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 | ||
6c1c0768 | 18 | #define _LGPL_SOURCE |
7972aab2 DG |
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 | */ | |
d9bf3ca4 | 107 | int buffer_reg_uid_create(uint64_t session_id, uint32_t bits_per_long, uid_t uid, |
d7ba1388 | 108 | enum lttng_domain_type domain, struct buffer_reg_uid **regp, |
3d071855 | 109 | const char *root_shm_path, const char *shm_path) |
7972aab2 DG |
110 | { |
111 | int ret = 0; | |
112 | struct buffer_reg_uid *reg = NULL; | |
113 | ||
114 | assert(regp); | |
115 | ||
116 | reg = zmalloc(sizeof(*reg)); | |
117 | if (!reg) { | |
118 | PERROR("zmalloc buffer registry uid"); | |
119 | ret = -ENOMEM; | |
120 | goto error; | |
121 | } | |
122 | ||
123 | reg->registry = zmalloc(sizeof(struct buffer_reg_session)); | |
63c861bd | 124 | if (!reg->registry) { |
7972aab2 DG |
125 | PERROR("zmalloc buffer registry uid session"); |
126 | ret = -ENOMEM; | |
127 | goto error; | |
128 | } | |
129 | ||
130 | reg->session_id = session_id; | |
131 | reg->bits_per_long = bits_per_long; | |
132 | reg->uid = uid; | |
133 | reg->domain = domain; | |
d7ba1388 | 134 | if (shm_path[0]) { |
3d071855 MD |
135 | strncpy(reg->root_shm_path, root_shm_path, sizeof(reg->root_shm_path)); |
136 | reg->root_shm_path[sizeof(reg->root_shm_path) - 1] = '\0'; | |
d7ba1388 MD |
137 | strncpy(reg->shm_path, shm_path, sizeof(reg->shm_path)); |
138 | reg->shm_path[sizeof(reg->shm_path) - 1] = '\0'; | |
139 | DBG3("shm path '%s' is assigned to uid buffer registry for session id %" PRIu64, | |
140 | reg->shm_path, session_id); | |
141 | } | |
7972aab2 DG |
142 | reg->registry->channels = lttng_ht_new(0, LTTNG_HT_TYPE_U64); |
143 | if (!reg->registry->channels) { | |
144 | ret = -ENOMEM; | |
145 | goto error_session; | |
146 | } | |
147 | ||
148 | cds_lfht_node_init(®->node.node); | |
149 | *regp = reg; | |
150 | ||
d9bf3ca4 | 151 | DBG3("Buffer registry per UID created id: %" PRIu64 ", ABI: %u, uid: %d, domain: %d", |
7972aab2 DG |
152 | session_id, bits_per_long, uid, domain); |
153 | ||
154 | return 0; | |
155 | ||
156 | error_session: | |
157 | free(reg->registry); | |
158 | error: | |
159 | free(reg); | |
160 | return ret; | |
161 | } | |
162 | ||
163 | /* | |
164 | * Add a buffer registry per UID object to the global registry. | |
165 | */ | |
166 | void buffer_reg_uid_add(struct buffer_reg_uid *reg) | |
167 | { | |
168 | struct cds_lfht_node *nodep; | |
169 | struct lttng_ht *ht = buffer_registry_uid; | |
170 | ||
171 | assert(reg); | |
172 | ||
d9bf3ca4 | 173 | DBG3("Buffer registry per UID adding to global registry with id: %" PRIu64 , |
7972aab2 DG |
174 | reg->session_id); |
175 | ||
176 | rcu_read_lock(); | |
177 | nodep = cds_lfht_add_unique(ht->ht, ht->hash_fct(reg, lttng_ht_seed), | |
178 | ht->match_fct, reg, ®->node.node); | |
179 | assert(nodep == ®->node.node); | |
180 | rcu_read_unlock(); | |
181 | } | |
182 | ||
183 | /* | |
184 | * Find a buffer registry per UID object with given params. RCU read side lock | |
185 | * MUST be acquired before calling this and hold on to protect the object. | |
186 | * | |
187 | * Return the object pointer or NULL on error. | |
188 | */ | |
d9bf3ca4 | 189 | struct buffer_reg_uid *buffer_reg_uid_find(uint64_t session_id, |
7972aab2 DG |
190 | uint32_t bits_per_long, uid_t uid) |
191 | { | |
192 | struct lttng_ht_node_u64 *node; | |
193 | struct lttng_ht_iter iter; | |
194 | struct buffer_reg_uid *reg = NULL, key; | |
195 | struct lttng_ht *ht = buffer_registry_uid; | |
196 | ||
197 | /* Setup key we are looking for. */ | |
198 | key.session_id = session_id; | |
199 | key.bits_per_long = bits_per_long; | |
200 | key.uid = uid; | |
201 | ||
d9bf3ca4 | 202 | DBG3("Buffer registry per UID find id: %" PRIu64 ", ABI: %u, uid: %d", |
7972aab2 DG |
203 | session_id, bits_per_long, uid); |
204 | ||
205 | /* Custom lookup function since it's a different key. */ | |
206 | cds_lfht_lookup(ht->ht, ht->hash_fct(&key, lttng_ht_seed), ht->match_fct, | |
207 | &key, &iter.iter); | |
208 | node = lttng_ht_iter_get_node_u64(&iter); | |
209 | if (!node) { | |
210 | goto end; | |
211 | } | |
212 | reg = caa_container_of(node, struct buffer_reg_uid, node); | |
213 | ||
214 | end: | |
215 | return reg; | |
216 | } | |
217 | ||
218 | /* | |
219 | * Initialize global buffer per PID registry. Should only be called ONCE!. | |
220 | */ | |
221 | void buffer_reg_init_pid_registry(void) | |
222 | { | |
223 | /* Should be called once. */ | |
224 | assert(!buffer_registry_pid); | |
d9bf3ca4 | 225 | buffer_registry_pid = lttng_ht_new(0, LTTNG_HT_TYPE_U64); |
7972aab2 DG |
226 | assert(buffer_registry_pid); |
227 | ||
228 | DBG3("Global buffer per PID registry initialized"); | |
229 | } | |
230 | ||
231 | /* | |
232 | * Allocate and initialize object. Set regp with the object pointer. | |
233 | * | |
234 | * Return 0 on success else a negative value and regp is untouched. | |
235 | */ | |
d7ba1388 | 236 | int buffer_reg_pid_create(uint64_t session_id, struct buffer_reg_pid **regp, |
3d071855 | 237 | const char *root_shm_path, const char *shm_path) |
7972aab2 DG |
238 | { |
239 | int ret = 0; | |
240 | struct buffer_reg_pid *reg = NULL; | |
241 | ||
242 | assert(regp); | |
243 | ||
244 | reg = zmalloc(sizeof(*reg)); | |
245 | if (!reg) { | |
246 | PERROR("zmalloc buffer registry pid"); | |
247 | ret = -ENOMEM; | |
248 | goto error; | |
249 | } | |
250 | ||
251 | reg->registry = zmalloc(sizeof(struct buffer_reg_session)); | |
63c861bd | 252 | if (!reg->registry) { |
7972aab2 DG |
253 | PERROR("zmalloc buffer registry pid session"); |
254 | ret = -ENOMEM; | |
255 | goto error; | |
256 | } | |
257 | ||
258 | /* A cast is done here so we can use the session ID as a u64 ht node. */ | |
259 | reg->session_id = session_id; | |
d7ba1388 | 260 | if (shm_path[0]) { |
3d071855 MD |
261 | strncpy(reg->root_shm_path, root_shm_path, sizeof(reg->root_shm_path)); |
262 | reg->root_shm_path[sizeof(reg->root_shm_path) - 1] = '\0'; | |
d7ba1388 MD |
263 | strncpy(reg->shm_path, shm_path, sizeof(reg->shm_path)); |
264 | reg->shm_path[sizeof(reg->shm_path) - 1] = '\0'; | |
265 | DBG3("shm path '%s' is assigned to pid buffer registry for session id %" PRIu64, | |
266 | reg->shm_path, session_id); | |
267 | } | |
7972aab2 DG |
268 | reg->registry->channels = lttng_ht_new(0, LTTNG_HT_TYPE_U64); |
269 | if (!reg->registry->channels) { | |
270 | ret = -ENOMEM; | |
271 | goto error_session; | |
272 | } | |
273 | ||
d9bf3ca4 | 274 | lttng_ht_node_init_u64(®->node, reg->session_id); |
7972aab2 DG |
275 | *regp = reg; |
276 | ||
d9bf3ca4 MD |
277 | DBG3("Buffer registry per PID created with session id: %" PRIu64, |
278 | session_id); | |
7972aab2 DG |
279 | |
280 | return 0; | |
281 | ||
282 | error_session: | |
283 | free(reg->registry); | |
284 | error: | |
285 | free(reg); | |
286 | return ret; | |
287 | } | |
288 | ||
289 | /* | |
290 | * Add a buffer registry per PID object to the global registry. | |
291 | */ | |
292 | void buffer_reg_pid_add(struct buffer_reg_pid *reg) | |
293 | { | |
294 | assert(reg); | |
295 | ||
d9bf3ca4 | 296 | DBG3("Buffer registry per PID adding to global registry with id: %" PRIu64, |
7972aab2 DG |
297 | reg->session_id); |
298 | ||
299 | rcu_read_lock(); | |
d9bf3ca4 | 300 | lttng_ht_add_unique_u64(buffer_registry_pid, ®->node); |
7972aab2 DG |
301 | rcu_read_unlock(); |
302 | } | |
303 | ||
304 | /* | |
305 | * Find a buffer registry per PID object with given params. RCU read side lock | |
306 | * MUST be acquired before calling this and hold on to protect the object. | |
307 | * | |
308 | * Return the object pointer or NULL on error. | |
309 | */ | |
d9bf3ca4 | 310 | struct buffer_reg_pid *buffer_reg_pid_find(uint64_t session_id) |
7972aab2 | 311 | { |
d9bf3ca4 | 312 | struct lttng_ht_node_u64 *node; |
7972aab2 DG |
313 | struct lttng_ht_iter iter; |
314 | struct buffer_reg_pid *reg = NULL; | |
315 | struct lttng_ht *ht = buffer_registry_pid; | |
316 | ||
d9bf3ca4 | 317 | DBG3("Buffer registry per PID find id: %" PRIu64, session_id); |
7972aab2 | 318 | |
d9bf3ca4 MD |
319 | lttng_ht_lookup(ht, &session_id, &iter); |
320 | node = lttng_ht_iter_get_node_u64(&iter); | |
7972aab2 DG |
321 | if (!node) { |
322 | goto end; | |
323 | } | |
324 | reg = caa_container_of(node, struct buffer_reg_pid, node); | |
325 | ||
326 | end: | |
327 | return reg; | |
328 | } | |
329 | ||
fb83fe64 JD |
330 | /* |
331 | * Find the consumer channel key from a UST session per-uid channel key. | |
332 | * | |
333 | * Return the matching key or -1 if not found. | |
334 | */ | |
335 | int buffer_reg_uid_consumer_channel_key( | |
336 | struct cds_list_head *buffer_reg_uid_list, | |
337 | uint64_t usess_id, uint64_t chan_key, | |
338 | uint64_t *consumer_chan_key) | |
339 | { | |
340 | struct lttng_ht_iter iter; | |
341 | struct buffer_reg_uid *uid_reg = NULL; | |
342 | struct buffer_reg_session *session_reg = NULL; | |
343 | struct buffer_reg_channel *reg_chan; | |
344 | int ret = -1; | |
345 | ||
346 | rcu_read_lock(); | |
347 | /* | |
348 | * For the per-uid registry, we have to iterate since we don't have the | |
349 | * uid and bitness key. | |
350 | */ | |
351 | cds_list_for_each_entry(uid_reg, buffer_reg_uid_list, lnode) { | |
352 | session_reg = uid_reg->registry; | |
353 | cds_lfht_for_each_entry(session_reg->channels->ht, | |
354 | &iter.iter, reg_chan, node.node) { | |
355 | if (reg_chan->key == chan_key) { | |
356 | *consumer_chan_key = reg_chan->consumer_key; | |
357 | ret = 0; | |
358 | goto end; | |
359 | } | |
360 | } | |
361 | } | |
362 | ||
363 | end: | |
364 | rcu_read_unlock(); | |
365 | return ret; | |
366 | } | |
367 | ||
7972aab2 DG |
368 | /* |
369 | * Allocate and initialize a buffer registry channel with the given key. Set | |
370 | * regp with the object pointer. | |
371 | * | |
372 | * Return 0 on success or else a negative value keeping regp untouched. | |
373 | */ | |
374 | int buffer_reg_channel_create(uint64_t key, struct buffer_reg_channel **regp) | |
375 | { | |
376 | struct buffer_reg_channel *reg; | |
377 | ||
378 | assert(regp); | |
379 | ||
380 | DBG3("Buffer registry channel create with key: %" PRIu64, key); | |
381 | ||
382 | reg = zmalloc(sizeof(*reg)); | |
383 | if (!reg) { | |
384 | PERROR("zmalloc buffer registry channel"); | |
385 | return -ENOMEM; | |
386 | } | |
387 | ||
388 | reg->key = key; | |
389 | CDS_INIT_LIST_HEAD(®->streams); | |
390 | pthread_mutex_init(®->stream_list_lock, NULL); | |
391 | ||
392 | lttng_ht_node_init_u64(®->node, key); | |
393 | *regp = reg; | |
394 | ||
395 | return 0; | |
396 | } | |
397 | ||
398 | /* | |
399 | * Allocate and initialize a buffer registry stream. Set regp with the object | |
400 | * pointer. | |
401 | * | |
402 | * Return 0 on success or else a negative value keeping regp untouched. | |
403 | */ | |
404 | int buffer_reg_stream_create(struct buffer_reg_stream **regp) | |
405 | { | |
406 | struct buffer_reg_stream *reg; | |
407 | ||
408 | assert(regp); | |
409 | ||
410 | DBG3("Buffer registry creating stream"); | |
411 | ||
412 | reg = zmalloc(sizeof(*reg)); | |
413 | if (!reg) { | |
414 | PERROR("zmalloc buffer registry stream"); | |
415 | return -ENOMEM; | |
416 | } | |
417 | ||
418 | *regp = reg; | |
419 | ||
420 | return 0; | |
421 | } | |
422 | ||
423 | /* | |
424 | * Add stream to the list in the channel. | |
425 | */ | |
426 | void buffer_reg_stream_add(struct buffer_reg_stream *stream, | |
427 | struct buffer_reg_channel *channel) | |
428 | { | |
429 | assert(stream); | |
430 | assert(channel); | |
431 | ||
432 | pthread_mutex_lock(&channel->stream_list_lock); | |
433 | cds_list_add_tail(&stream->lnode, &channel->streams); | |
5c786ded | 434 | channel->stream_count++; |
7972aab2 DG |
435 | pthread_mutex_unlock(&channel->stream_list_lock); |
436 | } | |
437 | ||
438 | /* | |
439 | * Add a buffer registry channel object to the given session. | |
440 | */ | |
441 | void buffer_reg_channel_add(struct buffer_reg_session *session, | |
442 | struct buffer_reg_channel *channel) | |
443 | { | |
444 | assert(session); | |
445 | assert(channel); | |
446 | ||
447 | rcu_read_lock(); | |
448 | lttng_ht_add_unique_u64(session->channels, &channel->node); | |
449 | rcu_read_unlock(); | |
450 | } | |
451 | ||
452 | /* | |
453 | * Find a buffer registry channel object with the given key. RCU read side lock | |
454 | * MUST be acquired and hold on until the object reference is not needed | |
455 | * anymore. | |
456 | * | |
457 | * Return the object pointer or NULL on error. | |
458 | */ | |
459 | struct buffer_reg_channel *buffer_reg_channel_find(uint64_t key, | |
460 | struct buffer_reg_uid *reg) | |
461 | { | |
462 | struct lttng_ht_node_u64 *node; | |
463 | struct lttng_ht_iter iter; | |
464 | struct buffer_reg_channel *chan = NULL; | |
465 | struct lttng_ht *ht; | |
466 | ||
467 | assert(reg); | |
468 | ||
469 | switch (reg->domain) { | |
470 | case LTTNG_DOMAIN_UST: | |
471 | ht = reg->registry->channels; | |
472 | break; | |
473 | default: | |
474 | assert(0); | |
475 | goto end; | |
476 | } | |
477 | ||
478 | lttng_ht_lookup(ht, &key, &iter); | |
479 | node = lttng_ht_iter_get_node_u64(&iter); | |
480 | if (!node) { | |
481 | goto end; | |
482 | } | |
483 | chan = caa_container_of(node, struct buffer_reg_channel, node); | |
484 | ||
485 | end: | |
486 | return chan; | |
487 | } | |
488 | ||
489 | /* | |
490 | * Destroy a buffer registry stream with the given domain. | |
491 | */ | |
492 | void buffer_reg_stream_destroy(struct buffer_reg_stream *regp, | |
493 | enum lttng_domain_type domain) | |
494 | { | |
495 | if (!regp) { | |
496 | return; | |
497 | } | |
498 | ||
499 | DBG3("Buffer registry stream destroy with handle %d", | |
500 | regp->obj.ust->handle); | |
501 | ||
502 | switch (domain) { | |
503 | case LTTNG_DOMAIN_UST: | |
504 | { | |
505 | int ret; | |
506 | ||
fb45065e | 507 | ret = ust_app_release_object(NULL, regp->obj.ust); |
7972aab2 DG |
508 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
509 | ERR("Buffer reg stream release obj handle %d failed with ret %d", | |
510 | regp->obj.ust->handle, ret); | |
511 | } | |
512 | free(regp->obj.ust); | |
513 | lttng_fd_put(LTTNG_FD_APPS, 2); | |
514 | break; | |
515 | } | |
516 | default: | |
517 | assert(0); | |
518 | } | |
519 | ||
520 | free(regp); | |
521 | return; | |
522 | } | |
523 | ||
524 | /* | |
525 | * Remove buffer registry channel object from the session hash table. RCU read | |
526 | * side lock MUST be acquired before calling this. | |
527 | */ | |
528 | void buffer_reg_channel_remove(struct buffer_reg_session *session, | |
529 | struct buffer_reg_channel *regp) | |
530 | { | |
531 | int ret; | |
532 | struct lttng_ht_iter iter; | |
533 | ||
534 | assert(session); | |
535 | assert(regp); | |
536 | ||
537 | iter.iter.node = ®p->node.node; | |
538 | ret = lttng_ht_del(session->channels, &iter); | |
539 | assert(!ret); | |
540 | } | |
541 | ||
542 | /* | |
543 | * Destroy a buffer registry channel with the given domain. | |
544 | */ | |
545 | void buffer_reg_channel_destroy(struct buffer_reg_channel *regp, | |
546 | enum lttng_domain_type domain) | |
547 | { | |
548 | if (!regp) { | |
549 | return; | |
550 | } | |
551 | ||
07d2ae95 | 552 | DBG3("Buffer registry channel destroy with key %" PRIu32, regp->key); |
7972aab2 DG |
553 | |
554 | switch (domain) { | |
555 | case LTTNG_DOMAIN_UST: | |
556 | { | |
557 | int ret; | |
558 | struct buffer_reg_stream *sreg, *stmp; | |
559 | /* Wipe stream */ | |
560 | cds_list_for_each_entry_safe(sreg, stmp, ®p->streams, lnode) { | |
561 | cds_list_del(&sreg->lnode); | |
5c786ded | 562 | regp->stream_count--; |
7972aab2 DG |
563 | buffer_reg_stream_destroy(sreg, domain); |
564 | } | |
565 | ||
55d7e860 | 566 | if (regp->obj.ust) { |
fb45065e | 567 | ret = ust_app_release_object(NULL, regp->obj.ust); |
55d7e860 MD |
568 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
569 | ERR("Buffer reg channel release obj handle %d failed with ret %d", | |
570 | regp->obj.ust->handle, ret); | |
571 | } | |
572 | free(regp->obj.ust); | |
7972aab2 | 573 | } |
7972aab2 DG |
574 | lttng_fd_put(LTTNG_FD_APPS, 1); |
575 | break; | |
576 | } | |
577 | default: | |
578 | assert(0); | |
579 | } | |
580 | ||
581 | free(regp); | |
582 | return; | |
583 | } | |
584 | ||
585 | /* | |
586 | * Destroy a buffer registry session with the given domain. | |
36b588ed MD |
587 | * |
588 | * Should *NOT* be called with RCU read-side lock held. | |
7972aab2 | 589 | */ |
36b588ed | 590 | static void buffer_reg_session_destroy(struct buffer_reg_session *regp, |
7972aab2 DG |
591 | enum lttng_domain_type domain) |
592 | { | |
593 | int ret; | |
594 | struct lttng_ht_iter iter; | |
595 | struct buffer_reg_channel *reg_chan; | |
596 | ||
597 | DBG3("Buffer registry session destroy"); | |
598 | ||
599 | /* Destroy all channels. */ | |
600 | rcu_read_lock(); | |
601 | cds_lfht_for_each_entry(regp->channels->ht, &iter.iter, reg_chan, | |
602 | node.node) { | |
603 | ret = lttng_ht_del(regp->channels, &iter); | |
604 | assert(!ret); | |
605 | buffer_reg_channel_destroy(reg_chan, domain); | |
606 | } | |
7972aab2 DG |
607 | rcu_read_unlock(); |
608 | ||
0b2dc8df | 609 | ht_cleanup_push(regp->channels); |
36b588ed | 610 | |
7972aab2 DG |
611 | switch (domain) { |
612 | case LTTNG_DOMAIN_UST: | |
613 | ust_registry_session_destroy(regp->reg.ust); | |
614 | free(regp->reg.ust); | |
615 | break; | |
616 | default: | |
617 | assert(0); | |
618 | } | |
619 | ||
620 | free(regp); | |
621 | return; | |
622 | } | |
623 | ||
624 | /* | |
36b588ed | 625 | * Remove buffer registry UID object from the global hash table. |
7972aab2 DG |
626 | */ |
627 | void buffer_reg_uid_remove(struct buffer_reg_uid *regp) | |
628 | { | |
629 | int ret; | |
630 | struct lttng_ht_iter iter; | |
631 | ||
632 | assert(regp); | |
633 | ||
36b588ed | 634 | rcu_read_lock(); |
7972aab2 DG |
635 | iter.iter.node = ®p->node.node; |
636 | ret = lttng_ht_del(buffer_registry_uid, &iter); | |
637 | assert(!ret); | |
36b588ed | 638 | rcu_read_unlock(); |
7972aab2 DG |
639 | } |
640 | ||
641 | static void rcu_free_buffer_reg_uid(struct rcu_head *head) | |
642 | { | |
643 | struct lttng_ht_node_u64 *node = | |
644 | caa_container_of(head, struct lttng_ht_node_u64, head); | |
645 | struct buffer_reg_uid *reg = | |
646 | caa_container_of(node, struct buffer_reg_uid, node); | |
647 | ||
648 | buffer_reg_session_destroy(reg->registry, reg->domain); | |
649 | free(reg); | |
650 | } | |
651 | ||
652 | static void rcu_free_buffer_reg_pid(struct rcu_head *head) | |
653 | { | |
d9bf3ca4 MD |
654 | struct lttng_ht_node_u64 *node = |
655 | caa_container_of(head, struct lttng_ht_node_u64, head); | |
7972aab2 DG |
656 | struct buffer_reg_pid *reg = |
657 | caa_container_of(node, struct buffer_reg_pid, node); | |
658 | ||
659 | buffer_reg_session_destroy(reg->registry, LTTNG_DOMAIN_UST); | |
660 | free(reg); | |
661 | } | |
662 | ||
663 | /* | |
664 | * Destroy buffer registry per UID. The given pointer is NOT removed from any | |
665 | * list or hash table. Use buffer_reg_pid_remove() before calling this function | |
666 | * for the case that the object is in the global hash table. | |
667 | */ | |
668 | void buffer_reg_uid_destroy(struct buffer_reg_uid *regp, | |
669 | struct consumer_output *consumer) | |
670 | { | |
671 | struct consumer_socket *socket; | |
672 | ||
673 | if (!regp) { | |
674 | return; | |
675 | } | |
676 | ||
d9bf3ca4 | 677 | DBG3("Buffer registry per UID destroy with id: %" PRIu64 ", ABI: %u, uid: %d", |
7972aab2 DG |
678 | regp->session_id, regp->bits_per_long, regp->uid); |
679 | ||
680 | if (!consumer) { | |
681 | goto destroy; | |
682 | } | |
683 | ||
36b588ed | 684 | rcu_read_lock(); |
7972aab2 DG |
685 | /* Get the right socket from the consumer object. */ |
686 | socket = consumer_find_socket_by_bitness(regp->bits_per_long, | |
687 | consumer); | |
688 | if (!socket) { | |
36b588ed | 689 | goto unlock; |
7972aab2 DG |
690 | } |
691 | ||
692 | switch (regp->domain) { | |
693 | case LTTNG_DOMAIN_UST: | |
694 | if (regp->registry->reg.ust->metadata_key) { | |
695 | /* Return value does not matter. This call will print errors. */ | |
696 | (void) consumer_close_metadata(socket, | |
697 | regp->registry->reg.ust->metadata_key); | |
698 | } | |
699 | break; | |
700 | default: | |
701 | assert(0); | |
36b588ed | 702 | rcu_read_unlock(); |
7972aab2 DG |
703 | return; |
704 | } | |
705 | ||
36b588ed MD |
706 | unlock: |
707 | rcu_read_unlock(); | |
7972aab2 DG |
708 | destroy: |
709 | call_rcu(®p->node.head, rcu_free_buffer_reg_uid); | |
710 | } | |
711 | ||
712 | /* | |
713 | * Remove buffer registry UID object from the global hash table. RCU read side | |
714 | * lock MUST be acquired before calling this. | |
715 | */ | |
716 | void buffer_reg_pid_remove(struct buffer_reg_pid *regp) | |
717 | { | |
718 | int ret; | |
719 | struct lttng_ht_iter iter; | |
720 | ||
721 | assert(regp); | |
722 | ||
723 | iter.iter.node = ®p->node.node; | |
724 | ret = lttng_ht_del(buffer_registry_pid, &iter); | |
725 | assert(!ret); | |
726 | } | |
727 | ||
728 | /* | |
729 | * Destroy buffer registry per PID. The pointer is NOT removed from the global | |
730 | * hash table. Call buffer_reg_pid_remove() before that if the object was | |
731 | * previously added to the global hash table. | |
732 | */ | |
733 | void buffer_reg_pid_destroy(struct buffer_reg_pid *regp) | |
734 | { | |
735 | if (!regp) { | |
736 | return; | |
737 | } | |
738 | ||
d9bf3ca4 MD |
739 | DBG3("Buffer registry per PID destroy with id: %" PRIu64, |
740 | regp->session_id); | |
7972aab2 DG |
741 | |
742 | /* This registry is only used by UST. */ | |
743 | call_rcu(®p->node.head, rcu_free_buffer_reg_pid); | |
744 | } | |
745 | ||
746 | /* | |
747 | * Destroy per PID and UID registry hash table. | |
36b588ed MD |
748 | * |
749 | * Should *NOT* be called with RCU read-side lock held. | |
7972aab2 DG |
750 | */ |
751 | void buffer_reg_destroy_registries(void) | |
752 | { | |
753 | DBG3("Buffer registry destroy all registry"); | |
0b2dc8df MD |
754 | ht_cleanup_push(buffer_registry_uid); |
755 | ht_cleanup_push(buffer_registry_pid); | |
7972aab2 | 756 | } |