Mercurial > hg > nginx
annotate src/core/ngx_open_file_cache.c @ 1986:7df9b30e2361
fix segfault when file is deleted and open_file_cache_errors is off
author | Igor Sysoev <igor@sysoev.ru> |
---|---|
date | Tue, 29 Apr 2008 14:39:15 +0000 |
parents | ed71d58c0cf3 |
children | 0e628cf11c29 |
rev | line source |
---|---|
1453 | 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 static void ngx_open_file_cache_cleanup(void *data); | |
1775 | 21 static ngx_int_t ngx_open_and_stat_file(u_char *name, ngx_open_file_info_t *of, |
22 ngx_log_t *log); | |
23 static void ngx_open_file_add_event(ngx_open_file_cache_t *cache, | |
24 ngx_cached_open_file_t *file, ngx_open_file_info_t *of, ngx_log_t *log); | |
1453 | 25 static void ngx_open_file_cleanup(void *data); |
26 static void ngx_close_cached_file(ngx_open_file_cache_t *cache, | |
1772 | 27 ngx_cached_open_file_t *file, ngx_uint_t min_uses, ngx_log_t *log); |
1775 | 28 static void ngx_open_file_del_event(ngx_cached_open_file_t *file); |
1453 | 29 static void ngx_expire_old_cached_files(ngx_open_file_cache_t *cache, |
30 ngx_uint_t n, ngx_log_t *log); | |
31 static void ngx_open_file_cache_rbtree_insert_value(ngx_rbtree_node_t *temp, | |
32 ngx_rbtree_node_t *node, ngx_rbtree_node_t *sentinel); | |
1775 | 33 static ngx_cached_open_file_t * |
34 ngx_open_file_lookup(ngx_open_file_cache_t *cache, ngx_str_t *name, | |
35 uint32_t hash); | |
1453 | 36 static void ngx_open_file_cache_remove(ngx_event_t *ev); |
37 | |
38 | |
39 ngx_open_file_cache_t * | |
40 ngx_open_file_cache_init(ngx_pool_t *pool, ngx_uint_t max, time_t inactive) | |
41 { | |
42 ngx_pool_cleanup_t *cln; | |
43 ngx_open_file_cache_t *cache; | |
44 | |
45 cache = ngx_palloc(pool, sizeof(ngx_open_file_cache_t)); | |
46 if (cache == NULL) { | |
47 return NULL; | |
48 } | |
49 | |
1761 | 50 ngx_rbtree_init(&cache->rbtree, &cache->sentinel, |
1743
4fc402c3ec73
optimize rbtree initialization and insert
Igor Sysoev <igor@sysoev.ru>
parents:
1458
diff
changeset
|
51 ngx_open_file_cache_rbtree_insert_value); |
1453 | 52 |
1765 | 53 ngx_queue_init(&cache->expire_queue); |
54 | |
1453 | 55 cache->current = 0; |
56 cache->max = max; | |
57 cache->inactive = inactive; | |
58 | |
59 cln = ngx_pool_cleanup_add(pool, 0); | |
60 if (cln == NULL) { | |
61 return NULL; | |
62 } | |
63 | |
64 cln->handler = ngx_open_file_cache_cleanup; | |
65 cln->data = cache; | |
66 | |
67 return cache; | |
68 } | |
69 | |
70 | |
71 static void | |
72 ngx_open_file_cache_cleanup(void *data) | |
73 { | |
74 ngx_open_file_cache_t *cache = data; | |
75 | |
1765 | 76 ngx_queue_t *q; |
1453 | 77 ngx_cached_open_file_t *file; |
78 | |
79 ngx_log_debug0(NGX_LOG_DEBUG_CORE, ngx_cycle->log, 0, | |
80 "open file cache cleanup"); | |
81 | |
82 for ( ;; ) { | |
83 | |
1765 | 84 if (ngx_queue_empty(&cache->expire_queue)) { |
1766 | 85 break; |
1453 | 86 } |
87 | |
1765 | 88 q = ngx_queue_last(&cache->expire_queue); |
89 | |
90 file = ngx_queue_data(q, ngx_cached_open_file_t, queue); | |
91 | |
92 ngx_queue_remove(q); | |
1453 | 93 |
94 ngx_rbtree_delete(&cache->rbtree, &file->node); | |
95 | |
96 cache->current--; | |
97 | |
98 ngx_log_debug1(NGX_LOG_DEBUG_CORE, ngx_cycle->log, 0, | |
99 "delete cached open file: %s", file->name); | |
100 | |
101 if (!file->err && !file->is_dir) { | |
102 file->close = 1; | |
103 file->count = 0; | |
1772 | 104 ngx_close_cached_file(cache, file, 0, ngx_cycle->log); |
1453 | 105 |
106 } else { | |
107 ngx_free(file->name); | |
108 ngx_free(file); | |
109 } | |
110 } | |
111 | |
112 if (cache->current) { | |
113 ngx_log_error(NGX_LOG_ALERT, ngx_cycle->log, 0, | |
114 "%d items still leave in open file cache", | |
115 cache->current); | |
116 } | |
117 | |
118 if (cache->rbtree.root != cache->rbtree.sentinel) { | |
119 ngx_log_error(NGX_LOG_ALERT, ngx_cycle->log, 0, | |
120 "rbtree still is not empty in open file cache"); | |
121 | |
122 } | |
123 } | |
124 | |
125 | |
126 ngx_int_t | |
127 ngx_open_cached_file(ngx_open_file_cache_t *cache, ngx_str_t *name, | |
128 ngx_open_file_info_t *of, ngx_pool_t *pool) | |
129 { | |
130 time_t now; | |
131 uint32_t hash; | |
132 ngx_int_t rc; | |
133 ngx_pool_cleanup_t *cln; | |
134 ngx_cached_open_file_t *file; | |
135 ngx_pool_cleanup_file_t *clnf; | |
136 ngx_open_file_cache_cleanup_t *ofcln; | |
137 | |
138 of->err = 0; | |
139 | |
140 if (cache == NULL) { | |
141 | |
142 cln = ngx_pool_cleanup_add(pool, sizeof(ngx_pool_cleanup_file_t)); | |
143 if (cln == NULL) { | |
144 return NGX_ERROR; | |
145 } | |
146 | |
147 rc = ngx_open_and_stat_file(name->data, of, pool->log); | |
148 | |
149 if (rc == NGX_OK && !of->is_dir) { | |
150 cln->handler = ngx_pool_cleanup_file; | |
151 clnf = cln->data; | |
152 | |
153 clnf->fd = of->fd; | |
154 clnf->name = name->data; | |
155 clnf->log = pool->log; | |
156 } | |
157 | |
158 return rc; | |
159 } | |
160 | |
161 cln = ngx_pool_cleanup_add(pool, sizeof(ngx_open_file_cache_cleanup_t)); | |
162 if (cln == NULL) { | |
163 return NGX_ERROR; | |
164 } | |
165 | |
166 now = ngx_time(); | |
167 | |
1775 | 168 hash = ngx_crc32_long(name->data, name->len); |
169 | |
170 file = ngx_open_file_lookup(cache, name, hash); | |
171 | |
172 if (file) { | |
173 | |
174 file->uses++; | |
175 | |
176 if (file->fd == NGX_INVALID_FILE && file->err == 0 && !file->is_dir) { | |
177 | |
178 /* file was not used often enough to keep open */ | |
179 | |
180 rc = ngx_open_and_stat_file(name->data, of, pool->log); | |
1453 | 181 |
1775 | 182 if (rc != NGX_OK && (of->err == 0 || !of->errors)) { |
183 goto failed; | |
184 } | |
185 | |
1986
7df9b30e2361
fix segfault when file is deleted and open_file_cache_errors is off
Igor Sysoev <igor@sysoev.ru>
parents:
1938
diff
changeset
|
186 ngx_queue_remove(&file->queue); |
7df9b30e2361
fix segfault when file is deleted and open_file_cache_errors is off
Igor Sysoev <igor@sysoev.ru>
parents:
1938
diff
changeset
|
187 |
1775 | 188 goto add_event; |
1453 | 189 } |
190 | |
1775 | 191 if ((file->event && file->use_event) |
192 || (file->event == NULL && now - file->created < of->valid)) | |
193 { | |
194 if (file->err == 0) { | |
1772 | 195 |
1775 | 196 of->fd = file->fd; |
197 of->uniq = file->uniq; | |
198 of->mtime = file->mtime; | |
199 of->size = file->size; | |
1453 | 200 |
1775 | 201 of->is_dir = file->is_dir; |
202 of->is_file = file->is_file; | |
203 of->is_link = file->is_link; | |
204 of->is_exec = file->is_exec; | |
1453 | 205 |
1775 | 206 if (!file->is_dir) { |
207 file->count++; | |
208 ngx_open_file_add_event(cache, file, of, pool->log); | |
1453 | 209 } |
210 | |
1775 | 211 } else { |
212 of->err = file->err; | |
213 } | |
214 | |
1986
7df9b30e2361
fix segfault when file is deleted and open_file_cache_errors is off
Igor Sysoev <igor@sysoev.ru>
parents:
1938
diff
changeset
|
215 ngx_queue_remove(&file->queue); |
7df9b30e2361
fix segfault when file is deleted and open_file_cache_errors is off
Igor Sysoev <igor@sysoev.ru>
parents:
1938
diff
changeset
|
216 |
1775 | 217 goto found; |
218 } | |
219 | |
220 ngx_log_debug4(NGX_LOG_DEBUG_CORE, pool->log, 0, | |
221 "retest open file: %s, fd:%d, c:%d, e:%d", | |
222 file->name, file->fd, file->count, file->err); | |
1453 | 223 |
1775 | 224 if (file->is_dir) { |
225 | |
226 /* | |
227 * chances that directory became file are very small | |
228 * so test_dir flag allows to use a single syscall | |
229 * in ngx_file_info() instead of three syscalls | |
230 */ | |
231 | |
232 of->test_dir = 1; | |
233 } | |
234 | |
235 rc = ngx_open_and_stat_file(name->data, of, pool->log); | |
1453 | 236 |
1775 | 237 if (rc != NGX_OK && (of->err == 0 || !of->errors)) { |
238 goto failed; | |
239 } | |
240 | |
1986
7df9b30e2361
fix segfault when file is deleted and open_file_cache_errors is off
Igor Sysoev <igor@sysoev.ru>
parents:
1938
diff
changeset
|
241 ngx_queue_remove(&file->queue); |
7df9b30e2361
fix segfault when file is deleted and open_file_cache_errors is off
Igor Sysoev <igor@sysoev.ru>
parents:
1938
diff
changeset
|
242 |
1775 | 243 if (of->is_dir) { |
244 | |
245 if (file->is_dir || file->err) { | |
246 goto update; | |
247 } | |
248 | |
249 /* file became directory */ | |
1453 | 250 |
1775 | 251 } else if (of->err == 0) { /* file */ |
252 | |
253 if (file->is_dir || file->err) { | |
254 goto add_event; | |
255 } | |
1453 | 256 |
1775 | 257 if (of->uniq == file->uniq |
258 && of->mtime == file->mtime | |
259 && of->size == file->size) | |
260 { | |
261 if (ngx_close_file(of->fd) == NGX_FILE_ERROR) { | |
262 ngx_log_error(NGX_LOG_ALERT, pool->log, ngx_errno, | |
263 ngx_close_file_n " \"%s\" failed", | |
264 name->data); | |
1453 | 265 } |
266 | |
1775 | 267 of->fd = file->fd; |
268 file->count++; | |
1453 | 269 |
1775 | 270 if (file->event) { |
271 file->use_event = 1; | |
272 goto renew; | |
1453 | 273 } |
274 | |
1775 | 275 ngx_open_file_add_event(cache, file, of, pool->log); |
276 | |
277 goto renew; | |
278 } | |
1453 | 279 |
1775 | 280 /* file was changed */ |
1453 | 281 |
1775 | 282 } else { /* error to cache */ |
1453 | 283 |
1775 | 284 if (file->err || file->is_dir) { |
285 goto update; | |
1453 | 286 } |
287 | |
1775 | 288 /* file was removed, etc. */ |
289 } | |
290 | |
291 if (file->count == 0) { | |
292 | |
293 ngx_open_file_del_event(file); | |
1453 | 294 |
1775 | 295 if (ngx_close_file(file->fd) == NGX_FILE_ERROR) { |
296 ngx_log_error(NGX_LOG_ALERT, pool->log, ngx_errno, | |
297 ngx_close_file_n " \"%s\" failed", | |
298 name->data); | |
299 } | |
1453 | 300 |
1775 | 301 goto add_event; |
302 } | |
303 | |
304 ngx_rbtree_delete(&cache->rbtree, &file->node); | |
305 | |
306 cache->current--; | |
307 | |
308 file->close = 1; | |
309 | |
310 goto create; | |
1453 | 311 } |
312 | |
313 /* not found */ | |
314 | |
315 rc = ngx_open_and_stat_file(name->data, of, pool->log); | |
316 | |
317 if (rc != NGX_OK && (of->err == 0 || !of->errors)) { | |
318 goto failed; | |
319 } | |
320 | |
321 create: | |
322 | |
323 if (cache->current >= cache->max) { | |
324 ngx_expire_old_cached_files(cache, 0, pool->log); | |
325 } | |
326 | |
327 file = ngx_alloc(sizeof(ngx_cached_open_file_t), pool->log); | |
328 | |
329 if (file == NULL) { | |
330 goto failed; | |
331 } | |
332 | |
333 file->name = ngx_alloc(name->len + 1, pool->log); | |
334 | |
335 if (file->name == NULL) { | |
336 ngx_free(file); | |
337 file = NULL; | |
338 goto failed; | |
339 } | |
340 | |
341 ngx_cpystrn(file->name, name->data, name->len + 1); | |
342 | |
343 file->node.key = hash; | |
344 | |
345 ngx_rbtree_insert(&cache->rbtree, &file->node); | |
346 | |
347 cache->current++; | |
348 | |
1775 | 349 file->uses = 1; |
1453 | 350 file->count = 0; |
1775 | 351 file->use_event = 0; |
352 file->event = NULL; | |
353 | |
354 add_event: | |
355 | |
356 ngx_open_file_add_event(cache, file, of, pool->log); | |
1453 | 357 |
358 update: | |
359 | |
360 file->fd = of->fd; | |
361 file->err = of->err; | |
362 | |
363 if (of->err == 0) { | |
364 file->uniq = of->uniq; | |
365 file->mtime = of->mtime; | |
366 file->size = of->size; | |
367 | |
368 file->close = 0; | |
369 | |
370 file->is_dir = of->is_dir; | |
371 file->is_file = of->is_file; | |
372 file->is_link = of->is_link; | |
373 file->is_exec = of->is_exec; | |
374 | |
375 if (!of->is_dir) { | |
376 file->count++; | |
377 } | |
378 } | |
379 | |
380 renew: | |
381 | |
382 file->created = now; | |
383 | |
384 found: | |
385 | |
386 file->accessed = now; | |
387 | |
1765 | 388 ngx_queue_insert_head(&cache->expire_queue, &file->queue); |
1453 | 389 |
1772 | 390 ngx_log_debug5(NGX_LOG_DEBUG_CORE, pool->log, 0, |
391 "cached open file: %s, fd:%d, c:%d, e:%d, u:%d", | |
392 file->name, file->fd, file->count, file->err, file->uses); | |
1453 | 393 |
394 if (of->err == 0) { | |
395 | |
396 if (!of->is_dir) { | |
397 cln->handler = ngx_open_file_cleanup; | |
398 ofcln = cln->data; | |
399 | |
400 ofcln->cache = cache; | |
401 ofcln->file = file; | |
1772 | 402 ofcln->min_uses = of->min_uses; |
1453 | 403 ofcln->log = pool->log; |
404 } | |
405 | |
406 return NGX_OK; | |
407 } | |
408 | |
409 return NGX_ERROR; | |
410 | |
411 failed: | |
412 | |
413 if (file && file->count == 0) { | |
414 ngx_rbtree_delete(&cache->rbtree, &file->node); | |
415 | |
416 cache->current--; | |
417 | |
1938 | 418 if (file->fd != NGX_INVALID_FILE) { |
1937
c46432b9dbb7
fix case when errors are not cached,
Igor Sysoev <igor@sysoev.ru>
parents:
1936
diff
changeset
|
419 if (ngx_close_file(file->fd) == NGX_FILE_ERROR) { |
c46432b9dbb7
fix case when errors are not cached,
Igor Sysoev <igor@sysoev.ru>
parents:
1936
diff
changeset
|
420 ngx_log_error(NGX_LOG_ALERT, pool->log, ngx_errno, |
c46432b9dbb7
fix case when errors are not cached,
Igor Sysoev <igor@sysoev.ru>
parents:
1936
diff
changeset
|
421 ngx_close_file_n " \"%s\" failed", file->name); |
c46432b9dbb7
fix case when errors are not cached,
Igor Sysoev <igor@sysoev.ru>
parents:
1936
diff
changeset
|
422 } |
1453 | 423 } |
424 | |
425 ngx_free(file->name); | |
426 ngx_free(file); | |
427 } | |
428 | |
429 if (of->fd != NGX_INVALID_FILE) { | |
430 if (ngx_close_file(of->fd) == NGX_FILE_ERROR) { | |
431 ngx_log_error(NGX_LOG_ALERT, pool->log, ngx_errno, | |
432 ngx_close_file_n " \"%s\" failed", name->data); | |
433 } | |
434 } | |
435 | |
436 return NGX_ERROR; | |
437 } | |
438 | |
439 | |
440 static ngx_int_t | |
441 ngx_open_and_stat_file(u_char *name, ngx_open_file_info_t *of, ngx_log_t *log) | |
442 { | |
443 ngx_fd_t fd; | |
444 ngx_file_info_t fi; | |
445 | |
446 of->fd = NGX_INVALID_FILE; | |
447 | |
448 if (of->test_dir) { | |
449 | |
450 if (ngx_file_info(name, &fi) == -1) { | |
451 of->err = ngx_errno; | |
452 | |
453 return NGX_ERROR; | |
454 } | |
455 | |
456 of->uniq = ngx_file_uniq(&fi); | |
457 of->mtime = ngx_file_mtime(&fi); | |
458 of->size = ngx_file_size(&fi); | |
459 of->is_dir = ngx_is_dir(&fi); | |
460 of->is_file = ngx_is_file(&fi); | |
461 of->is_link = ngx_is_link(&fi); | |
462 of->is_exec = ngx_is_exec(&fi); | |
463 | |
464 if (of->is_dir) { | |
465 return NGX_OK; | |
466 } | |
467 } | |
468 | |
469 fd = ngx_open_file(name, NGX_FILE_RDONLY, NGX_FILE_OPEN, 0); | |
470 | |
471 if (fd == NGX_INVALID_FILE) { | |
472 of->err = ngx_errno; | |
473 return NGX_ERROR; | |
474 } | |
475 | |
476 if (ngx_fd_info(fd, &fi) == NGX_FILE_ERROR) { | |
477 ngx_log_error(NGX_LOG_CRIT, log, ngx_errno, | |
478 ngx_fd_info_n " \"%s\" failed", name); | |
479 | |
480 if (ngx_close_file(fd) == NGX_FILE_ERROR) { | |
481 ngx_log_error(NGX_LOG_ALERT, log, ngx_errno, | |
482 ngx_close_file_n " \"%s\" failed", name); | |
483 } | |
484 | |
485 return NGX_ERROR; | |
486 } | |
487 | |
488 if (ngx_is_dir(&fi)) { | |
489 if (ngx_close_file(fd) == NGX_FILE_ERROR) { | |
490 ngx_log_error(NGX_LOG_ALERT, log, ngx_errno, | |
491 ngx_close_file_n " \"%s\" failed", name); | |
492 } | |
493 | |
494 fd = NGX_INVALID_FILE; | |
495 } | |
496 | |
497 of->fd = fd; | |
498 of->uniq = ngx_file_uniq(&fi); | |
499 of->mtime = ngx_file_mtime(&fi); | |
500 of->size = ngx_file_size(&fi); | |
501 of->is_dir = ngx_is_dir(&fi); | |
502 of->is_file = ngx_is_file(&fi); | |
503 of->is_link = ngx_is_link(&fi); | |
504 of->is_exec = ngx_is_exec(&fi); | |
505 | |
506 return NGX_OK; | |
507 } | |
508 | |
509 | |
1775 | 510 /* |
511 * we ignore any possible event setting error and | |
512 * fallback to usual periodic file retests | |
513 */ | |
514 | |
515 static void | |
516 ngx_open_file_add_event(ngx_open_file_cache_t *cache, | |
517 ngx_cached_open_file_t *file, ngx_open_file_info_t *of, ngx_log_t *log) | |
518 { | |
519 ngx_open_file_cache_event_t *fev; | |
520 | |
521 if (!(ngx_event_flags & NGX_USE_VNODE_EVENT) | |
522 || !of->events | |
523 || file->event | |
524 || of->fd == NGX_INVALID_FILE | |
525 || file->uses < of->min_uses) | |
526 { | |
527 return; | |
528 } | |
529 | |
530 file->event = ngx_calloc(sizeof(ngx_event_t), log); | |
531 if (file->event== NULL) { | |
532 return; | |
533 } | |
534 | |
535 fev = ngx_alloc(sizeof(ngx_open_file_cache_event_t), log); | |
536 if (fev == NULL) { | |
537 ngx_free(file->event); | |
538 file->event = NULL; | |
539 return; | |
540 } | |
541 | |
542 fev->fd = of->fd; | |
543 fev->file = file; | |
544 fev->cache = cache; | |
545 | |
546 file->event->handler = ngx_open_file_cache_remove; | |
547 file->event->data = fev; | |
548 | |
549 /* | |
550 * although vnode event may be called while ngx_cycle->poll | |
551 * destruction, however, cleanup procedures are run before any | |
552 * memory freeing and events will be canceled. | |
553 */ | |
554 | |
555 file->event->log = ngx_cycle->log; | |
556 | |
557 if (ngx_add_event(file->event, NGX_VNODE_EVENT, NGX_ONESHOT_EVENT) | |
558 != NGX_OK) | |
559 { | |
560 ngx_free(file->event->data); | |
561 ngx_free(file->event); | |
562 file->event = NULL; | |
563 return; | |
564 } | |
565 | |
566 /* | |
567 * we do not file->use_event here because there may be a race | |
568 * condition between opening file and adding event, so we rely | |
569 * upon event notification only after first file revalidation | |
570 */ | |
571 | |
572 return; | |
573 } | |
574 | |
575 | |
1453 | 576 static void |
577 ngx_open_file_cleanup(void *data) | |
578 { | |
579 ngx_open_file_cache_cleanup_t *c = data; | |
580 | |
581 c->file->count--; | |
582 | |
1772 | 583 ngx_close_cached_file(c->cache, c->file, c->min_uses, c->log); |
1453 | 584 |
585 /* drop one or two expired open files */ | |
586 ngx_expire_old_cached_files(c->cache, 1, c->log); | |
587 } | |
588 | |
589 | |
590 static void | |
591 ngx_close_cached_file(ngx_open_file_cache_t *cache, | |
1772 | 592 ngx_cached_open_file_t *file, ngx_uint_t min_uses, ngx_log_t *log) |
1453 | 593 { |
1772 | 594 ngx_log_debug5(NGX_LOG_DEBUG_CORE, log, 0, |
595 "close cached open file: %s, fd:%d, c:%d, u:%d, %d", | |
596 file->name, file->fd, file->count, file->uses, file->close); | |
1453 | 597 |
598 if (!file->close) { | |
599 | |
600 file->accessed = ngx_time(); | |
601 | |
1765 | 602 ngx_queue_remove(&file->queue); |
1453 | 603 |
1765 | 604 ngx_queue_insert_head(&cache->expire_queue, &file->queue); |
1453 | 605 |
1772 | 606 if (file->uses >= min_uses || file->count) { |
607 return; | |
608 } | |
1453 | 609 } |
610 | |
1775 | 611 ngx_open_file_del_event(file); |
1453 | 612 |
613 if (file->count) { | |
614 return; | |
615 } | |
616 | |
1772 | 617 if (file->fd != NGX_INVALID_FILE) { |
618 | |
619 if (ngx_close_file(file->fd) == NGX_FILE_ERROR) { | |
620 ngx_log_error(NGX_LOG_ALERT, log, ngx_errno, | |
621 ngx_close_file_n " \"%s\" failed", file->name); | |
622 } | |
623 | |
624 file->fd = NGX_INVALID_FILE; | |
625 } | |
626 | |
627 if (!file->close) { | |
628 return; | |
1453 | 629 } |
630 | |
631 ngx_free(file->name); | |
632 ngx_free(file); | |
633 } | |
634 | |
635 | |
636 static void | |
1775 | 637 ngx_open_file_del_event(ngx_cached_open_file_t *file) |
638 { | |
639 if (file->event == NULL) { | |
640 return; | |
641 } | |
642 | |
643 (void) ngx_del_event(file->event, NGX_VNODE_EVENT, | |
644 file->count ? NGX_FLUSH_EVENT : NGX_CLOSE_EVENT); | |
645 | |
646 ngx_free(file->event->data); | |
647 ngx_free(file->event); | |
648 file->event = NULL; | |
649 file->use_event = 0; | |
650 } | |
651 | |
652 | |
653 static void | |
1453 | 654 ngx_expire_old_cached_files(ngx_open_file_cache_t *cache, ngx_uint_t n, |
655 ngx_log_t *log) | |
656 { | |
657 time_t now; | |
1765 | 658 ngx_queue_t *q; |
1453 | 659 ngx_cached_open_file_t *file; |
660 | |
661 now = ngx_time(); | |
662 | |
663 /* | |
664 * n == 1 deletes one or two inactive files | |
665 * n == 0 deletes least recently used file by force | |
666 * and one or two inactive files | |
667 */ | |
668 | |
669 while (n < 3) { | |
670 | |
1765 | 671 if (ngx_queue_empty(&cache->expire_queue)) { |
1453 | 672 return; |
673 } | |
674 | |
1765 | 675 q = ngx_queue_last(&cache->expire_queue); |
676 | |
677 file = ngx_queue_data(q, ngx_cached_open_file_t, queue); | |
678 | |
1453 | 679 if (n++ != 0 && now - file->accessed <= cache->inactive) { |
680 return; | |
681 } | |
682 | |
1765 | 683 ngx_queue_remove(q); |
1453 | 684 |
685 ngx_rbtree_delete(&cache->rbtree, &file->node); | |
686 | |
687 cache->current--; | |
688 | |
689 ngx_log_debug1(NGX_LOG_DEBUG_CORE, log, 0, | |
690 "expire cached open file: %s", file->name); | |
691 | |
692 if (!file->err && !file->is_dir) { | |
693 file->close = 1; | |
1772 | 694 ngx_close_cached_file(cache, file, 0, log); |
1453 | 695 |
696 } else { | |
697 ngx_free(file->name); | |
698 ngx_free(file); | |
699 } | |
700 } | |
701 } | |
702 | |
703 | |
704 static void | |
705 ngx_open_file_cache_rbtree_insert_value(ngx_rbtree_node_t *temp, | |
706 ngx_rbtree_node_t *node, ngx_rbtree_node_t *sentinel) | |
707 { | |
708 ngx_rbtree_node_t **p; | |
709 ngx_cached_open_file_t *file, *file_temp; | |
710 | |
711 for ( ;; ) { | |
712 | |
713 if (node->key < temp->key) { | |
714 | |
715 p = &temp->left; | |
716 | |
717 } else if (node->key > temp->key) { | |
718 | |
719 p = &temp->right; | |
720 | |
721 } else { /* node->key == temp->key */ | |
722 | |
723 file = (ngx_cached_open_file_t *) node; | |
724 file_temp = (ngx_cached_open_file_t *) temp; | |
725 | |
726 p = (ngx_strcmp(file->name, file_temp->name) < 0) | |
727 ? &temp->left : &temp->right; | |
728 } | |
729 | |
730 if (*p == sentinel) { | |
731 break; | |
732 } | |
733 | |
734 temp = *p; | |
735 } | |
736 | |
737 *p = node; | |
738 node->parent = temp; | |
739 node->left = sentinel; | |
740 node->right = sentinel; | |
741 ngx_rbt_red(node); | |
742 } | |
743 | |
744 | |
1775 | 745 static ngx_cached_open_file_t * |
746 ngx_open_file_lookup(ngx_open_file_cache_t *cache, ngx_str_t *name, | |
747 uint32_t hash) | |
748 { | |
749 ngx_int_t rc; | |
750 ngx_rbtree_node_t *node, *sentinel; | |
751 ngx_cached_open_file_t *file; | |
752 | |
753 node = cache->rbtree.root; | |
754 sentinel = cache->rbtree.sentinel; | |
755 | |
756 while (node != sentinel) { | |
757 | |
758 if (hash < node->key) { | |
759 node = node->left; | |
760 continue; | |
761 } | |
762 | |
763 if (hash > node->key) { | |
764 node = node->right; | |
765 continue; | |
766 } | |
767 | |
768 /* hash == node->key */ | |
769 | |
770 do { | |
771 file = (ngx_cached_open_file_t *) node; | |
772 | |
773 rc = ngx_strcmp(name->data, file->name); | |
774 | |
775 if (rc == 0) { | |
776 return file; | |
777 } | |
778 | |
779 node = (rc < 0) ? node->left : node->right; | |
780 | |
781 } while (node != sentinel && hash == node->key); | |
782 | |
783 break; | |
784 } | |
785 | |
786 return NULL; | |
787 } | |
788 | |
789 | |
1453 | 790 static void |
791 ngx_open_file_cache_remove(ngx_event_t *ev) | |
792 { | |
793 ngx_cached_open_file_t *file; | |
794 ngx_open_file_cache_event_t *fev; | |
795 | |
796 fev = ev->data; | |
797 file = fev->file; | |
798 | |
1765 | 799 ngx_queue_remove(&file->queue); |
1453 | 800 |
801 ngx_rbtree_delete(&fev->cache->rbtree, &file->node); | |
802 | |
803 fev->cache->current--; | |
804 | |
805 /* NGX_ONESHOT_EVENT was already deleted */ | |
806 file->event = NULL; | |
807 | |
808 file->close = 1; | |
809 | |
1772 | 810 ngx_close_cached_file(fev->cache, file, 0, ev->log); |
1453 | 811 |
812 /* free memory only when fev->cache and fev->file are already not needed */ | |
813 | |
814 ngx_free(ev->data); | |
815 ngx_free(ev); | |
816 } |