| 1 | /* |
| 2 | * Copyright (C) 2011 - Julien Desfossez <julien.desfossez@polymtl.ca> |
| 3 | * Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
| 4 | * Copyright (C) 2013 - David Goulet <dgoulet@efficios.com> |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify it |
| 7 | * under the terms of the GNU General Public License, version 2 only, as |
| 8 | * published by the Free Software Foundation. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, but WITHOUT |
| 11 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 12 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
| 13 | * more details. |
| 14 | * |
| 15 | * You should have received a copy of the GNU General Public License along with |
| 16 | * this program; if not, write to the Free Software Foundation, Inc., 51 |
| 17 | * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
| 18 | */ |
| 19 | |
| 20 | #define _LGPL_SOURCE |
| 21 | #include <assert.h> |
| 22 | #include <inttypes.h> |
| 23 | #include <sys/mman.h> |
| 24 | #include <unistd.h> |
| 25 | |
| 26 | #include <common/common.h> |
| 27 | #include <common/index/index.h> |
| 28 | #include <common/kernel-consumer/kernel-consumer.h> |
| 29 | #include <common/relayd/relayd.h> |
| 30 | #include <common/ust-consumer/ust-consumer.h> |
| 31 | #include <common/utils.h> |
| 32 | #include <common/consumer/consumer.h> |
| 33 | #include <common/consumer/consumer-timer.h> |
| 34 | #include <common/consumer/metadata-bucket.h> |
| 35 | |
| 36 | #include "consumer-stream.h" |
| 37 | |
| 38 | /* |
| 39 | * RCU call to free stream. MUST only be used with call_rcu(). |
| 40 | */ |
| 41 | static void free_stream_rcu(struct rcu_head *head) |
| 42 | { |
| 43 | struct lttng_ht_node_u64 *node = |
| 44 | caa_container_of(head, struct lttng_ht_node_u64, head); |
| 45 | struct lttng_consumer_stream *stream = |
| 46 | caa_container_of(node, struct lttng_consumer_stream, node); |
| 47 | |
| 48 | pthread_mutex_destroy(&stream->lock); |
| 49 | free(stream); |
| 50 | } |
| 51 | |
| 52 | static void consumer_stream_data_lock_all(struct lttng_consumer_stream *stream) |
| 53 | { |
| 54 | pthread_mutex_lock(&stream->chan->lock); |
| 55 | pthread_mutex_lock(&stream->lock); |
| 56 | } |
| 57 | |
| 58 | static void consumer_stream_data_unlock_all(struct lttng_consumer_stream *stream) |
| 59 | { |
| 60 | pthread_mutex_unlock(&stream->lock); |
| 61 | pthread_mutex_unlock(&stream->chan->lock); |
| 62 | } |
| 63 | |
| 64 | static void consumer_stream_metadata_lock_all(struct lttng_consumer_stream *stream) |
| 65 | { |
| 66 | consumer_stream_data_lock_all(stream); |
| 67 | pthread_mutex_lock(&stream->metadata_rdv_lock); |
| 68 | } |
| 69 | |
| 70 | static void consumer_stream_metadata_unlock_all(struct lttng_consumer_stream *stream) |
| 71 | { |
| 72 | pthread_mutex_unlock(&stream->metadata_rdv_lock); |
| 73 | consumer_stream_data_unlock_all(stream); |
| 74 | } |
| 75 | |
| 76 | /* Only used for data streams. */ |
| 77 | static int consumer_stream_update_stats(struct lttng_consumer_stream *stream, |
| 78 | const struct stream_subbuffer *subbuf) |
| 79 | { |
| 80 | int ret = 0; |
| 81 | uint64_t sequence_number; |
| 82 | const uint64_t discarded_events = subbuf->info.data.events_discarded; |
| 83 | |
| 84 | if (!subbuf->info.data.sequence_number.is_set) { |
| 85 | /* Command not supported by the tracer. */ |
| 86 | sequence_number = -1ULL; |
| 87 | stream->sequence_number_unavailable = true; |
| 88 | } else { |
| 89 | sequence_number = subbuf->info.data.sequence_number.value; |
| 90 | } |
| 91 | |
| 92 | /* |
| 93 | * Start the sequence when we extract the first packet in case we don't |
| 94 | * start at 0 (for example if a consumer is not connected to the |
| 95 | * session immediately after the beginning). |
| 96 | */ |
| 97 | if (stream->last_sequence_number == -1ULL) { |
| 98 | stream->last_sequence_number = sequence_number; |
| 99 | } else if (sequence_number > stream->last_sequence_number) { |
| 100 | stream->chan->lost_packets += sequence_number - |
| 101 | stream->last_sequence_number - 1; |
| 102 | } else { |
| 103 | /* seq <= last_sequence_number */ |
| 104 | ERR("Sequence number inconsistent : prev = %" PRIu64 |
| 105 | ", current = %" PRIu64, |
| 106 | stream->last_sequence_number, sequence_number); |
| 107 | ret = -1; |
| 108 | goto end; |
| 109 | } |
| 110 | stream->last_sequence_number = sequence_number; |
| 111 | |
| 112 | if (discarded_events < stream->last_discarded_events) { |
| 113 | /* |
| 114 | * Overflow has occurred. We assume only one wrap-around |
| 115 | * has occurred. |
| 116 | */ |
| 117 | stream->chan->discarded_events += |
| 118 | (1ULL << (CAA_BITS_PER_LONG - 1)) - |
| 119 | stream->last_discarded_events + |
| 120 | discarded_events; |
| 121 | } else { |
| 122 | stream->chan->discarded_events += discarded_events - |
| 123 | stream->last_discarded_events; |
| 124 | } |
| 125 | stream->last_discarded_events = discarded_events; |
| 126 | ret = 0; |
| 127 | |
| 128 | end: |
| 129 | return ret; |
| 130 | } |
| 131 | |
| 132 | static |
| 133 | void ctf_packet_index_populate(struct ctf_packet_index *index, |
| 134 | off_t offset, const struct stream_subbuffer *subbuffer) |
| 135 | { |
| 136 | *index = (typeof(*index)){ |
| 137 | .offset = htobe64(offset), |
| 138 | .packet_size = htobe64(subbuffer->info.data.packet_size), |
| 139 | .content_size = htobe64(subbuffer->info.data.content_size), |
| 140 | .timestamp_begin = htobe64( |
| 141 | subbuffer->info.data.timestamp_begin), |
| 142 | .timestamp_end = htobe64( |
| 143 | subbuffer->info.data.timestamp_end), |
| 144 | .events_discarded = htobe64( |
| 145 | subbuffer->info.data.events_discarded), |
| 146 | .stream_id = htobe64(subbuffer->info.data.stream_id), |
| 147 | .stream_instance_id = htobe64( |
| 148 | subbuffer->info.data.stream_instance_id.is_set ? |
| 149 | subbuffer->info.data.stream_instance_id.value : -1ULL), |
| 150 | .packet_seq_num = htobe64( |
| 151 | subbuffer->info.data.sequence_number.is_set ? |
| 152 | subbuffer->info.data.sequence_number.value : -1ULL), |
| 153 | }; |
| 154 | } |
| 155 | |
| 156 | static ssize_t consumer_stream_consume_mmap( |
| 157 | struct lttng_consumer_local_data *ctx, |
| 158 | struct lttng_consumer_stream *stream, |
| 159 | const struct stream_subbuffer *subbuffer) |
| 160 | { |
| 161 | const unsigned long padding_size = |
| 162 | subbuffer->info.data.padded_subbuf_size - |
| 163 | subbuffer->info.data.subbuf_size; |
| 164 | |
| 165 | return lttng_consumer_on_read_subbuffer_mmap( |
| 166 | stream, &subbuffer->buffer.buffer, padding_size); |
| 167 | } |
| 168 | |
| 169 | static ssize_t consumer_stream_consume_splice( |
| 170 | struct lttng_consumer_local_data *ctx, |
| 171 | struct lttng_consumer_stream *stream, |
| 172 | const struct stream_subbuffer *subbuffer) |
| 173 | { |
| 174 | return lttng_consumer_on_read_subbuffer_splice(ctx, stream, |
| 175 | subbuffer->info.data.padded_subbuf_size, 0); |
| 176 | } |
| 177 | |
| 178 | static int consumer_stream_send_index( |
| 179 | struct lttng_consumer_stream *stream, |
| 180 | const struct stream_subbuffer *subbuffer, |
| 181 | struct lttng_consumer_local_data *ctx) |
| 182 | { |
| 183 | off_t packet_offset = 0; |
| 184 | struct ctf_packet_index index = {}; |
| 185 | |
| 186 | /* |
| 187 | * This is called after consuming the sub-buffer; substract the |
| 188 | * effect this sub-buffer from the offset. |
| 189 | */ |
| 190 | if (stream->net_seq_idx == (uint64_t) -1ULL) { |
| 191 | packet_offset = stream->out_fd_offset - |
| 192 | subbuffer->info.data.padded_subbuf_size; |
| 193 | } |
| 194 | |
| 195 | ctf_packet_index_populate(&index, packet_offset, subbuffer); |
| 196 | return consumer_stream_write_index(stream, &index); |
| 197 | } |
| 198 | |
| 199 | /* |
| 200 | * Actually do the metadata sync using the given metadata stream. |
| 201 | * |
| 202 | * Return 0 on success else a negative value. ENODATA can be returned also |
| 203 | * indicating that there is no metadata available for that stream. |
| 204 | */ |
| 205 | static int do_sync_metadata(struct lttng_consumer_stream *metadata, |
| 206 | struct lttng_consumer_local_data *ctx) |
| 207 | { |
| 208 | int ret; |
| 209 | |
| 210 | assert(metadata); |
| 211 | assert(metadata->metadata_flag); |
| 212 | assert(ctx); |
| 213 | |
| 214 | /* |
| 215 | * In UST, since we have to write the metadata from the cache packet |
| 216 | * by packet, we might need to start this procedure multiple times |
| 217 | * until all the metadata from the cache has been extracted. |
| 218 | */ |
| 219 | do { |
| 220 | /* |
| 221 | * Steps : |
| 222 | * - Lock the metadata stream |
| 223 | * - Check if metadata stream node was deleted before locking. |
| 224 | * - if yes, release and return success |
| 225 | * - Check if new metadata is ready (flush + snapshot pos) |
| 226 | * - If nothing : release and return. |
| 227 | * - Lock the metadata_rdv_lock |
| 228 | * - Unlock the metadata stream |
| 229 | * - cond_wait on metadata_rdv to wait the wakeup from the |
| 230 | * metadata thread |
| 231 | * - Unlock the metadata_rdv_lock |
| 232 | */ |
| 233 | pthread_mutex_lock(&metadata->lock); |
| 234 | |
| 235 | /* |
| 236 | * There is a possibility that we were able to acquire a reference on the |
| 237 | * stream from the RCU hash table but between then and now, the node might |
| 238 | * have been deleted just before the lock is acquired. Thus, after locking, |
| 239 | * we make sure the metadata node has not been deleted which means that the |
| 240 | * buffers are closed. |
| 241 | * |
| 242 | * In that case, there is no need to sync the metadata hence returning a |
| 243 | * success return code. |
| 244 | */ |
| 245 | ret = cds_lfht_is_node_deleted(&metadata->node.node); |
| 246 | if (ret) { |
| 247 | ret = 0; |
| 248 | goto end_unlock_mutex; |
| 249 | } |
| 250 | |
| 251 | switch (ctx->type) { |
| 252 | case LTTNG_CONSUMER_KERNEL: |
| 253 | /* |
| 254 | * Empty the metadata cache and flush the current stream. |
| 255 | */ |
| 256 | ret = lttng_kconsumer_sync_metadata(metadata); |
| 257 | break; |
| 258 | case LTTNG_CONSUMER32_UST: |
| 259 | case LTTNG_CONSUMER64_UST: |
| 260 | /* |
| 261 | * Ask the sessiond if we have new metadata waiting and update the |
| 262 | * consumer metadata cache. |
| 263 | */ |
| 264 | ret = lttng_ustconsumer_sync_metadata(ctx, metadata); |
| 265 | break; |
| 266 | default: |
| 267 | assert(0); |
| 268 | ret = -1; |
| 269 | break; |
| 270 | } |
| 271 | /* |
| 272 | * Error or no new metadata, we exit here. |
| 273 | */ |
| 274 | if (ret <= 0 || ret == ENODATA) { |
| 275 | goto end_unlock_mutex; |
| 276 | } |
| 277 | |
| 278 | /* |
| 279 | * At this point, new metadata have been flushed, so we wait on the |
| 280 | * rendez-vous point for the metadata thread to wake us up when it |
| 281 | * finishes consuming the metadata and continue execution. |
| 282 | */ |
| 283 | |
| 284 | pthread_mutex_lock(&metadata->metadata_rdv_lock); |
| 285 | |
| 286 | /* |
| 287 | * Release metadata stream lock so the metadata thread can process it. |
| 288 | */ |
| 289 | pthread_mutex_unlock(&metadata->lock); |
| 290 | |
| 291 | /* |
| 292 | * Wait on the rendez-vous point. Once woken up, it means the metadata was |
| 293 | * consumed and thus synchronization is achieved. |
| 294 | */ |
| 295 | pthread_cond_wait(&metadata->metadata_rdv, &metadata->metadata_rdv_lock); |
| 296 | pthread_mutex_unlock(&metadata->metadata_rdv_lock); |
| 297 | } while (ret == EAGAIN); |
| 298 | |
| 299 | /* Success */ |
| 300 | return 0; |
| 301 | |
| 302 | end_unlock_mutex: |
| 303 | pthread_mutex_unlock(&metadata->lock); |
| 304 | return ret; |
| 305 | } |
| 306 | |
| 307 | /* |
| 308 | * Synchronize the metadata using a given session ID. A successful acquisition |
| 309 | * of a metadata stream will trigger a request to the session daemon and a |
| 310 | * snapshot so the metadata thread can consume it. |
| 311 | * |
| 312 | * This function call is a rendez-vous point between the metadata thread and |
| 313 | * the data thread. |
| 314 | * |
| 315 | * Return 0 on success or else a negative value. |
| 316 | */ |
| 317 | int consumer_stream_sync_metadata(struct lttng_consumer_local_data *ctx, |
| 318 | uint64_t session_id) |
| 319 | { |
| 320 | int ret; |
| 321 | struct lttng_consumer_stream *stream = NULL; |
| 322 | struct lttng_ht_iter iter; |
| 323 | struct lttng_ht *ht; |
| 324 | |
| 325 | assert(ctx); |
| 326 | |
| 327 | /* Ease our life a bit. */ |
| 328 | ht = consumer_data.stream_list_ht; |
| 329 | |
| 330 | rcu_read_lock(); |
| 331 | |
| 332 | /* Search the metadata associated with the session id of the given stream. */ |
| 333 | |
| 334 | cds_lfht_for_each_entry_duplicate(ht->ht, |
| 335 | ht->hash_fct(&session_id, lttng_ht_seed), ht->match_fct, |
| 336 | &session_id, &iter.iter, stream, node_session_id.node) { |
| 337 | if (!stream->metadata_flag) { |
| 338 | continue; |
| 339 | } |
| 340 | |
| 341 | ret = do_sync_metadata(stream, ctx); |
| 342 | if (ret < 0) { |
| 343 | goto end; |
| 344 | } |
| 345 | } |
| 346 | |
| 347 | /* |
| 348 | * Force return code to 0 (success) since ret might be ENODATA for instance |
| 349 | * which is not an error but rather that we should come back. |
| 350 | */ |
| 351 | ret = 0; |
| 352 | |
| 353 | end: |
| 354 | rcu_read_unlock(); |
| 355 | return ret; |
| 356 | } |
| 357 | |
| 358 | static int consumer_stream_sync_metadata_index( |
| 359 | struct lttng_consumer_stream *stream, |
| 360 | const struct stream_subbuffer *subbuffer, |
| 361 | struct lttng_consumer_local_data *ctx) |
| 362 | { |
| 363 | int ret; |
| 364 | |
| 365 | /* Block until all the metadata is sent. */ |
| 366 | pthread_mutex_lock(&stream->metadata_timer_lock); |
| 367 | assert(!stream->missed_metadata_flush); |
| 368 | stream->waiting_on_metadata = true; |
| 369 | pthread_mutex_unlock(&stream->metadata_timer_lock); |
| 370 | |
| 371 | ret = consumer_stream_sync_metadata(ctx, stream->session_id); |
| 372 | |
| 373 | pthread_mutex_lock(&stream->metadata_timer_lock); |
| 374 | stream->waiting_on_metadata = false; |
| 375 | if (stream->missed_metadata_flush) { |
| 376 | stream->missed_metadata_flush = false; |
| 377 | pthread_mutex_unlock(&stream->metadata_timer_lock); |
| 378 | (void) stream->read_subbuffer_ops.send_live_beacon(stream); |
| 379 | } else { |
| 380 | pthread_mutex_unlock(&stream->metadata_timer_lock); |
| 381 | } |
| 382 | if (ret < 0) { |
| 383 | goto end; |
| 384 | } |
| 385 | |
| 386 | ret = consumer_stream_send_index(stream, subbuffer, ctx); |
| 387 | end: |
| 388 | return ret; |
| 389 | } |
| 390 | |
| 391 | /* |
| 392 | * Check if the local version of the metadata stream matches with the version |
| 393 | * of the metadata stream in the kernel. If it was updated, set the reset flag |
| 394 | * on the stream. |
| 395 | */ |
| 396 | static |
| 397 | int metadata_stream_check_version(struct lttng_consumer_stream *stream, |
| 398 | const struct stream_subbuffer *subbuffer) |
| 399 | { |
| 400 | if (stream->metadata_version == subbuffer->info.metadata.version) { |
| 401 | goto end; |
| 402 | } |
| 403 | |
| 404 | DBG("New metadata version detected"); |
| 405 | consumer_stream_metadata_set_version(stream, |
| 406 | subbuffer->info.metadata.version); |
| 407 | |
| 408 | if (stream->read_subbuffer_ops.reset_metadata) { |
| 409 | stream->read_subbuffer_ops.reset_metadata(stream); |
| 410 | } |
| 411 | |
| 412 | end: |
| 413 | return 0; |
| 414 | } |
| 415 | |
| 416 | struct lttng_consumer_stream *consumer_stream_create( |
| 417 | struct lttng_consumer_channel *channel, |
| 418 | uint64_t channel_key, |
| 419 | uint64_t stream_key, |
| 420 | const char *channel_name, |
| 421 | uint64_t relayd_id, |
| 422 | uint64_t session_id, |
| 423 | struct lttng_trace_chunk *trace_chunk, |
| 424 | int cpu, |
| 425 | int *alloc_ret, |
| 426 | enum consumer_channel_type type, |
| 427 | unsigned int monitor) |
| 428 | { |
| 429 | int ret; |
| 430 | struct lttng_consumer_stream *stream; |
| 431 | |
| 432 | stream = zmalloc(sizeof(*stream)); |
| 433 | if (stream == NULL) { |
| 434 | PERROR("malloc struct lttng_consumer_stream"); |
| 435 | ret = -ENOMEM; |
| 436 | goto end; |
| 437 | } |
| 438 | |
| 439 | if (trace_chunk && !lttng_trace_chunk_get(trace_chunk)) { |
| 440 | ERR("Failed to acquire trace chunk reference during the creation of a stream"); |
| 441 | ret = -1; |
| 442 | goto error; |
| 443 | } |
| 444 | |
| 445 | rcu_read_lock(); |
| 446 | stream->chan = channel; |
| 447 | stream->key = stream_key; |
| 448 | stream->trace_chunk = trace_chunk; |
| 449 | stream->out_fd = -1; |
| 450 | stream->out_fd_offset = 0; |
| 451 | stream->output_written = 0; |
| 452 | stream->net_seq_idx = relayd_id; |
| 453 | stream->session_id = session_id; |
| 454 | stream->monitor = monitor; |
| 455 | stream->endpoint_status = CONSUMER_ENDPOINT_ACTIVE; |
| 456 | stream->index_file = NULL; |
| 457 | stream->last_sequence_number = -1ULL; |
| 458 | stream->rotate_position = -1ULL; |
| 459 | pthread_mutex_init(&stream->lock, NULL); |
| 460 | pthread_mutex_init(&stream->metadata_timer_lock, NULL); |
| 461 | |
| 462 | /* If channel is the metadata, flag this stream as metadata. */ |
| 463 | if (type == CONSUMER_CHANNEL_TYPE_METADATA) { |
| 464 | stream->metadata_flag = 1; |
| 465 | /* Metadata is flat out. */ |
| 466 | strncpy(stream->name, DEFAULT_METADATA_NAME, sizeof(stream->name)); |
| 467 | /* Live rendez-vous point. */ |
| 468 | pthread_cond_init(&stream->metadata_rdv, NULL); |
| 469 | pthread_mutex_init(&stream->metadata_rdv_lock, NULL); |
| 470 | } else { |
| 471 | /* Format stream name to <channel_name>_<cpu_number> */ |
| 472 | ret = snprintf(stream->name, sizeof(stream->name), "%s_%d", |
| 473 | channel_name, cpu); |
| 474 | if (ret < 0) { |
| 475 | PERROR("snprintf stream name"); |
| 476 | goto error; |
| 477 | } |
| 478 | } |
| 479 | |
| 480 | switch (channel->output) { |
| 481 | case CONSUMER_CHANNEL_SPLICE: |
| 482 | stream->output = LTTNG_EVENT_SPLICE; |
| 483 | ret = utils_create_pipe(stream->splice_pipe); |
| 484 | if (ret < 0) { |
| 485 | goto error; |
| 486 | } |
| 487 | break; |
| 488 | case CONSUMER_CHANNEL_MMAP: |
| 489 | stream->output = LTTNG_EVENT_MMAP; |
| 490 | break; |
| 491 | default: |
| 492 | abort(); |
| 493 | } |
| 494 | |
| 495 | /* Key is always the wait_fd for streams. */ |
| 496 | lttng_ht_node_init_u64(&stream->node, stream->key); |
| 497 | |
| 498 | /* Init node per channel id key */ |
| 499 | lttng_ht_node_init_u64(&stream->node_channel_id, channel_key); |
| 500 | |
| 501 | /* Init session id node with the stream session id */ |
| 502 | lttng_ht_node_init_u64(&stream->node_session_id, stream->session_id); |
| 503 | |
| 504 | DBG3("Allocated stream %s (key %" PRIu64 ", chan_key %" PRIu64 |
| 505 | " relayd_id %" PRIu64 ", session_id %" PRIu64, |
| 506 | stream->name, stream->key, channel_key, |
| 507 | stream->net_seq_idx, stream->session_id); |
| 508 | |
| 509 | rcu_read_unlock(); |
| 510 | |
| 511 | if (type == CONSUMER_CHANNEL_TYPE_METADATA) { |
| 512 | stream->read_subbuffer_ops.lock = |
| 513 | consumer_stream_metadata_lock_all; |
| 514 | stream->read_subbuffer_ops.unlock = |
| 515 | consumer_stream_metadata_unlock_all; |
| 516 | stream->read_subbuffer_ops.pre_consume_subbuffer = |
| 517 | metadata_stream_check_version; |
| 518 | } else { |
| 519 | stream->read_subbuffer_ops.lock = consumer_stream_data_lock_all; |
| 520 | stream->read_subbuffer_ops.unlock = |
| 521 | consumer_stream_data_unlock_all; |
| 522 | stream->read_subbuffer_ops.pre_consume_subbuffer = |
| 523 | consumer_stream_update_stats; |
| 524 | if (channel->is_live) { |
| 525 | stream->read_subbuffer_ops.post_consume = |
| 526 | consumer_stream_sync_metadata_index; |
| 527 | } else { |
| 528 | stream->read_subbuffer_ops.post_consume = |
| 529 | consumer_stream_send_index; |
| 530 | } |
| 531 | } |
| 532 | |
| 533 | if (channel->output == CONSUMER_CHANNEL_MMAP) { |
| 534 | stream->read_subbuffer_ops.consume_subbuffer = |
| 535 | consumer_stream_consume_mmap; |
| 536 | } else { |
| 537 | stream->read_subbuffer_ops.consume_subbuffer = |
| 538 | consumer_stream_consume_splice; |
| 539 | } |
| 540 | |
| 541 | return stream; |
| 542 | |
| 543 | error: |
| 544 | rcu_read_unlock(); |
| 545 | lttng_trace_chunk_put(stream->trace_chunk); |
| 546 | free(stream); |
| 547 | end: |
| 548 | if (alloc_ret) { |
| 549 | *alloc_ret = ret; |
| 550 | } |
| 551 | return NULL; |
| 552 | } |
| 553 | |
| 554 | /* |
| 555 | * Close stream on the relayd side. This call can destroy a relayd if the |
| 556 | * conditions are met. |
| 557 | * |
| 558 | * A RCU read side lock MUST be acquired if the relayd object was looked up in |
| 559 | * a hash table before calling this. |
| 560 | */ |
| 561 | void consumer_stream_relayd_close(struct lttng_consumer_stream *stream, |
| 562 | struct consumer_relayd_sock_pair *relayd) |
| 563 | { |
| 564 | int ret; |
| 565 | |
| 566 | assert(stream); |
| 567 | assert(relayd); |
| 568 | |
| 569 | if (stream->sent_to_relayd) { |
| 570 | uatomic_dec(&relayd->refcount); |
| 571 | assert(uatomic_read(&relayd->refcount) >= 0); |
| 572 | } |
| 573 | |
| 574 | /* Closing streams requires to lock the control socket. */ |
| 575 | pthread_mutex_lock(&relayd->ctrl_sock_mutex); |
| 576 | ret = relayd_send_close_stream(&relayd->control_sock, |
| 577 | stream->relayd_stream_id, |
| 578 | stream->next_net_seq_num - 1); |
| 579 | pthread_mutex_unlock(&relayd->ctrl_sock_mutex); |
| 580 | if (ret < 0) { |
| 581 | ERR("Relayd send close stream failed. Cleaning up relayd %" PRIu64 ".", relayd->net_seq_idx); |
| 582 | lttng_consumer_cleanup_relayd(relayd); |
| 583 | } |
| 584 | |
| 585 | /* Both conditions are met, we destroy the relayd. */ |
| 586 | if (uatomic_read(&relayd->refcount) == 0 && |
| 587 | uatomic_read(&relayd->destroy_flag)) { |
| 588 | consumer_destroy_relayd(relayd); |
| 589 | } |
| 590 | stream->net_seq_idx = (uint64_t) -1ULL; |
| 591 | stream->sent_to_relayd = 0; |
| 592 | } |
| 593 | |
| 594 | /* |
| 595 | * Close stream's file descriptors and, if needed, close stream also on the |
| 596 | * relayd side. |
| 597 | * |
| 598 | * The consumer data lock MUST be acquired. |
| 599 | * The stream lock MUST be acquired. |
| 600 | */ |
| 601 | void consumer_stream_close(struct lttng_consumer_stream *stream) |
| 602 | { |
| 603 | int ret; |
| 604 | struct consumer_relayd_sock_pair *relayd; |
| 605 | |
| 606 | assert(stream); |
| 607 | |
| 608 | switch (consumer_data.type) { |
| 609 | case LTTNG_CONSUMER_KERNEL: |
| 610 | if (stream->mmap_base != NULL) { |
| 611 | ret = munmap(stream->mmap_base, stream->mmap_len); |
| 612 | if (ret != 0) { |
| 613 | PERROR("munmap"); |
| 614 | } |
| 615 | } |
| 616 | |
| 617 | if (stream->wait_fd >= 0) { |
| 618 | ret = close(stream->wait_fd); |
| 619 | if (ret) { |
| 620 | PERROR("close"); |
| 621 | } |
| 622 | stream->wait_fd = -1; |
| 623 | } |
| 624 | if (stream->chan->output == CONSUMER_CHANNEL_SPLICE) { |
| 625 | utils_close_pipe(stream->splice_pipe); |
| 626 | } |
| 627 | break; |
| 628 | case LTTNG_CONSUMER32_UST: |
| 629 | case LTTNG_CONSUMER64_UST: |
| 630 | { |
| 631 | /* |
| 632 | * Special case for the metadata since the wait fd is an internal pipe |
| 633 | * polled in the metadata thread. |
| 634 | */ |
| 635 | if (stream->metadata_flag && stream->chan->monitor) { |
| 636 | int rpipe = stream->ust_metadata_poll_pipe[0]; |
| 637 | |
| 638 | /* |
| 639 | * This will stop the channel timer if one and close the write side |
| 640 | * of the metadata poll pipe. |
| 641 | */ |
| 642 | lttng_ustconsumer_close_metadata(stream->chan); |
| 643 | if (rpipe >= 0) { |
| 644 | ret = close(rpipe); |
| 645 | if (ret < 0) { |
| 646 | PERROR("closing metadata pipe read side"); |
| 647 | } |
| 648 | stream->ust_metadata_poll_pipe[0] = -1; |
| 649 | } |
| 650 | } |
| 651 | break; |
| 652 | } |
| 653 | default: |
| 654 | ERR("Unknown consumer_data type"); |
| 655 | assert(0); |
| 656 | } |
| 657 | |
| 658 | /* Close output fd. Could be a socket or local file at this point. */ |
| 659 | if (stream->out_fd >= 0) { |
| 660 | ret = close(stream->out_fd); |
| 661 | if (ret) { |
| 662 | PERROR("close"); |
| 663 | } |
| 664 | stream->out_fd = -1; |
| 665 | } |
| 666 | |
| 667 | if (stream->index_file) { |
| 668 | lttng_index_file_put(stream->index_file); |
| 669 | stream->index_file = NULL; |
| 670 | } |
| 671 | |
| 672 | lttng_trace_chunk_put(stream->trace_chunk); |
| 673 | stream->trace_chunk = NULL; |
| 674 | |
| 675 | /* Check and cleanup relayd if needed. */ |
| 676 | rcu_read_lock(); |
| 677 | relayd = consumer_find_relayd(stream->net_seq_idx); |
| 678 | if (relayd != NULL) { |
| 679 | consumer_stream_relayd_close(stream, relayd); |
| 680 | } |
| 681 | rcu_read_unlock(); |
| 682 | } |
| 683 | |
| 684 | /* |
| 685 | * Delete the stream from all possible hash tables. |
| 686 | * |
| 687 | * The consumer data lock MUST be acquired. |
| 688 | * The stream lock MUST be acquired. |
| 689 | */ |
| 690 | void consumer_stream_delete(struct lttng_consumer_stream *stream, |
| 691 | struct lttng_ht *ht) |
| 692 | { |
| 693 | int ret; |
| 694 | struct lttng_ht_iter iter; |
| 695 | |
| 696 | assert(stream); |
| 697 | /* Should NEVER be called not in monitor mode. */ |
| 698 | assert(stream->chan->monitor); |
| 699 | |
| 700 | rcu_read_lock(); |
| 701 | |
| 702 | if (ht) { |
| 703 | iter.iter.node = &stream->node.node; |
| 704 | ret = lttng_ht_del(ht, &iter); |
| 705 | assert(!ret); |
| 706 | } |
| 707 | |
| 708 | /* Delete from stream per channel ID hash table. */ |
| 709 | iter.iter.node = &stream->node_channel_id.node; |
| 710 | /* |
| 711 | * The returned value is of no importance. Even if the node is NOT in the |
| 712 | * hash table, we continue since we may have been called by a code path |
| 713 | * that did not add the stream to a (all) hash table. Same goes for the |
| 714 | * next call ht del call. |
| 715 | */ |
| 716 | (void) lttng_ht_del(consumer_data.stream_per_chan_id_ht, &iter); |
| 717 | |
| 718 | /* Delete from the global stream list. */ |
| 719 | iter.iter.node = &stream->node_session_id.node; |
| 720 | /* See the previous ht del on why we ignore the returned value. */ |
| 721 | (void) lttng_ht_del(consumer_data.stream_list_ht, &iter); |
| 722 | |
| 723 | rcu_read_unlock(); |
| 724 | |
| 725 | if (!stream->metadata_flag) { |
| 726 | /* Decrement the stream count of the global consumer data. */ |
| 727 | assert(consumer_data.stream_count > 0); |
| 728 | consumer_data.stream_count--; |
| 729 | } |
| 730 | } |
| 731 | |
| 732 | /* |
| 733 | * Free the given stream within a RCU call. |
| 734 | */ |
| 735 | void consumer_stream_free(struct lttng_consumer_stream *stream) |
| 736 | { |
| 737 | assert(stream); |
| 738 | |
| 739 | metadata_bucket_destroy(stream->metadata_bucket); |
| 740 | call_rcu(&stream->node.head, free_stream_rcu); |
| 741 | } |
| 742 | |
| 743 | /* |
| 744 | * Destroy the stream's buffers of the tracer. |
| 745 | */ |
| 746 | void consumer_stream_destroy_buffers(struct lttng_consumer_stream *stream) |
| 747 | { |
| 748 | assert(stream); |
| 749 | |
| 750 | switch (consumer_data.type) { |
| 751 | case LTTNG_CONSUMER_KERNEL: |
| 752 | break; |
| 753 | case LTTNG_CONSUMER32_UST: |
| 754 | case LTTNG_CONSUMER64_UST: |
| 755 | lttng_ustconsumer_del_stream(stream); |
| 756 | break; |
| 757 | default: |
| 758 | ERR("Unknown consumer_data type"); |
| 759 | assert(0); |
| 760 | } |
| 761 | } |
| 762 | |
| 763 | /* |
| 764 | * Destroy and close a already created stream. |
| 765 | */ |
| 766 | static void destroy_close_stream(struct lttng_consumer_stream *stream) |
| 767 | { |
| 768 | assert(stream); |
| 769 | |
| 770 | DBG("Consumer stream destroy monitored key: %" PRIu64, stream->key); |
| 771 | |
| 772 | /* Destroy tracer buffers of the stream. */ |
| 773 | consumer_stream_destroy_buffers(stream); |
| 774 | /* Close down everything including the relayd if one. */ |
| 775 | consumer_stream_close(stream); |
| 776 | } |
| 777 | |
| 778 | /* |
| 779 | * Decrement the stream's channel refcount and if down to 0, return the channel |
| 780 | * pointer so it can be destroyed by the caller or NULL if not. |
| 781 | */ |
| 782 | static struct lttng_consumer_channel *unref_channel( |
| 783 | struct lttng_consumer_stream *stream) |
| 784 | { |
| 785 | struct lttng_consumer_channel *free_chan = NULL; |
| 786 | |
| 787 | assert(stream); |
| 788 | assert(stream->chan); |
| 789 | |
| 790 | /* Update refcount of channel and see if we need to destroy it. */ |
| 791 | if (!uatomic_sub_return(&stream->chan->refcount, 1) |
| 792 | && !uatomic_read(&stream->chan->nb_init_stream_left)) { |
| 793 | free_chan = stream->chan; |
| 794 | } |
| 795 | |
| 796 | return free_chan; |
| 797 | } |
| 798 | |
| 799 | /* |
| 800 | * Destroy a stream completely. This will delete, close and free the stream. |
| 801 | * Once return, the stream is NO longer usable. Its channel may get destroyed |
| 802 | * if conditions are met for a monitored stream. |
| 803 | * |
| 804 | * This MUST be called WITHOUT the consumer data and stream lock acquired if |
| 805 | * the stream is in _monitor_ mode else it does not matter. |
| 806 | */ |
| 807 | void consumer_stream_destroy(struct lttng_consumer_stream *stream, |
| 808 | struct lttng_ht *ht) |
| 809 | { |
| 810 | assert(stream); |
| 811 | |
| 812 | /* Stream is in monitor mode. */ |
| 813 | if (stream->monitor) { |
| 814 | struct lttng_consumer_channel *free_chan = NULL; |
| 815 | |
| 816 | /* |
| 817 | * This means that the stream was successfully removed from the streams |
| 818 | * list of the channel and sent to the right thread managing this |
| 819 | * stream thus being globally visible. |
| 820 | */ |
| 821 | if (stream->globally_visible) { |
| 822 | pthread_mutex_lock(&consumer_data.lock); |
| 823 | pthread_mutex_lock(&stream->chan->lock); |
| 824 | pthread_mutex_lock(&stream->lock); |
| 825 | /* Remove every reference of the stream in the consumer. */ |
| 826 | consumer_stream_delete(stream, ht); |
| 827 | |
| 828 | destroy_close_stream(stream); |
| 829 | |
| 830 | /* Update channel's refcount of the stream. */ |
| 831 | free_chan = unref_channel(stream); |
| 832 | |
| 833 | /* Indicates that the consumer data state MUST be updated after this. */ |
| 834 | consumer_data.need_update = 1; |
| 835 | |
| 836 | pthread_mutex_unlock(&stream->lock); |
| 837 | pthread_mutex_unlock(&stream->chan->lock); |
| 838 | pthread_mutex_unlock(&consumer_data.lock); |
| 839 | } else { |
| 840 | /* |
| 841 | * If the stream is not visible globally, this needs to be done |
| 842 | * outside of the consumer data lock section. |
| 843 | */ |
| 844 | free_chan = unref_channel(stream); |
| 845 | } |
| 846 | |
| 847 | if (free_chan) { |
| 848 | consumer_del_channel(free_chan); |
| 849 | } |
| 850 | } else { |
| 851 | destroy_close_stream(stream); |
| 852 | } |
| 853 | |
| 854 | /* Free stream within a RCU call. */ |
| 855 | lttng_trace_chunk_put(stream->trace_chunk); |
| 856 | stream->trace_chunk = NULL; |
| 857 | consumer_stream_free(stream); |
| 858 | } |
| 859 | |
| 860 | /* |
| 861 | * Write index of a specific stream either on the relayd or local disk. |
| 862 | * |
| 863 | * Return 0 on success or else a negative value. |
| 864 | */ |
| 865 | int consumer_stream_write_index(struct lttng_consumer_stream *stream, |
| 866 | struct ctf_packet_index *element) |
| 867 | { |
| 868 | int ret; |
| 869 | |
| 870 | assert(stream); |
| 871 | assert(element); |
| 872 | |
| 873 | rcu_read_lock(); |
| 874 | if (stream->net_seq_idx != (uint64_t) -1ULL) { |
| 875 | struct consumer_relayd_sock_pair *relayd; |
| 876 | relayd = consumer_find_relayd(stream->net_seq_idx); |
| 877 | if (relayd) { |
| 878 | pthread_mutex_lock(&relayd->ctrl_sock_mutex); |
| 879 | ret = relayd_send_index(&relayd->control_sock, element, |
| 880 | stream->relayd_stream_id, stream->next_net_seq_num - 1); |
| 881 | if (ret < 0) { |
| 882 | /* |
| 883 | * Communication error with lttng-relayd, |
| 884 | * perform cleanup now |
| 885 | */ |
| 886 | ERR("Relayd send index failed. Cleaning up relayd %" PRIu64 ".", relayd->net_seq_idx); |
| 887 | lttng_consumer_cleanup_relayd(relayd); |
| 888 | ret = -1; |
| 889 | } |
| 890 | pthread_mutex_unlock(&relayd->ctrl_sock_mutex); |
| 891 | } else { |
| 892 | ERR("Stream %" PRIu64 " relayd ID %" PRIu64 " unknown. Can't write index.", |
| 893 | stream->key, stream->net_seq_idx); |
| 894 | ret = -1; |
| 895 | } |
| 896 | } else { |
| 897 | if (lttng_index_file_write(stream->index_file, element)) { |
| 898 | ret = -1; |
| 899 | } else { |
| 900 | ret = 0; |
| 901 | } |
| 902 | } |
| 903 | if (ret < 0) { |
| 904 | goto error; |
| 905 | } |
| 906 | |
| 907 | error: |
| 908 | rcu_read_unlock(); |
| 909 | return ret; |
| 910 | } |
| 911 | |
| 912 | int consumer_stream_create_output_files(struct lttng_consumer_stream *stream, |
| 913 | bool create_index) |
| 914 | { |
| 915 | int ret; |
| 916 | enum lttng_trace_chunk_status chunk_status; |
| 917 | const int flags = O_WRONLY | O_CREAT | O_TRUNC; |
| 918 | const mode_t mode = S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP; |
| 919 | char stream_path[LTTNG_PATH_MAX]; |
| 920 | |
| 921 | ASSERT_LOCKED(stream->lock); |
| 922 | assert(stream->trace_chunk); |
| 923 | |
| 924 | ret = utils_stream_file_path(stream->chan->pathname, stream->name, |
| 925 | stream->chan->tracefile_size, |
| 926 | stream->tracefile_count_current, NULL, |
| 927 | stream_path, sizeof(stream_path)); |
| 928 | if (ret < 0) { |
| 929 | goto end; |
| 930 | } |
| 931 | |
| 932 | if (stream->out_fd >= 0) { |
| 933 | ret = close(stream->out_fd); |
| 934 | if (ret < 0) { |
| 935 | PERROR("Failed to close stream file \"%s\"", |
| 936 | stream->name); |
| 937 | goto end; |
| 938 | } |
| 939 | stream->out_fd = -1; |
| 940 | } |
| 941 | |
| 942 | DBG("Opening stream output file \"%s\"", stream_path); |
| 943 | chunk_status = lttng_trace_chunk_open_file(stream->trace_chunk, stream_path, |
| 944 | flags, mode, &stream->out_fd); |
| 945 | if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) { |
| 946 | ERR("Failed to open stream file \"%s\"", stream->name); |
| 947 | ret = -1; |
| 948 | goto end; |
| 949 | } |
| 950 | |
| 951 | if (!stream->metadata_flag && (create_index || stream->index_file)) { |
| 952 | if (stream->index_file) { |
| 953 | lttng_index_file_put(stream->index_file); |
| 954 | } |
| 955 | stream->index_file = lttng_index_file_create_from_trace_chunk( |
| 956 | stream->trace_chunk, |
| 957 | stream->chan->pathname, |
| 958 | stream->name, |
| 959 | stream->chan->tracefile_size, |
| 960 | stream->tracefile_count_current, |
| 961 | CTF_INDEX_MAJOR, CTF_INDEX_MINOR, |
| 962 | false); |
| 963 | if (!stream->index_file) { |
| 964 | ret = -1; |
| 965 | goto end; |
| 966 | } |
| 967 | } |
| 968 | |
| 969 | /* Reset current size because we just perform a rotation. */ |
| 970 | stream->tracefile_size_current = 0; |
| 971 | stream->out_fd_offset = 0; |
| 972 | end: |
| 973 | return ret; |
| 974 | } |
| 975 | |
| 976 | int consumer_stream_rotate_output_files(struct lttng_consumer_stream *stream) |
| 977 | { |
| 978 | int ret; |
| 979 | |
| 980 | stream->tracefile_count_current++; |
| 981 | if (stream->chan->tracefile_count > 0) { |
| 982 | stream->tracefile_count_current %= |
| 983 | stream->chan->tracefile_count; |
| 984 | } |
| 985 | |
| 986 | DBG("Rotating output files of stream \"%s\"", stream->name); |
| 987 | ret = consumer_stream_create_output_files(stream, true); |
| 988 | if (ret) { |
| 989 | goto end; |
| 990 | } |
| 991 | |
| 992 | end: |
| 993 | return ret; |
| 994 | } |
| 995 | |
| 996 | bool consumer_stream_is_deleted(struct lttng_consumer_stream *stream) |
| 997 | { |
| 998 | /* |
| 999 | * This function does not take a const stream since |
| 1000 | * cds_lfht_is_node_deleted was not const before liburcu 0.12. |
| 1001 | */ |
| 1002 | assert(stream); |
| 1003 | return cds_lfht_is_node_deleted(&stream->node.node); |
| 1004 | } |
| 1005 | |
| 1006 | static ssize_t metadata_bucket_flush( |
| 1007 | const struct stream_subbuffer *buffer, void *data) |
| 1008 | { |
| 1009 | ssize_t ret; |
| 1010 | struct lttng_consumer_stream *stream = data; |
| 1011 | |
| 1012 | ret = consumer_stream_consume_mmap(NULL, stream, buffer); |
| 1013 | if (ret < 0) { |
| 1014 | goto end; |
| 1015 | } |
| 1016 | end: |
| 1017 | return ret; |
| 1018 | } |
| 1019 | |
| 1020 | static ssize_t metadata_bucket_consume( |
| 1021 | struct lttng_consumer_local_data *unused, |
| 1022 | struct lttng_consumer_stream *stream, |
| 1023 | const struct stream_subbuffer *subbuffer) |
| 1024 | { |
| 1025 | ssize_t ret; |
| 1026 | enum metadata_bucket_status status; |
| 1027 | |
| 1028 | status = metadata_bucket_fill(stream->metadata_bucket, subbuffer); |
| 1029 | switch (status) { |
| 1030 | case METADATA_BUCKET_STATUS_OK: |
| 1031 | /* Return consumed size. */ |
| 1032 | ret = subbuffer->buffer.buffer.size; |
| 1033 | break; |
| 1034 | default: |
| 1035 | ret = -1; |
| 1036 | } |
| 1037 | |
| 1038 | return ret; |
| 1039 | } |
| 1040 | |
| 1041 | int consumer_stream_enable_metadata_bucketization( |
| 1042 | struct lttng_consumer_stream *stream) |
| 1043 | { |
| 1044 | int ret = 0; |
| 1045 | |
| 1046 | assert(stream->metadata_flag); |
| 1047 | assert(!stream->metadata_bucket); |
| 1048 | assert(stream->chan->output == CONSUMER_CHANNEL_MMAP); |
| 1049 | |
| 1050 | stream->metadata_bucket = metadata_bucket_create( |
| 1051 | metadata_bucket_flush, stream); |
| 1052 | if (!stream->metadata_bucket) { |
| 1053 | ret = -1; |
| 1054 | goto end; |
| 1055 | } |
| 1056 | |
| 1057 | stream->read_subbuffer_ops.consume_subbuffer = metadata_bucket_consume; |
| 1058 | end: |
| 1059 | return ret; |
| 1060 | } |
| 1061 | |
| 1062 | void consumer_stream_metadata_set_version( |
| 1063 | struct lttng_consumer_stream *stream, uint64_t new_version) |
| 1064 | { |
| 1065 | assert(new_version > stream->metadata_version); |
| 1066 | stream->metadata_version = new_version; |
| 1067 | stream->reset_metadata_flag = 1; |
| 1068 | |
| 1069 | if (stream->metadata_bucket) { |
| 1070 | metadata_bucket_reset(stream->metadata_bucket); |
| 1071 | } |
| 1072 | } |