Commit | Line | Data |
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7972aab2 DG |
1 | /* |
2 | * Copyright (C) 2013 - David Goulet <dgoulet@efficios.com> | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify it | |
5 | * under the terms of the GNU General Public License, version 2 only, as | |
6 | * published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, but WITHOUT | |
9 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
10 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
11 | * more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public License along with | |
14 | * this program; if not, write to the Free Software Foundation, Inc., 51 | |
15 | * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
16 | */ | |
17 | ||
18 | #define _GNU_SOURCE | |
6c1c0768 | 19 | #define _LGPL_SOURCE |
7972aab2 DG |
20 | #include <inttypes.h> |
21 | ||
22 | #include <common/common.h> | |
23 | #include <common/hashtable/utils.h> | |
24 | ||
25 | #include "buffer-registry.h" | |
26 | #include "fd-limit.h" | |
27 | #include "ust-consumer.h" | |
28 | #include "ust-ctl.h" | |
0b2dc8df | 29 | #include "utils.h" |
7972aab2 DG |
30 | |
31 | /* | |
32 | * Set in main.c during initialization process of the daemon. This contains | |
33 | * buffer_reg_uid object which are global registry for per UID buffer. Object | |
34 | * are indexed by session id and matched by the triplet | |
35 | * <session_id/bits_per_long/uid>. | |
36 | */ | |
37 | static struct lttng_ht *buffer_registry_uid; | |
38 | ||
39 | /* | |
40 | * Initialized at the daemon start. This contains buffer_reg_pid object and | |
41 | * indexed by session id. | |
42 | */ | |
43 | static struct lttng_ht *buffer_registry_pid; | |
44 | ||
45 | /* | |
46 | * Match function for the per UID registry hash table. It matches a registry | |
47 | * uid object with the triplet <session_id/abi/uid>. | |
48 | */ | |
49 | static int ht_match_reg_uid(struct cds_lfht_node *node, const void *_key) | |
50 | { | |
51 | struct buffer_reg_uid *reg; | |
52 | const struct buffer_reg_uid *key; | |
53 | ||
54 | assert(node); | |
55 | assert(_key); | |
56 | ||
57 | reg = caa_container_of(node, struct buffer_reg_uid, node.node); | |
58 | assert(reg); | |
59 | key = _key; | |
60 | ||
61 | if (key->session_id != reg->session_id || | |
62 | key->bits_per_long != reg->bits_per_long || | |
63 | key->uid != reg->uid) { | |
64 | goto no_match; | |
65 | } | |
66 | ||
67 | /* Match */ | |
68 | return 1; | |
69 | no_match: | |
70 | return 0; | |
71 | } | |
72 | ||
73 | /* | |
74 | * Hash function for the per UID registry hash table. This XOR the triplet | |
75 | * together. | |
76 | */ | |
77 | static unsigned long ht_hash_reg_uid(void *_key, unsigned long seed) | |
78 | { | |
79 | uint64_t xored_key; | |
80 | struct buffer_reg_uid *key = _key; | |
81 | ||
82 | assert(key); | |
83 | ||
84 | xored_key = (uint64_t)(key->session_id ^ key->bits_per_long ^ key->uid); | |
85 | return hash_key_u64(&xored_key, seed); | |
86 | } | |
87 | ||
88 | /* | |
89 | * Initialize global buffer per UID registry. Should only be called ONCE!. | |
90 | */ | |
91 | void buffer_reg_init_uid_registry(void) | |
92 | { | |
93 | /* Should be called once. */ | |
94 | assert(!buffer_registry_uid); | |
95 | buffer_registry_uid = lttng_ht_new(0, LTTNG_HT_TYPE_U64); | |
96 | assert(buffer_registry_uid); | |
97 | buffer_registry_uid->match_fct = ht_match_reg_uid; | |
98 | buffer_registry_uid->hash_fct = ht_hash_reg_uid; | |
99 | ||
100 | DBG3("Global buffer per UID registry initialized"); | |
101 | } | |
102 | ||
103 | /* | |
104 | * Allocate and initialize object. Set regp with the object pointer. | |
105 | * | |
106 | * Return 0 on success else a negative value and regp is untouched. | |
107 | */ | |
d9bf3ca4 | 108 | int buffer_reg_uid_create(uint64_t session_id, uint32_t bits_per_long, uid_t uid, |
d7ba1388 MD |
109 | enum lttng_domain_type domain, struct buffer_reg_uid **regp, |
110 | const char *shm_path) | |
7972aab2 DG |
111 | { |
112 | int ret = 0; | |
113 | struct buffer_reg_uid *reg = NULL; | |
114 | ||
115 | assert(regp); | |
116 | ||
117 | reg = zmalloc(sizeof(*reg)); | |
118 | if (!reg) { | |
119 | PERROR("zmalloc buffer registry uid"); | |
120 | ret = -ENOMEM; | |
121 | goto error; | |
122 | } | |
123 | ||
124 | reg->registry = zmalloc(sizeof(struct buffer_reg_session)); | |
63c861bd | 125 | if (!reg->registry) { |
7972aab2 DG |
126 | PERROR("zmalloc buffer registry uid session"); |
127 | ret = -ENOMEM; | |
128 | goto error; | |
129 | } | |
130 | ||
131 | reg->session_id = session_id; | |
132 | reg->bits_per_long = bits_per_long; | |
133 | reg->uid = uid; | |
134 | reg->domain = domain; | |
d7ba1388 MD |
135 | if (shm_path[0]) { |
136 | strncpy(reg->shm_path, shm_path, sizeof(reg->shm_path)); | |
137 | reg->shm_path[sizeof(reg->shm_path) - 1] = '\0'; | |
138 | DBG3("shm path '%s' is assigned to uid buffer registry for session id %" PRIu64, | |
139 | reg->shm_path, session_id); | |
140 | } | |
7972aab2 DG |
141 | reg->registry->channels = lttng_ht_new(0, LTTNG_HT_TYPE_U64); |
142 | if (!reg->registry->channels) { | |
143 | ret = -ENOMEM; | |
144 | goto error_session; | |
145 | } | |
146 | ||
147 | cds_lfht_node_init(®->node.node); | |
148 | *regp = reg; | |
149 | ||
d9bf3ca4 | 150 | DBG3("Buffer registry per UID created id: %" PRIu64 ", ABI: %u, uid: %d, domain: %d", |
7972aab2 DG |
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 | ||
d9bf3ca4 | 172 | DBG3("Buffer registry per UID adding to global registry with id: %" PRIu64 , |
7972aab2 DG |
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 | */ | |
d9bf3ca4 | 188 | struct buffer_reg_uid *buffer_reg_uid_find(uint64_t session_id, |
7972aab2 DG |
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 | ||
d9bf3ca4 | 201 | DBG3("Buffer registry per UID find id: %" PRIu64 ", ABI: %u, uid: %d", |
7972aab2 DG |
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); | |
d9bf3ca4 | 224 | buffer_registry_pid = lttng_ht_new(0, LTTNG_HT_TYPE_U64); |
7972aab2 DG |
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 | */ | |
d7ba1388 MD |
235 | int buffer_reg_pid_create(uint64_t session_id, struct buffer_reg_pid **regp, |
236 | const char *shm_path) | |
7972aab2 DG |
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)); | |
63c861bd | 251 | if (!reg->registry) { |
7972aab2 DG |
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; | |
d7ba1388 MD |
259 | if (shm_path[0]) { |
260 | strncpy(reg->shm_path, shm_path, sizeof(reg->shm_path)); | |
261 | reg->shm_path[sizeof(reg->shm_path) - 1] = '\0'; | |
262 | DBG3("shm path '%s' is assigned to pid buffer registry for session id %" PRIu64, | |
263 | reg->shm_path, session_id); | |
264 | } | |
7972aab2 DG |
265 | reg->registry->channels = lttng_ht_new(0, LTTNG_HT_TYPE_U64); |
266 | if (!reg->registry->channels) { | |
267 | ret = -ENOMEM; | |
268 | goto error_session; | |
269 | } | |
270 | ||
d9bf3ca4 | 271 | lttng_ht_node_init_u64(®->node, reg->session_id); |
7972aab2 DG |
272 | *regp = reg; |
273 | ||
d9bf3ca4 MD |
274 | DBG3("Buffer registry per PID created with session id: %" PRIu64, |
275 | session_id); | |
7972aab2 DG |
276 | |
277 | return 0; | |
278 | ||
279 | error_session: | |
280 | free(reg->registry); | |
281 | error: | |
282 | free(reg); | |
283 | return ret; | |
284 | } | |
285 | ||
286 | /* | |
287 | * Add a buffer registry per PID object to the global registry. | |
288 | */ | |
289 | void buffer_reg_pid_add(struct buffer_reg_pid *reg) | |
290 | { | |
291 | assert(reg); | |
292 | ||
d9bf3ca4 | 293 | DBG3("Buffer registry per PID adding to global registry with id: %" PRIu64, |
7972aab2 DG |
294 | reg->session_id); |
295 | ||
296 | rcu_read_lock(); | |
d9bf3ca4 | 297 | lttng_ht_add_unique_u64(buffer_registry_pid, ®->node); |
7972aab2 DG |
298 | rcu_read_unlock(); |
299 | } | |
300 | ||
301 | /* | |
302 | * Find a buffer registry per PID object with given params. RCU read side lock | |
303 | * MUST be acquired before calling this and hold on to protect the object. | |
304 | * | |
305 | * Return the object pointer or NULL on error. | |
306 | */ | |
d9bf3ca4 | 307 | struct buffer_reg_pid *buffer_reg_pid_find(uint64_t session_id) |
7972aab2 | 308 | { |
d9bf3ca4 | 309 | struct lttng_ht_node_u64 *node; |
7972aab2 DG |
310 | struct lttng_ht_iter iter; |
311 | struct buffer_reg_pid *reg = NULL; | |
312 | struct lttng_ht *ht = buffer_registry_pid; | |
313 | ||
d9bf3ca4 | 314 | DBG3("Buffer registry per PID find id: %" PRIu64, session_id); |
7972aab2 | 315 | |
d9bf3ca4 MD |
316 | lttng_ht_lookup(ht, &session_id, &iter); |
317 | node = lttng_ht_iter_get_node_u64(&iter); | |
7972aab2 DG |
318 | if (!node) { |
319 | goto end; | |
320 | } | |
321 | reg = caa_container_of(node, struct buffer_reg_pid, node); | |
322 | ||
323 | end: | |
324 | return reg; | |
325 | } | |
326 | ||
327 | /* | |
328 | * Allocate and initialize a buffer registry channel with the given key. Set | |
329 | * regp with the object pointer. | |
330 | * | |
331 | * Return 0 on success or else a negative value keeping regp untouched. | |
332 | */ | |
333 | int buffer_reg_channel_create(uint64_t key, struct buffer_reg_channel **regp) | |
334 | { | |
335 | struct buffer_reg_channel *reg; | |
336 | ||
337 | assert(regp); | |
338 | ||
339 | DBG3("Buffer registry channel create with key: %" PRIu64, key); | |
340 | ||
341 | reg = zmalloc(sizeof(*reg)); | |
342 | if (!reg) { | |
343 | PERROR("zmalloc buffer registry channel"); | |
344 | return -ENOMEM; | |
345 | } | |
346 | ||
347 | reg->key = key; | |
348 | CDS_INIT_LIST_HEAD(®->streams); | |
349 | pthread_mutex_init(®->stream_list_lock, NULL); | |
350 | ||
351 | lttng_ht_node_init_u64(®->node, key); | |
352 | *regp = reg; | |
353 | ||
354 | return 0; | |
355 | } | |
356 | ||
357 | /* | |
358 | * Allocate and initialize a buffer registry stream. Set regp with the object | |
359 | * pointer. | |
360 | * | |
361 | * Return 0 on success or else a negative value keeping regp untouched. | |
362 | */ | |
363 | int buffer_reg_stream_create(struct buffer_reg_stream **regp) | |
364 | { | |
365 | struct buffer_reg_stream *reg; | |
366 | ||
367 | assert(regp); | |
368 | ||
369 | DBG3("Buffer registry creating stream"); | |
370 | ||
371 | reg = zmalloc(sizeof(*reg)); | |
372 | if (!reg) { | |
373 | PERROR("zmalloc buffer registry stream"); | |
374 | return -ENOMEM; | |
375 | } | |
376 | ||
377 | *regp = reg; | |
378 | ||
379 | return 0; | |
380 | } | |
381 | ||
382 | /* | |
383 | * Add stream to the list in the channel. | |
384 | */ | |
385 | void buffer_reg_stream_add(struct buffer_reg_stream *stream, | |
386 | struct buffer_reg_channel *channel) | |
387 | { | |
388 | assert(stream); | |
389 | assert(channel); | |
390 | ||
391 | pthread_mutex_lock(&channel->stream_list_lock); | |
392 | cds_list_add_tail(&stream->lnode, &channel->streams); | |
5c786ded | 393 | channel->stream_count++; |
7972aab2 DG |
394 | pthread_mutex_unlock(&channel->stream_list_lock); |
395 | } | |
396 | ||
397 | /* | |
398 | * Add a buffer registry channel object to the given session. | |
399 | */ | |
400 | void buffer_reg_channel_add(struct buffer_reg_session *session, | |
401 | struct buffer_reg_channel *channel) | |
402 | { | |
403 | assert(session); | |
404 | assert(channel); | |
405 | ||
406 | rcu_read_lock(); | |
407 | lttng_ht_add_unique_u64(session->channels, &channel->node); | |
408 | rcu_read_unlock(); | |
409 | } | |
410 | ||
411 | /* | |
412 | * Find a buffer registry channel object with the given key. RCU read side lock | |
413 | * MUST be acquired and hold on until the object reference is not needed | |
414 | * anymore. | |
415 | * | |
416 | * Return the object pointer or NULL on error. | |
417 | */ | |
418 | struct buffer_reg_channel *buffer_reg_channel_find(uint64_t key, | |
419 | struct buffer_reg_uid *reg) | |
420 | { | |
421 | struct lttng_ht_node_u64 *node; | |
422 | struct lttng_ht_iter iter; | |
423 | struct buffer_reg_channel *chan = NULL; | |
424 | struct lttng_ht *ht; | |
425 | ||
426 | assert(reg); | |
427 | ||
428 | switch (reg->domain) { | |
429 | case LTTNG_DOMAIN_UST: | |
430 | ht = reg->registry->channels; | |
431 | break; | |
432 | default: | |
433 | assert(0); | |
434 | goto end; | |
435 | } | |
436 | ||
437 | lttng_ht_lookup(ht, &key, &iter); | |
438 | node = lttng_ht_iter_get_node_u64(&iter); | |
439 | if (!node) { | |
440 | goto end; | |
441 | } | |
442 | chan = caa_container_of(node, struct buffer_reg_channel, node); | |
443 | ||
444 | end: | |
445 | return chan; | |
446 | } | |
447 | ||
448 | /* | |
449 | * Destroy a buffer registry stream with the given domain. | |
450 | */ | |
451 | void buffer_reg_stream_destroy(struct buffer_reg_stream *regp, | |
452 | enum lttng_domain_type domain) | |
453 | { | |
454 | if (!regp) { | |
455 | return; | |
456 | } | |
457 | ||
458 | DBG3("Buffer registry stream destroy with handle %d", | |
459 | regp->obj.ust->handle); | |
460 | ||
461 | switch (domain) { | |
462 | case LTTNG_DOMAIN_UST: | |
463 | { | |
464 | int ret; | |
465 | ||
466 | ret = ust_ctl_release_object(-1, regp->obj.ust); | |
467 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
468 | ERR("Buffer reg stream release obj handle %d failed with ret %d", | |
469 | regp->obj.ust->handle, ret); | |
470 | } | |
471 | free(regp->obj.ust); | |
472 | lttng_fd_put(LTTNG_FD_APPS, 2); | |
473 | break; | |
474 | } | |
475 | default: | |
476 | assert(0); | |
477 | } | |
478 | ||
479 | free(regp); | |
480 | return; | |
481 | } | |
482 | ||
483 | /* | |
484 | * Remove buffer registry channel object from the session hash table. RCU read | |
485 | * side lock MUST be acquired before calling this. | |
486 | */ | |
487 | void buffer_reg_channel_remove(struct buffer_reg_session *session, | |
488 | struct buffer_reg_channel *regp) | |
489 | { | |
490 | int ret; | |
491 | struct lttng_ht_iter iter; | |
492 | ||
493 | assert(session); | |
494 | assert(regp); | |
495 | ||
496 | iter.iter.node = ®p->node.node; | |
497 | ret = lttng_ht_del(session->channels, &iter); | |
498 | assert(!ret); | |
499 | } | |
500 | ||
501 | /* | |
502 | * Destroy a buffer registry channel with the given domain. | |
503 | */ | |
504 | void buffer_reg_channel_destroy(struct buffer_reg_channel *regp, | |
505 | enum lttng_domain_type domain) | |
506 | { | |
507 | if (!regp) { | |
508 | return; | |
509 | } | |
510 | ||
07d2ae95 | 511 | DBG3("Buffer registry channel destroy with key %" PRIu32, regp->key); |
7972aab2 DG |
512 | |
513 | switch (domain) { | |
514 | case LTTNG_DOMAIN_UST: | |
515 | { | |
516 | int ret; | |
517 | struct buffer_reg_stream *sreg, *stmp; | |
518 | /* Wipe stream */ | |
519 | cds_list_for_each_entry_safe(sreg, stmp, ®p->streams, lnode) { | |
520 | cds_list_del(&sreg->lnode); | |
5c786ded | 521 | regp->stream_count--; |
7972aab2 DG |
522 | buffer_reg_stream_destroy(sreg, domain); |
523 | } | |
524 | ||
55d7e860 MD |
525 | if (regp->obj.ust) { |
526 | ret = ust_ctl_release_object(-1, regp->obj.ust); | |
527 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
528 | ERR("Buffer reg channel release obj handle %d failed with ret %d", | |
529 | regp->obj.ust->handle, ret); | |
530 | } | |
531 | free(regp->obj.ust); | |
7972aab2 | 532 | } |
7972aab2 DG |
533 | lttng_fd_put(LTTNG_FD_APPS, 1); |
534 | break; | |
535 | } | |
536 | default: | |
537 | assert(0); | |
538 | } | |
539 | ||
540 | free(regp); | |
541 | return; | |
542 | } | |
543 | ||
544 | /* | |
545 | * Destroy a buffer registry session with the given domain. | |
36b588ed MD |
546 | * |
547 | * Should *NOT* be called with RCU read-side lock held. | |
7972aab2 | 548 | */ |
36b588ed | 549 | static void buffer_reg_session_destroy(struct buffer_reg_session *regp, |
7972aab2 DG |
550 | enum lttng_domain_type domain) |
551 | { | |
552 | int ret; | |
553 | struct lttng_ht_iter iter; | |
554 | struct buffer_reg_channel *reg_chan; | |
555 | ||
556 | DBG3("Buffer registry session destroy"); | |
557 | ||
558 | /* Destroy all channels. */ | |
559 | rcu_read_lock(); | |
560 | cds_lfht_for_each_entry(regp->channels->ht, &iter.iter, reg_chan, | |
561 | node.node) { | |
562 | ret = lttng_ht_del(regp->channels, &iter); | |
563 | assert(!ret); | |
564 | buffer_reg_channel_destroy(reg_chan, domain); | |
565 | } | |
7972aab2 DG |
566 | rcu_read_unlock(); |
567 | ||
0b2dc8df | 568 | ht_cleanup_push(regp->channels); |
36b588ed | 569 | |
7972aab2 DG |
570 | switch (domain) { |
571 | case LTTNG_DOMAIN_UST: | |
572 | ust_registry_session_destroy(regp->reg.ust); | |
573 | free(regp->reg.ust); | |
574 | break; | |
575 | default: | |
576 | assert(0); | |
577 | } | |
578 | ||
579 | free(regp); | |
580 | return; | |
581 | } | |
582 | ||
583 | /* | |
36b588ed | 584 | * Remove buffer registry UID object from the global hash table. |
7972aab2 DG |
585 | */ |
586 | void buffer_reg_uid_remove(struct buffer_reg_uid *regp) | |
587 | { | |
588 | int ret; | |
589 | struct lttng_ht_iter iter; | |
590 | ||
591 | assert(regp); | |
592 | ||
36b588ed | 593 | rcu_read_lock(); |
7972aab2 DG |
594 | iter.iter.node = ®p->node.node; |
595 | ret = lttng_ht_del(buffer_registry_uid, &iter); | |
596 | assert(!ret); | |
36b588ed | 597 | rcu_read_unlock(); |
7972aab2 DG |
598 | } |
599 | ||
600 | static void rcu_free_buffer_reg_uid(struct rcu_head *head) | |
601 | { | |
602 | struct lttng_ht_node_u64 *node = | |
603 | caa_container_of(head, struct lttng_ht_node_u64, head); | |
604 | struct buffer_reg_uid *reg = | |
605 | caa_container_of(node, struct buffer_reg_uid, node); | |
606 | ||
607 | buffer_reg_session_destroy(reg->registry, reg->domain); | |
608 | free(reg); | |
609 | } | |
610 | ||
611 | static void rcu_free_buffer_reg_pid(struct rcu_head *head) | |
612 | { | |
d9bf3ca4 MD |
613 | struct lttng_ht_node_u64 *node = |
614 | caa_container_of(head, struct lttng_ht_node_u64, head); | |
7972aab2 DG |
615 | struct buffer_reg_pid *reg = |
616 | caa_container_of(node, struct buffer_reg_pid, node); | |
617 | ||
618 | buffer_reg_session_destroy(reg->registry, LTTNG_DOMAIN_UST); | |
619 | free(reg); | |
620 | } | |
621 | ||
622 | /* | |
623 | * Destroy buffer registry per UID. The given pointer is NOT removed from any | |
624 | * list or hash table. Use buffer_reg_pid_remove() before calling this function | |
625 | * for the case that the object is in the global hash table. | |
626 | */ | |
627 | void buffer_reg_uid_destroy(struct buffer_reg_uid *regp, | |
628 | struct consumer_output *consumer) | |
629 | { | |
630 | struct consumer_socket *socket; | |
631 | ||
632 | if (!regp) { | |
633 | return; | |
634 | } | |
635 | ||
d9bf3ca4 | 636 | DBG3("Buffer registry per UID destroy with id: %" PRIu64 ", ABI: %u, uid: %d", |
7972aab2 DG |
637 | regp->session_id, regp->bits_per_long, regp->uid); |
638 | ||
639 | if (!consumer) { | |
640 | goto destroy; | |
641 | } | |
642 | ||
36b588ed | 643 | rcu_read_lock(); |
7972aab2 DG |
644 | /* Get the right socket from the consumer object. */ |
645 | socket = consumer_find_socket_by_bitness(regp->bits_per_long, | |
646 | consumer); | |
647 | if (!socket) { | |
36b588ed | 648 | goto unlock; |
7972aab2 DG |
649 | } |
650 | ||
651 | switch (regp->domain) { | |
652 | case LTTNG_DOMAIN_UST: | |
653 | if (regp->registry->reg.ust->metadata_key) { | |
654 | /* Return value does not matter. This call will print errors. */ | |
655 | (void) consumer_close_metadata(socket, | |
656 | regp->registry->reg.ust->metadata_key); | |
657 | } | |
658 | break; | |
659 | default: | |
660 | assert(0); | |
36b588ed | 661 | rcu_read_unlock(); |
7972aab2 DG |
662 | return; |
663 | } | |
664 | ||
36b588ed MD |
665 | unlock: |
666 | rcu_read_unlock(); | |
7972aab2 DG |
667 | destroy: |
668 | call_rcu(®p->node.head, rcu_free_buffer_reg_uid); | |
669 | } | |
670 | ||
671 | /* | |
672 | * Remove buffer registry UID object from the global hash table. RCU read side | |
673 | * lock MUST be acquired before calling this. | |
674 | */ | |
675 | void buffer_reg_pid_remove(struct buffer_reg_pid *regp) | |
676 | { | |
677 | int ret; | |
678 | struct lttng_ht_iter iter; | |
679 | ||
680 | assert(regp); | |
681 | ||
682 | iter.iter.node = ®p->node.node; | |
683 | ret = lttng_ht_del(buffer_registry_pid, &iter); | |
684 | assert(!ret); | |
685 | } | |
686 | ||
687 | /* | |
688 | * Destroy buffer registry per PID. The pointer is NOT removed from the global | |
689 | * hash table. Call buffer_reg_pid_remove() before that if the object was | |
690 | * previously added to the global hash table. | |
691 | */ | |
692 | void buffer_reg_pid_destroy(struct buffer_reg_pid *regp) | |
693 | { | |
694 | if (!regp) { | |
695 | return; | |
696 | } | |
697 | ||
d9bf3ca4 MD |
698 | DBG3("Buffer registry per PID destroy with id: %" PRIu64, |
699 | regp->session_id); | |
7972aab2 DG |
700 | |
701 | /* This registry is only used by UST. */ | |
702 | call_rcu(®p->node.head, rcu_free_buffer_reg_pid); | |
703 | } | |
704 | ||
705 | /* | |
706 | * Destroy per PID and UID registry hash table. | |
36b588ed MD |
707 | * |
708 | * Should *NOT* be called with RCU read-side lock held. | |
7972aab2 DG |
709 | */ |
710 | void buffer_reg_destroy_registries(void) | |
711 | { | |
712 | DBG3("Buffer registry destroy all registry"); | |
0b2dc8df MD |
713 | ht_cleanup_push(buffer_registry_uid); |
714 | ht_cleanup_push(buffer_registry_pid); | |
7972aab2 | 715 | } |