1
2 /*
3 * Copyright (C) Igor Sysoev
4 */
5
6
7 #include <ngx_config.h>
8 #include <ngx_core.h>
9 #include <ngx_event.h>
10
11
12 /*
13 * open file cache caches
14 * open file handles with stat() info;
15 * directories stat() info;
16 * files and directories errors: not found, access denied, etc.
17 */
18
19
20 #define NGX_MIN_READ_AHEAD (128 * 1024)
21
22
23 static void ngx_open_file_cache_cleanup(void *data);
24 static ngx_int_t ngx_open_and_stat_file(u_char *name, ngx_open_file_info_t *of,
25 ngx_log_t *log);
26 static void ngx_open_file_add_event(ngx_open_file_cache_t *cache,
27 ngx_cached_open_file_t *file, ngx_open_file_info_t *of, ngx_log_t *log);
28 static void ngx_open_file_cleanup(void *data);
29 static void ngx_close_cached_file(ngx_open_file_cache_t *cache,
30 ngx_cached_open_file_t *file, ngx_uint_t min_uses, ngx_log_t *log);
31 static void ngx_open_file_del_event(ngx_cached_open_file_t *file);
32 static void ngx_expire_old_cached_files(ngx_open_file_cache_t *cache,
33 ngx_uint_t n, ngx_log_t *log);
34 static void ngx_open_file_cache_rbtree_insert_value(ngx_rbtree_node_t *temp,
35 ngx_rbtree_node_t *node, ngx_rbtree_node_t *sentinel);
36 static ngx_cached_open_file_t *
37 ngx_open_file_lookup(ngx_open_file_cache_t *cache, ngx_str_t *name,
38 uint32_t hash);
39 static void ngx_open_file_cache_remove(ngx_event_t *ev);
40
41
42 ngx_open_file_cache_t *
43 ngx_open_file_cache_init(ngx_pool_t *pool, ngx_uint_t max, time_t inactive)
44 {
45 ngx_pool_cleanup_t *cln;
46 ngx_open_file_cache_t *cache;
47
48 cache = ngx_palloc(pool, sizeof(ngx_open_file_cache_t));
49 if (cache == NULL) {
50 return NULL;
51 }
52
53 ngx_rbtree_init(&cache->rbtree, &cache->sentinel,
54 ngx_open_file_cache_rbtree_insert_value);
55
56 ngx_queue_init(&cache->expire_queue);
57
58 cache->current = 0;
59 cache->max = max;
60 cache->inactive = inactive;
61
62 cln = ngx_pool_cleanup_add(pool, 0);
63 if (cln == NULL) {
64 return NULL;
65 }
66
67 cln->handler = ngx_open_file_cache_cleanup;
68 cln->data = cache;
69
70 return cache;
71 }
72
73
74 static void
75 ngx_open_file_cache_cleanup(void *data)
76 {
77 ngx_open_file_cache_t *cache = data;
78
79 ngx_queue_t *q;
80 ngx_cached_open_file_t *file;
81
82 ngx_log_debug0(NGX_LOG_DEBUG_CORE, ngx_cycle->log, 0,
83 "open file cache cleanup");
84
85 for ( ;; ) {
86
87 if (ngx_queue_empty(&cache->expire_queue)) {
88 break;
89 }
90
91 q = ngx_queue_last(&cache->expire_queue);
92
93 file = ngx_queue_data(q, ngx_cached_open_file_t, queue);
94
95 ngx_queue_remove(q);
96
97 ngx_rbtree_delete(&cache->rbtree, &file->node);
98
99 cache->current--;
100
101 ngx_log_debug1(NGX_LOG_DEBUG_CORE, ngx_cycle->log, 0,
102 "delete cached open file: %s", file->name);
103
104 if (!file->err && !file->is_dir) {
105 file->close = 1;
106 file->count = 0;
107 ngx_close_cached_file(cache, file, 0, ngx_cycle->log);
108
109 } else {
110 ngx_free(file->name);
111 ngx_free(file);
112 }
113 }
114
115 if (cache->current) {
116 ngx_log_error(NGX_LOG_ALERT, ngx_cycle->log, 0,
117 "%d items still leave in open file cache",
118 cache->current);
119 }
120
121 if (cache->rbtree.root != cache->rbtree.sentinel) {
122 ngx_log_error(NGX_LOG_ALERT, ngx_cycle->log, 0,
123 "rbtree still is not empty in open file cache");
124
125 }
126 }
127
128
129 ngx_int_t
130 ngx_open_cached_file(ngx_open_file_cache_t *cache, ngx_str_t *name,
131 ngx_open_file_info_t *of, ngx_pool_t *pool)
132 {
133 time_t now;
134 uint32_t hash;
135 ngx_int_t rc;
136 ngx_file_info_t fi;
137 ngx_pool_cleanup_t *cln;
138 ngx_cached_open_file_t *file;
139 ngx_pool_cleanup_file_t *clnf;
140 ngx_open_file_cache_cleanup_t *ofcln;
141
142 of->fd = NGX_INVALID_FILE;
143 of->err = 0;
144
145 if (cache == NULL) {
146
147 if (of->test_only) {
148
149 if (ngx_file_info(name->data, &fi) == NGX_FILE_ERROR) {
150 of->err = ngx_errno;
151 of->failed = ngx_file_info_n;
152 return NGX_ERROR;
153 }
154
155 of->uniq = ngx_file_uniq(&fi);
156 of->mtime = ngx_file_mtime(&fi);
157 of->size = ngx_file_size(&fi);
158 of->is_dir = ngx_is_dir(&fi);
159 of->is_file = ngx_is_file(&fi);
160 of->is_link = ngx_is_link(&fi);
161 of->is_exec = ngx_is_exec(&fi);
162
163 return NGX_OK;
164 }
165
166 cln = ngx_pool_cleanup_add(pool, sizeof(ngx_pool_cleanup_file_t));
167 if (cln == NULL) {
168 return NGX_ERROR;
169 }
170
171 rc = ngx_open_and_stat_file(name->data, of, pool->log);
172
173 if (rc == NGX_OK && !of->is_dir) {
174 cln->handler = ngx_pool_cleanup_file;
175 clnf = cln->data;
176
177 clnf->fd = of->fd;
178 clnf->name = name->data;
179 clnf->log = pool->log;
180 }
181
182 return rc;
183 }
184
185 cln = ngx_pool_cleanup_add(pool, sizeof(ngx_open_file_cache_cleanup_t));
186 if (cln == NULL) {
187 return NGX_ERROR;
188 }
189
190 now = ngx_time();
191
192 hash = ngx_crc32_long(name->data, name->len);
193
194 file = ngx_open_file_lookup(cache, name, hash);
195
196 if (file) {
197
198 file->uses++;
199
200 ngx_queue_remove(&file->queue);
201
202 if (file->fd == NGX_INVALID_FILE && file->err == 0 && !file->is_dir) {
203
204 /* file was not used often enough to keep open */
205
206 rc = ngx_open_and_stat_file(name->data, of, pool->log);
207
208 if (rc != NGX_OK && (of->err == 0 || !of->errors)) {
209 goto failed;
210 }
211
212 goto add_event;
213 }
214
215 if (file->use_event
216 || (file->event == NULL
217 && (of->uniq == 0 || of->uniq == file->uniq)
218 && now - file->created < of->valid))
219 {
220 if (file->err == 0) {
221
222 of->fd = file->fd;
223 of->uniq = file->uniq;
224 of->mtime = file->mtime;
225 of->size = file->size;
226
227 of->is_dir = file->is_dir;
228 of->is_file = file->is_file;
229 of->is_link = file->is_link;
230 of->is_exec = file->is_exec;
231 of->is_directio = file->is_directio;
232
233 if (!file->is_dir) {
234 file->count++;
235 ngx_open_file_add_event(cache, file, of, pool->log);
236 }
237
238 } else {
239 of->err = file->err;
240 of->failed = ngx_open_file_n;
241 }
242
243 goto found;
244 }
245
246 ngx_log_debug4(NGX_LOG_DEBUG_CORE, pool->log, 0,
247 "retest open file: %s, fd:%d, c:%d, e:%d",
248 file->name, file->fd, file->count, file->err);
249
250 if (file->is_dir) {
251
252 /*
253 * chances that directory became file are very small
254 * so test_dir flag allows to use a single syscall
255 * in ngx_file_info() instead of three syscalls
256 */
257
258 of->test_dir = 1;
259 }
260
261 of->fd = file->fd;
262 of->uniq = file->uniq;
263
264 rc = ngx_open_and_stat_file(name->data, of, pool->log);
265
266 if (rc != NGX_OK && (of->err == 0 || !of->errors)) {
267 goto failed;
268 }
269
270 if (of->is_dir) {
271
272 if (file->is_dir || file->err) {
273 goto update;
274 }
275
276 /* file became directory */
277
278 } else if (of->err == 0) { /* file */
279
280 if (file->is_dir || file->err) {
281 goto add_event;
282 }
283
284 if (of->uniq == file->uniq) {
285
286 file->count++;
287
288 if (file->event) {
289 file->use_event = 1;
290 }
291
292 goto renew;
293 }
294
295 /* file was changed */
296
297 } else { /* error to cache */
298
299 if (file->err || file->is_dir) {
300 goto update;
301 }
302
303 /* file was removed, etc. */
304 }
305
306 if (file->count == 0) {
307
308 ngx_open_file_del_event(file);
309
310 if (ngx_close_file(file->fd) == NGX_FILE_ERROR) {
311 ngx_log_error(NGX_LOG_ALERT, pool->log, ngx_errno,
312 ngx_close_file_n " \"%s\" failed",
313 name->data);
314 }
315
316 goto add_event;
317 }
318
319 ngx_rbtree_delete(&cache->rbtree, &file->node);
320
321 cache->current--;
322
323 file->close = 1;
324
325 goto create;
326 }
327
328 /* not found */
329
330 rc = ngx_open_and_stat_file(name->data, of, pool->log);
331
332 if (rc != NGX_OK && (of->err == 0 || !of->errors)) {
333 goto failed;
334 }
335
336 create:
337
338 if (cache->current >= cache->max) {
339 ngx_expire_old_cached_files(cache, 0, pool->log);
340 }
341
342 file = ngx_alloc(sizeof(ngx_cached_open_file_t), pool->log);
343
344 if (file == NULL) {
345 goto failed;
346 }
347
348 file->name = ngx_alloc(name->len + 1, pool->log);
349
350 if (file->name == NULL) {
351 ngx_free(file);
352 file = NULL;
353 goto failed;
354 }
355
356 ngx_cpystrn(file->name, name->data, name->len + 1);
357
358 file->node.key = hash;
359
360 ngx_rbtree_insert(&cache->rbtree, &file->node);
361
362 cache->current++;
363
364 file->uses = 1;
365 file->count = 0;
366 file->use_event = 0;
367 file->event = NULL;
368
369 add_event:
370
371 ngx_open_file_add_event(cache, file, of, pool->log);
372
373 update:
374
375 file->fd = of->fd;
376 file->err = of->err;
377
378 if (of->err == 0) {
379 file->uniq = of->uniq;
380 file->mtime = of->mtime;
381 file->size = of->size;
382
383 file->close = 0;
384
385 file->is_dir = of->is_dir;
386 file->is_file = of->is_file;
387 file->is_link = of->is_link;
388 file->is_exec = of->is_exec;
389 file->is_directio = of->is_directio;
390
391 if (!of->is_dir) {
392 file->count++;
393 }
394 }
395
396 renew:
397
398 file->created = now;
399
400 found:
401
402 file->accessed = now;
403
404 ngx_queue_insert_head(&cache->expire_queue, &file->queue);
405
406 ngx_log_debug5(NGX_LOG_DEBUG_CORE, pool->log, 0,
407 "cached open file: %s, fd:%d, c:%d, e:%d, u:%d",
408 file->name, file->fd, file->count, file->err, file->uses);
409
410 if (of->err == 0) {
411
412 if (!of->is_dir) {
413 cln->handler = ngx_open_file_cleanup;
414 ofcln = cln->data;
415
416 ofcln->cache = cache;
417 ofcln->file = file;
418 ofcln->min_uses = of->min_uses;
419 ofcln->log = pool->log;
420 }
421
422 return NGX_OK;
423 }
424
425 return NGX_ERROR;
426
427 failed:
428
429 if (file) {
430 ngx_rbtree_delete(&cache->rbtree, &file->node);
431
432 cache->current--;
433
434 if (file->count == 0) {
435
436 if (file->fd != NGX_INVALID_FILE) {
437 if (ngx_close_file(file->fd) == NGX_FILE_ERROR) {
438 ngx_log_error(NGX_LOG_ALERT, pool->log, ngx_errno,
439 ngx_close_file_n " \"%s\" failed",
440 file->name);
441 }
442 }
443
444 ngx_free(file->name);
445 ngx_free(file);
446
447 } else {
448 file->close = 1;
449 }
450 }
451
452 if (of->fd != NGX_INVALID_FILE) {
453 if (ngx_close_file(of->fd) == NGX_FILE_ERROR) {
454 ngx_log_error(NGX_LOG_ALERT, pool->log, ngx_errno,
455 ngx_close_file_n " \"%s\" failed", name->data);
456 }
457 }
458
459 return NGX_ERROR;
460 }
461
462
463 static ngx_int_t
464 ngx_open_and_stat_file(u_char *name, ngx_open_file_info_t *of, ngx_log_t *log)
465 {
466 ngx_fd_t fd;
467 ngx_file_info_t fi;
468
469 if (of->fd != NGX_INVALID_FILE) {
470
471 if (ngx_file_info(name, &fi) == NGX_FILE_ERROR) {
472 of->failed = ngx_file_info_n;
473 goto failed;
474 }
475
476 if (of->uniq == ngx_file_uniq(&fi)) {
477 goto done;
478 }
479
480 } else if (of->test_dir) {
481
482 if (ngx_file_info(name, &fi) == NGX_FILE_ERROR) {
483 of->failed = ngx_file_info_n;
484 goto failed;
485 }
486
487 if (ngx_is_dir(&fi)) {
488 goto done;
489 }
490 }
491
492 if (!of->log) {
493 fd = ngx_open_file(name, NGX_FILE_RDONLY, NGX_FILE_OPEN, 0);
494
495 } else {
496 fd = ngx_open_file(name, NGX_FILE_APPEND, NGX_FILE_CREATE_OR_OPEN,
497 NGX_FILE_DEFAULT_ACCESS);
498 }
499
500 if (fd == NGX_INVALID_FILE) {
501 of->failed = ngx_open_file_n;
502 goto failed;
503 }
504
505 if (ngx_fd_info(fd, &fi) == NGX_FILE_ERROR) {
506 ngx_log_error(NGX_LOG_CRIT, log, ngx_errno,
507 ngx_fd_info_n " \"%s\" failed", name);
508
509 if (ngx_close_file(fd) == NGX_FILE_ERROR) {
510 ngx_log_error(NGX_LOG_ALERT, log, ngx_errno,
511 ngx_close_file_n " \"%s\" failed", name);
512 }
513
514 of->fd = NGX_INVALID_FILE;
515
516 return NGX_ERROR;
517 }
518
519 if (ngx_is_dir(&fi)) {
520 if (ngx_close_file(fd) == NGX_FILE_ERROR) {
521 ngx_log_error(NGX_LOG_ALERT, log, ngx_errno,
522 ngx_close_file_n " \"%s\" failed", name);
523 }
524
525 of->fd = NGX_INVALID_FILE;
526
527 } else {
528 of->fd = fd;
529
530 if (of->read_ahead && ngx_file_size(&fi) > NGX_MIN_READ_AHEAD) {
531 if (ngx_read_ahead(fd, of->read_ahead) == NGX_ERROR) {
532 ngx_log_error(NGX_LOG_ALERT, log, ngx_errno,
533 ngx_read_ahead_n " \"%s\" failed", name);
534 }
535 }
536
537 if (of->directio <= ngx_file_size(&fi)) {
538 if (ngx_directio_on(fd) == NGX_FILE_ERROR) {
539 ngx_log_error(NGX_LOG_ALERT, log, ngx_errno,
540 ngx_directio_on_n " \"%s\" failed", name);
541
542 } else {
543 of->is_directio = 1;
544 }
545 }
546 }
547
548 done:
549
550 of->uniq = ngx_file_uniq(&fi);
551 of->mtime = ngx_file_mtime(&fi);
552 of->size = ngx_file_size(&fi);
553 of->is_dir = ngx_is_dir(&fi);
554 of->is_file = ngx_is_file(&fi);
555 of->is_link = ngx_is_link(&fi);
556 of->is_exec = ngx_is_exec(&fi);
557
558 return NGX_OK;
559
560 failed:
561
562 of->fd = NGX_INVALID_FILE;
563 of->err = ngx_errno;
564
565 return NGX_ERROR;
566 }
567
568
569 /*
570 * we ignore any possible event setting error and
571 * fallback to usual periodic file retests
572 */
573
574 static void
575 ngx_open_file_add_event(ngx_open_file_cache_t *cache,
576 ngx_cached_open_file_t *file, ngx_open_file_info_t *of, ngx_log_t *log)
577 {
578 ngx_open_file_cache_event_t *fev;
579
580 if (!(ngx_event_flags & NGX_USE_VNODE_EVENT)
581 || !of->events
582 || file->event
583 || of->fd == NGX_INVALID_FILE
584 || file->uses < of->min_uses)
585 {
586 return;
587 }
588
589 file->use_event = 0;
590
591 file->event = ngx_calloc(sizeof(ngx_event_t), log);
592 if (file->event== NULL) {
593 return;
594 }
595
596 fev = ngx_alloc(sizeof(ngx_open_file_cache_event_t), log);
597 if (fev == NULL) {
598 ngx_free(file->event);
599 file->event = NULL;
600 return;
601 }
602
603 fev->fd = of->fd;
604 fev->file = file;
605 fev->cache = cache;
606
607 file->event->handler = ngx_open_file_cache_remove;
608 file->event->data = fev;
609
610 /*
611 * although vnode event may be called while ngx_cycle->poll
612 * destruction, however, cleanup procedures are run before any
613 * memory freeing and events will be canceled.
614 */
615
616 file->event->log = ngx_cycle->log;
617
618 if (ngx_add_event(file->event, NGX_VNODE_EVENT, NGX_ONESHOT_EVENT)
619 != NGX_OK)
620 {
621 ngx_free(file->event->data);
622 ngx_free(file->event);
623 file->event = NULL;
624 return;
625 }
626
627 /*
628 * we do not set file->use_event here because there may be a race
629 * condition: a file may be deleted between opening the file and
630 * adding event, so we rely upon event notification only after
631 * one file revalidation on next file access
632 */
633
634 return;
635 }
636
637
638 static void
639 ngx_open_file_cleanup(void *data)
640 {
641 ngx_open_file_cache_cleanup_t *c = data;
642
643 c->file->count--;
644
645 ngx_close_cached_file(c->cache, c->file, c->min_uses, c->log);
646
647 /* drop one or two expired open files */
648 ngx_expire_old_cached_files(c->cache, 1, c->log);
649 }
650
651
652 static void
653 ngx_close_cached_file(ngx_open_file_cache_t *cache,
654 ngx_cached_open_file_t *file, ngx_uint_t min_uses, ngx_log_t *log)
655 {
656 ngx_log_debug5(NGX_LOG_DEBUG_CORE, log, 0,
657 "close cached open file: %s, fd:%d, c:%d, u:%d, %d",
658 file->name, file->fd, file->count, file->uses, file->close);
659
660 if (!file->close) {
661
662 file->accessed = ngx_time();
663
664 ngx_queue_remove(&file->queue);
665
666 ngx_queue_insert_head(&cache->expire_queue, &file->queue);
667
668 if (file->uses >= min_uses || file->count) {
669 return;
670 }
671 }
672
673 ngx_open_file_del_event(file);
674
675 if (file->count) {
676 return;
677 }
678
679 if (file->fd != NGX_INVALID_FILE) {
680
681 if (ngx_close_file(file->fd) == NGX_FILE_ERROR) {
682 ngx_log_error(NGX_LOG_ALERT, log, ngx_errno,
683 ngx_close_file_n " \"%s\" failed", file->name);
684 }
685
686 file->fd = NGX_INVALID_FILE;
687 }
688
689 if (!file->close) {
690 return;
691 }
692
693 ngx_free(file->name);
694 ngx_free(file);
695 }
696
697
698 static void
699 ngx_open_file_del_event(ngx_cached_open_file_t *file)
700 {
701 if (file->event == NULL) {
702 return;
703 }
704
705 (void) ngx_del_event(file->event, NGX_VNODE_EVENT,
706 file->count ? NGX_FLUSH_EVENT : NGX_CLOSE_EVENT);
707
708 ngx_free(file->event->data);
709 ngx_free(file->event);
710 file->event = NULL;
711 file->use_event = 0;
712 }
713
714
715 static void
716 ngx_expire_old_cached_files(ngx_open_file_cache_t *cache, ngx_uint_t n,
717 ngx_log_t *log)
718 {
719 time_t now;
720 ngx_queue_t *q;
721 ngx_cached_open_file_t *file;
722
723 now = ngx_time();
724
725 /*
726 * n == 1 deletes one or two inactive files
727 * n == 0 deletes least recently used file by force
728 * and one or two inactive files
729 */
730
731 while (n < 3) {
732
733 if (ngx_queue_empty(&cache->expire_queue)) {
734 return;
735 }
736
737 q = ngx_queue_last(&cache->expire_queue);
738
739 file = ngx_queue_data(q, ngx_cached_open_file_t, queue);
740
741 if (n++ != 0 && now - file->accessed <= cache->inactive) {
742 return;
743 }
744
745 ngx_queue_remove(q);
746
747 ngx_rbtree_delete(&cache->rbtree, &file->node);
748
749 cache->current--;
750
751 ngx_log_debug1(NGX_LOG_DEBUG_CORE, log, 0,
752 "expire cached open file: %s", file->name);
753
754 if (!file->err && !file->is_dir) {
755 file->close = 1;
756 ngx_close_cached_file(cache, file, 0, log);
757
758 } else {
759 ngx_free(file->name);
760 ngx_free(file);
761 }
762 }
763 }
764
765
766 static void
767 ngx_open_file_cache_rbtree_insert_value(ngx_rbtree_node_t *temp,
768 ngx_rbtree_node_t *node, ngx_rbtree_node_t *sentinel)
769 {
770 ngx_rbtree_node_t **p;
771 ngx_cached_open_file_t *file, *file_temp;
772
773 for ( ;; ) {
774
775 if (node->key < temp->key) {
776
777 p = &temp->left;
778
779 } else if (node->key > temp->key) {
780
781 p = &temp->right;
782
783 } else { /* node->key == temp->key */
784
785 file = (ngx_cached_open_file_t *) node;
786 file_temp = (ngx_cached_open_file_t *) temp;
787
788 p = (ngx_strcmp(file->name, file_temp->name) < 0)
789 ? &temp->left : &temp->right;
790 }
791
792 if (*p == sentinel) {
793 break;
794 }
795
796 temp = *p;
797 }
798
799 *p = node;
800 node->parent = temp;
801 node->left = sentinel;
802 node->right = sentinel;
803 ngx_rbt_red(node);
804 }
805
806
807 static ngx_cached_open_file_t *
808 ngx_open_file_lookup(ngx_open_file_cache_t *cache, ngx_str_t *name,
809 uint32_t hash)
810 {
811 ngx_int_t rc;
812 ngx_rbtree_node_t *node, *sentinel;
813 ngx_cached_open_file_t *file;
814
815 node = cache->rbtree.root;
816 sentinel = cache->rbtree.sentinel;
817
818 while (node != sentinel) {
819
820 if (hash < node->key) {
821 node = node->left;
822 continue;
823 }
824
825 if (hash > node->key) {
826 node = node->right;
827 continue;
828 }
829
830 /* hash == node->key */
831
832 do {
833 file = (ngx_cached_open_file_t *) node;
834
835 rc = ngx_strcmp(name->data, file->name);
836
837 if (rc == 0) {
838 return file;
839 }
840
841 node = (rc < 0) ? node->left : node->right;
842
843 } while (node != sentinel && hash == node->key);
844
845 break;
846 }
847
848 return NULL;
849 }
850
851
852 static void
853 ngx_open_file_cache_remove(ngx_event_t *ev)
854 {
855 ngx_cached_open_file_t *file;
856 ngx_open_file_cache_event_t *fev;
857
858 fev = ev->data;
859 file = fev->file;
860
861 ngx_queue_remove(&file->queue);
862
863 ngx_rbtree_delete(&fev->cache->rbtree, &file->node);
864
865 fev->cache->current--;
866
867 /* NGX_ONESHOT_EVENT was already deleted */
868 file->event = NULL;
869 file->use_event = 0;
870
871 file->close = 1;
872
873 ngx_close_cached_file(fev->cache, file, 0, ev->log);
874
875 /* free memory only when fev->cache and fev->file are already not needed */
876
877 ngx_free(ev->data);
878 ngx_free(ev);
879 }
880
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