| 1 | /* |
| 2 | * Copyright (C) 2013 David Goulet <dgoulet@efficios.com> |
| 3 | * |
| 4 | * SPDX-License-Identifier: GPL-2.0-only |
| 5 | * |
| 6 | */ |
| 7 | |
| 8 | #define _LGPL_SOURCE |
| 9 | #include <inttypes.h> |
| 10 | |
| 11 | #include <common/common.h> |
| 12 | #include <common/hashtable/utils.h> |
| 13 | |
| 14 | #include "buffer-registry.h" |
| 15 | #include "fd-limit.h" |
| 16 | #include "ust-consumer.h" |
| 17 | #include "lttng-ust-ctl.h" |
| 18 | #include "lttng-ust-error.h" |
| 19 | #include "utils.h" |
| 20 | |
| 21 | /* |
| 22 | * Set in main.c during initialization process of the daemon. This contains |
| 23 | * buffer_reg_uid object which are global registry for per UID buffer. Object |
| 24 | * are indexed by session id and matched by the triplet |
| 25 | * <session_id/bits_per_long/uid>. |
| 26 | */ |
| 27 | static struct lttng_ht *buffer_registry_uid; |
| 28 | |
| 29 | /* |
| 30 | * Initialized at the daemon start. This contains buffer_reg_pid object and |
| 31 | * indexed by session id. |
| 32 | */ |
| 33 | static struct lttng_ht *buffer_registry_pid; |
| 34 | |
| 35 | /* |
| 36 | * Match function for the per UID registry hash table. It matches a registry |
| 37 | * uid object with the triplet <session_id/abi/uid>. |
| 38 | */ |
| 39 | static int ht_match_reg_uid(struct cds_lfht_node *node, const void *_key) |
| 40 | { |
| 41 | struct buffer_reg_uid *reg; |
| 42 | const struct buffer_reg_uid *key; |
| 43 | |
| 44 | assert(node); |
| 45 | assert(_key); |
| 46 | |
| 47 | reg = caa_container_of(node, struct buffer_reg_uid, node.node); |
| 48 | assert(reg); |
| 49 | key = _key; |
| 50 | |
| 51 | if (key->session_id != reg->session_id || |
| 52 | key->bits_per_long != reg->bits_per_long || |
| 53 | key->uid != reg->uid) { |
| 54 | goto no_match; |
| 55 | } |
| 56 | |
| 57 | /* Match */ |
| 58 | return 1; |
| 59 | no_match: |
| 60 | return 0; |
| 61 | } |
| 62 | |
| 63 | /* |
| 64 | * Hash function for the per UID registry hash table. This XOR the triplet |
| 65 | * together. |
| 66 | */ |
| 67 | static unsigned long ht_hash_reg_uid(const void *_key, unsigned long seed) |
| 68 | { |
| 69 | uint64_t xored_key; |
| 70 | const struct buffer_reg_uid *key = _key; |
| 71 | |
| 72 | assert(key); |
| 73 | |
| 74 | xored_key = (uint64_t)(key->session_id ^ key->bits_per_long ^ key->uid); |
| 75 | return hash_key_u64(&xored_key, seed); |
| 76 | } |
| 77 | |
| 78 | /* |
| 79 | * Initialize global buffer per UID registry. Should only be called ONCE!. |
| 80 | */ |
| 81 | void buffer_reg_init_uid_registry(void) |
| 82 | { |
| 83 | /* Should be called once. */ |
| 84 | assert(!buffer_registry_uid); |
| 85 | buffer_registry_uid = lttng_ht_new(0, LTTNG_HT_TYPE_U64); |
| 86 | assert(buffer_registry_uid); |
| 87 | buffer_registry_uid->match_fct = ht_match_reg_uid; |
| 88 | buffer_registry_uid->hash_fct = ht_hash_reg_uid; |
| 89 | |
| 90 | DBG3("Global buffer per UID registry initialized"); |
| 91 | } |
| 92 | |
| 93 | /* |
| 94 | * Allocate and initialize object. Set regp with the object pointer. |
| 95 | * |
| 96 | * Return 0 on success else a negative value and regp is untouched. |
| 97 | */ |
| 98 | int buffer_reg_uid_create(uint64_t session_id, uint32_t bits_per_long, uid_t uid, |
| 99 | enum lttng_domain_type domain, struct buffer_reg_uid **regp, |
| 100 | const char *root_shm_path, const char *shm_path) |
| 101 | { |
| 102 | int ret = 0; |
| 103 | struct buffer_reg_uid *reg = NULL; |
| 104 | |
| 105 | assert(regp); |
| 106 | |
| 107 | reg = zmalloc(sizeof(*reg)); |
| 108 | if (!reg) { |
| 109 | PERROR("zmalloc buffer registry uid"); |
| 110 | ret = -ENOMEM; |
| 111 | goto error; |
| 112 | } |
| 113 | |
| 114 | reg->registry = zmalloc(sizeof(struct buffer_reg_session)); |
| 115 | if (!reg->registry) { |
| 116 | PERROR("zmalloc buffer registry uid session"); |
| 117 | ret = -ENOMEM; |
| 118 | goto error; |
| 119 | } |
| 120 | |
| 121 | reg->session_id = session_id; |
| 122 | reg->bits_per_long = bits_per_long; |
| 123 | reg->uid = uid; |
| 124 | reg->domain = domain; |
| 125 | if (shm_path[0]) { |
| 126 | strncpy(reg->root_shm_path, root_shm_path, sizeof(reg->root_shm_path)); |
| 127 | reg->root_shm_path[sizeof(reg->root_shm_path) - 1] = '\0'; |
| 128 | strncpy(reg->shm_path, shm_path, sizeof(reg->shm_path)); |
| 129 | reg->shm_path[sizeof(reg->shm_path) - 1] = '\0'; |
| 130 | DBG3("shm path '%s' is assigned to uid buffer registry for session id %" PRIu64, |
| 131 | reg->shm_path, session_id); |
| 132 | } |
| 133 | reg->registry->channels = lttng_ht_new(0, LTTNG_HT_TYPE_U64); |
| 134 | if (!reg->registry->channels) { |
| 135 | ret = -ENOMEM; |
| 136 | goto error_session; |
| 137 | } |
| 138 | |
| 139 | reg->registry->maps = lttng_ht_new(0, LTTNG_HT_TYPE_U64); |
| 140 | if (!reg->registry->maps) { |
| 141 | lttng_ht_destroy(reg->registry->channels); |
| 142 | ret = -ENOMEM; |
| 143 | goto error_session; |
| 144 | } |
| 145 | |
| 146 | |
| 147 | cds_lfht_node_init(®->node.node); |
| 148 | *regp = reg; |
| 149 | |
| 150 | DBG3("Buffer registry per UID created id: %" PRIu64 ", ABI: %u, uid: %d, domain: %d", |
| 151 | session_id, bits_per_long, uid, domain); |
| 152 | |
| 153 | return 0; |
| 154 | |
| 155 | error_session: |
| 156 | free(reg->registry); |
| 157 | error: |
| 158 | free(reg); |
| 159 | return ret; |
| 160 | } |
| 161 | |
| 162 | /* |
| 163 | * Add a buffer registry per UID object to the global registry. |
| 164 | */ |
| 165 | void buffer_reg_uid_add(struct buffer_reg_uid *reg) |
| 166 | { |
| 167 | struct cds_lfht_node *nodep; |
| 168 | struct lttng_ht *ht = buffer_registry_uid; |
| 169 | |
| 170 | assert(reg); |
| 171 | |
| 172 | DBG3("Buffer registry per UID adding to global registry with id: %" PRIu64 , |
| 173 | reg->session_id); |
| 174 | |
| 175 | rcu_read_lock(); |
| 176 | nodep = cds_lfht_add_unique(ht->ht, ht->hash_fct(reg, lttng_ht_seed), |
| 177 | ht->match_fct, reg, ®->node.node); |
| 178 | assert(nodep == ®->node.node); |
| 179 | rcu_read_unlock(); |
| 180 | } |
| 181 | |
| 182 | /* |
| 183 | * Find a buffer registry per UID object with given params. RCU read side lock |
| 184 | * MUST be acquired before calling this and hold on to protect the object. |
| 185 | * |
| 186 | * Return the object pointer or NULL on error. |
| 187 | */ |
| 188 | struct buffer_reg_uid *buffer_reg_uid_find(uint64_t session_id, |
| 189 | uint32_t bits_per_long, uid_t uid) |
| 190 | { |
| 191 | struct lttng_ht_node_u64 *node; |
| 192 | struct lttng_ht_iter iter; |
| 193 | struct buffer_reg_uid *reg = NULL, key; |
| 194 | struct lttng_ht *ht = buffer_registry_uid; |
| 195 | |
| 196 | /* Setup key we are looking for. */ |
| 197 | key.session_id = session_id; |
| 198 | key.bits_per_long = bits_per_long; |
| 199 | key.uid = uid; |
| 200 | |
| 201 | DBG3("Buffer registry per UID find id: %" PRIu64 ", ABI: %u, uid: %d", |
| 202 | session_id, bits_per_long, uid); |
| 203 | |
| 204 | /* Custom lookup function since it's a different key. */ |
| 205 | cds_lfht_lookup(ht->ht, ht->hash_fct(&key, lttng_ht_seed), ht->match_fct, |
| 206 | &key, &iter.iter); |
| 207 | node = lttng_ht_iter_get_node_u64(&iter); |
| 208 | if (!node) { |
| 209 | goto end; |
| 210 | } |
| 211 | reg = caa_container_of(node, struct buffer_reg_uid, node); |
| 212 | |
| 213 | end: |
| 214 | return reg; |
| 215 | } |
| 216 | |
| 217 | /* |
| 218 | * Initialize global buffer per PID registry. Should only be called ONCE!. |
| 219 | */ |
| 220 | void buffer_reg_init_pid_registry(void) |
| 221 | { |
| 222 | /* Should be called once. */ |
| 223 | assert(!buffer_registry_pid); |
| 224 | buffer_registry_pid = lttng_ht_new(0, LTTNG_HT_TYPE_U64); |
| 225 | assert(buffer_registry_pid); |
| 226 | |
| 227 | DBG3("Global buffer per PID registry initialized"); |
| 228 | } |
| 229 | |
| 230 | /* |
| 231 | * Allocate and initialize object. Set regp with the object pointer. |
| 232 | * |
| 233 | * Return 0 on success else a negative value and regp is untouched. |
| 234 | */ |
| 235 | int buffer_reg_pid_create(uint64_t session_id, struct buffer_reg_pid **regp, |
| 236 | const char *root_shm_path, const char *shm_path) |
| 237 | { |
| 238 | int ret = 0; |
| 239 | struct buffer_reg_pid *reg = NULL; |
| 240 | |
| 241 | assert(regp); |
| 242 | |
| 243 | reg = zmalloc(sizeof(*reg)); |
| 244 | if (!reg) { |
| 245 | PERROR("zmalloc buffer registry pid"); |
| 246 | ret = -ENOMEM; |
| 247 | goto error; |
| 248 | } |
| 249 | |
| 250 | reg->registry = zmalloc(sizeof(struct buffer_reg_session)); |
| 251 | if (!reg->registry) { |
| 252 | PERROR("zmalloc buffer registry pid session"); |
| 253 | ret = -ENOMEM; |
| 254 | goto error; |
| 255 | } |
| 256 | |
| 257 | /* A cast is done here so we can use the session ID as a u64 ht node. */ |
| 258 | reg->session_id = session_id; |
| 259 | if (shm_path[0]) { |
| 260 | strncpy(reg->root_shm_path, root_shm_path, sizeof(reg->root_shm_path)); |
| 261 | reg->root_shm_path[sizeof(reg->root_shm_path) - 1] = '\0'; |
| 262 | strncpy(reg->shm_path, shm_path, sizeof(reg->shm_path)); |
| 263 | reg->shm_path[sizeof(reg->shm_path) - 1] = '\0'; |
| 264 | DBG3("shm path '%s' is assigned to pid buffer registry for session id %" PRIu64, |
| 265 | reg->shm_path, session_id); |
| 266 | } |
| 267 | reg->registry->channels = lttng_ht_new(0, LTTNG_HT_TYPE_U64); |
| 268 | if (!reg->registry->channels) { |
| 269 | ret = -ENOMEM; |
| 270 | goto error_session; |
| 271 | } |
| 272 | |
| 273 | reg->registry->maps = lttng_ht_new(0, LTTNG_HT_TYPE_U64); |
| 274 | if (!reg->registry->maps) { |
| 275 | lttng_ht_destroy(reg->registry->channels); |
| 276 | ret = -ENOMEM; |
| 277 | goto error_session; |
| 278 | } |
| 279 | |
| 280 | lttng_ht_node_init_u64(®->node, reg->session_id); |
| 281 | *regp = reg; |
| 282 | |
| 283 | DBG3("Buffer registry per PID created with session id: %" PRIu64, |
| 284 | session_id); |
| 285 | |
| 286 | return 0; |
| 287 | |
| 288 | error_session: |
| 289 | free(reg->registry); |
| 290 | error: |
| 291 | free(reg); |
| 292 | return ret; |
| 293 | } |
| 294 | |
| 295 | /* |
| 296 | * Add a buffer registry per PID object to the global registry. |
| 297 | */ |
| 298 | void buffer_reg_pid_add(struct buffer_reg_pid *reg) |
| 299 | { |
| 300 | assert(reg); |
| 301 | |
| 302 | DBG3("Buffer registry per PID adding to global registry with id: %" PRIu64, |
| 303 | reg->session_id); |
| 304 | |
| 305 | rcu_read_lock(); |
| 306 | lttng_ht_add_unique_u64(buffer_registry_pid, ®->node); |
| 307 | rcu_read_unlock(); |
| 308 | } |
| 309 | |
| 310 | /* |
| 311 | * Find a buffer registry per PID object with given params. RCU read side lock |
| 312 | * MUST be acquired before calling this and hold on to protect the object. |
| 313 | * |
| 314 | * Return the object pointer or NULL on error. |
| 315 | */ |
| 316 | struct buffer_reg_pid *buffer_reg_pid_find(uint64_t session_id) |
| 317 | { |
| 318 | struct lttng_ht_node_u64 *node; |
| 319 | struct lttng_ht_iter iter; |
| 320 | struct buffer_reg_pid *reg = NULL; |
| 321 | struct lttng_ht *ht = buffer_registry_pid; |
| 322 | |
| 323 | DBG3("Buffer registry per PID find id: %" PRIu64, session_id); |
| 324 | |
| 325 | lttng_ht_lookup(ht, &session_id, &iter); |
| 326 | node = lttng_ht_iter_get_node_u64(&iter); |
| 327 | if (!node) { |
| 328 | goto end; |
| 329 | } |
| 330 | reg = caa_container_of(node, struct buffer_reg_pid, node); |
| 331 | |
| 332 | end: |
| 333 | return reg; |
| 334 | } |
| 335 | |
| 336 | /* |
| 337 | * Find the consumer channel key from a UST session per-uid channel key. |
| 338 | * |
| 339 | * Return the matching key or -1 if not found. |
| 340 | */ |
| 341 | int buffer_reg_uid_consumer_channel_key( |
| 342 | struct cds_list_head *buffer_reg_uid_list, |
| 343 | uint64_t chan_key, uint64_t *consumer_chan_key) |
| 344 | { |
| 345 | struct lttng_ht_iter iter; |
| 346 | struct buffer_reg_uid *uid_reg = NULL; |
| 347 | struct buffer_reg_session *session_reg = NULL; |
| 348 | struct buffer_reg_channel *reg_chan; |
| 349 | int ret = -1; |
| 350 | |
| 351 | rcu_read_lock(); |
| 352 | /* |
| 353 | * For the per-uid registry, we have to iterate since we don't have the |
| 354 | * uid and bitness key. |
| 355 | */ |
| 356 | cds_list_for_each_entry(uid_reg, buffer_reg_uid_list, lnode) { |
| 357 | session_reg = uid_reg->registry; |
| 358 | cds_lfht_for_each_entry(session_reg->channels->ht, |
| 359 | &iter.iter, reg_chan, node.node) { |
| 360 | if (reg_chan->key == chan_key) { |
| 361 | *consumer_chan_key = reg_chan->consumer_key; |
| 362 | ret = 0; |
| 363 | goto end; |
| 364 | } |
| 365 | } |
| 366 | } |
| 367 | |
| 368 | end: |
| 369 | rcu_read_unlock(); |
| 370 | return ret; |
| 371 | } |
| 372 | |
| 373 | /* |
| 374 | * Allocate and initialize a buffer registry channel with the given key. Set |
| 375 | * regp with the object pointer. |
| 376 | * |
| 377 | * Return 0 on success or else a negative value keeping regp untouched. |
| 378 | */ |
| 379 | int buffer_reg_channel_create(uint64_t key, struct buffer_reg_channel **regp) |
| 380 | { |
| 381 | struct buffer_reg_channel *reg; |
| 382 | |
| 383 | assert(regp); |
| 384 | |
| 385 | DBG3("Buffer registry channel create with key: %" PRIu64, key); |
| 386 | |
| 387 | reg = zmalloc(sizeof(*reg)); |
| 388 | if (!reg) { |
| 389 | PERROR("zmalloc buffer registry channel"); |
| 390 | return -ENOMEM; |
| 391 | } |
| 392 | |
| 393 | reg->key = key; |
| 394 | CDS_INIT_LIST_HEAD(®->streams); |
| 395 | pthread_mutex_init(®->stream_list_lock, NULL); |
| 396 | |
| 397 | lttng_ht_node_init_u64(®->node, key); |
| 398 | *regp = reg; |
| 399 | |
| 400 | return 0; |
| 401 | } |
| 402 | |
| 403 | /* |
| 404 | * Allocate and initialize a buffer registry map with the given key. Set |
| 405 | * regp with the object pointer. |
| 406 | * |
| 407 | * Return 0 on success or else a negative value keeping regp untouched. |
| 408 | */ |
| 409 | int buffer_reg_map_create(uint64_t key, struct buffer_reg_map **regp) |
| 410 | { |
| 411 | struct buffer_reg_map *reg; |
| 412 | |
| 413 | assert(regp); |
| 414 | |
| 415 | DBG3("Buffer registry map create with key: %" PRIu64, key); |
| 416 | |
| 417 | reg = zmalloc(sizeof(*reg)); |
| 418 | if (!reg) { |
| 419 | PERROR("zmalloc buffer registry map"); |
| 420 | return -ENOMEM; |
| 421 | } |
| 422 | |
| 423 | reg->key = key; |
| 424 | CDS_INIT_LIST_HEAD(®->counters); |
| 425 | pthread_mutex_init(®->counter_list_lock, NULL); |
| 426 | |
| 427 | lttng_ht_node_init_u64(®->node, key); |
| 428 | *regp = reg; |
| 429 | |
| 430 | return 0; |
| 431 | } |
| 432 | |
| 433 | /* |
| 434 | * Allocate and initialize a buffer registry stream. Set regp with the object |
| 435 | * pointer. |
| 436 | * |
| 437 | * Return 0 on success or else a negative value keeping regp untouched. |
| 438 | */ |
| 439 | int buffer_reg_stream_create(struct buffer_reg_stream **regp) |
| 440 | { |
| 441 | struct buffer_reg_stream *reg; |
| 442 | |
| 443 | assert(regp); |
| 444 | |
| 445 | DBG3("Buffer registry creating stream"); |
| 446 | |
| 447 | reg = zmalloc(sizeof(*reg)); |
| 448 | if (!reg) { |
| 449 | PERROR("zmalloc buffer registry stream"); |
| 450 | return -ENOMEM; |
| 451 | } |
| 452 | |
| 453 | *regp = reg; |
| 454 | |
| 455 | return 0; |
| 456 | } |
| 457 | |
| 458 | /* |
| 459 | * Allocate and initialize a buffer registry map_counter. Set regp with the object |
| 460 | * pointer. |
| 461 | * |
| 462 | * Return 0 on success or else a negative value keeping regp untouched. |
| 463 | */ |
| 464 | int buffer_reg_map_counter_create(struct buffer_reg_map_counter **regp) |
| 465 | { |
| 466 | struct buffer_reg_map_counter *reg; |
| 467 | |
| 468 | assert(regp); |
| 469 | |
| 470 | DBG3("Buffer registry creating map_counter"); |
| 471 | |
| 472 | reg = zmalloc(sizeof(*reg)); |
| 473 | if (!reg) { |
| 474 | PERROR("zmalloc buffer registry map_counter"); |
| 475 | return -ENOMEM; |
| 476 | } |
| 477 | |
| 478 | *regp = reg; |
| 479 | |
| 480 | return 0; |
| 481 | } |
| 482 | |
| 483 | /* |
| 484 | * Add stream to the list in the channel. |
| 485 | */ |
| 486 | void buffer_reg_stream_add(struct buffer_reg_stream *stream, |
| 487 | struct buffer_reg_channel *channel) |
| 488 | { |
| 489 | assert(stream); |
| 490 | assert(channel); |
| 491 | |
| 492 | pthread_mutex_lock(&channel->stream_list_lock); |
| 493 | cds_list_add_tail(&stream->lnode, &channel->streams); |
| 494 | channel->stream_count++; |
| 495 | pthread_mutex_unlock(&channel->stream_list_lock); |
| 496 | } |
| 497 | |
| 498 | /* |
| 499 | * Add map_counter to the list in the map. |
| 500 | */ |
| 501 | void buffer_reg_map_counter_add(struct buffer_reg_map_counter *map_counter, |
| 502 | struct buffer_reg_map *map) |
| 503 | { |
| 504 | assert(map_counter); |
| 505 | assert(map); |
| 506 | |
| 507 | pthread_mutex_lock(&map->counter_list_lock); |
| 508 | cds_list_add_tail(&map_counter->lnode, &map->counters); |
| 509 | map->counter_count++; |
| 510 | pthread_mutex_unlock(&map->counter_list_lock); |
| 511 | } |
| 512 | |
| 513 | /* |
| 514 | * Add a buffer registry channel object to the given session. |
| 515 | */ |
| 516 | void buffer_reg_channel_add(struct buffer_reg_session *session, |
| 517 | struct buffer_reg_channel *channel) |
| 518 | { |
| 519 | assert(session); |
| 520 | assert(channel); |
| 521 | |
| 522 | rcu_read_lock(); |
| 523 | lttng_ht_add_unique_u64(session->channels, &channel->node); |
| 524 | rcu_read_unlock(); |
| 525 | } |
| 526 | |
| 527 | /* |
| 528 | * Add a buffer registry map object to the given session. |
| 529 | */ |
| 530 | void buffer_reg_map_add(struct buffer_reg_session *session, |
| 531 | struct buffer_reg_map *map) |
| 532 | { |
| 533 | assert(session); |
| 534 | assert(map); |
| 535 | |
| 536 | rcu_read_lock(); |
| 537 | lttng_ht_add_unique_u64(session->maps, &map->node); |
| 538 | rcu_read_unlock(); |
| 539 | } |
| 540 | |
| 541 | /* |
| 542 | * Find a buffer registry channel object with the given key. RCU read side lock |
| 543 | * MUST be acquired and hold on until the object reference is not needed |
| 544 | * anymore. |
| 545 | * |
| 546 | * Return the object pointer or NULL on error. |
| 547 | */ |
| 548 | struct buffer_reg_channel *buffer_reg_channel_find(uint64_t key, |
| 549 | struct buffer_reg_uid *reg) |
| 550 | { |
| 551 | struct lttng_ht_node_u64 *node; |
| 552 | struct lttng_ht_iter iter; |
| 553 | struct buffer_reg_channel *chan = NULL; |
| 554 | struct lttng_ht *ht; |
| 555 | |
| 556 | assert(reg); |
| 557 | |
| 558 | switch (reg->domain) { |
| 559 | case LTTNG_DOMAIN_UST: |
| 560 | ht = reg->registry->channels; |
| 561 | break; |
| 562 | default: |
| 563 | assert(0); |
| 564 | goto end; |
| 565 | } |
| 566 | |
| 567 | lttng_ht_lookup(ht, &key, &iter); |
| 568 | node = lttng_ht_iter_get_node_u64(&iter); |
| 569 | if (!node) { |
| 570 | goto end; |
| 571 | } |
| 572 | chan = caa_container_of(node, struct buffer_reg_channel, node); |
| 573 | |
| 574 | end: |
| 575 | return chan; |
| 576 | } |
| 577 | |
| 578 | /* |
| 579 | * Find a buffer registry map object with the given key. RCU read side lock |
| 580 | * MUST be acquired and hold on until the object reference is not needed |
| 581 | * anymore. |
| 582 | * |
| 583 | * Return the object pointer or NULL on error. |
| 584 | */ |
| 585 | struct buffer_reg_map *buffer_reg_map_find(uint64_t key, |
| 586 | struct buffer_reg_uid *reg) |
| 587 | { |
| 588 | struct lttng_ht_node_u64 *node; |
| 589 | struct lttng_ht_iter iter; |
| 590 | struct buffer_reg_map *map = NULL; |
| 591 | struct lttng_ht *ht; |
| 592 | |
| 593 | assert(reg); |
| 594 | |
| 595 | switch (reg->domain) { |
| 596 | case LTTNG_DOMAIN_UST: |
| 597 | ht = reg->registry->maps; |
| 598 | break; |
| 599 | default: |
| 600 | assert(0); |
| 601 | goto end; |
| 602 | } |
| 603 | |
| 604 | lttng_ht_lookup(ht, &key, &iter); |
| 605 | node = lttng_ht_iter_get_node_u64(&iter); |
| 606 | if (!node) { |
| 607 | goto end; |
| 608 | } |
| 609 | map = caa_container_of(node, struct buffer_reg_map, node); |
| 610 | |
| 611 | end: |
| 612 | return map; |
| 613 | } |
| 614 | |
| 615 | /* |
| 616 | * Destroy a buffer registry stream with the given domain. |
| 617 | */ |
| 618 | void buffer_reg_stream_destroy(struct buffer_reg_stream *regp, |
| 619 | enum lttng_domain_type domain) |
| 620 | { |
| 621 | if (!regp) { |
| 622 | return; |
| 623 | } |
| 624 | |
| 625 | DBG3("Buffer registry stream destroy with handle %d", |
| 626 | regp->obj.ust->handle); |
| 627 | |
| 628 | switch (domain) { |
| 629 | case LTTNG_DOMAIN_UST: |
| 630 | { |
| 631 | int ret; |
| 632 | |
| 633 | ret = ust_app_release_object(NULL, regp->obj.ust); |
| 634 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
| 635 | ERR("Buffer reg stream release obj handle %d failed with ret %d", |
| 636 | regp->obj.ust->handle, ret); |
| 637 | } |
| 638 | free(regp->obj.ust); |
| 639 | lttng_fd_put(LTTNG_FD_APPS, 2); |
| 640 | break; |
| 641 | } |
| 642 | default: |
| 643 | assert(0); |
| 644 | } |
| 645 | |
| 646 | free(regp); |
| 647 | return; |
| 648 | } |
| 649 | |
| 650 | /* |
| 651 | * Destroy a buffer registry map_counter with the given domain. |
| 652 | */ |
| 653 | void buffer_reg_map_counter_destroy(struct buffer_reg_map_counter *regp, |
| 654 | enum lttng_domain_type domain) |
| 655 | { |
| 656 | if (!regp) { |
| 657 | return; |
| 658 | } |
| 659 | |
| 660 | DBG3("Buffer registry map counter destroy with handle %d", |
| 661 | regp->obj.ust->handle); |
| 662 | |
| 663 | switch (domain) { |
| 664 | case LTTNG_DOMAIN_UST: |
| 665 | { |
| 666 | int ret; |
| 667 | |
| 668 | ret = ust_app_release_object(NULL, regp->obj.ust); |
| 669 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
| 670 | ERR("Buffer reg map counter release obj handle %d failed with ret %d", |
| 671 | regp->obj.ust->handle, ret); |
| 672 | } |
| 673 | free(regp->obj.ust); |
| 674 | lttng_fd_put(LTTNG_FD_APPS, 2); |
| 675 | break; |
| 676 | } |
| 677 | default: |
| 678 | assert(0); |
| 679 | } |
| 680 | |
| 681 | free(regp); |
| 682 | return; |
| 683 | } |
| 684 | |
| 685 | /* |
| 686 | * Remove buffer registry channel object from the session hash table. RCU read |
| 687 | * side lock MUST be acquired before calling this. |
| 688 | */ |
| 689 | void buffer_reg_channel_remove(struct buffer_reg_session *session, |
| 690 | struct buffer_reg_channel *regp) |
| 691 | { |
| 692 | int ret; |
| 693 | struct lttng_ht_iter iter; |
| 694 | |
| 695 | assert(session); |
| 696 | assert(regp); |
| 697 | |
| 698 | iter.iter.node = ®p->node.node; |
| 699 | ret = lttng_ht_del(session->channels, &iter); |
| 700 | assert(!ret); |
| 701 | } |
| 702 | |
| 703 | /* |
| 704 | * Remove buffer registry map object from the session hash table. RCU read |
| 705 | * side lock MUST be acquired before calling this. |
| 706 | */ |
| 707 | void buffer_reg_map_remove(struct buffer_reg_session *session, |
| 708 | struct buffer_reg_map *regp) |
| 709 | { |
| 710 | int ret; |
| 711 | struct lttng_ht_iter iter; |
| 712 | |
| 713 | assert(session); |
| 714 | assert(regp); |
| 715 | |
| 716 | iter.iter.node = ®p->node.node; |
| 717 | ret = lttng_ht_del(session->maps, &iter); |
| 718 | assert(!ret); |
| 719 | } |
| 720 | |
| 721 | /* |
| 722 | * Destroy a buffer registry channel with the given domain. |
| 723 | */ |
| 724 | void buffer_reg_channel_destroy(struct buffer_reg_channel *regp, |
| 725 | enum lttng_domain_type domain) |
| 726 | { |
| 727 | if (!regp) { |
| 728 | return; |
| 729 | } |
| 730 | |
| 731 | DBG3("Buffer registry channel destroy with key %" PRIu32, regp->key); |
| 732 | |
| 733 | switch (domain) { |
| 734 | case LTTNG_DOMAIN_UST: |
| 735 | { |
| 736 | int ret; |
| 737 | struct buffer_reg_stream *sreg, *stmp; |
| 738 | /* Wipe stream */ |
| 739 | cds_list_for_each_entry_safe(sreg, stmp, ®p->streams, lnode) { |
| 740 | cds_list_del(&sreg->lnode); |
| 741 | regp->stream_count--; |
| 742 | buffer_reg_stream_destroy(sreg, domain); |
| 743 | } |
| 744 | |
| 745 | if (regp->obj.ust) { |
| 746 | ret = ust_app_release_object(NULL, regp->obj.ust); |
| 747 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
| 748 | ERR("Buffer reg channel release obj handle %d failed with ret %d", |
| 749 | regp->obj.ust->handle, ret); |
| 750 | } |
| 751 | free(regp->obj.ust); |
| 752 | } |
| 753 | lttng_fd_put(LTTNG_FD_APPS, 1); |
| 754 | break; |
| 755 | } |
| 756 | default: |
| 757 | assert(0); |
| 758 | } |
| 759 | |
| 760 | free(regp); |
| 761 | return; |
| 762 | } |
| 763 | |
| 764 | /* |
| 765 | * Destroy a buffer registry map with the given domain. |
| 766 | */ |
| 767 | void buffer_reg_map_destroy(struct buffer_reg_map *regp, |
| 768 | enum lttng_domain_type domain) |
| 769 | { |
| 770 | if (!regp) { |
| 771 | return; |
| 772 | } |
| 773 | |
| 774 | DBG3("Buffer registry map destroy with key %" PRIu32, regp->key); |
| 775 | |
| 776 | switch (domain) { |
| 777 | case LTTNG_DOMAIN_UST: |
| 778 | { |
| 779 | int ret; |
| 780 | struct buffer_reg_map_counter *map_counter_reg, *tmp; |
| 781 | /* Wipe counter */ |
| 782 | cds_list_for_each_entry_safe(map_counter_reg, tmp, ®p->counters, lnode) { |
| 783 | cds_list_del(&map_counter_reg->lnode); |
| 784 | regp->counter_count--; |
| 785 | buffer_reg_map_counter_destroy(map_counter_reg, domain); |
| 786 | } |
| 787 | |
| 788 | if (regp->obj.ust) { |
| 789 | ret = ust_app_release_object(NULL, regp->obj.ust); |
| 790 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
| 791 | ERR("Buffer reg map release obj handle %d failed with ret %d", |
| 792 | regp->obj.ust->handle, ret); |
| 793 | } |
| 794 | free(regp->obj.ust); |
| 795 | } |
| 796 | lttng_fd_put(LTTNG_FD_APPS, 1); |
| 797 | break; |
| 798 | } |
| 799 | default: |
| 800 | assert(0); |
| 801 | } |
| 802 | |
| 803 | free(regp); |
| 804 | return; |
| 805 | } |
| 806 | |
| 807 | /* |
| 808 | * Destroy a buffer registry session with the given domain. |
| 809 | * |
| 810 | * Should *NOT* be called with RCU read-side lock held. |
| 811 | */ |
| 812 | static void buffer_reg_session_destroy(struct buffer_reg_session *regp, |
| 813 | enum lttng_domain_type domain) |
| 814 | { |
| 815 | int ret; |
| 816 | struct lttng_ht_iter iter; |
| 817 | struct buffer_reg_channel *reg_chan; |
| 818 | struct buffer_reg_map *reg_map; |
| 819 | |
| 820 | DBG3("Buffer registry session destroy"); |
| 821 | |
| 822 | /* Destroy all channels. */ |
| 823 | rcu_read_lock(); |
| 824 | cds_lfht_for_each_entry(regp->channels->ht, &iter.iter, reg_chan, |
| 825 | node.node) { |
| 826 | ret = lttng_ht_del(regp->channels, &iter); |
| 827 | assert(!ret); |
| 828 | buffer_reg_channel_destroy(reg_chan, domain); |
| 829 | } |
| 830 | cds_lfht_for_each_entry(regp->maps->ht, &iter.iter, reg_map, |
| 831 | node.node) { |
| 832 | ret = lttng_ht_del(regp->maps, &iter); |
| 833 | assert(!ret); |
| 834 | buffer_reg_map_destroy(reg_map, domain); |
| 835 | } |
| 836 | rcu_read_unlock(); |
| 837 | |
| 838 | ht_cleanup_push(regp->channels); |
| 839 | ht_cleanup_push(regp->maps); |
| 840 | |
| 841 | switch (domain) { |
| 842 | case LTTNG_DOMAIN_UST: |
| 843 | ust_registry_session_destroy(regp->reg.ust); |
| 844 | free(regp->reg.ust); |
| 845 | break; |
| 846 | default: |
| 847 | assert(0); |
| 848 | } |
| 849 | |
| 850 | free(regp); |
| 851 | return; |
| 852 | } |
| 853 | |
| 854 | /* |
| 855 | * Remove buffer registry UID object from the global hash table. |
| 856 | */ |
| 857 | void buffer_reg_uid_remove(struct buffer_reg_uid *regp) |
| 858 | { |
| 859 | int ret; |
| 860 | struct lttng_ht_iter iter; |
| 861 | |
| 862 | assert(regp); |
| 863 | |
| 864 | rcu_read_lock(); |
| 865 | iter.iter.node = ®p->node.node; |
| 866 | ret = lttng_ht_del(buffer_registry_uid, &iter); |
| 867 | assert(!ret); |
| 868 | rcu_read_unlock(); |
| 869 | } |
| 870 | |
| 871 | static void rcu_free_buffer_reg_uid(struct rcu_head *head) |
| 872 | { |
| 873 | struct lttng_ht_node_u64 *node = |
| 874 | caa_container_of(head, struct lttng_ht_node_u64, head); |
| 875 | struct buffer_reg_uid *reg = |
| 876 | caa_container_of(node, struct buffer_reg_uid, node); |
| 877 | |
| 878 | buffer_reg_session_destroy(reg->registry, reg->domain); |
| 879 | free(reg); |
| 880 | } |
| 881 | |
| 882 | static void rcu_free_buffer_reg_pid(struct rcu_head *head) |
| 883 | { |
| 884 | struct lttng_ht_node_u64 *node = |
| 885 | caa_container_of(head, struct lttng_ht_node_u64, head); |
| 886 | struct buffer_reg_pid *reg = |
| 887 | caa_container_of(node, struct buffer_reg_pid, node); |
| 888 | |
| 889 | buffer_reg_session_destroy(reg->registry, LTTNG_DOMAIN_UST); |
| 890 | free(reg); |
| 891 | } |
| 892 | |
| 893 | /* |
| 894 | * Destroy buffer registry per UID. The given pointer is NOT removed from any |
| 895 | * list or hash table. Use buffer_reg_pid_remove() before calling this function |
| 896 | * for the case that the object is in the global hash table. |
| 897 | */ |
| 898 | void buffer_reg_uid_destroy(struct buffer_reg_uid *regp, |
| 899 | struct consumer_output *consumer) |
| 900 | { |
| 901 | struct consumer_socket *socket; |
| 902 | |
| 903 | if (!regp) { |
| 904 | return; |
| 905 | } |
| 906 | |
| 907 | DBG3("Buffer registry per UID destroy with id: %" PRIu64 ", ABI: %u, uid: %d", |
| 908 | regp->session_id, regp->bits_per_long, regp->uid); |
| 909 | |
| 910 | if (!consumer) { |
| 911 | goto destroy; |
| 912 | } |
| 913 | |
| 914 | rcu_read_lock(); |
| 915 | /* Get the right socket from the consumer object. */ |
| 916 | socket = consumer_find_socket_by_bitness(regp->bits_per_long, |
| 917 | consumer); |
| 918 | if (!socket) { |
| 919 | goto unlock; |
| 920 | } |
| 921 | |
| 922 | switch (regp->domain) { |
| 923 | case LTTNG_DOMAIN_UST: |
| 924 | if (regp->registry->reg.ust->metadata_key) { |
| 925 | /* Return value does not matter. This call will print errors. */ |
| 926 | (void) consumer_close_metadata(socket, |
| 927 | regp->registry->reg.ust->metadata_key); |
| 928 | } |
| 929 | break; |
| 930 | default: |
| 931 | assert(0); |
| 932 | rcu_read_unlock(); |
| 933 | return; |
| 934 | } |
| 935 | |
| 936 | unlock: |
| 937 | rcu_read_unlock(); |
| 938 | destroy: |
| 939 | call_rcu(®p->node.head, rcu_free_buffer_reg_uid); |
| 940 | } |
| 941 | |
| 942 | /* |
| 943 | * Remove buffer registry UID object from the global hash table. RCU read side |
| 944 | * lock MUST be acquired before calling this. |
| 945 | */ |
| 946 | void buffer_reg_pid_remove(struct buffer_reg_pid *regp) |
| 947 | { |
| 948 | int ret; |
| 949 | struct lttng_ht_iter iter; |
| 950 | |
| 951 | assert(regp); |
| 952 | |
| 953 | iter.iter.node = ®p->node.node; |
| 954 | ret = lttng_ht_del(buffer_registry_pid, &iter); |
| 955 | assert(!ret); |
| 956 | } |
| 957 | |
| 958 | /* |
| 959 | * Destroy buffer registry per PID. The pointer is NOT removed from the global |
| 960 | * hash table. Call buffer_reg_pid_remove() before that if the object was |
| 961 | * previously added to the global hash table. |
| 962 | */ |
| 963 | void buffer_reg_pid_destroy(struct buffer_reg_pid *regp) |
| 964 | { |
| 965 | if (!regp) { |
| 966 | return; |
| 967 | } |
| 968 | |
| 969 | DBG3("Buffer registry per PID destroy with id: %" PRIu64, |
| 970 | regp->session_id); |
| 971 | |
| 972 | /* This registry is only used by UST. */ |
| 973 | call_rcu(®p->node.head, rcu_free_buffer_reg_pid); |
| 974 | } |
| 975 | |
| 976 | /* |
| 977 | * Destroy per PID and UID registry hash table. |
| 978 | * |
| 979 | * Should *NOT* be called with RCU read-side lock held. |
| 980 | */ |
| 981 | void buffer_reg_destroy_registries(void) |
| 982 | { |
| 983 | DBG3("Buffer registry destroy all registry"); |
| 984 | ht_cleanup_push(buffer_registry_uid); |
| 985 | ht_cleanup_push(buffer_registry_pid); |
| 986 | } |