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 | 109 | enum lttng_domain_type domain, struct buffer_reg_uid **regp, |
3d071855 | 110 | const char *root_shm_path, 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 | 135 | if (shm_path[0]) { |
3d071855 MD |
136 | strncpy(reg->root_shm_path, root_shm_path, sizeof(reg->root_shm_path)); |
137 | reg->root_shm_path[sizeof(reg->root_shm_path) - 1] = '\0'; | |
d7ba1388 MD |
138 | strncpy(reg->shm_path, shm_path, sizeof(reg->shm_path)); |
139 | reg->shm_path[sizeof(reg->shm_path) - 1] = '\0'; | |
140 | DBG3("shm path '%s' is assigned to uid buffer registry for session id %" PRIu64, | |
141 | reg->shm_path, session_id); | |
142 | } | |
7972aab2 DG |
143 | reg->registry->channels = lttng_ht_new(0, LTTNG_HT_TYPE_U64); |
144 | if (!reg->registry->channels) { | |
145 | ret = -ENOMEM; | |
146 | goto error_session; | |
147 | } | |
148 | ||
149 | cds_lfht_node_init(®->node.node); | |
150 | *regp = reg; | |
151 | ||
d9bf3ca4 | 152 | DBG3("Buffer registry per UID created id: %" PRIu64 ", ABI: %u, uid: %d, domain: %d", |
7972aab2 DG |
153 | session_id, bits_per_long, uid, domain); |
154 | ||
155 | return 0; | |
156 | ||
157 | error_session: | |
158 | free(reg->registry); | |
159 | error: | |
160 | free(reg); | |
161 | return ret; | |
162 | } | |
163 | ||
164 | /* | |
165 | * Add a buffer registry per UID object to the global registry. | |
166 | */ | |
167 | void buffer_reg_uid_add(struct buffer_reg_uid *reg) | |
168 | { | |
169 | struct cds_lfht_node *nodep; | |
170 | struct lttng_ht *ht = buffer_registry_uid; | |
171 | ||
172 | assert(reg); | |
173 | ||
d9bf3ca4 | 174 | DBG3("Buffer registry per UID adding to global registry with id: %" PRIu64 , |
7972aab2 DG |
175 | reg->session_id); |
176 | ||
177 | rcu_read_lock(); | |
178 | nodep = cds_lfht_add_unique(ht->ht, ht->hash_fct(reg, lttng_ht_seed), | |
179 | ht->match_fct, reg, ®->node.node); | |
180 | assert(nodep == ®->node.node); | |
181 | rcu_read_unlock(); | |
182 | } | |
183 | ||
184 | /* | |
185 | * Find a buffer registry per UID object with given params. RCU read side lock | |
186 | * MUST be acquired before calling this and hold on to protect the object. | |
187 | * | |
188 | * Return the object pointer or NULL on error. | |
189 | */ | |
d9bf3ca4 | 190 | struct buffer_reg_uid *buffer_reg_uid_find(uint64_t session_id, |
7972aab2 DG |
191 | uint32_t bits_per_long, uid_t uid) |
192 | { | |
193 | struct lttng_ht_node_u64 *node; | |
194 | struct lttng_ht_iter iter; | |
195 | struct buffer_reg_uid *reg = NULL, key; | |
196 | struct lttng_ht *ht = buffer_registry_uid; | |
197 | ||
198 | /* Setup key we are looking for. */ | |
199 | key.session_id = session_id; | |
200 | key.bits_per_long = bits_per_long; | |
201 | key.uid = uid; | |
202 | ||
d9bf3ca4 | 203 | DBG3("Buffer registry per UID find id: %" PRIu64 ", ABI: %u, uid: %d", |
7972aab2 DG |
204 | session_id, bits_per_long, uid); |
205 | ||
206 | /* Custom lookup function since it's a different key. */ | |
207 | cds_lfht_lookup(ht->ht, ht->hash_fct(&key, lttng_ht_seed), ht->match_fct, | |
208 | &key, &iter.iter); | |
209 | node = lttng_ht_iter_get_node_u64(&iter); | |
210 | if (!node) { | |
211 | goto end; | |
212 | } | |
213 | reg = caa_container_of(node, struct buffer_reg_uid, node); | |
214 | ||
215 | end: | |
216 | return reg; | |
217 | } | |
218 | ||
219 | /* | |
220 | * Initialize global buffer per PID registry. Should only be called ONCE!. | |
221 | */ | |
222 | void buffer_reg_init_pid_registry(void) | |
223 | { | |
224 | /* Should be called once. */ | |
225 | assert(!buffer_registry_pid); | |
d9bf3ca4 | 226 | buffer_registry_pid = lttng_ht_new(0, LTTNG_HT_TYPE_U64); |
7972aab2 DG |
227 | assert(buffer_registry_pid); |
228 | ||
229 | DBG3("Global buffer per PID registry initialized"); | |
230 | } | |
231 | ||
232 | /* | |
233 | * Allocate and initialize object. Set regp with the object pointer. | |
234 | * | |
235 | * Return 0 on success else a negative value and regp is untouched. | |
236 | */ | |
d7ba1388 | 237 | int buffer_reg_pid_create(uint64_t session_id, struct buffer_reg_pid **regp, |
3d071855 | 238 | const char *root_shm_path, const char *shm_path) |
7972aab2 DG |
239 | { |
240 | int ret = 0; | |
241 | struct buffer_reg_pid *reg = NULL; | |
242 | ||
243 | assert(regp); | |
244 | ||
245 | reg = zmalloc(sizeof(*reg)); | |
246 | if (!reg) { | |
247 | PERROR("zmalloc buffer registry pid"); | |
248 | ret = -ENOMEM; | |
249 | goto error; | |
250 | } | |
251 | ||
252 | reg->registry = zmalloc(sizeof(struct buffer_reg_session)); | |
63c861bd | 253 | if (!reg->registry) { |
7972aab2 DG |
254 | PERROR("zmalloc buffer registry pid session"); |
255 | ret = -ENOMEM; | |
256 | goto error; | |
257 | } | |
258 | ||
259 | /* A cast is done here so we can use the session ID as a u64 ht node. */ | |
260 | reg->session_id = session_id; | |
d7ba1388 | 261 | if (shm_path[0]) { |
3d071855 MD |
262 | strncpy(reg->root_shm_path, root_shm_path, sizeof(reg->root_shm_path)); |
263 | reg->root_shm_path[sizeof(reg->root_shm_path) - 1] = '\0'; | |
d7ba1388 MD |
264 | strncpy(reg->shm_path, shm_path, sizeof(reg->shm_path)); |
265 | reg->shm_path[sizeof(reg->shm_path) - 1] = '\0'; | |
266 | DBG3("shm path '%s' is assigned to pid buffer registry for session id %" PRIu64, | |
267 | reg->shm_path, session_id); | |
268 | } | |
7972aab2 DG |
269 | reg->registry->channels = lttng_ht_new(0, LTTNG_HT_TYPE_U64); |
270 | if (!reg->registry->channels) { | |
271 | ret = -ENOMEM; | |
272 | goto error_session; | |
273 | } | |
274 | ||
d9bf3ca4 | 275 | lttng_ht_node_init_u64(®->node, reg->session_id); |
7972aab2 DG |
276 | *regp = reg; |
277 | ||
d9bf3ca4 MD |
278 | DBG3("Buffer registry per PID created with session id: %" PRIu64, |
279 | session_id); | |
7972aab2 DG |
280 | |
281 | return 0; | |
282 | ||
283 | error_session: | |
284 | free(reg->registry); | |
285 | error: | |
286 | free(reg); | |
287 | return ret; | |
288 | } | |
289 | ||
290 | /* | |
291 | * Add a buffer registry per PID object to the global registry. | |
292 | */ | |
293 | void buffer_reg_pid_add(struct buffer_reg_pid *reg) | |
294 | { | |
295 | assert(reg); | |
296 | ||
d9bf3ca4 | 297 | DBG3("Buffer registry per PID adding to global registry with id: %" PRIu64, |
7972aab2 DG |
298 | reg->session_id); |
299 | ||
300 | rcu_read_lock(); | |
d9bf3ca4 | 301 | lttng_ht_add_unique_u64(buffer_registry_pid, ®->node); |
7972aab2 DG |
302 | rcu_read_unlock(); |
303 | } | |
304 | ||
305 | /* | |
306 | * Find a buffer registry per PID object with given params. RCU read side lock | |
307 | * MUST be acquired before calling this and hold on to protect the object. | |
308 | * | |
309 | * Return the object pointer or NULL on error. | |
310 | */ | |
d9bf3ca4 | 311 | struct buffer_reg_pid *buffer_reg_pid_find(uint64_t session_id) |
7972aab2 | 312 | { |
d9bf3ca4 | 313 | struct lttng_ht_node_u64 *node; |
7972aab2 DG |
314 | struct lttng_ht_iter iter; |
315 | struct buffer_reg_pid *reg = NULL; | |
316 | struct lttng_ht *ht = buffer_registry_pid; | |
317 | ||
d9bf3ca4 | 318 | DBG3("Buffer registry per PID find id: %" PRIu64, session_id); |
7972aab2 | 319 | |
d9bf3ca4 MD |
320 | lttng_ht_lookup(ht, &session_id, &iter); |
321 | node = lttng_ht_iter_get_node_u64(&iter); | |
7972aab2 DG |
322 | if (!node) { |
323 | goto end; | |
324 | } | |
325 | reg = caa_container_of(node, struct buffer_reg_pid, node); | |
326 | ||
327 | end: | |
328 | return reg; | |
329 | } | |
330 | ||
331 | /* | |
332 | * Allocate and initialize a buffer registry channel with the given key. Set | |
333 | * regp with the object pointer. | |
334 | * | |
335 | * Return 0 on success or else a negative value keeping regp untouched. | |
336 | */ | |
337 | int buffer_reg_channel_create(uint64_t key, struct buffer_reg_channel **regp) | |
338 | { | |
339 | struct buffer_reg_channel *reg; | |
340 | ||
341 | assert(regp); | |
342 | ||
343 | DBG3("Buffer registry channel create with key: %" PRIu64, key); | |
344 | ||
345 | reg = zmalloc(sizeof(*reg)); | |
346 | if (!reg) { | |
347 | PERROR("zmalloc buffer registry channel"); | |
348 | return -ENOMEM; | |
349 | } | |
350 | ||
351 | reg->key = key; | |
352 | CDS_INIT_LIST_HEAD(®->streams); | |
353 | pthread_mutex_init(®->stream_list_lock, NULL); | |
354 | ||
355 | lttng_ht_node_init_u64(®->node, key); | |
356 | *regp = reg; | |
357 | ||
358 | return 0; | |
359 | } | |
360 | ||
361 | /* | |
362 | * Allocate and initialize a buffer registry stream. Set regp with the object | |
363 | * pointer. | |
364 | * | |
365 | * Return 0 on success or else a negative value keeping regp untouched. | |
366 | */ | |
367 | int buffer_reg_stream_create(struct buffer_reg_stream **regp) | |
368 | { | |
369 | struct buffer_reg_stream *reg; | |
370 | ||
371 | assert(regp); | |
372 | ||
373 | DBG3("Buffer registry creating stream"); | |
374 | ||
375 | reg = zmalloc(sizeof(*reg)); | |
376 | if (!reg) { | |
377 | PERROR("zmalloc buffer registry stream"); | |
378 | return -ENOMEM; | |
379 | } | |
380 | ||
381 | *regp = reg; | |
382 | ||
383 | return 0; | |
384 | } | |
385 | ||
386 | /* | |
387 | * Add stream to the list in the channel. | |
388 | */ | |
389 | void buffer_reg_stream_add(struct buffer_reg_stream *stream, | |
390 | struct buffer_reg_channel *channel) | |
391 | { | |
392 | assert(stream); | |
393 | assert(channel); | |
394 | ||
395 | pthread_mutex_lock(&channel->stream_list_lock); | |
396 | cds_list_add_tail(&stream->lnode, &channel->streams); | |
5c786ded | 397 | channel->stream_count++; |
7972aab2 DG |
398 | pthread_mutex_unlock(&channel->stream_list_lock); |
399 | } | |
400 | ||
401 | /* | |
402 | * Add a buffer registry channel object to the given session. | |
403 | */ | |
404 | void buffer_reg_channel_add(struct buffer_reg_session *session, | |
405 | struct buffer_reg_channel *channel) | |
406 | { | |
407 | assert(session); | |
408 | assert(channel); | |
409 | ||
410 | rcu_read_lock(); | |
411 | lttng_ht_add_unique_u64(session->channels, &channel->node); | |
412 | rcu_read_unlock(); | |
413 | } | |
414 | ||
415 | /* | |
416 | * Find a buffer registry channel object with the given key. RCU read side lock | |
417 | * MUST be acquired and hold on until the object reference is not needed | |
418 | * anymore. | |
419 | * | |
420 | * Return the object pointer or NULL on error. | |
421 | */ | |
422 | struct buffer_reg_channel *buffer_reg_channel_find(uint64_t key, | |
423 | struct buffer_reg_uid *reg) | |
424 | { | |
425 | struct lttng_ht_node_u64 *node; | |
426 | struct lttng_ht_iter iter; | |
427 | struct buffer_reg_channel *chan = NULL; | |
428 | struct lttng_ht *ht; | |
429 | ||
430 | assert(reg); | |
431 | ||
432 | switch (reg->domain) { | |
433 | case LTTNG_DOMAIN_UST: | |
434 | ht = reg->registry->channels; | |
435 | break; | |
436 | default: | |
437 | assert(0); | |
438 | goto end; | |
439 | } | |
440 | ||
441 | lttng_ht_lookup(ht, &key, &iter); | |
442 | node = lttng_ht_iter_get_node_u64(&iter); | |
443 | if (!node) { | |
444 | goto end; | |
445 | } | |
446 | chan = caa_container_of(node, struct buffer_reg_channel, node); | |
447 | ||
448 | end: | |
449 | return chan; | |
450 | } | |
451 | ||
452 | /* | |
453 | * Destroy a buffer registry stream with the given domain. | |
454 | */ | |
455 | void buffer_reg_stream_destroy(struct buffer_reg_stream *regp, | |
456 | enum lttng_domain_type domain) | |
457 | { | |
458 | if (!regp) { | |
459 | return; | |
460 | } | |
461 | ||
462 | DBG3("Buffer registry stream destroy with handle %d", | |
463 | regp->obj.ust->handle); | |
464 | ||
465 | switch (domain) { | |
466 | case LTTNG_DOMAIN_UST: | |
467 | { | |
468 | int ret; | |
469 | ||
fb45065e | 470 | ret = ust_app_release_object(NULL, regp->obj.ust); |
7972aab2 DG |
471 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
472 | ERR("Buffer reg stream release obj handle %d failed with ret %d", | |
473 | regp->obj.ust->handle, ret); | |
474 | } | |
475 | free(regp->obj.ust); | |
476 | lttng_fd_put(LTTNG_FD_APPS, 2); | |
477 | break; | |
478 | } | |
479 | default: | |
480 | assert(0); | |
481 | } | |
482 | ||
483 | free(regp); | |
484 | return; | |
485 | } | |
486 | ||
487 | /* | |
488 | * Remove buffer registry channel object from the session hash table. RCU read | |
489 | * side lock MUST be acquired before calling this. | |
490 | */ | |
491 | void buffer_reg_channel_remove(struct buffer_reg_session *session, | |
492 | struct buffer_reg_channel *regp) | |
493 | { | |
494 | int ret; | |
495 | struct lttng_ht_iter iter; | |
496 | ||
497 | assert(session); | |
498 | assert(regp); | |
499 | ||
500 | iter.iter.node = ®p->node.node; | |
501 | ret = lttng_ht_del(session->channels, &iter); | |
502 | assert(!ret); | |
503 | } | |
504 | ||
505 | /* | |
506 | * Destroy a buffer registry channel with the given domain. | |
507 | */ | |
508 | void buffer_reg_channel_destroy(struct buffer_reg_channel *regp, | |
509 | enum lttng_domain_type domain) | |
510 | { | |
511 | if (!regp) { | |
512 | return; | |
513 | } | |
514 | ||
07d2ae95 | 515 | DBG3("Buffer registry channel destroy with key %" PRIu32, regp->key); |
7972aab2 DG |
516 | |
517 | switch (domain) { | |
518 | case LTTNG_DOMAIN_UST: | |
519 | { | |
520 | int ret; | |
521 | struct buffer_reg_stream *sreg, *stmp; | |
522 | /* Wipe stream */ | |
523 | cds_list_for_each_entry_safe(sreg, stmp, ®p->streams, lnode) { | |
524 | cds_list_del(&sreg->lnode); | |
5c786ded | 525 | regp->stream_count--; |
7972aab2 DG |
526 | buffer_reg_stream_destroy(sreg, domain); |
527 | } | |
528 | ||
55d7e860 | 529 | if (regp->obj.ust) { |
fb45065e | 530 | ret = ust_app_release_object(NULL, regp->obj.ust); |
55d7e860 MD |
531 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
532 | ERR("Buffer reg channel release obj handle %d failed with ret %d", | |
533 | regp->obj.ust->handle, ret); | |
534 | } | |
535 | free(regp->obj.ust); | |
7972aab2 | 536 | } |
7972aab2 DG |
537 | lttng_fd_put(LTTNG_FD_APPS, 1); |
538 | break; | |
539 | } | |
540 | default: | |
541 | assert(0); | |
542 | } | |
543 | ||
544 | free(regp); | |
545 | return; | |
546 | } | |
547 | ||
548 | /* | |
549 | * Destroy a buffer registry session with the given domain. | |
36b588ed MD |
550 | * |
551 | * Should *NOT* be called with RCU read-side lock held. | |
7972aab2 | 552 | */ |
36b588ed | 553 | static void buffer_reg_session_destroy(struct buffer_reg_session *regp, |
7972aab2 DG |
554 | enum lttng_domain_type domain) |
555 | { | |
556 | int ret; | |
557 | struct lttng_ht_iter iter; | |
558 | struct buffer_reg_channel *reg_chan; | |
559 | ||
560 | DBG3("Buffer registry session destroy"); | |
561 | ||
562 | /* Destroy all channels. */ | |
563 | rcu_read_lock(); | |
564 | cds_lfht_for_each_entry(regp->channels->ht, &iter.iter, reg_chan, | |
565 | node.node) { | |
566 | ret = lttng_ht_del(regp->channels, &iter); | |
567 | assert(!ret); | |
568 | buffer_reg_channel_destroy(reg_chan, domain); | |
569 | } | |
7972aab2 DG |
570 | rcu_read_unlock(); |
571 | ||
0b2dc8df | 572 | ht_cleanup_push(regp->channels); |
36b588ed | 573 | |
7972aab2 DG |
574 | switch (domain) { |
575 | case LTTNG_DOMAIN_UST: | |
576 | ust_registry_session_destroy(regp->reg.ust); | |
577 | free(regp->reg.ust); | |
578 | break; | |
579 | default: | |
580 | assert(0); | |
581 | } | |
582 | ||
583 | free(regp); | |
584 | return; | |
585 | } | |
586 | ||
587 | /* | |
36b588ed | 588 | * Remove buffer registry UID object from the global hash table. |
7972aab2 DG |
589 | */ |
590 | void buffer_reg_uid_remove(struct buffer_reg_uid *regp) | |
591 | { | |
592 | int ret; | |
593 | struct lttng_ht_iter iter; | |
594 | ||
595 | assert(regp); | |
596 | ||
36b588ed | 597 | rcu_read_lock(); |
7972aab2 DG |
598 | iter.iter.node = ®p->node.node; |
599 | ret = lttng_ht_del(buffer_registry_uid, &iter); | |
600 | assert(!ret); | |
36b588ed | 601 | rcu_read_unlock(); |
7972aab2 DG |
602 | } |
603 | ||
604 | static void rcu_free_buffer_reg_uid(struct rcu_head *head) | |
605 | { | |
606 | struct lttng_ht_node_u64 *node = | |
607 | caa_container_of(head, struct lttng_ht_node_u64, head); | |
608 | struct buffer_reg_uid *reg = | |
609 | caa_container_of(node, struct buffer_reg_uid, node); | |
610 | ||
611 | buffer_reg_session_destroy(reg->registry, reg->domain); | |
612 | free(reg); | |
613 | } | |
614 | ||
615 | static void rcu_free_buffer_reg_pid(struct rcu_head *head) | |
616 | { | |
d9bf3ca4 MD |
617 | struct lttng_ht_node_u64 *node = |
618 | caa_container_of(head, struct lttng_ht_node_u64, head); | |
7972aab2 DG |
619 | struct buffer_reg_pid *reg = |
620 | caa_container_of(node, struct buffer_reg_pid, node); | |
621 | ||
622 | buffer_reg_session_destroy(reg->registry, LTTNG_DOMAIN_UST); | |
623 | free(reg); | |
624 | } | |
625 | ||
626 | /* | |
627 | * Destroy buffer registry per UID. The given pointer is NOT removed from any | |
628 | * list or hash table. Use buffer_reg_pid_remove() before calling this function | |
629 | * for the case that the object is in the global hash table. | |
630 | */ | |
631 | void buffer_reg_uid_destroy(struct buffer_reg_uid *regp, | |
632 | struct consumer_output *consumer) | |
633 | { | |
634 | struct consumer_socket *socket; | |
635 | ||
636 | if (!regp) { | |
637 | return; | |
638 | } | |
639 | ||
d9bf3ca4 | 640 | DBG3("Buffer registry per UID destroy with id: %" PRIu64 ", ABI: %u, uid: %d", |
7972aab2 DG |
641 | regp->session_id, regp->bits_per_long, regp->uid); |
642 | ||
643 | if (!consumer) { | |
644 | goto destroy; | |
645 | } | |
646 | ||
36b588ed | 647 | rcu_read_lock(); |
7972aab2 DG |
648 | /* Get the right socket from the consumer object. */ |
649 | socket = consumer_find_socket_by_bitness(regp->bits_per_long, | |
650 | consumer); | |
651 | if (!socket) { | |
36b588ed | 652 | goto unlock; |
7972aab2 DG |
653 | } |
654 | ||
655 | switch (regp->domain) { | |
656 | case LTTNG_DOMAIN_UST: | |
657 | if (regp->registry->reg.ust->metadata_key) { | |
658 | /* Return value does not matter. This call will print errors. */ | |
659 | (void) consumer_close_metadata(socket, | |
660 | regp->registry->reg.ust->metadata_key); | |
661 | } | |
662 | break; | |
663 | default: | |
664 | assert(0); | |
36b588ed | 665 | rcu_read_unlock(); |
7972aab2 DG |
666 | return; |
667 | } | |
668 | ||
36b588ed MD |
669 | unlock: |
670 | rcu_read_unlock(); | |
7972aab2 DG |
671 | destroy: |
672 | call_rcu(®p->node.head, rcu_free_buffer_reg_uid); | |
673 | } | |
674 | ||
675 | /* | |
676 | * Remove buffer registry UID object from the global hash table. RCU read side | |
677 | * lock MUST be acquired before calling this. | |
678 | */ | |
679 | void buffer_reg_pid_remove(struct buffer_reg_pid *regp) | |
680 | { | |
681 | int ret; | |
682 | struct lttng_ht_iter iter; | |
683 | ||
684 | assert(regp); | |
685 | ||
686 | iter.iter.node = ®p->node.node; | |
687 | ret = lttng_ht_del(buffer_registry_pid, &iter); | |
688 | assert(!ret); | |
689 | } | |
690 | ||
691 | /* | |
692 | * Destroy buffer registry per PID. The pointer is NOT removed from the global | |
693 | * hash table. Call buffer_reg_pid_remove() before that if the object was | |
694 | * previously added to the global hash table. | |
695 | */ | |
696 | void buffer_reg_pid_destroy(struct buffer_reg_pid *regp) | |
697 | { | |
698 | if (!regp) { | |
699 | return; | |
700 | } | |
701 | ||
d9bf3ca4 MD |
702 | DBG3("Buffer registry per PID destroy with id: %" PRIu64, |
703 | regp->session_id); | |
7972aab2 DG |
704 | |
705 | /* This registry is only used by UST. */ | |
706 | call_rcu(®p->node.head, rcu_free_buffer_reg_pid); | |
707 | } | |
708 | ||
709 | /* | |
710 | * Destroy per PID and UID registry hash table. | |
36b588ed MD |
711 | * |
712 | * Should *NOT* be called with RCU read-side lock held. | |
7972aab2 DG |
713 | */ |
714 | void buffer_reg_destroy_registries(void) | |
715 | { | |
716 | DBG3("Buffer registry destroy all registry"); | |
0b2dc8df MD |
717 | ht_cleanup_push(buffer_registry_uid); |
718 | ht_cleanup_push(buffer_registry_pid); | |
7972aab2 | 719 | } |