 185 | goto error; |
| 186 | } |
| 187 | /* |
| 188 | * Move the per-domain fcurrenter inside the first rotation |
| 189 | * fcurrenter. |
| 190 | */ |
| 191 | ret = session_rename_chunk(session, current_full_path, new_full_path); |
| 192 | if (ret < 0) { |
| 193 | ret = -LTTNG_ERR_UNK; |
| 194 | goto error; |
| 195 | } |
| 196 | |
| 197 | ret = 0; |
| 198 | |
| 199 | error: |
| 200 | return ret; |
| 201 | } |
| 202 | |
| 203 | /* |
| 204 | * Rename a chunk folder after a rotation is complete. |
| 205 | * session_lock_list and session lock must be held. |
| 206 | * |
| 207 | * Returns 0 on success, a negative value on error. |
| 208 | */ |
| 209 | int rename_complete_chunk(struct ltt_session *session, time_t ts) |
| 210 | { |
| 211 | struct tm *timeinfo; |
| 212 | char new_path[LTTNG_PATH_MAX]; |
| 213 | char datetime[21], start_datetime[21]; |
| 214 | int ret; |
| 215 | size_t strf_ret; |
| 216 | |
| 217 | DBG("Renaming completed chunk for session %s", session->name); |
| 218 | timeinfo = localtime(&ts); |
| 219 | if (!timeinfo) { |
| 220 | ERR("Failed to retrieve local time while renaming completed chunk"); |
| 221 | ret = -1; |
| 222 | goto end; |
| 223 | } |
| 224 | |
| 225 | strf_ret = strftime(datetime, sizeof(datetime), "%Y%m%dT%H%M%S%z", |
| 226 | timeinfo); |
| 227 | if (strf_ret == 0) { |
| 228 | ERR("Failed to format timestamp while renaming completed session chunk"); |
| 229 | ret = -1; |
| 230 | goto end; |
| 231 | } |
| 232 | |
| 233 | if (session->rotate_count == 1) { |
| 234 | char start_time[21]; |
| 235 | |
| 236 | timeinfo = localtime(&session->last_chunk_start_ts); |
| 237 | if (!timeinfo) { |
| 238 | ERR("Failed to retrieve local time while renaming completed chunk"); |
| 239 | ret = -1; |
| 240 | goto end; |
| 241 | } |
| 242 | |
| 243 | strf_ret = strftime(start_time, sizeof(start_time), |
| 244 | "%Y%m%dT%H%M%S%z", timeinfo); |
| 245 | if (strf_ret == 0) { |
| 246 | ERR("Failed to format timestamp while renaming completed session chunk"); |
| 247 | ret = -1; |
| 248 | goto end; |
| 249 | } |
| 250 | |
| 251 | /* |
| 252 | * On the first rotation, the current_rotate_path is the |
| 253 | * session_root_path, so we need to create the chunk folder |
| 254 | * and move the domain-specific folders inside it. |
| 255 | */ |
| 256 | ret = snprintf(new_path, sizeof(new_path), "%s/%s-%s-%" PRIu64, |
| 257 | session->rotation_chunk.current_rotate_path, |
| 258 | start_time, |
| 259 | datetime, session->rotate_count); |
| 260 | if (ret < 0 || ret >= sizeof(new_path)) { |
| 261 | ERR("Failed to format new chunk path while renaming session \"%s\"'s first chunk", |
| 262 | session->name); |
| 263 | ret = -1; |
| 264 | goto end; |
| 265 | } |
| 266 | |
| 267 | if (session->kernel_session) { |
| 268 | ret = rename_first_chunk(session, |
| 269 | session->kernel_session->consumer, |
| 270 | new_path); |
| 271 | if (ret) { |
| 272 | ERR("Failed to rename kernel session trace folder to %s", new_path); |
| 273 | /* |
| 274 | * This is not a fatal error for the rotation |
| 275 | * thread, we just need to inform the client |
| 276 | * that a problem occurred with the rotation. |
| 277 | * Returning 0, same for the other errors |
| 278 | * below. |
| 279 | */ |
| 280 | ret = 0; |
| 281 | goto error; |
| 282 | } |
| 283 | } |
| 284 | if (session->ust_session) { |
| 285 | ret = rename_first_chunk(session, |
| 286 | session->ust_session->consumer, |
| 287 | new_path); |
| 288 | if (ret) { |
| 289 | ERR("Failed to rename userspace session trace folder to %s", new_path); |
| 290 | ret = 0; |
| 291 | goto error; |
| 292 | } |
| 293 | } |
| 294 | } else { |
| 295 | /* |
| 296 | * After the first rotation, all the trace data is already in |
| 297 | * its own chunk folder, we just need to append the suffix. |
| 298 | */ |
| 299 | /* Recreate the session->rotation_chunk.current_rotate_path */ |
| 300 | timeinfo = localtime(&session->last_chunk_start_ts); |
| 301 | if (!timeinfo) { |
| 302 | ERR("Failed to retrieve local time while renaming completed chunk"); |
| 303 | ret = -1; |
| 304 | goto end; |
| 305 | } |
| 306 | strf_ret = strftime(start_datetime, sizeof(start_datetime), |
| 307 | "%Y%m%dT%H%M%S%z", timeinfo); |
| 308 | if (!strf_ret) { |
| 309 | ERR("Failed to format timestamp while renaming completed session chunk"); |
| 310 | ret = -1; |
| 311 | goto end; |
| 312 | } |
| 313 | ret = snprintf(new_path, sizeof(new_path), "%s/%s-%s-%" PRIu64, |
| 314 | session_get_base_path(session), |
| 315 | start_datetime, |
| 316 | datetime, session->rotate_count); |
| 317 | if (ret < 0 || ret >= sizeof(new_path)) { |
| 318 | ERR("Failed to format new chunk path while renaming chunk of session \"%s\"", |
| 319 | session->name); |
| 320 | ret = -1; |
| 321 | goto error; |
| 322 | } |
| 323 | ret = session_rename_chunk(session, |
| 324 | session->rotation_chunk.current_rotate_path, |
| 325 | new_path); |
| 326 | if (ret) { |
| 327 | ERR("Failed to rename session trace folder from %s to %s", |
| 328 | session->rotation_chunk.current_rotate_path, |
| 329 | new_path); |
| 330 | ret = 0; |
| 331 | goto error; |
| 332 | } |
| 333 | } |
| 334 | |
| 335 | /* |
| 336 | * Store the path where the readable chunk is. This path is valid |
| 337 | * and can be queried by the client with rotate_pending until the next |
| 338 | * rotation is started. |
| 339 | */ |
| 340 | ret = lttng_strncpy(session->rotation_chunk.current_rotate_path, |
| 341 | new_path, |
| 342 | sizeof(session->rotation_chunk.current_rotate_path)); |
| 343 | if (ret) { |
| 344 | ERR("Failed the current chunk's path of session \"%s\"", |
| 345 | session->name); |
| 346 | ret = -1; |
| 347 | goto error; |
| 348 | } |
| 349 | |
| 350 | goto end; |
| 351 | |
| 352 | error: |
| 353 | session->rotation_state = LTTNG_ROTATION_STATE_ERROR; |
| 354 | end: |
| 355 | return ret; |
| 356 | } |
| 357 | |
| 358 | int relay_rotate_pending(struct ltt_session *session, uint64_t chunk_id) |
| 359 | { |
| 360 | int ret; |
| 361 | struct consumer_socket *socket; |
| 362 | struct consumer_output *output; |
| 363 | struct lttng_ht_iter iter; |
| 364 | |
| 365 | /* |
| 366 | * Either one of the sessions is enough to find the consumer_output |
| 367 | * and uid/gid. |
| 368 | */ |
| 369 | if (session->kernel_session) { |
| 370 | output = session->kernel_session->consumer; |
| 371 | } else if (session->ust_session) { |
| 372 | output = session->ust_session->consumer; |
| 373 | } else { |
| 374 | assert(0); |
| 375 | } |
| 376 | |
| 377 | if (!output || !output->socks) { |
| 378 | ERR("No consumer output found"); |
| 379 | ret = -1; |
| 380 | goto end; |
| 381 | } |
| 382 | |
| 383 | ret = -1; |
| 384 | |
| 385 | rcu_read_lock(); |
| 386 | /* |
| 387 | * We have to iterate to find a socket, but we only need to send the |
| 388 | * rotate pending command to one consumer, so we break after the first |
| 389 | * one. |
| 390 | */ |
| 391 | cds_lfht_for_each_entry(output->socks->ht, &iter.iter, socket, |
| 392 | node.node) { |
| 393 | pthread_mutex_lock(socket->lock); |
| 394 | ret = consumer_rotate_pending_relay(socket, output, session->id, |
| 395 | chunk_id); |
| 396 | pthread_mutex_unlock(socket->lock); |
| 397 | break; |
| 398 | } |
| 399 | rcu_read_unlock(); |
| 400 | |
| 401 | end: |
| 402 | return ret; |
| 403 | } |