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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 | |
19 | #include <inttypes.h> | |
20 | ||
21 | #include <common/common.h> | |
22 | #include <common/hashtable/utils.h> | |
23 | ||
24 | #include "buffer-registry.h" | |
25 | #include "fd-limit.h" | |
26 | #include "ust-consumer.h" | |
27 | #include "ust-ctl.h" | |
0b2dc8df | 28 | #include "utils.h" |
7972aab2 DG |
29 | |
30 | /* | |
31 | * Set in main.c during initialization process of the daemon. This contains | |
32 | * buffer_reg_uid object which are global registry for per UID buffer. Object | |
33 | * are indexed by session id and matched by the triplet | |
34 | * <session_id/bits_per_long/uid>. | |
35 | */ | |
36 | static struct lttng_ht *buffer_registry_uid; | |
37 | ||
38 | /* | |
39 | * Initialized at the daemon start. This contains buffer_reg_pid object and | |
40 | * indexed by session id. | |
41 | */ | |
42 | static struct lttng_ht *buffer_registry_pid; | |
43 | ||
44 | /* | |
45 | * Match function for the per UID registry hash table. It matches a registry | |
46 | * uid object with the triplet <session_id/abi/uid>. | |
47 | */ | |
48 | static int ht_match_reg_uid(struct cds_lfht_node *node, const void *_key) | |
49 | { | |
50 | struct buffer_reg_uid *reg; | |
51 | const struct buffer_reg_uid *key; | |
52 | ||
53 | assert(node); | |
54 | assert(_key); | |
55 | ||
56 | reg = caa_container_of(node, struct buffer_reg_uid, node.node); | |
57 | assert(reg); | |
58 | key = _key; | |
59 | ||
60 | if (key->session_id != reg->session_id || | |
61 | key->bits_per_long != reg->bits_per_long || | |
62 | key->uid != reg->uid) { | |
63 | goto no_match; | |
64 | } | |
65 | ||
66 | /* Match */ | |
67 | return 1; | |
68 | no_match: | |
69 | return 0; | |
70 | } | |
71 | ||
72 | /* | |
73 | * Hash function for the per UID registry hash table. This XOR the triplet | |
74 | * together. | |
75 | */ | |
76 | static unsigned long ht_hash_reg_uid(void *_key, unsigned long seed) | |
77 | { | |
78 | uint64_t xored_key; | |
79 | struct buffer_reg_uid *key = _key; | |
80 | ||
81 | assert(key); | |
82 | ||
83 | xored_key = (uint64_t)(key->session_id ^ key->bits_per_long ^ key->uid); | |
84 | return hash_key_u64(&xored_key, seed); | |
85 | } | |
86 | ||
87 | /* | |
88 | * Initialize global buffer per UID registry. Should only be called ONCE!. | |
89 | */ | |
90 | void buffer_reg_init_uid_registry(void) | |
91 | { | |
92 | /* Should be called once. */ | |
93 | assert(!buffer_registry_uid); | |
94 | buffer_registry_uid = lttng_ht_new(0, LTTNG_HT_TYPE_U64); | |
95 | assert(buffer_registry_uid); | |
96 | buffer_registry_uid->match_fct = ht_match_reg_uid; | |
97 | buffer_registry_uid->hash_fct = ht_hash_reg_uid; | |
98 | ||
99 | DBG3("Global buffer per UID registry initialized"); | |
100 | } | |
101 | ||
102 | /* | |
103 | * Allocate and initialize object. Set regp with the object pointer. | |
104 | * | |
105 | * Return 0 on success else a negative value and regp is untouched. | |
106 | */ | |
107 | int buffer_reg_uid_create(int session_id, uint32_t bits_per_long, uid_t uid, | |
108 | enum lttng_domain_type domain, struct buffer_reg_uid **regp) | |
109 | { | |
110 | int ret = 0; | |
111 | struct buffer_reg_uid *reg = NULL; | |
112 | ||
113 | assert(regp); | |
114 | ||
115 | reg = zmalloc(sizeof(*reg)); | |
116 | if (!reg) { | |
117 | PERROR("zmalloc buffer registry uid"); | |
118 | ret = -ENOMEM; | |
119 | goto error; | |
120 | } | |
121 | ||
122 | reg->registry = zmalloc(sizeof(struct buffer_reg_session)); | |
63c861bd | 123 | if (!reg->registry) { |
7972aab2 DG |
124 | PERROR("zmalloc buffer registry uid session"); |
125 | ret = -ENOMEM; | |
126 | goto error; | |
127 | } | |
128 | ||
129 | reg->session_id = session_id; | |
130 | reg->bits_per_long = bits_per_long; | |
131 | reg->uid = uid; | |
132 | reg->domain = domain; | |
133 | ||
134 | reg->registry->channels = lttng_ht_new(0, LTTNG_HT_TYPE_U64); | |
135 | if (!reg->registry->channels) { | |
136 | ret = -ENOMEM; | |
137 | goto error_session; | |
138 | } | |
139 | ||
140 | cds_lfht_node_init(®->node.node); | |
141 | *regp = reg; | |
142 | ||
143 | DBG3("Buffer registry per UID created id: %d, ABI: %u, uid: %d, domain: %d", | |
144 | session_id, bits_per_long, uid, domain); | |
145 | ||
146 | return 0; | |
147 | ||
148 | error_session: | |
149 | free(reg->registry); | |
150 | error: | |
151 | free(reg); | |
152 | return ret; | |
153 | } | |
154 | ||
155 | /* | |
156 | * Add a buffer registry per UID object to the global registry. | |
157 | */ | |
158 | void buffer_reg_uid_add(struct buffer_reg_uid *reg) | |
159 | { | |
160 | struct cds_lfht_node *nodep; | |
161 | struct lttng_ht *ht = buffer_registry_uid; | |
162 | ||
163 | assert(reg); | |
164 | ||
165 | DBG3("Buffer registry per UID adding to global registry with id: %d", | |
166 | reg->session_id); | |
167 | ||
168 | rcu_read_lock(); | |
169 | nodep = cds_lfht_add_unique(ht->ht, ht->hash_fct(reg, lttng_ht_seed), | |
170 | ht->match_fct, reg, ®->node.node); | |
171 | assert(nodep == ®->node.node); | |
172 | rcu_read_unlock(); | |
173 | } | |
174 | ||
175 | /* | |
176 | * Find a buffer registry per UID object with given params. RCU read side lock | |
177 | * MUST be acquired before calling this and hold on to protect the object. | |
178 | * | |
179 | * Return the object pointer or NULL on error. | |
180 | */ | |
181 | struct buffer_reg_uid *buffer_reg_uid_find(int session_id, | |
182 | uint32_t bits_per_long, uid_t uid) | |
183 | { | |
184 | struct lttng_ht_node_u64 *node; | |
185 | struct lttng_ht_iter iter; | |
186 | struct buffer_reg_uid *reg = NULL, key; | |
187 | struct lttng_ht *ht = buffer_registry_uid; | |
188 | ||
189 | /* Setup key we are looking for. */ | |
190 | key.session_id = session_id; | |
191 | key.bits_per_long = bits_per_long; | |
192 | key.uid = uid; | |
193 | ||
194 | DBG3("Buffer registry per UID find id: %d, ABI: %u, uid: %d", | |
195 | session_id, bits_per_long, uid); | |
196 | ||
197 | /* Custom lookup function since it's a different key. */ | |
198 | cds_lfht_lookup(ht->ht, ht->hash_fct(&key, lttng_ht_seed), ht->match_fct, | |
199 | &key, &iter.iter); | |
200 | node = lttng_ht_iter_get_node_u64(&iter); | |
201 | if (!node) { | |
202 | goto end; | |
203 | } | |
204 | reg = caa_container_of(node, struct buffer_reg_uid, node); | |
205 | ||
206 | end: | |
207 | return reg; | |
208 | } | |
209 | ||
210 | /* | |
211 | * Initialize global buffer per PID registry. Should only be called ONCE!. | |
212 | */ | |
213 | void buffer_reg_init_pid_registry(void) | |
214 | { | |
215 | /* Should be called once. */ | |
216 | assert(!buffer_registry_pid); | |
217 | buffer_registry_pid = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); | |
218 | assert(buffer_registry_pid); | |
219 | ||
220 | DBG3("Global buffer per PID registry initialized"); | |
221 | } | |
222 | ||
223 | /* | |
224 | * Allocate and initialize object. Set regp with the object pointer. | |
225 | * | |
226 | * Return 0 on success else a negative value and regp is untouched. | |
227 | */ | |
228 | int buffer_reg_pid_create(int session_id, struct buffer_reg_pid **regp) | |
229 | { | |
230 | int ret = 0; | |
231 | struct buffer_reg_pid *reg = NULL; | |
232 | ||
233 | assert(regp); | |
234 | ||
235 | reg = zmalloc(sizeof(*reg)); | |
236 | if (!reg) { | |
237 | PERROR("zmalloc buffer registry pid"); | |
238 | ret = -ENOMEM; | |
239 | goto error; | |
240 | } | |
241 | ||
242 | reg->registry = zmalloc(sizeof(struct buffer_reg_session)); | |
63c861bd | 243 | if (!reg->registry) { |
7972aab2 DG |
244 | PERROR("zmalloc buffer registry pid session"); |
245 | ret = -ENOMEM; | |
246 | goto error; | |
247 | } | |
248 | ||
249 | /* A cast is done here so we can use the session ID as a u64 ht node. */ | |
250 | reg->session_id = session_id; | |
251 | ||
252 | reg->registry->channels = lttng_ht_new(0, LTTNG_HT_TYPE_U64); | |
253 | if (!reg->registry->channels) { | |
254 | ret = -ENOMEM; | |
255 | goto error_session; | |
256 | } | |
257 | ||
258 | lttng_ht_node_init_ulong(®->node, reg->session_id); | |
259 | *regp = reg; | |
260 | ||
261 | DBG3("Buffer registry per PID created with session id: %d", session_id); | |
262 | ||
263 | return 0; | |
264 | ||
265 | error_session: | |
266 | free(reg->registry); | |
267 | error: | |
268 | free(reg); | |
269 | return ret; | |
270 | } | |
271 | ||
272 | /* | |
273 | * Add a buffer registry per PID object to the global registry. | |
274 | */ | |
275 | void buffer_reg_pid_add(struct buffer_reg_pid *reg) | |
276 | { | |
277 | assert(reg); | |
278 | ||
279 | DBG3("Buffer registry per PID adding to global registry with id: %d", | |
280 | reg->session_id); | |
281 | ||
282 | rcu_read_lock(); | |
283 | lttng_ht_add_unique_ulong(buffer_registry_pid, ®->node); | |
284 | rcu_read_unlock(); | |
285 | } | |
286 | ||
287 | /* | |
288 | * Find a buffer registry per PID object with given params. RCU read side lock | |
289 | * MUST be acquired before calling this and hold on to protect the object. | |
290 | * | |
291 | * Return the object pointer or NULL on error. | |
292 | */ | |
293 | struct buffer_reg_pid *buffer_reg_pid_find(int session_id) | |
294 | { | |
295 | struct lttng_ht_node_ulong *node; | |
296 | struct lttng_ht_iter iter; | |
297 | struct buffer_reg_pid *reg = NULL; | |
298 | struct lttng_ht *ht = buffer_registry_pid; | |
299 | ||
300 | DBG3("Buffer registry per PID find id: %d", session_id); | |
301 | ||
302 | lttng_ht_lookup(ht, (void *)((unsigned long) session_id), &iter); | |
303 | node = lttng_ht_iter_get_node_ulong(&iter); | |
304 | if (!node) { | |
305 | goto end; | |
306 | } | |
307 | reg = caa_container_of(node, struct buffer_reg_pid, node); | |
308 | ||
309 | end: | |
310 | return reg; | |
311 | } | |
312 | ||
313 | /* | |
314 | * Allocate and initialize a buffer registry channel with the given key. Set | |
315 | * regp with the object pointer. | |
316 | * | |
317 | * Return 0 on success or else a negative value keeping regp untouched. | |
318 | */ | |
319 | int buffer_reg_channel_create(uint64_t key, struct buffer_reg_channel **regp) | |
320 | { | |
321 | struct buffer_reg_channel *reg; | |
322 | ||
323 | assert(regp); | |
324 | ||
325 | DBG3("Buffer registry channel create with key: %" PRIu64, key); | |
326 | ||
327 | reg = zmalloc(sizeof(*reg)); | |
328 | if (!reg) { | |
329 | PERROR("zmalloc buffer registry channel"); | |
330 | return -ENOMEM; | |
331 | } | |
332 | ||
333 | reg->key = key; | |
334 | CDS_INIT_LIST_HEAD(®->streams); | |
335 | pthread_mutex_init(®->stream_list_lock, NULL); | |
336 | ||
337 | lttng_ht_node_init_u64(®->node, key); | |
338 | *regp = reg; | |
339 | ||
340 | return 0; | |
341 | } | |
342 | ||
343 | /* | |
344 | * Allocate and initialize a buffer registry stream. Set regp with the object | |
345 | * pointer. | |
346 | * | |
347 | * Return 0 on success or else a negative value keeping regp untouched. | |
348 | */ | |
349 | int buffer_reg_stream_create(struct buffer_reg_stream **regp) | |
350 | { | |
351 | struct buffer_reg_stream *reg; | |
352 | ||
353 | assert(regp); | |
354 | ||
355 | DBG3("Buffer registry creating stream"); | |
356 | ||
357 | reg = zmalloc(sizeof(*reg)); | |
358 | if (!reg) { | |
359 | PERROR("zmalloc buffer registry stream"); | |
360 | return -ENOMEM; | |
361 | } | |
362 | ||
363 | *regp = reg; | |
364 | ||
365 | return 0; | |
366 | } | |
367 | ||
368 | /* | |
369 | * Add stream to the list in the channel. | |
370 | */ | |
371 | void buffer_reg_stream_add(struct buffer_reg_stream *stream, | |
372 | struct buffer_reg_channel *channel) | |
373 | { | |
374 | assert(stream); | |
375 | assert(channel); | |
376 | ||
377 | pthread_mutex_lock(&channel->stream_list_lock); | |
378 | cds_list_add_tail(&stream->lnode, &channel->streams); | |
379 | pthread_mutex_unlock(&channel->stream_list_lock); | |
380 | } | |
381 | ||
382 | /* | |
383 | * Add a buffer registry channel object to the given session. | |
384 | */ | |
385 | void buffer_reg_channel_add(struct buffer_reg_session *session, | |
386 | struct buffer_reg_channel *channel) | |
387 | { | |
388 | assert(session); | |
389 | assert(channel); | |
390 | ||
391 | rcu_read_lock(); | |
392 | lttng_ht_add_unique_u64(session->channels, &channel->node); | |
393 | rcu_read_unlock(); | |
394 | } | |
395 | ||
396 | /* | |
397 | * Find a buffer registry channel object with the given key. RCU read side lock | |
398 | * MUST be acquired and hold on until the object reference is not needed | |
399 | * anymore. | |
400 | * | |
401 | * Return the object pointer or NULL on error. | |
402 | */ | |
403 | struct buffer_reg_channel *buffer_reg_channel_find(uint64_t key, | |
404 | struct buffer_reg_uid *reg) | |
405 | { | |
406 | struct lttng_ht_node_u64 *node; | |
407 | struct lttng_ht_iter iter; | |
408 | struct buffer_reg_channel *chan = NULL; | |
409 | struct lttng_ht *ht; | |
410 | ||
411 | assert(reg); | |
412 | ||
413 | switch (reg->domain) { | |
414 | case LTTNG_DOMAIN_UST: | |
415 | ht = reg->registry->channels; | |
416 | break; | |
417 | default: | |
418 | assert(0); | |
419 | goto end; | |
420 | } | |
421 | ||
422 | lttng_ht_lookup(ht, &key, &iter); | |
423 | node = lttng_ht_iter_get_node_u64(&iter); | |
424 | if (!node) { | |
425 | goto end; | |
426 | } | |
427 | chan = caa_container_of(node, struct buffer_reg_channel, node); | |
428 | ||
429 | end: | |
430 | return chan; | |
431 | } | |
432 | ||
433 | /* | |
434 | * Destroy a buffer registry stream with the given domain. | |
435 | */ | |
436 | void buffer_reg_stream_destroy(struct buffer_reg_stream *regp, | |
437 | enum lttng_domain_type domain) | |
438 | { | |
439 | if (!regp) { | |
440 | return; | |
441 | } | |
442 | ||
443 | DBG3("Buffer registry stream destroy with handle %d", | |
444 | regp->obj.ust->handle); | |
445 | ||
446 | switch (domain) { | |
447 | case LTTNG_DOMAIN_UST: | |
448 | { | |
449 | int ret; | |
450 | ||
451 | ret = ust_ctl_release_object(-1, regp->obj.ust); | |
452 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
453 | ERR("Buffer reg stream release obj handle %d failed with ret %d", | |
454 | regp->obj.ust->handle, ret); | |
455 | } | |
456 | free(regp->obj.ust); | |
457 | lttng_fd_put(LTTNG_FD_APPS, 2); | |
458 | break; | |
459 | } | |
460 | default: | |
461 | assert(0); | |
462 | } | |
463 | ||
464 | free(regp); | |
465 | return; | |
466 | } | |
467 | ||
468 | /* | |
469 | * Remove buffer registry channel object from the session hash table. RCU read | |
470 | * side lock MUST be acquired before calling this. | |
471 | */ | |
472 | void buffer_reg_channel_remove(struct buffer_reg_session *session, | |
473 | struct buffer_reg_channel *regp) | |
474 | { | |
475 | int ret; | |
476 | struct lttng_ht_iter iter; | |
477 | ||
478 | assert(session); | |
479 | assert(regp); | |
480 | ||
481 | iter.iter.node = ®p->node.node; | |
482 | ret = lttng_ht_del(session->channels, &iter); | |
483 | assert(!ret); | |
484 | } | |
485 | ||
486 | /* | |
487 | * Destroy a buffer registry channel with the given domain. | |
488 | */ | |
489 | void buffer_reg_channel_destroy(struct buffer_reg_channel *regp, | |
490 | enum lttng_domain_type domain) | |
491 | { | |
492 | if (!regp) { | |
493 | return; | |
494 | } | |
495 | ||
07d2ae95 | 496 | DBG3("Buffer registry channel destroy with key %" PRIu32, regp->key); |
7972aab2 DG |
497 | |
498 | switch (domain) { | |
499 | case LTTNG_DOMAIN_UST: | |
500 | { | |
501 | int ret; | |
502 | struct buffer_reg_stream *sreg, *stmp; | |
503 | /* Wipe stream */ | |
504 | cds_list_for_each_entry_safe(sreg, stmp, ®p->streams, lnode) { | |
505 | cds_list_del(&sreg->lnode); | |
506 | buffer_reg_stream_destroy(sreg, domain); | |
507 | } | |
508 | ||
55d7e860 MD |
509 | if (regp->obj.ust) { |
510 | ret = ust_ctl_release_object(-1, regp->obj.ust); | |
511 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
512 | ERR("Buffer reg channel release obj handle %d failed with ret %d", | |
513 | regp->obj.ust->handle, ret); | |
514 | } | |
515 | free(regp->obj.ust); | |
7972aab2 | 516 | } |
7972aab2 DG |
517 | lttng_fd_put(LTTNG_FD_APPS, 1); |
518 | break; | |
519 | } | |
520 | default: | |
521 | assert(0); | |
522 | } | |
523 | ||
524 | free(regp); | |
525 | return; | |
526 | } | |
527 | ||
528 | /* | |
529 | * Destroy a buffer registry session with the given domain. | |
36b588ed MD |
530 | * |
531 | * Should *NOT* be called with RCU read-side lock held. | |
7972aab2 | 532 | */ |
36b588ed | 533 | static void buffer_reg_session_destroy(struct buffer_reg_session *regp, |
7972aab2 DG |
534 | enum lttng_domain_type domain) |
535 | { | |
536 | int ret; | |
537 | struct lttng_ht_iter iter; | |
538 | struct buffer_reg_channel *reg_chan; | |
539 | ||
540 | DBG3("Buffer registry session destroy"); | |
541 | ||
542 | /* Destroy all channels. */ | |
543 | rcu_read_lock(); | |
544 | cds_lfht_for_each_entry(regp->channels->ht, &iter.iter, reg_chan, | |
545 | node.node) { | |
546 | ret = lttng_ht_del(regp->channels, &iter); | |
547 | assert(!ret); | |
548 | buffer_reg_channel_destroy(reg_chan, domain); | |
549 | } | |
7972aab2 DG |
550 | rcu_read_unlock(); |
551 | ||
0b2dc8df | 552 | ht_cleanup_push(regp->channels); |
36b588ed | 553 | |
7972aab2 DG |
554 | switch (domain) { |
555 | case LTTNG_DOMAIN_UST: | |
556 | ust_registry_session_destroy(regp->reg.ust); | |
557 | free(regp->reg.ust); | |
558 | break; | |
559 | default: | |
560 | assert(0); | |
561 | } | |
562 | ||
563 | free(regp); | |
564 | return; | |
565 | } | |
566 | ||
567 | /* | |
36b588ed | 568 | * Remove buffer registry UID object from the global hash table. |
7972aab2 DG |
569 | */ |
570 | void buffer_reg_uid_remove(struct buffer_reg_uid *regp) | |
571 | { | |
572 | int ret; | |
573 | struct lttng_ht_iter iter; | |
574 | ||
575 | assert(regp); | |
576 | ||
36b588ed | 577 | rcu_read_lock(); |
7972aab2 DG |
578 | iter.iter.node = ®p->node.node; |
579 | ret = lttng_ht_del(buffer_registry_uid, &iter); | |
580 | assert(!ret); | |
36b588ed | 581 | rcu_read_unlock(); |
7972aab2 DG |
582 | } |
583 | ||
584 | static void rcu_free_buffer_reg_uid(struct rcu_head *head) | |
585 | { | |
586 | struct lttng_ht_node_u64 *node = | |
587 | caa_container_of(head, struct lttng_ht_node_u64, head); | |
588 | struct buffer_reg_uid *reg = | |
589 | caa_container_of(node, struct buffer_reg_uid, node); | |
590 | ||
591 | buffer_reg_session_destroy(reg->registry, reg->domain); | |
592 | free(reg); | |
593 | } | |
594 | ||
595 | static void rcu_free_buffer_reg_pid(struct rcu_head *head) | |
596 | { | |
597 | struct lttng_ht_node_ulong *node = | |
598 | caa_container_of(head, struct lttng_ht_node_ulong, head); | |
599 | struct buffer_reg_pid *reg = | |
600 | caa_container_of(node, struct buffer_reg_pid, node); | |
601 | ||
602 | buffer_reg_session_destroy(reg->registry, LTTNG_DOMAIN_UST); | |
603 | free(reg); | |
604 | } | |
605 | ||
606 | /* | |
607 | * Destroy buffer registry per UID. The given pointer is NOT removed from any | |
608 | * list or hash table. Use buffer_reg_pid_remove() before calling this function | |
609 | * for the case that the object is in the global hash table. | |
610 | */ | |
611 | void buffer_reg_uid_destroy(struct buffer_reg_uid *regp, | |
612 | struct consumer_output *consumer) | |
613 | { | |
614 | struct consumer_socket *socket; | |
615 | ||
616 | if (!regp) { | |
617 | return; | |
618 | } | |
619 | ||
620 | DBG3("Buffer registry per UID destroy with id: %d, ABI: %u, uid: %d", | |
621 | regp->session_id, regp->bits_per_long, regp->uid); | |
622 | ||
623 | if (!consumer) { | |
624 | goto destroy; | |
625 | } | |
626 | ||
36b588ed | 627 | rcu_read_lock(); |
7972aab2 DG |
628 | /* Get the right socket from the consumer object. */ |
629 | socket = consumer_find_socket_by_bitness(regp->bits_per_long, | |
630 | consumer); | |
631 | if (!socket) { | |
36b588ed | 632 | goto unlock; |
7972aab2 DG |
633 | } |
634 | ||
635 | switch (regp->domain) { | |
636 | case LTTNG_DOMAIN_UST: | |
637 | if (regp->registry->reg.ust->metadata_key) { | |
638 | /* Return value does not matter. This call will print errors. */ | |
639 | (void) consumer_close_metadata(socket, | |
640 | regp->registry->reg.ust->metadata_key); | |
641 | } | |
642 | break; | |
643 | default: | |
644 | assert(0); | |
36b588ed | 645 | rcu_read_unlock(); |
7972aab2 DG |
646 | return; |
647 | } | |
648 | ||
36b588ed MD |
649 | unlock: |
650 | rcu_read_unlock(); | |
7972aab2 DG |
651 | destroy: |
652 | call_rcu(®p->node.head, rcu_free_buffer_reg_uid); | |
653 | } | |
654 | ||
655 | /* | |
656 | * Remove buffer registry UID object from the global hash table. RCU read side | |
657 | * lock MUST be acquired before calling this. | |
658 | */ | |
659 | void buffer_reg_pid_remove(struct buffer_reg_pid *regp) | |
660 | { | |
661 | int ret; | |
662 | struct lttng_ht_iter iter; | |
663 | ||
664 | assert(regp); | |
665 | ||
666 | iter.iter.node = ®p->node.node; | |
667 | ret = lttng_ht_del(buffer_registry_pid, &iter); | |
668 | assert(!ret); | |
669 | } | |
670 | ||
671 | /* | |
672 | * Destroy buffer registry per PID. The pointer is NOT removed from the global | |
673 | * hash table. Call buffer_reg_pid_remove() before that if the object was | |
674 | * previously added to the global hash table. | |
675 | */ | |
676 | void buffer_reg_pid_destroy(struct buffer_reg_pid *regp) | |
677 | { | |
678 | if (!regp) { | |
679 | return; | |
680 | } | |
681 | ||
682 | DBG3("Buffer registry per PID destroy with id: %d", regp->session_id); | |
683 | ||
684 | /* This registry is only used by UST. */ | |
685 | call_rcu(®p->node.head, rcu_free_buffer_reg_pid); | |
686 | } | |
687 | ||
688 | /* | |
689 | * Destroy per PID and UID registry hash table. | |
36b588ed MD |
690 | * |
691 | * Should *NOT* be called with RCU read-side lock held. | |
7972aab2 DG |
692 | */ |
693 | void buffer_reg_destroy_registries(void) | |
694 | { | |
695 | DBG3("Buffer registry destroy all registry"); | |
0b2dc8df MD |
696 | ht_cleanup_push(buffer_registry_uid); |
697 | ht_cleanup_push(buffer_registry_pid); | |
7972aab2 | 698 | } |