| 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 | * |
| 6 | * SPDX-License-Identifier: GPL-2.0-only |
| 7 | * |
| 8 | */ |
| 9 | |
| 10 | #define _LGPL_SOURCE |
| 11 | |
| 12 | #include <common/common.h> |
| 13 | #include <common/utils.h> |
| 14 | #include <common/compat/endian.h> |
| 15 | |
| 16 | #include "lttng-relayd.h" |
| 17 | #include "stream.h" |
| 18 | #include "index.h" |
| 19 | #include "connection.h" |
| 20 | |
| 21 | /* |
| 22 | * Allocate a new relay index object. Pass the stream in which it is |
| 23 | * contained as parameter. The sequence number will be used as the hash |
| 24 | * table key. |
| 25 | * |
| 26 | * Called with stream mutex held. |
| 27 | * Return allocated object or else NULL on error. |
| 28 | */ |
| 29 | static struct relay_index *relay_index_create(struct relay_stream *stream, |
| 30 | uint64_t net_seq_num) |
| 31 | { |
| 32 | struct relay_index *index; |
| 33 | |
| 34 | DBG2("Creating relay index for stream id %" PRIu64 " and seqnum %" PRIu64, |
| 35 | stream->stream_handle, net_seq_num); |
| 36 | |
| 37 | index = (relay_index *) zmalloc(sizeof(*index)); |
| 38 | if (!index) { |
| 39 | PERROR("Relay index zmalloc"); |
| 40 | goto end; |
| 41 | } |
| 42 | if (!stream_get(stream)) { |
| 43 | ERR("Cannot get stream"); |
| 44 | free(index); |
| 45 | index = NULL; |
| 46 | goto end; |
| 47 | } |
| 48 | index->stream = stream; |
| 49 | |
| 50 | lttng_ht_node_init_u64(&index->index_n, net_seq_num); |
| 51 | pthread_mutex_init(&index->lock, NULL); |
| 52 | urcu_ref_init(&index->ref); |
| 53 | |
| 54 | end: |
| 55 | return index; |
| 56 | } |
| 57 | |
| 58 | /* |
| 59 | * Add unique relay index to the given hash table. In case of a collision, the |
| 60 | * already existing object is put in the given _index variable. |
| 61 | * |
| 62 | * RCU read side lock MUST be acquired. |
| 63 | */ |
| 64 | static struct relay_index *relay_index_add_unique(struct relay_stream *stream, |
| 65 | struct relay_index *index) |
| 66 | { |
| 67 | struct cds_lfht_node *node_ptr; |
| 68 | struct relay_index *_index; |
| 69 | |
| 70 | DBG2("Adding relay index with stream id %" PRIu64 " and seqnum %" PRIu64, |
| 71 | stream->stream_handle, index->index_n.key); |
| 72 | |
| 73 | node_ptr = cds_lfht_add_unique(stream->indexes_ht->ht, |
| 74 | stream->indexes_ht->hash_fct(&index->index_n, lttng_ht_seed), |
| 75 | stream->indexes_ht->match_fct, &index->index_n, |
| 76 | &index->index_n.node); |
| 77 | if (node_ptr != &index->index_n.node) { |
| 78 | _index = caa_container_of(node_ptr, struct relay_index, |
| 79 | index_n.node); |
| 80 | } else { |
| 81 | _index = NULL; |
| 82 | } |
| 83 | return _index; |
| 84 | } |
| 85 | |
| 86 | /* |
| 87 | * Should be called with RCU read-side lock held. |
| 88 | */ |
| 89 | static bool relay_index_get(struct relay_index *index) |
| 90 | { |
| 91 | DBG2("index get for stream id %" PRIu64 " and seqnum %" PRIu64 " refcount %d", |
| 92 | index->stream->stream_handle, index->index_n.key, |
| 93 | (int) index->ref.refcount); |
| 94 | |
| 95 | return urcu_ref_get_unless_zero(&index->ref); |
| 96 | } |
| 97 | |
| 98 | /* |
| 99 | * Get a relayd index in within the given stream, or create it if not |
| 100 | * present. |
| 101 | * |
| 102 | * Called with stream mutex held. |
| 103 | * Return index object or else NULL on error. |
| 104 | */ |
| 105 | struct relay_index *relay_index_get_by_id_or_create(struct relay_stream *stream, |
| 106 | uint64_t net_seq_num) |
| 107 | { |
| 108 | struct lttng_ht_node_u64 *node; |
| 109 | struct lttng_ht_iter iter; |
| 110 | struct relay_index *index = NULL; |
| 111 | |
| 112 | DBG3("Finding index for stream id %" PRIu64 " and seq_num %" PRIu64, |
| 113 | stream->stream_handle, net_seq_num); |
| 114 | |
| 115 | rcu_read_lock(); |
| 116 | lttng_ht_lookup(stream->indexes_ht, &net_seq_num, &iter); |
| 117 | node = lttng_ht_iter_get_node_u64(&iter); |
| 118 | if (node) { |
| 119 | index = caa_container_of(node, struct relay_index, index_n); |
| 120 | } else { |
| 121 | struct relay_index *oldindex; |
| 122 | |
| 123 | index = relay_index_create(stream, net_seq_num); |
| 124 | if (!index) { |
| 125 | ERR("Cannot create index for stream id %" PRIu64 " and seq_num %" PRIu64, |
| 126 | stream->stream_handle, net_seq_num); |
| 127 | goto end; |
| 128 | } |
| 129 | oldindex = relay_index_add_unique(stream, index); |
| 130 | if (oldindex) { |
| 131 | /* Added concurrently, keep old. */ |
| 132 | relay_index_put(index); |
| 133 | index = oldindex; |
| 134 | if (!relay_index_get(index)) { |
| 135 | index = NULL; |
| 136 | } |
| 137 | } else { |
| 138 | stream->indexes_in_flight++; |
| 139 | index->in_hash_table = true; |
| 140 | } |
| 141 | } |
| 142 | end: |
| 143 | rcu_read_unlock(); |
| 144 | DBG2("Index %sfound or created in HT for stream ID %" PRIu64 " and seqnum %" PRIu64, |
| 145 | (index == NULL) ? "NOT " : "", stream->stream_handle, net_seq_num); |
| 146 | return index; |
| 147 | } |
| 148 | |
| 149 | int relay_index_set_file(struct relay_index *index, |
| 150 | struct lttng_index_file *index_file, |
| 151 | uint64_t data_offset) |
| 152 | { |
| 153 | int ret = 0; |
| 154 | |
| 155 | pthread_mutex_lock(&index->lock); |
| 156 | if (index->index_file) { |
| 157 | ret = -1; |
| 158 | goto end; |
| 159 | } |
| 160 | lttng_index_file_get(index_file); |
| 161 | index->index_file = index_file; |
| 162 | index->index_data.offset = data_offset; |
| 163 | end: |
| 164 | pthread_mutex_unlock(&index->lock); |
| 165 | return ret; |
| 166 | } |
| 167 | |
| 168 | int relay_index_set_data(struct relay_index *index, |
| 169 | const struct ctf_packet_index *data) |
| 170 | { |
| 171 | int ret = 0; |
| 172 | |
| 173 | pthread_mutex_lock(&index->lock); |
| 174 | if (index->has_index_data) { |
| 175 | ret = -1; |
| 176 | goto end; |
| 177 | } |
| 178 | /* Set everything except data_offset. */ |
| 179 | index->index_data.packet_size = data->packet_size; |
| 180 | index->index_data.content_size = data->content_size; |
| 181 | index->index_data.timestamp_begin = data->timestamp_begin; |
| 182 | index->index_data.timestamp_end = data->timestamp_end; |
| 183 | index->index_data.events_discarded = data->events_discarded; |
| 184 | index->index_data.stream_id = data->stream_id; |
| 185 | index->has_index_data = true; |
| 186 | end: |
| 187 | pthread_mutex_unlock(&index->lock); |
| 188 | return ret; |
| 189 | } |
| 190 | |
| 191 | static void index_destroy(struct relay_index *index) |
| 192 | { |
| 193 | free(index); |
| 194 | } |
| 195 | |
| 196 | static void index_destroy_rcu(struct rcu_head *rcu_head) |
| 197 | { |
| 198 | struct relay_index *index = |
| 199 | caa_container_of(rcu_head, struct relay_index, rcu_node); |
| 200 | |
| 201 | index_destroy(index); |
| 202 | } |
| 203 | |
| 204 | /* Stream lock must be held by the caller. */ |
| 205 | static void index_release(struct urcu_ref *ref) |
| 206 | { |
| 207 | struct relay_index *index = caa_container_of(ref, struct relay_index, ref); |
| 208 | struct relay_stream *stream = index->stream; |
| 209 | int ret; |
| 210 | struct lttng_ht_iter iter; |
| 211 | |
| 212 | if (index->index_file) { |
| 213 | lttng_index_file_put(index->index_file); |
| 214 | index->index_file = NULL; |
| 215 | } |
| 216 | if (index->in_hash_table) { |
| 217 | /* Delete index from hash table. */ |
| 218 | iter.iter.node = &index->index_n.node; |
| 219 | ret = lttng_ht_del(stream->indexes_ht, &iter); |
| 220 | LTTNG_ASSERT(!ret); |
| 221 | stream->indexes_in_flight--; |
| 222 | } |
| 223 | |
| 224 | stream_put(index->stream); |
| 225 | index->stream = NULL; |
| 226 | |
| 227 | call_rcu(&index->rcu_node, index_destroy_rcu); |
| 228 | } |
| 229 | |
| 230 | /* |
| 231 | * Called with stream mutex held. |
| 232 | * |
| 233 | * Stream lock must be held by the caller. |
| 234 | */ |
| 235 | void relay_index_put(struct relay_index *index) |
| 236 | { |
| 237 | DBG2("index put for stream id %" PRIu64 " and seqnum %" PRIu64 " refcount %d", |
| 238 | index->stream->stream_handle, index->index_n.key, |
| 239 | (int) index->ref.refcount); |
| 240 | /* |
| 241 | * Ensure existence of index->lock for index unlock. |
| 242 | */ |
| 243 | rcu_read_lock(); |
| 244 | /* |
| 245 | * Index lock ensures that concurrent test and update of stream |
| 246 | * ref is atomic. |
| 247 | */ |
| 248 | LTTNG_ASSERT(index->ref.refcount != 0); |
| 249 | urcu_ref_put(&index->ref, index_release); |
| 250 | rcu_read_unlock(); |
| 251 | } |
| 252 | |
| 253 | /* |
| 254 | * Try to flush index to disk. Releases self-reference to index once |
| 255 | * flush succeeds. |
| 256 | * |
| 257 | * Stream lock must be held by the caller. |
| 258 | * Return 0 on successful flush, a negative value on error, or positive |
| 259 | * value if no flush was performed. |
| 260 | */ |
| 261 | int relay_index_try_flush(struct relay_index *index) |
| 262 | { |
| 263 | int ret = 1; |
| 264 | bool flushed = false; |
| 265 | |
| 266 | pthread_mutex_lock(&index->lock); |
| 267 | if (index->flushed) { |
| 268 | goto skip; |
| 269 | } |
| 270 | /* Check if we are ready to flush. */ |
| 271 | if (!index->has_index_data || !index->index_file) { |
| 272 | goto skip; |
| 273 | } |
| 274 | |
| 275 | DBG2("Writing index for stream ID %" PRIu64 " and seq num %" PRIu64, |
| 276 | index->stream->stream_handle, index->index_n.key); |
| 277 | flushed = true; |
| 278 | index->flushed = true; |
| 279 | ret = lttng_index_file_write(index->index_file, &index->index_data); |
| 280 | skip: |
| 281 | pthread_mutex_unlock(&index->lock); |
| 282 | |
| 283 | if (flushed) { |
| 284 | /* Put self-ref from index now that it has been flushed. */ |
| 285 | relay_index_put(index); |
| 286 | } |
| 287 | return ret; |
| 288 | } |
| 289 | |
| 290 | /* |
| 291 | * Close every relay index within a given stream, without flushing |
| 292 | * them. |
| 293 | */ |
| 294 | void relay_index_close_all(struct relay_stream *stream) |
| 295 | { |
| 296 | struct lttng_ht_iter iter; |
| 297 | struct relay_index *index; |
| 298 | |
| 299 | rcu_read_lock(); |
| 300 | cds_lfht_for_each_entry(stream->indexes_ht->ht, &iter.iter, |
| 301 | index, index_n.node) { |
| 302 | /* Put self-ref from index. */ |
| 303 | relay_index_put(index); |
| 304 | } |
| 305 | rcu_read_unlock(); |
| 306 | } |
| 307 | |
| 308 | void relay_index_close_partial_fd(struct relay_stream *stream) |
| 309 | { |
| 310 | struct lttng_ht_iter iter; |
| 311 | struct relay_index *index; |
| 312 | |
| 313 | rcu_read_lock(); |
| 314 | cds_lfht_for_each_entry(stream->indexes_ht->ht, &iter.iter, |
| 315 | index, index_n.node) { |
| 316 | if (!index->index_file) { |
| 317 | continue; |
| 318 | } |
| 319 | /* |
| 320 | * Partial index has its index_file: we have only |
| 321 | * received its info from the data socket. |
| 322 | * Put self-ref from index. |
| 323 | */ |
| 324 | relay_index_put(index); |
| 325 | } |
| 326 | rcu_read_unlock(); |
| 327 | } |
| 328 | |
| 329 | uint64_t relay_index_find_last(struct relay_stream *stream) |
| 330 | { |
| 331 | struct lttng_ht_iter iter; |
| 332 | struct relay_index *index; |
| 333 | uint64_t net_seq_num = -1ULL; |
| 334 | |
| 335 | rcu_read_lock(); |
| 336 | cds_lfht_for_each_entry(stream->indexes_ht->ht, &iter.iter, |
| 337 | index, index_n.node) { |
| 338 | if (net_seq_num == -1ULL || |
| 339 | index->index_n.key > net_seq_num) { |
| 340 | net_seq_num = index->index_n.key; |
| 341 | } |
| 342 | } |
| 343 | rcu_read_unlock(); |
| 344 | return net_seq_num; |
| 345 | } |
| 346 | |
| 347 | /* |
| 348 | * Update the index file of an already existing relay_index. |
| 349 | * Offsets by 'removed_data_count' the offset field of an index. |
| 350 | */ |
| 351 | static |
| 352 | int relay_index_switch_file(struct relay_index *index, |
| 353 | struct lttng_index_file *new_index_file, |
| 354 | uint64_t removed_data_count) |
| 355 | { |
| 356 | int ret = 0; |
| 357 | uint64_t offset; |
| 358 | |
| 359 | pthread_mutex_lock(&index->lock); |
| 360 | if (!index->index_file) { |
| 361 | ERR("No index_file"); |
| 362 | ret = 0; |
| 363 | goto end; |
| 364 | } |
| 365 | |
| 366 | lttng_index_file_put(index->index_file); |
| 367 | lttng_index_file_get(new_index_file); |
| 368 | index->index_file = new_index_file; |
| 369 | offset = be64toh(index->index_data.offset); |
| 370 | index->index_data.offset = htobe64(offset - removed_data_count); |
| 371 | |
| 372 | end: |
| 373 | pthread_mutex_unlock(&index->lock); |
| 374 | return ret; |
| 375 | } |
| 376 | |
| 377 | /* |
| 378 | * Switch the index file of all pending indexes for a stream and update the |
| 379 | * data offset by substracting the last safe position. |
| 380 | * Stream lock must be held. |
| 381 | */ |
| 382 | int relay_index_switch_all_files(struct relay_stream *stream) |
| 383 | { |
| 384 | struct lttng_ht_iter iter; |
| 385 | struct relay_index *index; |
| 386 | int ret = 0; |
| 387 | |
| 388 | rcu_read_lock(); |
| 389 | cds_lfht_for_each_entry(stream->indexes_ht->ht, &iter.iter, |
| 390 | index, index_n.node) { |
| 391 | ret = relay_index_switch_file(index, stream->index_file, |
| 392 | stream->pos_after_last_complete_data_index); |
| 393 | if (ret) { |
| 394 | goto end; |
| 395 | } |
| 396 | } |
| 397 | end: |
| 398 | rcu_read_unlock(); |
| 399 | return ret; |
| 400 | } |
| 401 | |
| 402 | /* |
| 403 | * Set index data from the control port to a given index object. |
| 404 | */ |
| 405 | int relay_index_set_control_data(struct relay_index *index, |
| 406 | const struct lttcomm_relayd_index *data, |
| 407 | unsigned int minor_version) |
| 408 | { |
| 409 | /* The index on disk is encoded in big endian. */ |
| 410 | ctf_packet_index index_data {}; |
| 411 | |
| 412 | index_data.packet_size = htobe64(data->packet_size); |
| 413 | index_data.content_size = htobe64(data->content_size); |
| 414 | index_data.timestamp_begin = htobe64(data->timestamp_begin); |
| 415 | index_data.timestamp_end = htobe64(data->timestamp_end); |
| 416 | index_data.events_discarded = htobe64(data->events_discarded); |
| 417 | index_data.stream_id = htobe64(data->stream_id); |
| 418 | |
| 419 | if (minor_version >= 8) { |
| 420 | index->index_data.stream_instance_id = htobe64(data->stream_instance_id); |
| 421 | index->index_data.packet_seq_num = htobe64(data->packet_seq_num); |
| 422 | } else { |
| 423 | uint64_t unset_value = -1ULL; |
| 424 | |
| 425 | index->index_data.stream_instance_id = htobe64(unset_value); |
| 426 | index->index_data.packet_seq_num = htobe64(unset_value); |
| 427 | } |
| 428 | |
| 429 | return relay_index_set_data(index, &index_data); |
| 430 | } |