| 1 | /* |
| 2 | * Copyright (C) 2013 Julien Desfossez <jdesfossez@efficios.com> |
| 3 | * Copyright (C) 2013 David Goulet <dgoulet@efficios.com> |
| 4 | * Copyright (C) 2015 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
| 5 | * Copyright (C) 2019 Jérémie Galarneau <jeremie.galarneau@efficios.com> |
| 6 | * |
| 7 | * SPDX-License-Identifier: GPL-2.0-only |
| 8 | * |
| 9 | */ |
| 10 | |
| 11 | #define _LGPL_SOURCE |
| 12 | #include <algorithm> |
| 13 | #include <common/common.h> |
| 14 | #include <common/defaults.h> |
| 15 | #include <common/fs-handle.h> |
| 16 | #include <common/sessiond-comm/relayd.h> |
| 17 | #include <common/utils.h> |
| 18 | #include <sys/stat.h> |
| 19 | #include <urcu/rculist.h> |
| 20 | |
| 21 | #include "lttng-relayd.h" |
| 22 | #include "index.h" |
| 23 | #include "stream.h" |
| 24 | #include "viewer-stream.h" |
| 25 | |
| 26 | #include <sys/types.h> |
| 27 | #include <fcntl.h> |
| 28 | |
| 29 | #define FILE_IO_STACK_BUFFER_SIZE 65536 |
| 30 | |
| 31 | /* Should be called with RCU read-side lock held. */ |
| 32 | bool stream_get(struct relay_stream *stream) |
| 33 | { |
| 34 | ASSERT_RCU_READ_LOCKED(); |
| 35 | |
| 36 | return urcu_ref_get_unless_zero(&stream->ref); |
| 37 | } |
| 38 | |
| 39 | /* |
| 40 | * Get stream from stream id from the streams hash table. Return stream |
| 41 | * if found else NULL. A stream reference is taken when a stream is |
| 42 | * returned. stream_put() must be called on that stream. |
| 43 | */ |
| 44 | struct relay_stream *stream_get_by_id(uint64_t stream_id) |
| 45 | { |
| 46 | struct lttng_ht_node_u64 *node; |
| 47 | struct lttng_ht_iter iter; |
| 48 | struct relay_stream *stream = NULL; |
| 49 | |
| 50 | rcu_read_lock(); |
| 51 | lttng_ht_lookup(relay_streams_ht, &stream_id, &iter); |
| 52 | node = lttng_ht_iter_get_node_u64(&iter); |
| 53 | if (!node) { |
| 54 | DBG("Relay stream %" PRIu64 " not found", stream_id); |
| 55 | goto end; |
| 56 | } |
| 57 | stream = caa_container_of(node, struct relay_stream, node); |
| 58 | if (!stream_get(stream)) { |
| 59 | stream = NULL; |
| 60 | } |
| 61 | end: |
| 62 | rcu_read_unlock(); |
| 63 | return stream; |
| 64 | } |
| 65 | |
| 66 | static void stream_complete_rotation(struct relay_stream *stream) |
| 67 | { |
| 68 | DBG("Rotation completed for stream %" PRIu64, stream->stream_handle); |
| 69 | if (stream->ongoing_rotation.value.next_trace_chunk) { |
| 70 | tracefile_array_reset(stream->tfa); |
| 71 | tracefile_array_commit_seq(stream->tfa, |
| 72 | stream->index_received_seqcount); |
| 73 | } |
| 74 | lttng_trace_chunk_put(stream->trace_chunk); |
| 75 | stream->trace_chunk = stream->ongoing_rotation.value.next_trace_chunk; |
| 76 | stream->ongoing_rotation = LTTNG_OPTIONAL_INIT_UNSET; |
| 77 | stream->completed_rotation_count++; |
| 78 | } |
| 79 | |
| 80 | static int stream_create_data_output_file_from_trace_chunk( |
| 81 | struct relay_stream *stream, |
| 82 | struct lttng_trace_chunk *trace_chunk, |
| 83 | bool force_unlink, |
| 84 | struct fs_handle **out_file) |
| 85 | { |
| 86 | int ret; |
| 87 | char stream_path[LTTNG_PATH_MAX]; |
| 88 | enum lttng_trace_chunk_status status; |
| 89 | const int flags = O_RDWR | O_CREAT | O_TRUNC; |
| 90 | const mode_t mode = S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP; |
| 91 | |
| 92 | ASSERT_LOCKED(stream->lock); |
| 93 | |
| 94 | ret = utils_stream_file_path(stream->path_name, stream->channel_name, |
| 95 | stream->tracefile_size, stream->tracefile_current_index, |
| 96 | NULL, stream_path, sizeof(stream_path)); |
| 97 | if (ret < 0) { |
| 98 | goto end; |
| 99 | } |
| 100 | |
| 101 | if (stream->tracefile_wrapped_around || force_unlink) { |
| 102 | /* |
| 103 | * The on-disk ring-buffer has wrapped around. |
| 104 | * Newly created stream files will replace existing files. Since |
| 105 | * live clients may be consuming existing files, the file about |
| 106 | * to be replaced is unlinked in order to not overwrite its |
| 107 | * content. |
| 108 | */ |
| 109 | status = (lttng_trace_chunk_status) lttng_trace_chunk_unlink_file(trace_chunk, |
| 110 | stream_path); |
| 111 | if (status != LTTNG_TRACE_CHUNK_STATUS_OK) { |
| 112 | PERROR("Failed to unlink stream file \"%s\" during trace file rotation", |
| 113 | stream_path); |
| 114 | /* |
| 115 | * Don't abort if the file doesn't exist, it is |
| 116 | * unexpected, but should not be a fatal error. |
| 117 | */ |
| 118 | if (errno != ENOENT) { |
| 119 | ret = -1; |
| 120 | goto end; |
| 121 | } |
| 122 | } |
| 123 | } |
| 124 | |
| 125 | status = lttng_trace_chunk_open_fs_handle(trace_chunk, stream_path, |
| 126 | flags, mode, out_file, false); |
| 127 | if (status != LTTNG_TRACE_CHUNK_STATUS_OK) { |
| 128 | ERR("Failed to open stream file \"%s\"", stream->channel_name); |
| 129 | ret = -1; |
| 130 | goto end; |
| 131 | } |
| 132 | end: |
| 133 | return ret; |
| 134 | } |
| 135 | |
| 136 | static int stream_rotate_data_file(struct relay_stream *stream) |
| 137 | { |
| 138 | int ret = 0; |
| 139 | |
| 140 | DBG("Rotating stream %" PRIu64 " data file with size %" PRIu64, |
| 141 | stream->stream_handle, stream->tracefile_size_current); |
| 142 | |
| 143 | if (stream->file) { |
| 144 | fs_handle_close(stream->file); |
| 145 | stream->file = NULL; |
| 146 | } |
| 147 | |
| 148 | stream->tracefile_wrapped_around = false; |
| 149 | stream->tracefile_current_index = 0; |
| 150 | |
| 151 | if (stream->ongoing_rotation.value.next_trace_chunk) { |
| 152 | enum lttng_trace_chunk_status chunk_status; |
| 153 | |
| 154 | chunk_status = lttng_trace_chunk_create_subdirectory( |
| 155 | stream->ongoing_rotation.value.next_trace_chunk, |
| 156 | stream->path_name); |
| 157 | if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) { |
| 158 | ret = -1; |
| 159 | goto end; |
| 160 | } |
| 161 | |
| 162 | /* Rotate the data file. */ |
| 163 | ret = stream_create_data_output_file_from_trace_chunk(stream, |
| 164 | stream->ongoing_rotation.value.next_trace_chunk, |
| 165 | false, &stream->file); |
| 166 | if (ret < 0) { |
| 167 | ERR("Failed to rotate stream data file"); |
| 168 | goto end; |
| 169 | } |
| 170 | } |
| 171 | DBG("%s: reset tracefile_size_current for stream %" PRIu64 " was %" PRIu64, |
| 172 | __func__, stream->stream_handle, stream->tracefile_size_current); |
| 173 | stream->tracefile_size_current = 0; |
| 174 | stream->pos_after_last_complete_data_index = 0; |
| 175 | stream->ongoing_rotation.value.data_rotated = true; |
| 176 | |
| 177 | if (stream->ongoing_rotation.value.index_rotated) { |
| 178 | /* Rotation completed; reset its state. */ |
| 179 | stream_complete_rotation(stream); |
| 180 | } |
| 181 | end: |
| 182 | return ret; |
| 183 | } |
| 184 | |
| 185 | /* |
| 186 | * If too much data has been written in a tracefile before we received the |
| 187 | * rotation command, we have to move the excess data to the new tracefile and |
| 188 | * perform the rotation. This can happen because the control and data |
| 189 | * connections are separate, the indexes as well as the commands arrive from |
| 190 | * the control connection and we have no control over the order so we could be |
| 191 | * in a situation where too much data has been received on the data connection |
| 192 | * before the rotation command on the control connection arrives. |
| 193 | */ |
| 194 | static int rotate_truncate_stream(struct relay_stream *stream) |
| 195 | { |
| 196 | int ret; |
| 197 | off_t lseek_ret, previous_stream_copy_origin; |
| 198 | uint64_t copy_bytes_left, misplaced_data_size; |
| 199 | bool acquired_reference; |
| 200 | struct fs_handle *previous_stream_file = NULL; |
| 201 | struct lttng_trace_chunk *previous_chunk = NULL; |
| 202 | |
| 203 | if (!LTTNG_OPTIONAL_GET(stream->ongoing_rotation).next_trace_chunk) { |
| 204 | ERR("Protocol error encoutered in %s(): stream rotation " |
| 205 | "sequence number is before the current sequence number " |
| 206 | "and the next trace chunk is unset. Honoring this " |
| 207 | "rotation command would result in data loss", |
| 208 | __FUNCTION__); |
| 209 | ret = -1; |
| 210 | goto end; |
| 211 | } |
| 212 | |
| 213 | ASSERT_LOCKED(stream->lock); |
| 214 | /* |
| 215 | * Acquire a reference to the current trace chunk to ensure |
| 216 | * it is not reclaimed when `stream_rotate_data_file` is called. |
| 217 | * Failing to do so would violate the contract of the trace |
| 218 | * chunk API as an active file descriptor would outlive the |
| 219 | * trace chunk. |
| 220 | */ |
| 221 | acquired_reference = lttng_trace_chunk_get(stream->trace_chunk); |
| 222 | LTTNG_ASSERT(acquired_reference); |
| 223 | previous_chunk = stream->trace_chunk; |
| 224 | |
| 225 | /* |
| 226 | * Steal the stream's reference to its stream_fd. A new |
| 227 | * stream_fd will be created when the rotation completes and |
| 228 | * the orinal stream_fd will be used to copy the "extra" data |
| 229 | * to the new file. |
| 230 | */ |
| 231 | LTTNG_ASSERT(stream->file); |
| 232 | previous_stream_file = stream->file; |
| 233 | stream->file = NULL; |
| 234 | |
| 235 | LTTNG_ASSERT(!stream->is_metadata); |
| 236 | LTTNG_ASSERT(stream->tracefile_size_current > |
| 237 | stream->pos_after_last_complete_data_index); |
| 238 | misplaced_data_size = stream->tracefile_size_current - |
| 239 | stream->pos_after_last_complete_data_index; |
| 240 | copy_bytes_left = misplaced_data_size; |
| 241 | previous_stream_copy_origin = stream->pos_after_last_complete_data_index; |
| 242 | |
| 243 | ret = stream_rotate_data_file(stream); |
| 244 | if (ret) { |
| 245 | goto end; |
| 246 | } |
| 247 | |
| 248 | LTTNG_ASSERT(stream->file); |
| 249 | /* |
| 250 | * Seek the current tracefile to the position at which the rotation |
| 251 | * should have occurred. |
| 252 | */ |
| 253 | lseek_ret = fs_handle_seek(previous_stream_file, previous_stream_copy_origin, SEEK_SET); |
| 254 | if (lseek_ret < 0) { |
| 255 | PERROR("Failed to seek to offset %" PRIu64 |
| 256 | " while copying extra data received before a stream rotation", |
| 257 | (uint64_t) previous_stream_copy_origin); |
| 258 | ret = -1; |
| 259 | goto end; |
| 260 | } |
| 261 | |
| 262 | /* Move data from the old file to the new file. */ |
| 263 | while (copy_bytes_left) { |
| 264 | ssize_t io_ret; |
| 265 | char copy_buffer[FILE_IO_STACK_BUFFER_SIZE]; |
| 266 | const off_t copy_size_this_pass = std::min<uint64_t>(copy_bytes_left, sizeof(copy_buffer)); |
| 267 | |
| 268 | io_ret = fs_handle_read(previous_stream_file, copy_buffer, |
| 269 | copy_size_this_pass); |
| 270 | if (io_ret < (ssize_t) copy_size_this_pass) { |
| 271 | if (io_ret == -1) { |
| 272 | PERROR("Failed to read %" PRIu64 |
| 273 | " bytes from previous stream file in %s(), returned %zi: stream id = %" PRIu64, |
| 274 | copy_size_this_pass, |
| 275 | __FUNCTION__, io_ret, |
| 276 | stream->stream_handle); |
| 277 | } else { |
| 278 | ERR("Failed to read %" PRIu64 |
| 279 | " bytes from previous stream file in %s(), returned %zi: stream id = %" PRIu64, |
| 280 | copy_size_this_pass, |
| 281 | __FUNCTION__, io_ret, |
| 282 | stream->stream_handle); |
| 283 | } |
| 284 | ret = -1; |
| 285 | goto end; |
| 286 | } |
| 287 | |
| 288 | io_ret = fs_handle_write( |
| 289 | stream->file, copy_buffer, copy_size_this_pass); |
| 290 | if (io_ret < (ssize_t) copy_size_this_pass) { |
| 291 | if (io_ret == -1) { |
| 292 | PERROR("Failed to write %" PRIu64 |
| 293 | " bytes from previous stream file in %s(), returned %zi: stream id = %" PRIu64, |
| 294 | copy_size_this_pass, |
| 295 | __FUNCTION__, io_ret, |
| 296 | stream->stream_handle); |
| 297 | } else { |
| 298 | ERR("Failed to write %" PRIu64 |
| 299 | " bytes from previous stream file in %s(), returned %zi: stream id = %" PRIu64, |
| 300 | copy_size_this_pass, |
| 301 | __FUNCTION__, io_ret, |
| 302 | stream->stream_handle); |
| 303 | } |
| 304 | ret = -1; |
| 305 | goto end; |
| 306 | } |
| 307 | copy_bytes_left -= copy_size_this_pass; |
| 308 | } |
| 309 | |
| 310 | /* Truncate the file to get rid of the excess data. */ |
| 311 | ret = fs_handle_truncate( |
| 312 | previous_stream_file, previous_stream_copy_origin); |
| 313 | if (ret) { |
| 314 | PERROR("Failed to truncate current stream file to offset %" PRIu64, |
| 315 | previous_stream_copy_origin); |
| 316 | goto end; |
| 317 | } |
| 318 | |
| 319 | /* |
| 320 | * Update the offset and FD of all the eventual indexes created by the |
| 321 | * data connection before the rotation command arrived. |
| 322 | */ |
| 323 | ret = relay_index_switch_all_files(stream); |
| 324 | if (ret < 0) { |
| 325 | ERR("Failed to rotate index file"); |
| 326 | goto end; |
| 327 | } |
| 328 | |
| 329 | stream->tracefile_size_current = misplaced_data_size; |
| 330 | /* Index and data contents are back in sync. */ |
| 331 | stream->pos_after_last_complete_data_index = 0; |
| 332 | ret = 0; |
| 333 | end: |
| 334 | lttng_trace_chunk_put(previous_chunk); |
| 335 | return ret; |
| 336 | } |
| 337 | |
| 338 | /* |
| 339 | * Check if a stream's data file (as opposed to index) should be rotated |
| 340 | * (for session rotation). |
| 341 | * Must be called with the stream lock held. |
| 342 | * |
| 343 | * Return 0 on success, a negative value on error. |
| 344 | */ |
| 345 | static int try_rotate_stream_data(struct relay_stream *stream) |
| 346 | { |
| 347 | int ret = 0; |
| 348 | |
| 349 | if (caa_likely(!stream->ongoing_rotation.is_set)) { |
| 350 | /* No rotation expected. */ |
| 351 | goto end; |
| 352 | } |
| 353 | |
| 354 | if (stream->ongoing_rotation.value.data_rotated) { |
| 355 | /* Rotation of the data file has already occurred. */ |
| 356 | goto end; |
| 357 | } |
| 358 | |
| 359 | DBG("%s: Stream %" PRIu64 |
| 360 | " (rotate_at_index_packet_seq_num = %" PRIu64 |
| 361 | ", rotate_at_prev_data_net_seq = %" PRIu64 |
| 362 | ", prev_data_seq = %" PRIu64 ")", |
| 363 | __func__, stream->stream_handle, |
| 364 | stream->ongoing_rotation.value.packet_seq_num, |
| 365 | stream->ongoing_rotation.value.prev_data_net_seq, |
| 366 | stream->prev_data_seq); |
| 367 | |
| 368 | if (stream->prev_data_seq == -1ULL || |
| 369 | stream->ongoing_rotation.value.prev_data_net_seq == -1ULL || |
| 370 | stream->prev_data_seq < |
| 371 | stream->ongoing_rotation.value.prev_data_net_seq) { |
| 372 | /* |
| 373 | * The next packet that will be written is not part of the next |
| 374 | * chunk yet. |
| 375 | */ |
| 376 | DBG("Stream %" PRIu64 " data not yet ready for rotation " |
| 377 | "(rotate_at_index_packet_seq_num = %" PRIu64 |
| 378 | ", rotate_at_prev_data_net_seq = %" PRIu64 |
| 379 | ", prev_data_seq = %" PRIu64 ")", |
| 380 | stream->stream_handle, |
| 381 | stream->ongoing_rotation.value.packet_seq_num, |
| 382 | stream->ongoing_rotation.value.prev_data_net_seq, |
| 383 | stream->prev_data_seq); |
| 384 | goto end; |
| 385 | } else if (stream->prev_data_seq > stream->ongoing_rotation.value.prev_data_net_seq) { |
| 386 | /* |
| 387 | * prev_data_seq is checked here since indexes and rotation |
| 388 | * commands are serialized with respect to each other. |
| 389 | */ |
| 390 | DBG("Rotation after too much data has been written in tracefile " |
| 391 | "for stream %" PRIu64 ", need to truncate before " |
| 392 | "rotating", stream->stream_handle); |
| 393 | ret = rotate_truncate_stream(stream); |
| 394 | if (ret) { |
| 395 | ERR("Failed to truncate stream"); |
| 396 | goto end; |
| 397 | } |
| 398 | } else { |
| 399 | ret = stream_rotate_data_file(stream); |
| 400 | } |
| 401 | |
| 402 | end: |
| 403 | return ret; |
| 404 | } |
| 405 | |
| 406 | /* |
| 407 | * Close the current index file if it is open, and create a new one. |
| 408 | * |
| 409 | * Return 0 on success, -1 on error. |
| 410 | */ |
| 411 | static int create_index_file(struct relay_stream *stream, |
| 412 | struct lttng_trace_chunk *chunk) |
| 413 | { |
| 414 | int ret; |
| 415 | uint32_t major, minor; |
| 416 | char *index_subpath = NULL; |
| 417 | enum lttng_trace_chunk_status status; |
| 418 | |
| 419 | ASSERT_LOCKED(stream->lock); |
| 420 | |
| 421 | /* Put ref on previous index_file. */ |
| 422 | if (stream->index_file) { |
| 423 | lttng_index_file_put(stream->index_file); |
| 424 | stream->index_file = NULL; |
| 425 | } |
| 426 | major = stream->trace->session->major; |
| 427 | minor = stream->trace->session->minor; |
| 428 | |
| 429 | if (!chunk) { |
| 430 | ret = 0; |
| 431 | goto end; |
| 432 | } |
| 433 | ret = asprintf(&index_subpath, "%s/%s", stream->path_name, |
| 434 | DEFAULT_INDEX_DIR); |
| 435 | if (ret < 0) { |
| 436 | goto end; |
| 437 | } |
| 438 | |
| 439 | status = lttng_trace_chunk_create_subdirectory(chunk, |
| 440 | index_subpath); |
| 441 | free(index_subpath); |
| 442 | if (status != LTTNG_TRACE_CHUNK_STATUS_OK) { |
| 443 | ret = -1; |
| 444 | goto end; |
| 445 | } |
| 446 | status = lttng_index_file_create_from_trace_chunk( |
| 447 | chunk, stream->path_name, |
| 448 | stream->channel_name, stream->tracefile_size, |
| 449 | stream->tracefile_current_index, |
| 450 | lttng_to_index_major(major, minor), |
| 451 | lttng_to_index_minor(major, minor), true, |
| 452 | &stream->index_file); |
| 453 | if (status != LTTNG_TRACE_CHUNK_STATUS_OK) { |
| 454 | ret = -1; |
| 455 | goto end; |
| 456 | } |
| 457 | |
| 458 | ret = 0; |
| 459 | |
| 460 | end: |
| 461 | return ret; |
| 462 | } |
| 463 | |
| 464 | /* |
| 465 | * Check if a stream's index file should be rotated (for session rotation). |
| 466 | * Must be called with the stream lock held. |
| 467 | * |
| 468 | * Return 0 on success, a negative value on error. |
| 469 | */ |
| 470 | static int try_rotate_stream_index(struct relay_stream *stream) |
| 471 | { |
| 472 | int ret = 0; |
| 473 | |
| 474 | if (!stream->ongoing_rotation.is_set) { |
| 475 | /* No rotation expected. */ |
| 476 | goto end; |
| 477 | } |
| 478 | |
| 479 | if (stream->ongoing_rotation.value.index_rotated) { |
| 480 | /* Rotation of the index has already occurred. */ |
| 481 | goto end; |
| 482 | } |
| 483 | |
| 484 | DBG("%s: Stream %" PRIu64 |
| 485 | " (rotate_at_packet_seq_num = %" PRIu64 |
| 486 | ", received_packet_seq_num = " |
| 487 | "(value = %" PRIu64 ", is_set = %" PRIu8 "))", |
| 488 | __func__, stream->stream_handle, |
| 489 | stream->ongoing_rotation.value.packet_seq_num, |
| 490 | stream->received_packet_seq_num.value, |
| 491 | stream->received_packet_seq_num.is_set); |
| 492 | |
| 493 | if (!stream->received_packet_seq_num.is_set || |
| 494 | LTTNG_OPTIONAL_GET(stream->received_packet_seq_num) + 1 < |
| 495 | stream->ongoing_rotation.value.packet_seq_num) { |
| 496 | DBG("Stream %" PRIu64 " index not yet ready for rotation " |
| 497 | "(rotate_at_packet_seq_num = %" PRIu64 |
| 498 | ", received_packet_seq_num = " |
| 499 | "(value = %" PRIu64 ", is_set = %" PRIu8 "))", |
| 500 | stream->stream_handle, |
| 501 | stream->ongoing_rotation.value.packet_seq_num, |
| 502 | stream->received_packet_seq_num.value, |
| 503 | stream->received_packet_seq_num.is_set); |
| 504 | goto end; |
| 505 | } else { |
| 506 | /* |
| 507 | * The next index belongs to the new trace chunk; rotate. |
| 508 | * In overwrite mode, the packet seq num may jump over the |
| 509 | * rotation position. |
| 510 | */ |
| 511 | LTTNG_ASSERT(LTTNG_OPTIONAL_GET(stream->received_packet_seq_num) + 1 >= |
| 512 | stream->ongoing_rotation.value.packet_seq_num); |
| 513 | DBG("Rotating stream %" PRIu64 " index file", |
| 514 | stream->stream_handle); |
| 515 | if (stream->index_file) { |
| 516 | lttng_index_file_put(stream->index_file); |
| 517 | stream->index_file = NULL; |
| 518 | } |
| 519 | stream->ongoing_rotation.value.index_rotated = true; |
| 520 | |
| 521 | /* |
| 522 | * Set the rotation pivot position for the data, now that we have the |
| 523 | * net_seq_num matching the packet_seq_num index pivot position. |
| 524 | */ |
| 525 | stream->ongoing_rotation.value.prev_data_net_seq = |
| 526 | stream->prev_index_seq; |
| 527 | if (stream->ongoing_rotation.value.data_rotated && |
| 528 | stream->ongoing_rotation.value.index_rotated) { |
| 529 | /* Rotation completed; reset its state. */ |
| 530 | DBG("Rotation completed for stream %" PRIu64, |
| 531 | stream->stream_handle); |
| 532 | stream_complete_rotation(stream); |
| 533 | } |
| 534 | } |
| 535 | |
| 536 | end: |
| 537 | return ret; |
| 538 | } |
| 539 | |
| 540 | static int stream_set_trace_chunk(struct relay_stream *stream, |
| 541 | struct lttng_trace_chunk *chunk) |
| 542 | { |
| 543 | int ret = 0; |
| 544 | enum lttng_trace_chunk_status status; |
| 545 | bool acquired_reference; |
| 546 | |
| 547 | status = lttng_trace_chunk_create_subdirectory(chunk, |
| 548 | stream->path_name); |
| 549 | if (status != LTTNG_TRACE_CHUNK_STATUS_OK) { |
| 550 | ret = -1; |
| 551 | goto end; |
| 552 | } |
| 553 | |
| 554 | lttng_trace_chunk_put(stream->trace_chunk); |
| 555 | acquired_reference = lttng_trace_chunk_get(chunk); |
| 556 | LTTNG_ASSERT(acquired_reference); |
| 557 | stream->trace_chunk = chunk; |
| 558 | |
| 559 | if (stream->file) { |
| 560 | fs_handle_close(stream->file); |
| 561 | stream->file = NULL; |
| 562 | } |
| 563 | ret = stream_create_data_output_file_from_trace_chunk(stream, chunk, |
| 564 | false, &stream->file); |
| 565 | end: |
| 566 | return ret; |
| 567 | } |
| 568 | |
| 569 | /* |
| 570 | * We keep ownership of path_name and channel_name. |
| 571 | */ |
| 572 | struct relay_stream *stream_create(struct ctf_trace *trace, |
| 573 | uint64_t stream_handle, char *path_name, |
| 574 | char *channel_name, uint64_t tracefile_size, |
| 575 | uint64_t tracefile_count) |
| 576 | { |
| 577 | int ret; |
| 578 | struct relay_stream *stream = NULL; |
| 579 | struct relay_session *session = trace->session; |
| 580 | bool acquired_reference = false; |
| 581 | struct lttng_trace_chunk *current_trace_chunk; |
| 582 | |
| 583 | stream = (relay_stream *) zmalloc(sizeof(struct relay_stream)); |
| 584 | if (stream == NULL) { |
| 585 | PERROR("relay stream zmalloc"); |
| 586 | goto error_no_alloc; |
| 587 | } |
| 588 | |
| 589 | stream->stream_handle = stream_handle; |
| 590 | stream->prev_data_seq = -1ULL; |
| 591 | stream->prev_index_seq = -1ULL; |
| 592 | stream->last_net_seq_num = -1ULL; |
| 593 | stream->ctf_stream_id = -1ULL; |
| 594 | stream->tracefile_size = tracefile_size; |
| 595 | stream->tracefile_count = tracefile_count; |
| 596 | stream->path_name = path_name; |
| 597 | stream->channel_name = channel_name; |
| 598 | stream->beacon_ts_end = -1ULL; |
| 599 | lttng_ht_node_init_u64(&stream->node, stream->stream_handle); |
| 600 | pthread_mutex_init(&stream->lock, NULL); |
| 601 | urcu_ref_init(&stream->ref); |
| 602 | ctf_trace_get(trace); |
| 603 | stream->trace = trace; |
| 604 | |
| 605 | pthread_mutex_lock(&trace->session->lock); |
| 606 | current_trace_chunk = trace->session->current_trace_chunk; |
| 607 | if (current_trace_chunk) { |
| 608 | acquired_reference = lttng_trace_chunk_get(current_trace_chunk); |
| 609 | } |
| 610 | pthread_mutex_unlock(&trace->session->lock); |
| 611 | if (!acquired_reference) { |
| 612 | ERR("Cannot create stream for channel \"%s\" as a reference to the session's current trace chunk could not be acquired", |
| 613 | channel_name); |
| 614 | ret = -1; |
| 615 | goto end; |
| 616 | } |
| 617 | |
| 618 | stream->indexes_ht = lttng_ht_new(0, LTTNG_HT_TYPE_U64); |
| 619 | if (!stream->indexes_ht) { |
| 620 | ERR("Cannot created indexes_ht"); |
| 621 | ret = -1; |
| 622 | goto end; |
| 623 | } |
| 624 | |
| 625 | pthread_mutex_lock(&stream->lock); |
| 626 | ret = stream_set_trace_chunk(stream, current_trace_chunk); |
| 627 | pthread_mutex_unlock(&stream->lock); |
| 628 | if (ret) { |
| 629 | ERR("Failed to set the current trace chunk of session \"%s\" on newly created stream of channel \"%s\"", |
| 630 | trace->session->session_name, |
| 631 | stream->channel_name); |
| 632 | ret = -1; |
| 633 | goto end; |
| 634 | } |
| 635 | stream->tfa = tracefile_array_create(stream->tracefile_count); |
| 636 | if (!stream->tfa) { |
| 637 | ret = -1; |
| 638 | goto end; |
| 639 | } |
| 640 | |
| 641 | stream->is_metadata = !strcmp(stream->channel_name, |
| 642 | DEFAULT_METADATA_NAME); |
| 643 | stream->in_recv_list = true; |
| 644 | |
| 645 | /* |
| 646 | * Add the stream in the recv list of the session. Once the end stream |
| 647 | * message is received, all session streams are published. |
| 648 | */ |
| 649 | pthread_mutex_lock(&session->recv_list_lock); |
| 650 | cds_list_add_rcu(&stream->recv_node, &session->recv_list); |
| 651 | session->stream_count++; |
| 652 | pthread_mutex_unlock(&session->recv_list_lock); |
| 653 | |
| 654 | /* |
| 655 | * Both in the ctf_trace object and the global stream ht since the data |
| 656 | * side of the relayd does not have the concept of session. |
| 657 | */ |
| 658 | lttng_ht_add_unique_u64(relay_streams_ht, &stream->node); |
| 659 | stream->in_stream_ht = true; |
| 660 | |
| 661 | DBG("Relay new stream added %s with ID %" PRIu64, stream->channel_name, |
| 662 | stream->stream_handle); |
| 663 | ret = 0; |
| 664 | |
| 665 | end: |
| 666 | if (ret) { |
| 667 | if (stream->file) { |
| 668 | fs_handle_close(stream->file); |
| 669 | stream->file = NULL; |
| 670 | } |
| 671 | stream_put(stream); |
| 672 | stream = NULL; |
| 673 | } |
| 674 | if (acquired_reference) { |
| 675 | lttng_trace_chunk_put(current_trace_chunk); |
| 676 | } |
| 677 | return stream; |
| 678 | |
| 679 | error_no_alloc: |
| 680 | /* |
| 681 | * path_name and channel_name need to be freed explicitly here |
| 682 | * because we cannot rely on stream_put(). |
| 683 | */ |
| 684 | free(path_name); |
| 685 | free(channel_name); |
| 686 | return NULL; |
| 687 | } |
| 688 | |
| 689 | /* |
| 690 | * Called with the session lock held. |
| 691 | */ |
| 692 | void stream_publish(struct relay_stream *stream) |
| 693 | { |
| 694 | struct relay_session *session; |
| 695 | |
| 696 | pthread_mutex_lock(&stream->lock); |
| 697 | if (stream->published) { |
| 698 | goto unlock; |
| 699 | } |
| 700 | |
| 701 | session = stream->trace->session; |
| 702 | |
| 703 | pthread_mutex_lock(&session->recv_list_lock); |
| 704 | if (stream->in_recv_list) { |
| 705 | cds_list_del_rcu(&stream->recv_node); |
| 706 | stream->in_recv_list = false; |
| 707 | } |
| 708 | pthread_mutex_unlock(&session->recv_list_lock); |
| 709 | |
| 710 | pthread_mutex_lock(&stream->trace->stream_list_lock); |
| 711 | cds_list_add_rcu(&stream->stream_node, &stream->trace->stream_list); |
| 712 | pthread_mutex_unlock(&stream->trace->stream_list_lock); |
| 713 | |
| 714 | stream->published = true; |
| 715 | unlock: |
| 716 | pthread_mutex_unlock(&stream->lock); |
| 717 | } |
| 718 | |
| 719 | /* |
| 720 | * Stream must be protected by holding the stream lock or by virtue of being |
| 721 | * called from stream_destroy. |
| 722 | */ |
| 723 | static void stream_unpublish(struct relay_stream *stream) |
| 724 | { |
| 725 | if (stream->in_stream_ht) { |
| 726 | struct lttng_ht_iter iter; |
| 727 | int ret; |
| 728 | |
| 729 | iter.iter.node = &stream->node.node; |
| 730 | ret = lttng_ht_del(relay_streams_ht, &iter); |
| 731 | LTTNG_ASSERT(!ret); |
| 732 | stream->in_stream_ht = false; |
| 733 | } |
| 734 | if (stream->published) { |
| 735 | pthread_mutex_lock(&stream->trace->stream_list_lock); |
| 736 | cds_list_del_rcu(&stream->stream_node); |
| 737 | pthread_mutex_unlock(&stream->trace->stream_list_lock); |
| 738 | stream->published = false; |
| 739 | } |
| 740 | } |
| 741 | |
| 742 | static void stream_destroy(struct relay_stream *stream) |
| 743 | { |
| 744 | if (stream->indexes_ht) { |
| 745 | /* |
| 746 | * Calling lttng_ht_destroy in call_rcu worker thread so |
| 747 | * we don't hold the RCU read-side lock while calling |
| 748 | * it. |
| 749 | */ |
| 750 | lttng_ht_destroy(stream->indexes_ht); |
| 751 | } |
| 752 | if (stream->tfa) { |
| 753 | tracefile_array_destroy(stream->tfa); |
| 754 | } |
| 755 | free(stream->path_name); |
| 756 | free(stream->channel_name); |
| 757 | free(stream); |
| 758 | } |
| 759 | |
| 760 | static void stream_destroy_rcu(struct rcu_head *rcu_head) |
| 761 | { |
| 762 | struct relay_stream *stream = |
| 763 | caa_container_of(rcu_head, struct relay_stream, rcu_node); |
| 764 | |
| 765 | stream_destroy(stream); |
| 766 | } |
| 767 | |
| 768 | /* |
| 769 | * No need to take stream->lock since this is only called on the final |
| 770 | * stream_put which ensures that a single thread may act on the stream. |
| 771 | */ |
| 772 | static void stream_release(struct urcu_ref *ref) |
| 773 | { |
| 774 | struct relay_stream *stream = |
| 775 | caa_container_of(ref, struct relay_stream, ref); |
| 776 | struct relay_session *session; |
| 777 | |
| 778 | session = stream->trace->session; |
| 779 | |
| 780 | DBG("Releasing stream id %" PRIu64, stream->stream_handle); |
| 781 | |
| 782 | pthread_mutex_lock(&session->recv_list_lock); |
| 783 | session->stream_count--; |
| 784 | if (stream->in_recv_list) { |
| 785 | cds_list_del_rcu(&stream->recv_node); |
| 786 | stream->in_recv_list = false; |
| 787 | } |
| 788 | pthread_mutex_unlock(&session->recv_list_lock); |
| 789 | |
| 790 | stream_unpublish(stream); |
| 791 | |
| 792 | if (stream->file) { |
| 793 | fs_handle_close(stream->file); |
| 794 | stream->file = NULL; |
| 795 | } |
| 796 | if (stream->index_file) { |
| 797 | lttng_index_file_put(stream->index_file); |
| 798 | stream->index_file = NULL; |
| 799 | } |
| 800 | if (stream->trace) { |
| 801 | ctf_trace_put(stream->trace); |
| 802 | stream->trace = NULL; |
| 803 | } |
| 804 | stream_complete_rotation(stream); |
| 805 | lttng_trace_chunk_put(stream->trace_chunk); |
| 806 | stream->trace_chunk = NULL; |
| 807 | |
| 808 | call_rcu(&stream->rcu_node, stream_destroy_rcu); |
| 809 | } |
| 810 | |
| 811 | void stream_put(struct relay_stream *stream) |
| 812 | { |
| 813 | rcu_read_lock(); |
| 814 | LTTNG_ASSERT(stream->ref.refcount != 0); |
| 815 | /* |
| 816 | * Wait until we have processed all the stream packets before |
| 817 | * actually putting our last stream reference. |
| 818 | */ |
| 819 | urcu_ref_put(&stream->ref, stream_release); |
| 820 | rcu_read_unlock(); |
| 821 | } |
| 822 | |
| 823 | int stream_set_pending_rotation(struct relay_stream *stream, |
| 824 | struct lttng_trace_chunk *next_trace_chunk, |
| 825 | uint64_t rotation_sequence_number) |
| 826 | { |
| 827 | int ret = 0; |
| 828 | const struct relay_stream_rotation rotation = { |
| 829 | .data_rotated = false, |
| 830 | .index_rotated = false, |
| 831 | .packet_seq_num = rotation_sequence_number, |
| 832 | .prev_data_net_seq = -1ULL, |
| 833 | .next_trace_chunk = next_trace_chunk, |
| 834 | }; |
| 835 | |
| 836 | if (stream->ongoing_rotation.is_set) { |
| 837 | ERR("Attempted to set a pending rotation on a stream already being rotated (protocol error)"); |
| 838 | ret = -1; |
| 839 | goto end; |
| 840 | } |
| 841 | |
| 842 | if (next_trace_chunk) { |
| 843 | const bool reference_acquired = |
| 844 | lttng_trace_chunk_get(next_trace_chunk); |
| 845 | |
| 846 | LTTNG_ASSERT(reference_acquired); |
| 847 | } |
| 848 | LTTNG_OPTIONAL_SET(&stream->ongoing_rotation, rotation); |
| 849 | |
| 850 | DBG("Setting pending rotation: stream_id = %" PRIu64 |
| 851 | ", rotate_at_packet_seq_num = %" PRIu64, |
| 852 | stream->stream_handle, rotation_sequence_number); |
| 853 | if (stream->is_metadata) { |
| 854 | /* |
| 855 | * A metadata stream has no index; consider it already rotated. |
| 856 | */ |
| 857 | stream->ongoing_rotation.value.index_rotated = true; |
| 858 | if (next_trace_chunk) { |
| 859 | /* |
| 860 | * The metadata will be received again in the new chunk. |
| 861 | */ |
| 862 | stream->metadata_received = 0; |
| 863 | } |
| 864 | ret = stream_rotate_data_file(stream); |
| 865 | } else { |
| 866 | ret = try_rotate_stream_index(stream); |
| 867 | if (ret < 0) { |
| 868 | goto end; |
| 869 | } |
| 870 | |
| 871 | ret = try_rotate_stream_data(stream); |
| 872 | if (ret < 0) { |
| 873 | goto end; |
| 874 | } |
| 875 | } |
| 876 | end: |
| 877 | return ret; |
| 878 | } |
| 879 | |
| 880 | void try_stream_close(struct relay_stream *stream) |
| 881 | { |
| 882 | bool session_aborted; |
| 883 | struct relay_session *session = stream->trace->session; |
| 884 | |
| 885 | DBG("Trying to close stream %" PRIu64, stream->stream_handle); |
| 886 | |
| 887 | pthread_mutex_lock(&session->lock); |
| 888 | session_aborted = session->aborted; |
| 889 | pthread_mutex_unlock(&session->lock); |
| 890 | |
| 891 | pthread_mutex_lock(&stream->lock); |
| 892 | /* |
| 893 | * Can be called concurently by connection close and reception of last |
| 894 | * pending data. |
| 895 | */ |
| 896 | if (stream->closed) { |
| 897 | pthread_mutex_unlock(&stream->lock); |
| 898 | DBG("closing stream %" PRIu64 " aborted since it is already marked as closed", stream->stream_handle); |
| 899 | return; |
| 900 | } |
| 901 | |
| 902 | stream->close_requested = true; |
| 903 | |
| 904 | if (stream->last_net_seq_num == -1ULL) { |
| 905 | /* |
| 906 | * Handle connection close without explicit stream close |
| 907 | * command. |
| 908 | * |
| 909 | * We can be clever about indexes partially received in |
| 910 | * cases where we received the data socket part, but not |
| 911 | * the control socket part: since we're currently closing |
| 912 | * the stream on behalf of the control socket, we *know* |
| 913 | * there won't be any more control information for this |
| 914 | * socket. Therefore, we can destroy all indexes for |
| 915 | * which we have received only the file descriptor (from |
| 916 | * data socket). This takes care of consumerd crashes |
| 917 | * between sending the data and control information for |
| 918 | * a packet. Since those are sent in that order, we take |
| 919 | * care of consumerd crashes. |
| 920 | */ |
| 921 | DBG("relay_index_close_partial_fd"); |
| 922 | relay_index_close_partial_fd(stream); |
| 923 | /* |
| 924 | * Use the highest net_seq_num we currently have pending |
| 925 | * As end of stream indicator. Leave last_net_seq_num |
| 926 | * at -1ULL if we cannot find any index. |
| 927 | */ |
| 928 | stream->last_net_seq_num = relay_index_find_last(stream); |
| 929 | DBG("Updating stream->last_net_seq_num to %" PRIu64, stream->last_net_seq_num); |
| 930 | /* Fall-through into the next check. */ |
| 931 | } |
| 932 | |
| 933 | if (stream->last_net_seq_num != -1ULL && |
| 934 | ((int64_t) (stream->prev_data_seq - stream->last_net_seq_num)) < 0 |
| 935 | && !session_aborted) { |
| 936 | /* |
| 937 | * Don't close since we still have data pending. This |
| 938 | * handles cases where an explicit close command has |
| 939 | * been received for this stream, and cases where the |
| 940 | * connection has been closed, and we are awaiting for |
| 941 | * index information from the data socket. It is |
| 942 | * therefore expected that all the index fd information |
| 943 | * we need has already been received on the control |
| 944 | * socket. Matching index information from data socket |
| 945 | * should be Expected Soon(TM). |
| 946 | * |
| 947 | * TODO: We should implement a timer to garbage collect |
| 948 | * streams after a timeout to be resilient against a |
| 949 | * consumerd implementation that would not match this |
| 950 | * expected behavior. |
| 951 | */ |
| 952 | pthread_mutex_unlock(&stream->lock); |
| 953 | DBG("closing stream %" PRIu64 " aborted since it still has data pending", stream->stream_handle); |
| 954 | return; |
| 955 | } |
| 956 | /* |
| 957 | * We received all the indexes we can expect. |
| 958 | */ |
| 959 | stream_unpublish(stream); |
| 960 | stream->closed = true; |
| 961 | /* Relay indexes are only used by the "consumer/sessiond" end. */ |
| 962 | relay_index_close_all(stream); |
| 963 | |
| 964 | /* |
| 965 | * If we are closed by an application exiting (per-pid buffers), |
| 966 | * we need to put our reference on the stream trace chunk right |
| 967 | * away, because otherwise still holding the reference on the |
| 968 | * trace chunk could allow a viewer stream (which holds a reference |
| 969 | * to the stream) to postpone destroy waiting for the chunk to cease |
| 970 | * to exist endlessly until the viewer is detached. |
| 971 | */ |
| 972 | |
| 973 | /* Put stream fd before put chunk. */ |
| 974 | if (stream->file) { |
| 975 | fs_handle_close(stream->file); |
| 976 | stream->file = NULL; |
| 977 | } |
| 978 | if (stream->index_file) { |
| 979 | lttng_index_file_put(stream->index_file); |
| 980 | stream->index_file = NULL; |
| 981 | } |
| 982 | lttng_trace_chunk_put(stream->trace_chunk); |
| 983 | stream->trace_chunk = NULL; |
| 984 | pthread_mutex_unlock(&stream->lock); |
| 985 | DBG("Succeeded in closing stream %" PRIu64, stream->stream_handle); |
| 986 | stream_put(stream); |
| 987 | } |
| 988 | |
| 989 | int stream_init_packet(struct relay_stream *stream, size_t packet_size, |
| 990 | bool *file_rotated) |
| 991 | { |
| 992 | int ret = 0; |
| 993 | |
| 994 | ASSERT_LOCKED(stream->lock); |
| 995 | |
| 996 | if (!stream->file || !stream->trace_chunk) { |
| 997 | ERR("Protocol error: received a packet for a stream that doesn't have a current trace chunk: stream_id = %" PRIu64 ", channel_name = %s", |
| 998 | stream->stream_handle, stream->channel_name); |
| 999 | ret = -1; |
| 1000 | goto end; |
| 1001 | } |
| 1002 | |
| 1003 | if (caa_likely(stream->tracefile_size == 0)) { |
| 1004 | /* No size limit set; nothing to check. */ |
| 1005 | goto end; |
| 1006 | } |
| 1007 | |
| 1008 | /* |
| 1009 | * Check if writing the new packet would exceed the maximal file size. |
| 1010 | */ |
| 1011 | if (caa_unlikely((stream->tracefile_size_current + packet_size) > |
| 1012 | stream->tracefile_size)) { |
| 1013 | const uint64_t new_file_index = |
| 1014 | (stream->tracefile_current_index + 1) % |
| 1015 | stream->tracefile_count; |
| 1016 | |
| 1017 | if (new_file_index < stream->tracefile_current_index) { |
| 1018 | stream->tracefile_wrapped_around = true; |
| 1019 | } |
| 1020 | DBG("New stream packet causes stream file rotation: stream_id = %" PRIu64 |
| 1021 | ", current_file_size = %" PRIu64 |
| 1022 | ", packet_size = %zu, current_file_index = %" PRIu64 |
| 1023 | " new_file_index = %" PRIu64, |
| 1024 | stream->stream_handle, |
| 1025 | stream->tracefile_size_current, packet_size, |
| 1026 | stream->tracefile_current_index, new_file_index); |
| 1027 | tracefile_array_file_rotate(stream->tfa, TRACEFILE_ROTATE_WRITE); |
| 1028 | stream->tracefile_current_index = new_file_index; |
| 1029 | |
| 1030 | if (stream->file) { |
| 1031 | fs_handle_close(stream->file); |
| 1032 | stream->file = NULL; |
| 1033 | } |
| 1034 | ret = stream_create_data_output_file_from_trace_chunk(stream, |
| 1035 | stream->trace_chunk, false, &stream->file); |
| 1036 | if (ret) { |
| 1037 | ERR("Failed to perform trace file rotation of stream %" PRIu64, |
| 1038 | stream->stream_handle); |
| 1039 | goto end; |
| 1040 | } |
| 1041 | |
| 1042 | /* |
| 1043 | * Reset current size because we just performed a stream |
| 1044 | * rotation. |
| 1045 | */ |
| 1046 | DBG("%s: reset tracefile_size_current for stream %" PRIu64 " was %" PRIu64, |
| 1047 | __func__, stream->stream_handle, stream->tracefile_size_current); |
| 1048 | stream->tracefile_size_current = 0; |
| 1049 | *file_rotated = true; |
| 1050 | } else { |
| 1051 | *file_rotated = false; |
| 1052 | } |
| 1053 | end: |
| 1054 | return ret; |
| 1055 | } |
| 1056 | |
| 1057 | /* Note that the packet is not necessarily complete. */ |
| 1058 | int stream_write(struct relay_stream *stream, |
| 1059 | const struct lttng_buffer_view *packet, size_t padding_len) |
| 1060 | { |
| 1061 | int ret = 0; |
| 1062 | ssize_t write_ret; |
| 1063 | size_t padding_to_write = padding_len; |
| 1064 | char padding_buffer[FILE_IO_STACK_BUFFER_SIZE]; |
| 1065 | |
| 1066 | ASSERT_LOCKED(stream->lock); |
| 1067 | memset(padding_buffer, 0, |
| 1068 | std::min(sizeof(padding_buffer), padding_to_write)); |
| 1069 | |
| 1070 | if (!stream->file || !stream->trace_chunk) { |
| 1071 | ERR("Protocol error: received a packet for a stream that doesn't have a current trace chunk: stream_id = %" PRIu64 ", channel_name = %s", |
| 1072 | stream->stream_handle, stream->channel_name); |
| 1073 | ret = -1; |
| 1074 | goto end; |
| 1075 | } |
| 1076 | if (packet) { |
| 1077 | write_ret = fs_handle_write( |
| 1078 | stream->file, packet->data, packet->size); |
| 1079 | if (write_ret != packet->size) { |
| 1080 | PERROR("Failed to write to stream file of %sstream %" PRIu64, |
| 1081 | stream->is_metadata ? "metadata " : "", |
| 1082 | stream->stream_handle); |
| 1083 | ret = -1; |
| 1084 | goto end; |
| 1085 | } |
| 1086 | } |
| 1087 | |
| 1088 | while (padding_to_write > 0) { |
| 1089 | const size_t padding_to_write_this_pass = |
| 1090 | std::min(padding_to_write, sizeof(padding_buffer)); |
| 1091 | |
| 1092 | write_ret = fs_handle_write(stream->file, padding_buffer, |
| 1093 | padding_to_write_this_pass); |
| 1094 | if (write_ret != padding_to_write_this_pass) { |
| 1095 | PERROR("Failed to write padding to file of %sstream %" PRIu64, |
| 1096 | stream->is_metadata ? "metadata " : "", |
| 1097 | stream->stream_handle); |
| 1098 | ret = -1; |
| 1099 | goto end; |
| 1100 | } |
| 1101 | padding_to_write -= padding_to_write_this_pass; |
| 1102 | } |
| 1103 | |
| 1104 | if (stream->is_metadata) { |
| 1105 | size_t recv_len; |
| 1106 | |
| 1107 | recv_len = packet ? packet->size : 0; |
| 1108 | recv_len += padding_len; |
| 1109 | stream->metadata_received += recv_len; |
| 1110 | if (recv_len) { |
| 1111 | stream->no_new_metadata_notified = false; |
| 1112 | } |
| 1113 | } |
| 1114 | |
| 1115 | DBG("Wrote to %sstream %" PRIu64 ": data_length = %zu, padding_length = %zu", |
| 1116 | stream->is_metadata ? "metadata " : "", |
| 1117 | stream->stream_handle, |
| 1118 | packet ? packet->size : (size_t) 0, padding_len); |
| 1119 | end: |
| 1120 | return ret; |
| 1121 | } |
| 1122 | |
| 1123 | /* |
| 1124 | * Update index after receiving a packet for a data stream. |
| 1125 | * |
| 1126 | * Called with the stream lock held. |
| 1127 | * |
| 1128 | * Return 0 on success else a negative value. |
| 1129 | */ |
| 1130 | int stream_update_index(struct relay_stream *stream, uint64_t net_seq_num, |
| 1131 | bool rotate_index, bool *flushed, uint64_t total_size) |
| 1132 | { |
| 1133 | int ret = 0; |
| 1134 | uint64_t data_offset; |
| 1135 | struct relay_index *index; |
| 1136 | |
| 1137 | LTTNG_ASSERT(stream->trace_chunk); |
| 1138 | ASSERT_LOCKED(stream->lock); |
| 1139 | /* Get data offset because we are about to update the index. */ |
| 1140 | data_offset = htobe64(stream->tracefile_size_current); |
| 1141 | |
| 1142 | DBG("handle_index_data: stream %" PRIu64 " net_seq_num %" PRIu64 " data offset %" PRIu64, |
| 1143 | stream->stream_handle, net_seq_num, stream->tracefile_size_current); |
| 1144 | |
| 1145 | /* |
| 1146 | * Lookup for an existing index for that stream id/sequence |
| 1147 | * number. If it exists, the control thread has already received the |
| 1148 | * data for it, thus we need to write it to disk. |
| 1149 | */ |
| 1150 | index = relay_index_get_by_id_or_create(stream, net_seq_num); |
| 1151 | if (!index) { |
| 1152 | ret = -1; |
| 1153 | goto end; |
| 1154 | } |
| 1155 | |
| 1156 | if (rotate_index || !stream->index_file) { |
| 1157 | ret = create_index_file(stream, stream->trace_chunk); |
| 1158 | if (ret) { |
| 1159 | ERR("Failed to create index file for stream %" PRIu64, |
| 1160 | stream->stream_handle); |
| 1161 | /* Put self-ref for this index due to error. */ |
| 1162 | relay_index_put(index); |
| 1163 | index = NULL; |
| 1164 | goto end; |
| 1165 | } |
| 1166 | } |
| 1167 | |
| 1168 | if (relay_index_set_file(index, stream->index_file, data_offset)) { |
| 1169 | ret = -1; |
| 1170 | /* Put self-ref for this index due to error. */ |
| 1171 | relay_index_put(index); |
| 1172 | index = NULL; |
| 1173 | goto end; |
| 1174 | } |
| 1175 | |
| 1176 | ret = relay_index_try_flush(index); |
| 1177 | if (ret == 0) { |
| 1178 | tracefile_array_file_rotate(stream->tfa, TRACEFILE_ROTATE_READ); |
| 1179 | tracefile_array_commit_seq(stream->tfa, stream->index_received_seqcount); |
| 1180 | stream->index_received_seqcount++; |
| 1181 | LTTNG_OPTIONAL_SET(&stream->received_packet_seq_num, |
| 1182 | be64toh(index->index_data.packet_seq_num)); |
| 1183 | *flushed = true; |
| 1184 | } else if (ret > 0) { |
| 1185 | index->total_size = total_size; |
| 1186 | /* No flush. */ |
| 1187 | ret = 0; |
| 1188 | } else { |
| 1189 | /* |
| 1190 | * ret < 0 |
| 1191 | * |
| 1192 | * relay_index_try_flush is responsible for the self-reference |
| 1193 | * put of the index object on error. |
| 1194 | */ |
| 1195 | ERR("relay_index_try_flush error %d", ret); |
| 1196 | ret = -1; |
| 1197 | } |
| 1198 | end: |
| 1199 | return ret; |
| 1200 | } |
| 1201 | |
| 1202 | int stream_complete_packet(struct relay_stream *stream, size_t packet_total_size, |
| 1203 | uint64_t sequence_number, bool index_flushed) |
| 1204 | { |
| 1205 | int ret = 0; |
| 1206 | |
| 1207 | ASSERT_LOCKED(stream->lock); |
| 1208 | |
| 1209 | stream->tracefile_size_current += packet_total_size; |
| 1210 | if (index_flushed) { |
| 1211 | stream->pos_after_last_complete_data_index = |
| 1212 | stream->tracefile_size_current; |
| 1213 | stream->prev_index_seq = sequence_number; |
| 1214 | ret = try_rotate_stream_index(stream); |
| 1215 | if (ret < 0) { |
| 1216 | goto end; |
| 1217 | } |
| 1218 | } |
| 1219 | |
| 1220 | stream->prev_data_seq = sequence_number; |
| 1221 | ret = try_rotate_stream_data(stream); |
| 1222 | |
| 1223 | end: |
| 1224 | return ret; |
| 1225 | } |
| 1226 | |
| 1227 | int stream_add_index(struct relay_stream *stream, |
| 1228 | const struct lttcomm_relayd_index *index_info) |
| 1229 | { |
| 1230 | int ret = 0; |
| 1231 | struct relay_index *index; |
| 1232 | |
| 1233 | ASSERT_LOCKED(stream->lock); |
| 1234 | |
| 1235 | DBG("stream_add_index for stream %" PRIu64, stream->stream_handle); |
| 1236 | |
| 1237 | /* Live beacon handling */ |
| 1238 | if (index_info->packet_size == 0) { |
| 1239 | DBG("Received live beacon for stream %" PRIu64, |
| 1240 | stream->stream_handle); |
| 1241 | |
| 1242 | /* |
| 1243 | * Only flag a stream inactive when it has already |
| 1244 | * received data and no indexes are in flight. |
| 1245 | */ |
| 1246 | if (stream->index_received_seqcount > 0 |
| 1247 | && stream->indexes_in_flight == 0) { |
| 1248 | stream->beacon_ts_end = index_info->timestamp_end; |
| 1249 | } |
| 1250 | ret = 0; |
| 1251 | goto end; |
| 1252 | } else { |
| 1253 | stream->beacon_ts_end = -1ULL; |
| 1254 | } |
| 1255 | |
| 1256 | if (stream->ctf_stream_id == -1ULL) { |
| 1257 | stream->ctf_stream_id = index_info->stream_id; |
| 1258 | } |
| 1259 | |
| 1260 | index = relay_index_get_by_id_or_create(stream, index_info->net_seq_num); |
| 1261 | if (!index) { |
| 1262 | ret = -1; |
| 1263 | ERR("Failed to get or create index %" PRIu64, |
| 1264 | index_info->net_seq_num); |
| 1265 | goto end; |
| 1266 | } |
| 1267 | if (relay_index_set_control_data(index, index_info, |
| 1268 | stream->trace->session->minor)) { |
| 1269 | ERR("set_index_control_data error"); |
| 1270 | relay_index_put(index); |
| 1271 | ret = -1; |
| 1272 | goto end; |
| 1273 | } |
| 1274 | ret = relay_index_try_flush(index); |
| 1275 | if (ret == 0) { |
| 1276 | tracefile_array_file_rotate(stream->tfa, TRACEFILE_ROTATE_READ); |
| 1277 | tracefile_array_commit_seq(stream->tfa, stream->index_received_seqcount); |
| 1278 | stream->index_received_seqcount++; |
| 1279 | stream->pos_after_last_complete_data_index += index->total_size; |
| 1280 | stream->prev_index_seq = index_info->net_seq_num; |
| 1281 | LTTNG_OPTIONAL_SET(&stream->received_packet_seq_num, |
| 1282 | index_info->packet_seq_num); |
| 1283 | |
| 1284 | ret = try_rotate_stream_index(stream); |
| 1285 | if (ret < 0) { |
| 1286 | goto end; |
| 1287 | } |
| 1288 | ret = try_rotate_stream_data(stream); |
| 1289 | if (ret < 0) { |
| 1290 | goto end; |
| 1291 | } |
| 1292 | } else if (ret > 0) { |
| 1293 | /* no flush. */ |
| 1294 | ret = 0; |
| 1295 | } else { |
| 1296 | /* |
| 1297 | * ret < 0 |
| 1298 | * |
| 1299 | * relay_index_try_flush is responsible for the self-reference |
| 1300 | * put of the index object on error. |
| 1301 | */ |
| 1302 | ERR("relay_index_try_flush error %d", ret); |
| 1303 | ret = -1; |
| 1304 | } |
| 1305 | end: |
| 1306 | return ret; |
| 1307 | } |
| 1308 | |
| 1309 | static void print_stream_indexes(struct relay_stream *stream) |
| 1310 | { |
| 1311 | struct lttng_ht_iter iter; |
| 1312 | struct relay_index *index; |
| 1313 | |
| 1314 | rcu_read_lock(); |
| 1315 | cds_lfht_for_each_entry(stream->indexes_ht->ht, &iter.iter, index, |
| 1316 | index_n.node) { |
| 1317 | DBG("index %p net_seq_num %" PRIu64 " refcount %ld" |
| 1318 | " stream %" PRIu64 " trace %" PRIu64 |
| 1319 | " session %" PRIu64, |
| 1320 | index, |
| 1321 | index->index_n.key, |
| 1322 | stream->ref.refcount, |
| 1323 | index->stream->stream_handle, |
| 1324 | index->stream->trace->id, |
| 1325 | index->stream->trace->session->id); |
| 1326 | } |
| 1327 | rcu_read_unlock(); |
| 1328 | } |
| 1329 | |
| 1330 | int stream_reset_file(struct relay_stream *stream) |
| 1331 | { |
| 1332 | ASSERT_LOCKED(stream->lock); |
| 1333 | |
| 1334 | if (stream->file) { |
| 1335 | int ret; |
| 1336 | |
| 1337 | ret = fs_handle_close(stream->file); |
| 1338 | if (ret) { |
| 1339 | ERR("Failed to close stream file handle: channel name = \"%s\", id = %" PRIu64, |
| 1340 | stream->channel_name, |
| 1341 | stream->stream_handle); |
| 1342 | } |
| 1343 | stream->file = NULL; |
| 1344 | } |
| 1345 | |
| 1346 | DBG("%s: reset tracefile_size_current for stream %" PRIu64 " was %" PRIu64, |
| 1347 | __func__, stream->stream_handle, stream->tracefile_size_current); |
| 1348 | stream->tracefile_size_current = 0; |
| 1349 | stream->prev_data_seq = 0; |
| 1350 | stream->prev_index_seq = 0; |
| 1351 | /* Note that this does not reset the tracefile array. */ |
| 1352 | stream->tracefile_current_index = 0; |
| 1353 | stream->pos_after_last_complete_data_index = 0; |
| 1354 | |
| 1355 | return stream_create_data_output_file_from_trace_chunk(stream, |
| 1356 | stream->trace_chunk, true, &stream->file); |
| 1357 | } |
| 1358 | |
| 1359 | void print_relay_streams(void) |
| 1360 | { |
| 1361 | struct lttng_ht_iter iter; |
| 1362 | struct relay_stream *stream; |
| 1363 | |
| 1364 | if (!relay_streams_ht) { |
| 1365 | return; |
| 1366 | } |
| 1367 | |
| 1368 | rcu_read_lock(); |
| 1369 | cds_lfht_for_each_entry(relay_streams_ht->ht, &iter.iter, stream, |
| 1370 | node.node) { |
| 1371 | if (!stream_get(stream)) { |
| 1372 | continue; |
| 1373 | } |
| 1374 | DBG("stream %p refcount %ld stream %" PRIu64 " trace %" PRIu64 |
| 1375 | " session %" PRIu64, |
| 1376 | stream, |
| 1377 | stream->ref.refcount, |
| 1378 | stream->stream_handle, |
| 1379 | stream->trace->id, |
| 1380 | stream->trace->session->id); |
| 1381 | print_stream_indexes(stream); |
| 1382 | stream_put(stream); |
| 1383 | } |
| 1384 | rcu_read_unlock(); |
| 1385 | } |