Cleanup: ust_session_id unused by buffer_reg_uid_consumer_channel_key
[lttng-tools.git] / src / bin / lttng-sessiond / buffer-registry.c
CommitLineData
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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
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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"
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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 */
36static 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 */
42static 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 */
48static 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;
68no_match:
69 return 0;
70}
71
72/*
73 * Hash function for the per UID registry hash table. This XOR the triplet
74 * together.
75 */
bcd52dd9 76static unsigned long ht_hash_reg_uid(const void *_key, unsigned long seed)
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77{
78 uint64_t xored_key;
bcd52dd9 79 const struct buffer_reg_uid *key = _key;
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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 */
90void 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 107int 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)
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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) {
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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';
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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 }
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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(&reg->node.node);
149 *regp = reg;
150
d9bf3ca4 151 DBG3("Buffer registry per UID created id: %" PRIu64 ", ABI: %u, uid: %d, domain: %d",
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152 session_id, bits_per_long, uid, domain);
153
154 return 0;
155
156error_session:
157 free(reg->registry);
158error:
159 free(reg);
160 return ret;
161}
162
163/*
164 * Add a buffer registry per UID object to the global registry.
165 */
166void 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 ,
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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, &reg->node.node);
179 assert(nodep == &reg->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 189struct buffer_reg_uid *buffer_reg_uid_find(uint64_t session_id,
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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",
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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
214end:
215 return reg;
216}
217
218/*
219 * Initialize global buffer per PID registry. Should only be called ONCE!.
220 */
221void 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);
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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 236int buffer_reg_pid_create(uint64_t session_id, struct buffer_reg_pid **regp,
3d071855 237 const char *root_shm_path, const char *shm_path)
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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) {
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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
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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
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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 }
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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(&reg->node, reg->session_id);
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275 *regp = reg;
276
d9bf3ca4
MD
277 DBG3("Buffer registry per PID created with session id: %" PRIu64,
278 session_id);
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279
280 return 0;
281
282error_session:
283 free(reg->registry);
284error:
285 free(reg);
286 return ret;
287}
288
289/*
290 * Add a buffer registry per PID object to the global registry.
291 */
292void 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,
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297 reg->session_id);
298
299 rcu_read_lock();
d9bf3ca4 300 lttng_ht_add_unique_u64(buffer_registry_pid, &reg->node);
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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 310struct buffer_reg_pid *buffer_reg_pid_find(uint64_t session_id)
7972aab2 311{
d9bf3ca4 312 struct lttng_ht_node_u64 *node;
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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);
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321 if (!node) {
322 goto end;
323 }
324 reg = caa_container_of(node, struct buffer_reg_pid, node);
325
326end:
327 return reg;
328}
329
fb83fe64
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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 */
335int buffer_reg_uid_consumer_channel_key(
336 struct cds_list_head *buffer_reg_uid_list,
76604852 337 uint64_t chan_key, uint64_t *consumer_chan_key)
fb83fe64
JD
338{
339 struct lttng_ht_iter iter;
340 struct buffer_reg_uid *uid_reg = NULL;
341 struct buffer_reg_session *session_reg = NULL;
342 struct buffer_reg_channel *reg_chan;
343 int ret = -1;
344
345 rcu_read_lock();
346 /*
347 * For the per-uid registry, we have to iterate since we don't have the
348 * uid and bitness key.
349 */
350 cds_list_for_each_entry(uid_reg, buffer_reg_uid_list, lnode) {
351 session_reg = uid_reg->registry;
352 cds_lfht_for_each_entry(session_reg->channels->ht,
353 &iter.iter, reg_chan, node.node) {
354 if (reg_chan->key == chan_key) {
355 *consumer_chan_key = reg_chan->consumer_key;
356 ret = 0;
357 goto end;
358 }
359 }
360 }
361
362end:
363 rcu_read_unlock();
364 return ret;
365}
366
7972aab2
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367/*
368 * Allocate and initialize a buffer registry channel with the given key. Set
369 * regp with the object pointer.
370 *
371 * Return 0 on success or else a negative value keeping regp untouched.
372 */
373int buffer_reg_channel_create(uint64_t key, struct buffer_reg_channel **regp)
374{
375 struct buffer_reg_channel *reg;
376
377 assert(regp);
378
379 DBG3("Buffer registry channel create with key: %" PRIu64, key);
380
381 reg = zmalloc(sizeof(*reg));
382 if (!reg) {
383 PERROR("zmalloc buffer registry channel");
384 return -ENOMEM;
385 }
386
387 reg->key = key;
388 CDS_INIT_LIST_HEAD(&reg->streams);
389 pthread_mutex_init(&reg->stream_list_lock, NULL);
390
391 lttng_ht_node_init_u64(&reg->node, key);
392 *regp = reg;
393
394 return 0;
395}
396
397/*
398 * Allocate and initialize a buffer registry stream. Set regp with the object
399 * pointer.
400 *
401 * Return 0 on success or else a negative value keeping regp untouched.
402 */
403int buffer_reg_stream_create(struct buffer_reg_stream **regp)
404{
405 struct buffer_reg_stream *reg;
406
407 assert(regp);
408
409 DBG3("Buffer registry creating stream");
410
411 reg = zmalloc(sizeof(*reg));
412 if (!reg) {
413 PERROR("zmalloc buffer registry stream");
414 return -ENOMEM;
415 }
416
417 *regp = reg;
418
419 return 0;
420}
421
422/*
423 * Add stream to the list in the channel.
424 */
425void buffer_reg_stream_add(struct buffer_reg_stream *stream,
426 struct buffer_reg_channel *channel)
427{
428 assert(stream);
429 assert(channel);
430
431 pthread_mutex_lock(&channel->stream_list_lock);
432 cds_list_add_tail(&stream->lnode, &channel->streams);
5c786ded 433 channel->stream_count++;
7972aab2
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434 pthread_mutex_unlock(&channel->stream_list_lock);
435}
436
437/*
438 * Add a buffer registry channel object to the given session.
439 */
440void buffer_reg_channel_add(struct buffer_reg_session *session,
441 struct buffer_reg_channel *channel)
442{
443 assert(session);
444 assert(channel);
445
446 rcu_read_lock();
447 lttng_ht_add_unique_u64(session->channels, &channel->node);
448 rcu_read_unlock();
449}
450
451/*
452 * Find a buffer registry channel object with the given key. RCU read side lock
453 * MUST be acquired and hold on until the object reference is not needed
454 * anymore.
455 *
456 * Return the object pointer or NULL on error.
457 */
458struct buffer_reg_channel *buffer_reg_channel_find(uint64_t key,
459 struct buffer_reg_uid *reg)
460{
461 struct lttng_ht_node_u64 *node;
462 struct lttng_ht_iter iter;
463 struct buffer_reg_channel *chan = NULL;
464 struct lttng_ht *ht;
465
466 assert(reg);
467
468 switch (reg->domain) {
469 case LTTNG_DOMAIN_UST:
470 ht = reg->registry->channels;
471 break;
472 default:
473 assert(0);
474 goto end;
475 }
476
477 lttng_ht_lookup(ht, &key, &iter);
478 node = lttng_ht_iter_get_node_u64(&iter);
479 if (!node) {
480 goto end;
481 }
482 chan = caa_container_of(node, struct buffer_reg_channel, node);
483
484end:
485 return chan;
486}
487
488/*
489 * Destroy a buffer registry stream with the given domain.
490 */
491void buffer_reg_stream_destroy(struct buffer_reg_stream *regp,
492 enum lttng_domain_type domain)
493{
494 if (!regp) {
495 return;
496 }
497
498 DBG3("Buffer registry stream destroy with handle %d",
499 regp->obj.ust->handle);
500
501 switch (domain) {
502 case LTTNG_DOMAIN_UST:
503 {
504 int ret;
505
fb45065e 506 ret = ust_app_release_object(NULL, regp->obj.ust);
7972aab2
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507 if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
508 ERR("Buffer reg stream release obj handle %d failed with ret %d",
509 regp->obj.ust->handle, ret);
510 }
511 free(regp->obj.ust);
512 lttng_fd_put(LTTNG_FD_APPS, 2);
513 break;
514 }
515 default:
516 assert(0);
517 }
518
519 free(regp);
520 return;
521}
522
523/*
524 * Remove buffer registry channel object from the session hash table. RCU read
525 * side lock MUST be acquired before calling this.
526 */
527void buffer_reg_channel_remove(struct buffer_reg_session *session,
528 struct buffer_reg_channel *regp)
529{
530 int ret;
531 struct lttng_ht_iter iter;
532
533 assert(session);
534 assert(regp);
535
536 iter.iter.node = &regp->node.node;
537 ret = lttng_ht_del(session->channels, &iter);
538 assert(!ret);
539}
540
541/*
542 * Destroy a buffer registry channel with the given domain.
543 */
544void buffer_reg_channel_destroy(struct buffer_reg_channel *regp,
545 enum lttng_domain_type domain)
546{
547 if (!regp) {
548 return;
549 }
550
07d2ae95 551 DBG3("Buffer registry channel destroy with key %" PRIu32, regp->key);
7972aab2
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552
553 switch (domain) {
554 case LTTNG_DOMAIN_UST:
555 {
556 int ret;
557 struct buffer_reg_stream *sreg, *stmp;
558 /* Wipe stream */
559 cds_list_for_each_entry_safe(sreg, stmp, &regp->streams, lnode) {
560 cds_list_del(&sreg->lnode);
5c786ded 561 regp->stream_count--;
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562 buffer_reg_stream_destroy(sreg, domain);
563 }
564
55d7e860 565 if (regp->obj.ust) {
fb45065e 566 ret = ust_app_release_object(NULL, regp->obj.ust);
55d7e860
MD
567 if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
568 ERR("Buffer reg channel release obj handle %d failed with ret %d",
569 regp->obj.ust->handle, ret);
570 }
571 free(regp->obj.ust);
7972aab2 572 }
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573 lttng_fd_put(LTTNG_FD_APPS, 1);
574 break;
575 }
576 default:
577 assert(0);
578 }
579
580 free(regp);
581 return;
582}
583
584/*
585 * Destroy a buffer registry session with the given domain.
36b588ed
MD
586 *
587 * Should *NOT* be called with RCU read-side lock held.
7972aab2 588 */
36b588ed 589static void buffer_reg_session_destroy(struct buffer_reg_session *regp,
7972aab2
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590 enum lttng_domain_type domain)
591{
592 int ret;
593 struct lttng_ht_iter iter;
594 struct buffer_reg_channel *reg_chan;
595
596 DBG3("Buffer registry session destroy");
597
598 /* Destroy all channels. */
599 rcu_read_lock();
600 cds_lfht_for_each_entry(regp->channels->ht, &iter.iter, reg_chan,
601 node.node) {
602 ret = lttng_ht_del(regp->channels, &iter);
603 assert(!ret);
604 buffer_reg_channel_destroy(reg_chan, domain);
605 }
7972aab2
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606 rcu_read_unlock();
607
0b2dc8df 608 ht_cleanup_push(regp->channels);
36b588ed 609
7972aab2
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610 switch (domain) {
611 case LTTNG_DOMAIN_UST:
612 ust_registry_session_destroy(regp->reg.ust);
613 free(regp->reg.ust);
614 break;
615 default:
616 assert(0);
617 }
618
619 free(regp);
620 return;
621}
622
623/*
36b588ed 624 * Remove buffer registry UID object from the global hash table.
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625 */
626void buffer_reg_uid_remove(struct buffer_reg_uid *regp)
627{
628 int ret;
629 struct lttng_ht_iter iter;
630
631 assert(regp);
632
36b588ed 633 rcu_read_lock();
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634 iter.iter.node = &regp->node.node;
635 ret = lttng_ht_del(buffer_registry_uid, &iter);
636 assert(!ret);
36b588ed 637 rcu_read_unlock();
7972aab2
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638}
639
640static void rcu_free_buffer_reg_uid(struct rcu_head *head)
641{
642 struct lttng_ht_node_u64 *node =
643 caa_container_of(head, struct lttng_ht_node_u64, head);
644 struct buffer_reg_uid *reg =
645 caa_container_of(node, struct buffer_reg_uid, node);
646
647 buffer_reg_session_destroy(reg->registry, reg->domain);
648 free(reg);
649}
650
651static void rcu_free_buffer_reg_pid(struct rcu_head *head)
652{
d9bf3ca4
MD
653 struct lttng_ht_node_u64 *node =
654 caa_container_of(head, struct lttng_ht_node_u64, head);
7972aab2
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655 struct buffer_reg_pid *reg =
656 caa_container_of(node, struct buffer_reg_pid, node);
657
658 buffer_reg_session_destroy(reg->registry, LTTNG_DOMAIN_UST);
659 free(reg);
660}
661
662/*
663 * Destroy buffer registry per UID. The given pointer is NOT removed from any
664 * list or hash table. Use buffer_reg_pid_remove() before calling this function
665 * for the case that the object is in the global hash table.
666 */
667void buffer_reg_uid_destroy(struct buffer_reg_uid *regp,
668 struct consumer_output *consumer)
669{
670 struct consumer_socket *socket;
671
672 if (!regp) {
673 return;
674 }
675
d9bf3ca4 676 DBG3("Buffer registry per UID destroy with id: %" PRIu64 ", ABI: %u, uid: %d",
7972aab2
DG
677 regp->session_id, regp->bits_per_long, regp->uid);
678
679 if (!consumer) {
680 goto destroy;
681 }
682
36b588ed 683 rcu_read_lock();
7972aab2
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684 /* Get the right socket from the consumer object. */
685 socket = consumer_find_socket_by_bitness(regp->bits_per_long,
686 consumer);
687 if (!socket) {
36b588ed 688 goto unlock;
7972aab2
DG
689 }
690
691 switch (regp->domain) {
692 case LTTNG_DOMAIN_UST:
693 if (regp->registry->reg.ust->metadata_key) {
694 /* Return value does not matter. This call will print errors. */
695 (void) consumer_close_metadata(socket,
696 regp->registry->reg.ust->metadata_key);
697 }
698 break;
699 default:
700 assert(0);
36b588ed 701 rcu_read_unlock();
7972aab2
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702 return;
703 }
704
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705unlock:
706 rcu_read_unlock();
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707destroy:
708 call_rcu(&regp->node.head, rcu_free_buffer_reg_uid);
709}
710
711/*
712 * Remove buffer registry UID object from the global hash table. RCU read side
713 * lock MUST be acquired before calling this.
714 */
715void buffer_reg_pid_remove(struct buffer_reg_pid *regp)
716{
717 int ret;
718 struct lttng_ht_iter iter;
719
720 assert(regp);
721
722 iter.iter.node = &regp->node.node;
723 ret = lttng_ht_del(buffer_registry_pid, &iter);
724 assert(!ret);
725}
726
727/*
728 * Destroy buffer registry per PID. The pointer is NOT removed from the global
729 * hash table. Call buffer_reg_pid_remove() before that if the object was
730 * previously added to the global hash table.
731 */
732void buffer_reg_pid_destroy(struct buffer_reg_pid *regp)
733{
734 if (!regp) {
735 return;
736 }
737
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738 DBG3("Buffer registry per PID destroy with id: %" PRIu64,
739 regp->session_id);
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740
741 /* This registry is only used by UST. */
742 call_rcu(&regp->node.head, rcu_free_buffer_reg_pid);
743}
744
745/*
746 * Destroy per PID and UID registry hash table.
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747 *
748 * Should *NOT* be called with RCU read-side lock held.
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749 */
750void buffer_reg_destroy_registries(void)
751{
752 DBG3("Buffer registry destroy all registry");
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753 ht_cleanup_push(buffer_registry_uid);
754 ht_cleanup_push(buffer_registry_pid);
7972aab2 755}
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