Mercurial > hg > nginx-quic
annotate src/core/ngx_open_file_cache.c @ 2064:0835142149d2
refactor obscure code
author | Igor Sysoev <igor@sysoev.ru> |
---|---|
date | Wed, 25 Jun 2008 14:56:14 +0000 |
parents | 67a29af877ed |
children | 23930ccd2642 |
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 | |
1987 | 176 ngx_queue_remove(&file->queue); |
177 | |
1775 | 178 if (file->fd == NGX_INVALID_FILE && file->err == 0 && !file->is_dir) { |
179 | |
180 /* file was not used often enough to keep open */ | |
181 | |
182 rc = ngx_open_and_stat_file(name->data, of, pool->log); | |
1453 | 183 |
1775 | 184 if (rc != NGX_OK && (of->err == 0 || !of->errors)) { |
185 goto failed; | |
186 } | |
187 | |
188 goto add_event; | |
1453 | 189 } |
190 | |
1775 | 191 if ((file->event && file->use_event) |
2063
67a29af877ed
initialize of.uniq in ngx_open_cached_file()
Igor Sysoev <igor@sysoev.ru>
parents:
2006
diff
changeset
|
192 || (file->event == NULL |
67a29af877ed
initialize of.uniq in ngx_open_cached_file()
Igor Sysoev <igor@sysoev.ru>
parents:
2006
diff
changeset
|
193 && (of->uniq == 0 || of->uniq == file->uniq) |
67a29af877ed
initialize of.uniq in ngx_open_cached_file()
Igor Sysoev <igor@sysoev.ru>
parents:
2006
diff
changeset
|
194 && now - file->created < of->valid)) |
1775 | 195 { |
196 if (file->err == 0) { | |
1772 | 197 |
1775 | 198 of->fd = file->fd; |
199 of->uniq = file->uniq; | |
200 of->mtime = file->mtime; | |
201 of->size = file->size; | |
1453 | 202 |
1775 | 203 of->is_dir = file->is_dir; |
204 of->is_file = file->is_file; | |
205 of->is_link = file->is_link; | |
206 of->is_exec = file->is_exec; | |
1453 | 207 |
1775 | 208 if (!file->is_dir) { |
209 file->count++; | |
210 ngx_open_file_add_event(cache, file, of, pool->log); | |
1453 | 211 } |
212 | |
1775 | 213 } else { |
214 of->err = file->err; | |
215 } | |
216 | |
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 | |
241 if (of->is_dir) { | |
242 | |
243 if (file->is_dir || file->err) { | |
244 goto update; | |
245 } | |
246 | |
247 /* file became directory */ | |
1453 | 248 |
1775 | 249 } else if (of->err == 0) { /* file */ |
250 | |
251 if (file->is_dir || file->err) { | |
252 goto add_event; | |
253 } | |
1453 | 254 |
1775 | 255 if (of->uniq == file->uniq |
256 && of->mtime == file->mtime | |
257 && of->size == file->size) | |
258 { | |
259 if (ngx_close_file(of->fd) == NGX_FILE_ERROR) { | |
260 ngx_log_error(NGX_LOG_ALERT, pool->log, ngx_errno, | |
261 ngx_close_file_n " \"%s\" failed", | |
262 name->data); | |
1453 | 263 } |
264 | |
1775 | 265 of->fd = file->fd; |
266 file->count++; | |
1453 | 267 |
1775 | 268 if (file->event) { |
269 file->use_event = 1; | |
270 goto renew; | |
1453 | 271 } |
272 | |
1775 | 273 ngx_open_file_add_event(cache, file, of, pool->log); |
274 | |
275 goto renew; | |
276 } | |
1453 | 277 |
1775 | 278 /* file was changed */ |
1453 | 279 |
1775 | 280 } else { /* error to cache */ |
1453 | 281 |
1775 | 282 if (file->err || file->is_dir) { |
283 goto update; | |
1453 | 284 } |
285 | |
1775 | 286 /* file was removed, etc. */ |
287 } | |
288 | |
289 if (file->count == 0) { | |
290 | |
291 ngx_open_file_del_event(file); | |
1453 | 292 |
1775 | 293 if (ngx_close_file(file->fd) == NGX_FILE_ERROR) { |
294 ngx_log_error(NGX_LOG_ALERT, pool->log, ngx_errno, | |
295 ngx_close_file_n " \"%s\" failed", | |
296 name->data); | |
297 } | |
1453 | 298 |
1775 | 299 goto add_event; |
300 } | |
301 | |
302 ngx_rbtree_delete(&cache->rbtree, &file->node); | |
303 | |
304 cache->current--; | |
305 | |
306 file->close = 1; | |
307 | |
308 goto create; | |
1453 | 309 } |
310 | |
311 /* not found */ | |
312 | |
313 rc = ngx_open_and_stat_file(name->data, of, pool->log); | |
314 | |
315 if (rc != NGX_OK && (of->err == 0 || !of->errors)) { | |
316 goto failed; | |
317 } | |
318 | |
319 create: | |
320 | |
321 if (cache->current >= cache->max) { | |
322 ngx_expire_old_cached_files(cache, 0, pool->log); | |
323 } | |
324 | |
325 file = ngx_alloc(sizeof(ngx_cached_open_file_t), pool->log); | |
326 | |
327 if (file == NULL) { | |
328 goto failed; | |
329 } | |
330 | |
331 file->name = ngx_alloc(name->len + 1, pool->log); | |
332 | |
333 if (file->name == NULL) { | |
334 ngx_free(file); | |
335 file = NULL; | |
336 goto failed; | |
337 } | |
338 | |
339 ngx_cpystrn(file->name, name->data, name->len + 1); | |
340 | |
341 file->node.key = hash; | |
342 | |
343 ngx_rbtree_insert(&cache->rbtree, &file->node); | |
344 | |
345 cache->current++; | |
346 | |
1775 | 347 file->uses = 1; |
1453 | 348 file->count = 0; |
1775 | 349 file->use_event = 0; |
350 file->event = NULL; | |
351 | |
352 add_event: | |
353 | |
354 ngx_open_file_add_event(cache, file, of, pool->log); | |
1453 | 355 |
356 update: | |
357 | |
358 file->fd = of->fd; | |
359 file->err = of->err; | |
360 | |
361 if (of->err == 0) { | |
362 file->uniq = of->uniq; | |
363 file->mtime = of->mtime; | |
364 file->size = of->size; | |
365 | |
366 file->close = 0; | |
367 | |
368 file->is_dir = of->is_dir; | |
369 file->is_file = of->is_file; | |
370 file->is_link = of->is_link; | |
371 file->is_exec = of->is_exec; | |
372 | |
373 if (!of->is_dir) { | |
374 file->count++; | |
375 } | |
376 } | |
377 | |
378 renew: | |
379 | |
380 file->created = now; | |
381 | |
382 found: | |
383 | |
384 file->accessed = now; | |
385 | |
1765 | 386 ngx_queue_insert_head(&cache->expire_queue, &file->queue); |
1453 | 387 |
1772 | 388 ngx_log_debug5(NGX_LOG_DEBUG_CORE, pool->log, 0, |
389 "cached open file: %s, fd:%d, c:%d, e:%d, u:%d", | |
390 file->name, file->fd, file->count, file->err, file->uses); | |
1453 | 391 |
392 if (of->err == 0) { | |
393 | |
394 if (!of->is_dir) { | |
395 cln->handler = ngx_open_file_cleanup; | |
396 ofcln = cln->data; | |
397 | |
398 ofcln->cache = cache; | |
399 ofcln->file = file; | |
1772 | 400 ofcln->min_uses = of->min_uses; |
1453 | 401 ofcln->log = pool->log; |
402 } | |
403 | |
404 return NGX_OK; | |
405 } | |
406 | |
407 return NGX_ERROR; | |
408 | |
409 failed: | |
410 | |
1988
34051c712e41
fix segfault when file is deleted and open_file_cache_errors is off
Igor Sysoev <igor@sysoev.ru>
parents:
1987
diff
changeset
|
411 if (file) { |
1453 | 412 ngx_rbtree_delete(&cache->rbtree, &file->node); |
413 | |
414 cache->current--; | |
415 | |
1988
34051c712e41
fix segfault when file is deleted and open_file_cache_errors is off
Igor Sysoev <igor@sysoev.ru>
parents:
1987
diff
changeset
|
416 if (file->count == 0) { |
34051c712e41
fix segfault when file is deleted and open_file_cache_errors is off
Igor Sysoev <igor@sysoev.ru>
parents:
1987
diff
changeset
|
417 |
2006
b52cb9bf2064
style fix: remove tabs and trailing spaces
Igor Sysoev <igor@sysoev.ru>
parents:
1988
diff
changeset
|
418 if (file->fd != NGX_INVALID_FILE) { |
b52cb9bf2064
style fix: remove tabs and trailing spaces
Igor Sysoev <igor@sysoev.ru>
parents:
1988
diff
changeset
|
419 if (ngx_close_file(file->fd) == NGX_FILE_ERROR) { |
b52cb9bf2064
style fix: remove tabs and trailing spaces
Igor Sysoev <igor@sysoev.ru>
parents:
1988
diff
changeset
|
420 ngx_log_error(NGX_LOG_ALERT, pool->log, ngx_errno, |
b52cb9bf2064
style fix: remove tabs and trailing spaces
Igor Sysoev <igor@sysoev.ru>
parents:
1988
diff
changeset
|
421 ngx_close_file_n " \"%s\" failed", |
1988
34051c712e41
fix segfault when file is deleted and open_file_cache_errors is off
Igor Sysoev <igor@sysoev.ru>
parents:
1987
diff
changeset
|
422 file->name); |
2006
b52cb9bf2064
style fix: remove tabs and trailing spaces
Igor Sysoev <igor@sysoev.ru>
parents:
1988
diff
changeset
|
423 } |
b52cb9bf2064
style fix: remove tabs and trailing spaces
Igor Sysoev <igor@sysoev.ru>
parents:
1988
diff
changeset
|
424 } |
1988
34051c712e41
fix segfault when file is deleted and open_file_cache_errors is off
Igor Sysoev <igor@sysoev.ru>
parents:
1987
diff
changeset
|
425 |
34051c712e41
fix segfault when file is deleted and open_file_cache_errors is off
Igor Sysoev <igor@sysoev.ru>
parents:
1987
diff
changeset
|
426 ngx_free(file->name); |
34051c712e41
fix segfault when file is deleted and open_file_cache_errors is off
Igor Sysoev <igor@sysoev.ru>
parents:
1987
diff
changeset
|
427 ngx_free(file); |
34051c712e41
fix segfault when file is deleted and open_file_cache_errors is off
Igor Sysoev <igor@sysoev.ru>
parents:
1987
diff
changeset
|
428 |
34051c712e41
fix segfault when file is deleted and open_file_cache_errors is off
Igor Sysoev <igor@sysoev.ru>
parents:
1987
diff
changeset
|
429 } else { |
34051c712e41
fix segfault when file is deleted and open_file_cache_errors is off
Igor Sysoev <igor@sysoev.ru>
parents:
1987
diff
changeset
|
430 file->close = 1; |
1453 | 431 } |
432 } | |
433 | |
434 if (of->fd != NGX_INVALID_FILE) { | |
435 if (ngx_close_file(of->fd) == NGX_FILE_ERROR) { | |
436 ngx_log_error(NGX_LOG_ALERT, pool->log, ngx_errno, | |
437 ngx_close_file_n " \"%s\" failed", name->data); | |
438 } | |
439 } | |
440 | |
441 return NGX_ERROR; | |
442 } | |
443 | |
444 | |
445 static ngx_int_t | |
446 ngx_open_and_stat_file(u_char *name, ngx_open_file_info_t *of, ngx_log_t *log) | |
447 { | |
448 ngx_fd_t fd; | |
449 ngx_file_info_t fi; | |
450 | |
451 of->fd = NGX_INVALID_FILE; | |
452 | |
453 if (of->test_dir) { | |
454 | |
455 if (ngx_file_info(name, &fi) == -1) { | |
456 of->err = ngx_errno; | |
457 | |
458 return NGX_ERROR; | |
459 } | |
460 | |
461 of->uniq = ngx_file_uniq(&fi); | |
462 of->mtime = ngx_file_mtime(&fi); | |
463 of->size = ngx_file_size(&fi); | |
464 of->is_dir = ngx_is_dir(&fi); | |
465 of->is_file = ngx_is_file(&fi); | |
466 of->is_link = ngx_is_link(&fi); | |
467 of->is_exec = ngx_is_exec(&fi); | |
468 | |
469 if (of->is_dir) { | |
470 return NGX_OK; | |
471 } | |
472 } | |
473 | |
474 fd = ngx_open_file(name, NGX_FILE_RDONLY, NGX_FILE_OPEN, 0); | |
475 | |
476 if (fd == NGX_INVALID_FILE) { | |
477 of->err = ngx_errno; | |
478 return NGX_ERROR; | |
479 } | |
480 | |
481 if (ngx_fd_info(fd, &fi) == NGX_FILE_ERROR) { | |
482 ngx_log_error(NGX_LOG_CRIT, log, ngx_errno, | |
483 ngx_fd_info_n " \"%s\" failed", name); | |
484 | |
485 if (ngx_close_file(fd) == NGX_FILE_ERROR) { | |
486 ngx_log_error(NGX_LOG_ALERT, log, ngx_errno, | |
487 ngx_close_file_n " \"%s\" failed", name); | |
488 } | |
489 | |
490 return NGX_ERROR; | |
491 } | |
492 | |
493 if (ngx_is_dir(&fi)) { | |
494 if (ngx_close_file(fd) == NGX_FILE_ERROR) { | |
495 ngx_log_error(NGX_LOG_ALERT, log, ngx_errno, | |
496 ngx_close_file_n " \"%s\" failed", name); | |
497 } | |
498 | |
499 fd = NGX_INVALID_FILE; | |
500 } | |
501 | |
502 of->fd = fd; | |
503 of->uniq = ngx_file_uniq(&fi); | |
504 of->mtime = ngx_file_mtime(&fi); | |
505 of->size = ngx_file_size(&fi); | |
506 of->is_dir = ngx_is_dir(&fi); | |
507 of->is_file = ngx_is_file(&fi); | |
508 of->is_link = ngx_is_link(&fi); | |
509 of->is_exec = ngx_is_exec(&fi); | |
510 | |
511 return NGX_OK; | |
512 } | |
513 | |
514 | |
1775 | 515 /* |
516 * we ignore any possible event setting error and | |
517 * fallback to usual periodic file retests | |
518 */ | |
519 | |
520 static void | |
521 ngx_open_file_add_event(ngx_open_file_cache_t *cache, | |
522 ngx_cached_open_file_t *file, ngx_open_file_info_t *of, ngx_log_t *log) | |
523 { | |
524 ngx_open_file_cache_event_t *fev; | |
525 | |
526 if (!(ngx_event_flags & NGX_USE_VNODE_EVENT) | |
527 || !of->events | |
528 || file->event | |
529 || of->fd == NGX_INVALID_FILE | |
530 || file->uses < of->min_uses) | |
531 { | |
532 return; | |
533 } | |
534 | |
535 file->event = ngx_calloc(sizeof(ngx_event_t), log); | |
536 if (file->event== NULL) { | |
537 return; | |
538 } | |
539 | |
540 fev = ngx_alloc(sizeof(ngx_open_file_cache_event_t), log); | |
541 if (fev == NULL) { | |
542 ngx_free(file->event); | |
543 file->event = NULL; | |
544 return; | |
545 } | |
546 | |
547 fev->fd = of->fd; | |
548 fev->file = file; | |
549 fev->cache = cache; | |
550 | |
551 file->event->handler = ngx_open_file_cache_remove; | |
552 file->event->data = fev; | |
553 | |
554 /* | |
555 * although vnode event may be called while ngx_cycle->poll | |
556 * destruction, however, cleanup procedures are run before any | |
557 * memory freeing and events will be canceled. | |
558 */ | |
559 | |
560 file->event->log = ngx_cycle->log; | |
561 | |
562 if (ngx_add_event(file->event, NGX_VNODE_EVENT, NGX_ONESHOT_EVENT) | |
563 != NGX_OK) | |
564 { | |
565 ngx_free(file->event->data); | |
566 ngx_free(file->event); | |
567 file->event = NULL; | |
568 return; | |
569 } | |
570 | |
571 /* | |
572 * we do not file->use_event here because there may be a race | |
573 * condition between opening file and adding event, so we rely | |
574 * upon event notification only after first file revalidation | |
575 */ | |
576 | |
577 return; | |
578 } | |
579 | |
580 | |
1453 | 581 static void |
582 ngx_open_file_cleanup(void *data) | |
583 { | |
584 ngx_open_file_cache_cleanup_t *c = data; | |
585 | |
586 c->file->count--; | |
587 | |
1772 | 588 ngx_close_cached_file(c->cache, c->file, c->min_uses, c->log); |
1453 | 589 |
590 /* drop one or two expired open files */ | |
591 ngx_expire_old_cached_files(c->cache, 1, c->log); | |
592 } | |
593 | |
594 | |
595 static void | |
596 ngx_close_cached_file(ngx_open_file_cache_t *cache, | |
1772 | 597 ngx_cached_open_file_t *file, ngx_uint_t min_uses, ngx_log_t *log) |
1453 | 598 { |
1772 | 599 ngx_log_debug5(NGX_LOG_DEBUG_CORE, log, 0, |
600 "close cached open file: %s, fd:%d, c:%d, u:%d, %d", | |
601 file->name, file->fd, file->count, file->uses, file->close); | |
1453 | 602 |
603 if (!file->close) { | |
604 | |
605 file->accessed = ngx_time(); | |
606 | |
1765 | 607 ngx_queue_remove(&file->queue); |
1453 | 608 |
1765 | 609 ngx_queue_insert_head(&cache->expire_queue, &file->queue); |
1453 | 610 |
1772 | 611 if (file->uses >= min_uses || file->count) { |
612 return; | |
613 } | |
1453 | 614 } |
615 | |
1775 | 616 ngx_open_file_del_event(file); |
1453 | 617 |
618 if (file->count) { | |
619 return; | |
620 } | |
621 | |
1772 | 622 if (file->fd != NGX_INVALID_FILE) { |
623 | |
624 if (ngx_close_file(file->fd) == NGX_FILE_ERROR) { | |
625 ngx_log_error(NGX_LOG_ALERT, log, ngx_errno, | |
626 ngx_close_file_n " \"%s\" failed", file->name); | |
627 } | |
628 | |
629 file->fd = NGX_INVALID_FILE; | |
630 } | |
631 | |
632 if (!file->close) { | |
633 return; | |
1453 | 634 } |
635 | |
636 ngx_free(file->name); | |
637 ngx_free(file); | |
638 } | |
639 | |
640 | |
641 static void | |
1775 | 642 ngx_open_file_del_event(ngx_cached_open_file_t *file) |
643 { | |
644 if (file->event == NULL) { | |
645 return; | |
646 } | |
647 | |
648 (void) ngx_del_event(file->event, NGX_VNODE_EVENT, | |
649 file->count ? NGX_FLUSH_EVENT : NGX_CLOSE_EVENT); | |
650 | |
651 ngx_free(file->event->data); | |
652 ngx_free(file->event); | |
653 file->event = NULL; | |
654 file->use_event = 0; | |
655 } | |
656 | |
657 | |
658 static void | |
1453 | 659 ngx_expire_old_cached_files(ngx_open_file_cache_t *cache, ngx_uint_t n, |
660 ngx_log_t *log) | |
661 { | |
662 time_t now; | |
1765 | 663 ngx_queue_t *q; |
1453 | 664 ngx_cached_open_file_t *file; |
665 | |
666 now = ngx_time(); | |
667 | |
668 /* | |
669 * n == 1 deletes one or two inactive files | |
670 * n == 0 deletes least recently used file by force | |
671 * and one or two inactive files | |
672 */ | |
673 | |
674 while (n < 3) { | |
675 | |
1765 | 676 if (ngx_queue_empty(&cache->expire_queue)) { |
1453 | 677 return; |
678 } | |
679 | |
1765 | 680 q = ngx_queue_last(&cache->expire_queue); |
681 | |
682 file = ngx_queue_data(q, ngx_cached_open_file_t, queue); | |
683 | |
1453 | 684 if (n++ != 0 && now - file->accessed <= cache->inactive) { |
685 return; | |
686 } | |
687 | |
1765 | 688 ngx_queue_remove(q); |
1453 | 689 |
690 ngx_rbtree_delete(&cache->rbtree, &file->node); | |
691 | |
692 cache->current--; | |
693 | |
694 ngx_log_debug1(NGX_LOG_DEBUG_CORE, log, 0, | |
695 "expire cached open file: %s", file->name); | |
696 | |
697 if (!file->err && !file->is_dir) { | |
698 file->close = 1; | |
1772 | 699 ngx_close_cached_file(cache, file, 0, log); |
1453 | 700 |
701 } else { | |
702 ngx_free(file->name); | |
703 ngx_free(file); | |
704 } | |
705 } | |
706 } | |
707 | |
708 | |
709 static void | |
710 ngx_open_file_cache_rbtree_insert_value(ngx_rbtree_node_t *temp, | |
711 ngx_rbtree_node_t *node, ngx_rbtree_node_t *sentinel) | |
712 { | |
713 ngx_rbtree_node_t **p; | |
714 ngx_cached_open_file_t *file, *file_temp; | |
715 | |
716 for ( ;; ) { | |
717 | |
718 if (node->key < temp->key) { | |
719 | |
720 p = &temp->left; | |
721 | |
722 } else if (node->key > temp->key) { | |
723 | |
724 p = &temp->right; | |
725 | |
726 } else { /* node->key == temp->key */ | |
727 | |
728 file = (ngx_cached_open_file_t *) node; | |
729 file_temp = (ngx_cached_open_file_t *) temp; | |
730 | |
731 p = (ngx_strcmp(file->name, file_temp->name) < 0) | |
732 ? &temp->left : &temp->right; | |
733 } | |
734 | |
735 if (*p == sentinel) { | |
736 break; | |
737 } | |
738 | |
739 temp = *p; | |
740 } | |
741 | |
742 *p = node; | |
743 node->parent = temp; | |
744 node->left = sentinel; | |
745 node->right = sentinel; | |
746 ngx_rbt_red(node); | |
747 } | |
748 | |
749 | |
1775 | 750 static ngx_cached_open_file_t * |
751 ngx_open_file_lookup(ngx_open_file_cache_t *cache, ngx_str_t *name, | |
752 uint32_t hash) | |
753 { | |
754 ngx_int_t rc; | |
755 ngx_rbtree_node_t *node, *sentinel; | |
756 ngx_cached_open_file_t *file; | |
757 | |
758 node = cache->rbtree.root; | |
759 sentinel = cache->rbtree.sentinel; | |
760 | |
761 while (node != sentinel) { | |
762 | |
763 if (hash < node->key) { | |
764 node = node->left; | |
765 continue; | |
766 } | |
767 | |
768 if (hash > node->key) { | |
769 node = node->right; | |
770 continue; | |
771 } | |
772 | |
773 /* hash == node->key */ | |
774 | |
775 do { | |
776 file = (ngx_cached_open_file_t *) node; | |
777 | |
778 rc = ngx_strcmp(name->data, file->name); | |
779 | |
780 if (rc == 0) { | |
781 return file; | |
782 } | |
783 | |
784 node = (rc < 0) ? node->left : node->right; | |
785 | |
786 } while (node != sentinel && hash == node->key); | |
787 | |
788 break; | |
789 } | |
790 | |
791 return NULL; | |
792 } | |
793 | |
794 | |
1453 | 795 static void |
796 ngx_open_file_cache_remove(ngx_event_t *ev) | |
797 { | |
798 ngx_cached_open_file_t *file; | |
799 ngx_open_file_cache_event_t *fev; | |
800 | |
801 fev = ev->data; | |
802 file = fev->file; | |
803 | |
1765 | 804 ngx_queue_remove(&file->queue); |
1453 | 805 |
806 ngx_rbtree_delete(&fev->cache->rbtree, &file->node); | |
807 | |
808 fev->cache->current--; | |
809 | |
810 /* NGX_ONESHOT_EVENT was already deleted */ | |
811 file->event = NULL; | |
812 | |
813 file->close = 1; | |
814 | |
1772 | 815 ngx_close_cached_file(fev->cache, file, 0, ev->log); |
1453 | 816 |
817 /* free memory only when fev->cache and fev->file are already not needed */ | |
818 | |
819 ngx_free(ev->data); | |
820 ngx_free(ev); | |
821 } |