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1.1 misho 1:
2: /*
3: * Copyright (C) Igor Sysoev
4: * Copyright (C) Nginx, Inc.
5: */
6:
7:
8: #include <ngx_config.h>
9: #include <ngx_core.h>
10: #include <ngx_event.h>
11:
12:
13: /*
14: * open file cache caches
15: * open file handles with stat() info;
16: * directories stat() info;
17: * files and directories errors: not found, access denied, etc.
18: */
19:
20:
21: #define NGX_MIN_READ_AHEAD (128 * 1024)
22:
23:
24: static void ngx_open_file_cache_cleanup(void *data);
25: #if (NGX_HAVE_OPENAT)
26: static ngx_fd_t ngx_openat_file_owner(ngx_fd_t at_fd, const u_char *name,
27: ngx_int_t mode, ngx_int_t create, ngx_int_t access, ngx_log_t *log);
28: #endif
29: static ngx_fd_t ngx_open_file_wrapper(ngx_str_t *name,
30: ngx_open_file_info_t *of, ngx_int_t mode, ngx_int_t create,
31: ngx_int_t access, ngx_log_t *log);
32: static ngx_int_t ngx_file_info_wrapper(ngx_str_t *name,
33: ngx_open_file_info_t *of, ngx_file_info_t *fi, ngx_log_t *log);
34: static ngx_int_t ngx_open_and_stat_file(ngx_str_t *name,
35: ngx_open_file_info_t *of, ngx_log_t *log);
36: static void ngx_open_file_add_event(ngx_open_file_cache_t *cache,
37: ngx_cached_open_file_t *file, ngx_open_file_info_t *of, ngx_log_t *log);
38: static void ngx_open_file_cleanup(void *data);
39: static void ngx_close_cached_file(ngx_open_file_cache_t *cache,
40: ngx_cached_open_file_t *file, ngx_uint_t min_uses, ngx_log_t *log);
41: static void ngx_open_file_del_event(ngx_cached_open_file_t *file);
42: static void ngx_expire_old_cached_files(ngx_open_file_cache_t *cache,
43: ngx_uint_t n, ngx_log_t *log);
44: static void ngx_open_file_cache_rbtree_insert_value(ngx_rbtree_node_t *temp,
45: ngx_rbtree_node_t *node, ngx_rbtree_node_t *sentinel);
46: static ngx_cached_open_file_t *
47: ngx_open_file_lookup(ngx_open_file_cache_t *cache, ngx_str_t *name,
48: uint32_t hash);
49: static void ngx_open_file_cache_remove(ngx_event_t *ev);
50:
51:
52: ngx_open_file_cache_t *
53: ngx_open_file_cache_init(ngx_pool_t *pool, ngx_uint_t max, time_t inactive)
54: {
55: ngx_pool_cleanup_t *cln;
56: ngx_open_file_cache_t *cache;
57:
58: cache = ngx_palloc(pool, sizeof(ngx_open_file_cache_t));
59: if (cache == NULL) {
60: return NULL;
61: }
62:
63: ngx_rbtree_init(&cache->rbtree, &cache->sentinel,
64: ngx_open_file_cache_rbtree_insert_value);
65:
66: ngx_queue_init(&cache->expire_queue);
67:
68: cache->current = 0;
69: cache->max = max;
70: cache->inactive = inactive;
71:
72: cln = ngx_pool_cleanup_add(pool, 0);
73: if (cln == NULL) {
74: return NULL;
75: }
76:
77: cln->handler = ngx_open_file_cache_cleanup;
78: cln->data = cache;
79:
80: return cache;
81: }
82:
83:
84: static void
85: ngx_open_file_cache_cleanup(void *data)
86: {
87: ngx_open_file_cache_t *cache = data;
88:
89: ngx_queue_t *q;
90: ngx_cached_open_file_t *file;
91:
92: ngx_log_debug0(NGX_LOG_DEBUG_CORE, ngx_cycle->log, 0,
93: "open file cache cleanup");
94:
95: for ( ;; ) {
96:
97: if (ngx_queue_empty(&cache->expire_queue)) {
98: break;
99: }
100:
101: q = ngx_queue_last(&cache->expire_queue);
102:
103: file = ngx_queue_data(q, ngx_cached_open_file_t, queue);
104:
105: ngx_queue_remove(q);
106:
107: ngx_rbtree_delete(&cache->rbtree, &file->node);
108:
109: cache->current--;
110:
111: ngx_log_debug1(NGX_LOG_DEBUG_CORE, ngx_cycle->log, 0,
112: "delete cached open file: %s", file->name);
113:
114: if (!file->err && !file->is_dir) {
115: file->close = 1;
116: file->count = 0;
117: ngx_close_cached_file(cache, file, 0, ngx_cycle->log);
118:
119: } else {
120: ngx_free(file->name);
121: ngx_free(file);
122: }
123: }
124:
125: if (cache->current) {
126: ngx_log_error(NGX_LOG_ALERT, ngx_cycle->log, 0,
127: "%d items still leave in open file cache",
128: cache->current);
129: }
130:
131: if (cache->rbtree.root != cache->rbtree.sentinel) {
132: ngx_log_error(NGX_LOG_ALERT, ngx_cycle->log, 0,
133: "rbtree still is not empty in open file cache");
134:
135: }
136: }
137:
138:
139: ngx_int_t
140: ngx_open_cached_file(ngx_open_file_cache_t *cache, ngx_str_t *name,
141: ngx_open_file_info_t *of, ngx_pool_t *pool)
142: {
143: time_t now;
144: uint32_t hash;
145: ngx_int_t rc;
146: ngx_file_info_t fi;
147: ngx_pool_cleanup_t *cln;
148: ngx_cached_open_file_t *file;
149: ngx_pool_cleanup_file_t *clnf;
150: ngx_open_file_cache_cleanup_t *ofcln;
151:
152: of->fd = NGX_INVALID_FILE;
153: of->err = 0;
154:
155: if (cache == NULL) {
156:
157: if (of->test_only) {
158:
159: if (ngx_file_info_wrapper(name, of, &fi, pool->log)
160: == NGX_FILE_ERROR)
161: {
162: return NGX_ERROR;
163: }
164:
165: of->uniq = ngx_file_uniq(&fi);
166: of->mtime = ngx_file_mtime(&fi);
167: of->size = ngx_file_size(&fi);
168: of->fs_size = ngx_file_fs_size(&fi);
169: of->is_dir = ngx_is_dir(&fi);
170: of->is_file = ngx_is_file(&fi);
171: of->is_link = ngx_is_link(&fi);
172: of->is_exec = ngx_is_exec(&fi);
173:
174: return NGX_OK;
175: }
176:
177: cln = ngx_pool_cleanup_add(pool, sizeof(ngx_pool_cleanup_file_t));
178: if (cln == NULL) {
179: return NGX_ERROR;
180: }
181:
182: rc = ngx_open_and_stat_file(name, of, pool->log);
183:
184: if (rc == NGX_OK && !of->is_dir) {
185: cln->handler = ngx_pool_cleanup_file;
186: clnf = cln->data;
187:
188: clnf->fd = of->fd;
189: clnf->name = name->data;
190: clnf->log = pool->log;
191: }
192:
193: return rc;
194: }
195:
196: cln = ngx_pool_cleanup_add(pool, sizeof(ngx_open_file_cache_cleanup_t));
197: if (cln == NULL) {
198: return NGX_ERROR;
199: }
200:
201: now = ngx_time();
202:
203: hash = ngx_crc32_long(name->data, name->len);
204:
205: file = ngx_open_file_lookup(cache, name, hash);
206:
207: if (file) {
208:
209: file->uses++;
210:
211: ngx_queue_remove(&file->queue);
212:
213: if (file->fd == NGX_INVALID_FILE && file->err == 0 && !file->is_dir) {
214:
215: /* file was not used often enough to keep open */
216:
217: rc = ngx_open_and_stat_file(name, of, pool->log);
218:
219: if (rc != NGX_OK && (of->err == 0 || !of->errors)) {
220: goto failed;
221: }
222:
223: goto add_event;
224: }
225:
226: if (file->use_event
227: || (file->event == NULL
228: && (of->uniq == 0 || of->uniq == file->uniq)
229: && now - file->created < of->valid
230: #if (NGX_HAVE_OPENAT)
231: && of->disable_symlinks == file->disable_symlinks
232: && of->disable_symlinks_from == file->disable_symlinks_from
233: #endif
234: ))
235: {
236: if (file->err == 0) {
237:
238: of->fd = file->fd;
239: of->uniq = file->uniq;
240: of->mtime = file->mtime;
241: of->size = file->size;
242:
243: of->is_dir = file->is_dir;
244: of->is_file = file->is_file;
245: of->is_link = file->is_link;
246: of->is_exec = file->is_exec;
247: of->is_directio = file->is_directio;
248:
249: if (!file->is_dir) {
250: file->count++;
251: ngx_open_file_add_event(cache, file, of, pool->log);
252: }
253:
254: } else {
255: of->err = file->err;
256: #if (NGX_HAVE_OPENAT)
257: of->failed = file->disable_symlinks ? ngx_openat_file_n
258: : ngx_open_file_n;
259: #else
260: of->failed = ngx_open_file_n;
261: #endif
262: }
263:
264: goto found;
265: }
266:
267: ngx_log_debug4(NGX_LOG_DEBUG_CORE, pool->log, 0,
268: "retest open file: %s, fd:%d, c:%d, e:%d",
269: file->name, file->fd, file->count, file->err);
270:
271: if (file->is_dir) {
272:
273: /*
274: * chances that directory became file are very small
275: * so test_dir flag allows to use a single syscall
276: * in ngx_file_info() instead of three syscalls
277: */
278:
279: of->test_dir = 1;
280: }
281:
282: of->fd = file->fd;
283: of->uniq = file->uniq;
284:
285: rc = ngx_open_and_stat_file(name, of, pool->log);
286:
287: if (rc != NGX_OK && (of->err == 0 || !of->errors)) {
288: goto failed;
289: }
290:
291: if (of->is_dir) {
292:
293: if (file->is_dir || file->err) {
294: goto update;
295: }
296:
297: /* file became directory */
298:
299: } else if (of->err == 0) { /* file */
300:
301: if (file->is_dir || file->err) {
302: goto add_event;
303: }
304:
305: if (of->uniq == file->uniq) {
306:
307: if (file->event) {
308: file->use_event = 1;
309: }
310:
311: of->is_directio = file->is_directio;
312:
313: goto update;
314: }
315:
316: /* file was changed */
317:
318: } else { /* error to cache */
319:
320: if (file->err || file->is_dir) {
321: goto update;
322: }
323:
324: /* file was removed, etc. */
325: }
326:
327: if (file->count == 0) {
328:
329: ngx_open_file_del_event(file);
330:
331: if (ngx_close_file(file->fd) == NGX_FILE_ERROR) {
332: ngx_log_error(NGX_LOG_ALERT, pool->log, ngx_errno,
333: ngx_close_file_n " \"%V\" failed", name);
334: }
335:
336: goto add_event;
337: }
338:
339: ngx_rbtree_delete(&cache->rbtree, &file->node);
340:
341: cache->current--;
342:
343: file->close = 1;
344:
345: goto create;
346: }
347:
348: /* not found */
349:
350: rc = ngx_open_and_stat_file(name, of, pool->log);
351:
352: if (rc != NGX_OK && (of->err == 0 || !of->errors)) {
353: goto failed;
354: }
355:
356: create:
357:
358: if (cache->current >= cache->max) {
359: ngx_expire_old_cached_files(cache, 0, pool->log);
360: }
361:
362: file = ngx_alloc(sizeof(ngx_cached_open_file_t), pool->log);
363:
364: if (file == NULL) {
365: goto failed;
366: }
367:
368: file->name = ngx_alloc(name->len + 1, pool->log);
369:
370: if (file->name == NULL) {
371: ngx_free(file);
372: file = NULL;
373: goto failed;
374: }
375:
376: ngx_cpystrn(file->name, name->data, name->len + 1);
377:
378: file->node.key = hash;
379:
380: ngx_rbtree_insert(&cache->rbtree, &file->node);
381:
382: cache->current++;
383:
384: file->uses = 1;
385: file->count = 0;
386: file->use_event = 0;
387: file->event = NULL;
388:
389: add_event:
390:
391: ngx_open_file_add_event(cache, file, of, pool->log);
392:
393: update:
394:
395: file->fd = of->fd;
396: file->err = of->err;
397: #if (NGX_HAVE_OPENAT)
398: file->disable_symlinks = of->disable_symlinks;
399: file->disable_symlinks_from = of->disable_symlinks_from;
400: #endif
401:
402: if (of->err == 0) {
403: file->uniq = of->uniq;
404: file->mtime = of->mtime;
405: file->size = of->size;
406:
407: file->close = 0;
408:
409: file->is_dir = of->is_dir;
410: file->is_file = of->is_file;
411: file->is_link = of->is_link;
412: file->is_exec = of->is_exec;
413: file->is_directio = of->is_directio;
414:
415: if (!of->is_dir) {
416: file->count++;
417: }
418: }
419:
420: file->created = now;
421:
422: found:
423:
424: file->accessed = now;
425:
426: ngx_queue_insert_head(&cache->expire_queue, &file->queue);
427:
428: ngx_log_debug5(NGX_LOG_DEBUG_CORE, pool->log, 0,
429: "cached open file: %s, fd:%d, c:%d, e:%d, u:%d",
430: file->name, file->fd, file->count, file->err, file->uses);
431:
432: if (of->err == 0) {
433:
434: if (!of->is_dir) {
435: cln->handler = ngx_open_file_cleanup;
436: ofcln = cln->data;
437:
438: ofcln->cache = cache;
439: ofcln->file = file;
440: ofcln->min_uses = of->min_uses;
441: ofcln->log = pool->log;
442: }
443:
444: return NGX_OK;
445: }
446:
447: return NGX_ERROR;
448:
449: failed:
450:
451: if (file) {
452: ngx_rbtree_delete(&cache->rbtree, &file->node);
453:
454: cache->current--;
455:
456: if (file->count == 0) {
457:
458: if (file->fd != NGX_INVALID_FILE) {
459: if (ngx_close_file(file->fd) == NGX_FILE_ERROR) {
460: ngx_log_error(NGX_LOG_ALERT, pool->log, ngx_errno,
461: ngx_close_file_n " \"%s\" failed",
462: file->name);
463: }
464: }
465:
466: ngx_free(file->name);
467: ngx_free(file);
468:
469: } else {
470: file->close = 1;
471: }
472: }
473:
474: if (of->fd != NGX_INVALID_FILE) {
475: if (ngx_close_file(of->fd) == NGX_FILE_ERROR) {
476: ngx_log_error(NGX_LOG_ALERT, pool->log, ngx_errno,
477: ngx_close_file_n " \"%V\" failed", name);
478: }
479: }
480:
481: return NGX_ERROR;
482: }
483:
484:
485: #if (NGX_HAVE_OPENAT)
486:
487: static ngx_fd_t
488: ngx_openat_file_owner(ngx_fd_t at_fd, const u_char *name,
489: ngx_int_t mode, ngx_int_t create, ngx_int_t access, ngx_log_t *log)
490: {
491: ngx_fd_t fd;
492: ngx_err_t err;
493: ngx_file_info_t fi, atfi;
494:
495: /*
496: * To allow symlinks with the same owner, use openat() (followed
497: * by fstat()) and fstatat(AT_SYMLINK_NOFOLLOW), and then compare
498: * uids between fstat() and fstatat().
499: *
500: * As there is a race between openat() and fstatat() we don't
501: * know if openat() in fact opened symlink or not. Therefore,
502: * we have to compare uids even if fstatat() reports the opened
503: * component isn't a symlink (as we don't know whether it was
504: * symlink during openat() or not).
505: */
506:
507: fd = ngx_openat_file(at_fd, name, mode, create, access);
508:
509: if (fd == NGX_INVALID_FILE) {
510: return NGX_INVALID_FILE;
511: }
512:
513: if (ngx_file_at_info(at_fd, name, &atfi, AT_SYMLINK_NOFOLLOW)
514: == NGX_FILE_ERROR)
515: {
516: err = ngx_errno;
517: goto failed;
518: }
519:
520: if (ngx_fd_info(fd, &fi) == NGX_FILE_ERROR) {
521: err = ngx_errno;
522: goto failed;
523: }
524:
525: if (fi.st_uid != atfi.st_uid) {
526: err = NGX_ELOOP;
527: goto failed;
528: }
529:
530: return fd;
531:
532: failed:
533:
534: if (ngx_close_file(fd) == NGX_FILE_ERROR) {
535: ngx_log_error(NGX_LOG_ALERT, log, ngx_errno,
536: ngx_close_file_n " \"%V\" failed", name);
537: }
538:
539: ngx_set_errno(err);
540:
541: return NGX_INVALID_FILE;
542: }
543:
544: #endif
545:
546:
547: static ngx_fd_t
548: ngx_open_file_wrapper(ngx_str_t *name, ngx_open_file_info_t *of,
549: ngx_int_t mode, ngx_int_t create, ngx_int_t access, ngx_log_t *log)
550: {
551: ngx_fd_t fd;
552:
553: #if !(NGX_HAVE_OPENAT)
554:
555: fd = ngx_open_file(name->data, mode, create, access);
556:
557: if (fd == NGX_INVALID_FILE) {
558: of->err = ngx_errno;
559: of->failed = ngx_open_file_n;
560: return NGX_INVALID_FILE;
561: }
562:
563: return fd;
564:
565: #else
566:
567: u_char *p, *cp, *end;
568: ngx_fd_t at_fd;
569: ngx_str_t at_name;
570:
571: if (of->disable_symlinks == NGX_DISABLE_SYMLINKS_OFF) {
572: fd = ngx_open_file(name->data, mode, create, access);
573:
574: if (fd == NGX_INVALID_FILE) {
575: of->err = ngx_errno;
576: of->failed = ngx_open_file_n;
577: return NGX_INVALID_FILE;
578: }
579:
580: return fd;
581: }
582:
583: p = name->data;
584: end = p + name->len;
585:
586: at_name = *name;
587:
588: if (of->disable_symlinks_from) {
589:
590: cp = p + of->disable_symlinks_from;
591:
592: *cp = '\0';
593:
594: at_fd = ngx_open_file(p, NGX_FILE_SEARCH|NGX_FILE_NONBLOCK,
595: NGX_FILE_OPEN, 0);
596:
597: *cp = '/';
598:
599: if (at_fd == NGX_INVALID_FILE) {
600: of->err = ngx_errno;
601: of->failed = ngx_open_file_n;
602: return NGX_INVALID_FILE;
603: }
604:
605: at_name.len = of->disable_symlinks_from;
606: p = cp + 1;
607:
608: } else if (*p == '/') {
609:
610: at_fd = ngx_open_file("/",
611: NGX_FILE_SEARCH|NGX_FILE_NONBLOCK,
612: NGX_FILE_OPEN, 0);
613:
614: if (at_fd == NGX_INVALID_FILE) {
615: of->err = ngx_errno;
616: of->failed = ngx_openat_file_n;
617: return NGX_INVALID_FILE;
618: }
619:
620: at_name.len = 1;
621: p++;
622:
623: } else {
624: at_fd = NGX_AT_FDCWD;
625: }
626:
627: for ( ;; ) {
628: cp = ngx_strlchr(p, end, '/');
629: if (cp == NULL) {
630: break;
631: }
632:
633: if (cp == p) {
634: p++;
635: continue;
636: }
637:
638: *cp = '\0';
639:
640: if (of->disable_symlinks == NGX_DISABLE_SYMLINKS_NOTOWNER) {
641: fd = ngx_openat_file_owner(at_fd, p,
642: NGX_FILE_SEARCH|NGX_FILE_NONBLOCK,
643: NGX_FILE_OPEN, 0, log);
644:
645: } else {
646: fd = ngx_openat_file(at_fd, p,
647: NGX_FILE_SEARCH|NGX_FILE_NONBLOCK|NGX_FILE_NOFOLLOW,
648: NGX_FILE_OPEN, 0);
649: }
650:
651: *cp = '/';
652:
653: if (fd == NGX_INVALID_FILE) {
654: of->err = ngx_errno;
655: of->failed = ngx_openat_file_n;
656: goto failed;
657: }
658:
659: if (at_fd != NGX_AT_FDCWD && ngx_close_file(at_fd) == NGX_FILE_ERROR) {
660: ngx_log_error(NGX_LOG_ALERT, log, ngx_errno,
661: ngx_close_file_n " \"%V\" failed", &at_name);
662: }
663:
664: p = cp + 1;
665: at_fd = fd;
666: at_name.len = cp - at_name.data;
667: }
668:
669: if (p == end) {
670:
671: /*
672: * If pathname ends with a trailing slash, assume the last path
673: * component is a directory and reopen it with requested flags;
674: * if not, fail with ENOTDIR as per POSIX.
675: *
676: * We cannot rely on O_DIRECTORY in the loop above to check
677: * that the last path component is a directory because
678: * O_DIRECTORY doesn't work on FreeBSD 8. Fortunately, by
679: * reopening a directory, we don't depend on it at all.
680: */
681:
682: fd = ngx_openat_file(at_fd, ".", mode, create, access);
683: goto done;
684: }
685:
686: if (of->disable_symlinks == NGX_DISABLE_SYMLINKS_NOTOWNER
687: && !(create & (NGX_FILE_CREATE_OR_OPEN|NGX_FILE_TRUNCATE)))
688: {
689: fd = ngx_openat_file_owner(at_fd, p, mode, create, access, log);
690:
691: } else {
692: fd = ngx_openat_file(at_fd, p, mode|NGX_FILE_NOFOLLOW, create, access);
693: }
694:
695: done:
696:
697: if (fd == NGX_INVALID_FILE) {
698: of->err = ngx_errno;
699: of->failed = ngx_openat_file_n;
700: }
701:
702: failed:
703:
704: if (at_fd != NGX_AT_FDCWD && ngx_close_file(at_fd) == NGX_FILE_ERROR) {
705: ngx_log_error(NGX_LOG_ALERT, log, ngx_errno,
706: ngx_close_file_n " \"%V\" failed", &at_name);
707: }
708:
709: return fd;
710: #endif
711: }
712:
713:
714: static ngx_int_t
715: ngx_file_info_wrapper(ngx_str_t *name, ngx_open_file_info_t *of,
716: ngx_file_info_t *fi, ngx_log_t *log)
717: {
718: ngx_int_t rc;
719:
720: #if !(NGX_HAVE_OPENAT)
721:
722: rc = ngx_file_info(name->data, fi);
723:
724: if (rc == NGX_FILE_ERROR) {
725: of->err = ngx_errno;
726: of->failed = ngx_file_info_n;
727: return NGX_FILE_ERROR;
728: }
729:
730: return rc;
731:
732: #else
733:
734: ngx_fd_t fd;
735:
736: if (of->disable_symlinks == NGX_DISABLE_SYMLINKS_OFF) {
737:
738: rc = ngx_file_info(name->data, fi);
739:
740: if (rc == NGX_FILE_ERROR) {
741: of->err = ngx_errno;
742: of->failed = ngx_file_info_n;
743: return NGX_FILE_ERROR;
744: }
745:
746: return rc;
747: }
748:
749: fd = ngx_open_file_wrapper(name, of, NGX_FILE_RDONLY|NGX_FILE_NONBLOCK,
750: NGX_FILE_OPEN, 0, log);
751:
752: if (fd == NGX_INVALID_FILE) {
753: return NGX_FILE_ERROR;
754: }
755:
756: rc = ngx_fd_info(fd, fi);
757:
758: if (rc == NGX_FILE_ERROR) {
759: of->err = ngx_errno;
760: of->failed = ngx_fd_info_n;
761: }
762:
763: if (ngx_close_file(fd) == NGX_FILE_ERROR) {
764: ngx_log_error(NGX_LOG_ALERT, log, ngx_errno,
765: ngx_close_file_n " \"%V\" failed", name);
766: }
767:
768: return rc;
769: #endif
770: }
771:
772:
773: static ngx_int_t
774: ngx_open_and_stat_file(ngx_str_t *name, ngx_open_file_info_t *of,
775: ngx_log_t *log)
776: {
777: ngx_fd_t fd;
778: ngx_file_info_t fi;
779:
780: if (of->fd != NGX_INVALID_FILE) {
781:
782: if (ngx_file_info_wrapper(name, of, &fi, log) == NGX_FILE_ERROR) {
783: of->fd = NGX_INVALID_FILE;
784: return NGX_ERROR;
785: }
786:
787: if (of->uniq == ngx_file_uniq(&fi)) {
788: goto done;
789: }
790:
791: } else if (of->test_dir) {
792:
793: if (ngx_file_info_wrapper(name, of, &fi, log) == NGX_FILE_ERROR) {
794: of->fd = NGX_INVALID_FILE;
795: return NGX_ERROR;
796: }
797:
798: if (ngx_is_dir(&fi)) {
799: goto done;
800: }
801: }
802:
803: if (!of->log) {
804:
805: /*
806: * Use non-blocking open() not to hang on FIFO files, etc.
807: * This flag has no effect on a regular files.
808: */
809:
810: fd = ngx_open_file_wrapper(name, of, NGX_FILE_RDONLY|NGX_FILE_NONBLOCK,
811: NGX_FILE_OPEN, 0, log);
812:
813: } else {
814: fd = ngx_open_file_wrapper(name, of, NGX_FILE_APPEND,
815: NGX_FILE_CREATE_OR_OPEN,
816: NGX_FILE_DEFAULT_ACCESS, log);
817: }
818:
819: if (fd == NGX_INVALID_FILE) {
820: of->fd = NGX_INVALID_FILE;
821: return NGX_ERROR;
822: }
823:
824: if (ngx_fd_info(fd, &fi) == NGX_FILE_ERROR) {
825: ngx_log_error(NGX_LOG_CRIT, log, ngx_errno,
826: ngx_fd_info_n " \"%V\" failed", name);
827:
828: if (ngx_close_file(fd) == NGX_FILE_ERROR) {
829: ngx_log_error(NGX_LOG_ALERT, log, ngx_errno,
830: ngx_close_file_n " \"%V\" failed", name);
831: }
832:
833: of->fd = NGX_INVALID_FILE;
834:
835: return NGX_ERROR;
836: }
837:
838: if (ngx_is_dir(&fi)) {
839: if (ngx_close_file(fd) == NGX_FILE_ERROR) {
840: ngx_log_error(NGX_LOG_ALERT, log, ngx_errno,
841: ngx_close_file_n " \"%V\" failed", name);
842: }
843:
844: of->fd = NGX_INVALID_FILE;
845:
846: } else {
847: of->fd = fd;
848:
849: if (of->read_ahead && ngx_file_size(&fi) > NGX_MIN_READ_AHEAD) {
850: if (ngx_read_ahead(fd, of->read_ahead) == NGX_ERROR) {
851: ngx_log_error(NGX_LOG_ALERT, log, ngx_errno,
852: ngx_read_ahead_n " \"%V\" failed", name);
853: }
854: }
855:
856: if (of->directio <= ngx_file_size(&fi)) {
857: if (ngx_directio_on(fd) == NGX_FILE_ERROR) {
858: ngx_log_error(NGX_LOG_ALERT, log, ngx_errno,
859: ngx_directio_on_n " \"%V\" failed", name);
860:
861: } else {
862: of->is_directio = 1;
863: }
864: }
865: }
866:
867: done:
868:
869: of->uniq = ngx_file_uniq(&fi);
870: of->mtime = ngx_file_mtime(&fi);
871: of->size = ngx_file_size(&fi);
872: of->fs_size = ngx_file_fs_size(&fi);
873: of->is_dir = ngx_is_dir(&fi);
874: of->is_file = ngx_is_file(&fi);
875: of->is_link = ngx_is_link(&fi);
876: of->is_exec = ngx_is_exec(&fi);
877:
878: return NGX_OK;
879: }
880:
881:
882: /*
883: * we ignore any possible event setting error and
884: * fallback to usual periodic file retests
885: */
886:
887: static void
888: ngx_open_file_add_event(ngx_open_file_cache_t *cache,
889: ngx_cached_open_file_t *file, ngx_open_file_info_t *of, ngx_log_t *log)
890: {
891: ngx_open_file_cache_event_t *fev;
892:
893: if (!(ngx_event_flags & NGX_USE_VNODE_EVENT)
894: || !of->events
895: || file->event
896: || of->fd == NGX_INVALID_FILE
897: || file->uses < of->min_uses)
898: {
899: return;
900: }
901:
902: file->use_event = 0;
903:
904: file->event = ngx_calloc(sizeof(ngx_event_t), log);
905: if (file->event== NULL) {
906: return;
907: }
908:
909: fev = ngx_alloc(sizeof(ngx_open_file_cache_event_t), log);
910: if (fev == NULL) {
911: ngx_free(file->event);
912: file->event = NULL;
913: return;
914: }
915:
916: fev->fd = of->fd;
917: fev->file = file;
918: fev->cache = cache;
919:
920: file->event->handler = ngx_open_file_cache_remove;
921: file->event->data = fev;
922:
923: /*
924: * although vnode event may be called while ngx_cycle->poll
925: * destruction, however, cleanup procedures are run before any
926: * memory freeing and events will be canceled.
927: */
928:
929: file->event->log = ngx_cycle->log;
930:
931: if (ngx_add_event(file->event, NGX_VNODE_EVENT, NGX_ONESHOT_EVENT)
932: != NGX_OK)
933: {
934: ngx_free(file->event->data);
935: ngx_free(file->event);
936: file->event = NULL;
937: return;
938: }
939:
940: /*
941: * we do not set file->use_event here because there may be a race
942: * condition: a file may be deleted between opening the file and
943: * adding event, so we rely upon event notification only after
944: * one file revalidation on next file access
945: */
946:
947: return;
948: }
949:
950:
951: static void
952: ngx_open_file_cleanup(void *data)
953: {
954: ngx_open_file_cache_cleanup_t *c = data;
955:
956: c->file->count--;
957:
958: ngx_close_cached_file(c->cache, c->file, c->min_uses, c->log);
959:
960: /* drop one or two expired open files */
961: ngx_expire_old_cached_files(c->cache, 1, c->log);
962: }
963:
964:
965: static void
966: ngx_close_cached_file(ngx_open_file_cache_t *cache,
967: ngx_cached_open_file_t *file, ngx_uint_t min_uses, ngx_log_t *log)
968: {
969: ngx_log_debug5(NGX_LOG_DEBUG_CORE, log, 0,
970: "close cached open file: %s, fd:%d, c:%d, u:%d, %d",
971: file->name, file->fd, file->count, file->uses, file->close);
972:
973: if (!file->close) {
974:
975: file->accessed = ngx_time();
976:
977: ngx_queue_remove(&file->queue);
978:
979: ngx_queue_insert_head(&cache->expire_queue, &file->queue);
980:
981: if (file->uses >= min_uses || file->count) {
982: return;
983: }
984: }
985:
986: ngx_open_file_del_event(file);
987:
988: if (file->count) {
989: return;
990: }
991:
992: if (file->fd != NGX_INVALID_FILE) {
993:
994: if (ngx_close_file(file->fd) == NGX_FILE_ERROR) {
995: ngx_log_error(NGX_LOG_ALERT, log, ngx_errno,
996: ngx_close_file_n " \"%s\" failed", file->name);
997: }
998:
999: file->fd = NGX_INVALID_FILE;
1000: }
1001:
1002: if (!file->close) {
1003: return;
1004: }
1005:
1006: ngx_free(file->name);
1007: ngx_free(file);
1008: }
1009:
1010:
1011: static void
1012: ngx_open_file_del_event(ngx_cached_open_file_t *file)
1013: {
1014: if (file->event == NULL) {
1015: return;
1016: }
1017:
1018: (void) ngx_del_event(file->event, NGX_VNODE_EVENT,
1019: file->count ? NGX_FLUSH_EVENT : NGX_CLOSE_EVENT);
1020:
1021: ngx_free(file->event->data);
1022: ngx_free(file->event);
1023: file->event = NULL;
1024: file->use_event = 0;
1025: }
1026:
1027:
1028: static void
1029: ngx_expire_old_cached_files(ngx_open_file_cache_t *cache, ngx_uint_t n,
1030: ngx_log_t *log)
1031: {
1032: time_t now;
1033: ngx_queue_t *q;
1034: ngx_cached_open_file_t *file;
1035:
1036: now = ngx_time();
1037:
1038: /*
1039: * n == 1 deletes one or two inactive files
1040: * n == 0 deletes least recently used file by force
1041: * and one or two inactive files
1042: */
1043:
1044: while (n < 3) {
1045:
1046: if (ngx_queue_empty(&cache->expire_queue)) {
1047: return;
1048: }
1049:
1050: q = ngx_queue_last(&cache->expire_queue);
1051:
1052: file = ngx_queue_data(q, ngx_cached_open_file_t, queue);
1053:
1054: if (n++ != 0 && now - file->accessed <= cache->inactive) {
1055: return;
1056: }
1057:
1058: ngx_queue_remove(q);
1059:
1060: ngx_rbtree_delete(&cache->rbtree, &file->node);
1061:
1062: cache->current--;
1063:
1064: ngx_log_debug1(NGX_LOG_DEBUG_CORE, log, 0,
1065: "expire cached open file: %s", file->name);
1066:
1067: if (!file->err && !file->is_dir) {
1068: file->close = 1;
1069: ngx_close_cached_file(cache, file, 0, log);
1070:
1071: } else {
1072: ngx_free(file->name);
1073: ngx_free(file);
1074: }
1075: }
1076: }
1077:
1078:
1079: static void
1080: ngx_open_file_cache_rbtree_insert_value(ngx_rbtree_node_t *temp,
1081: ngx_rbtree_node_t *node, ngx_rbtree_node_t *sentinel)
1082: {
1083: ngx_rbtree_node_t **p;
1084: ngx_cached_open_file_t *file, *file_temp;
1085:
1086: for ( ;; ) {
1087:
1088: if (node->key < temp->key) {
1089:
1090: p = &temp->left;
1091:
1092: } else if (node->key > temp->key) {
1093:
1094: p = &temp->right;
1095:
1096: } else { /* node->key == temp->key */
1097:
1098: file = (ngx_cached_open_file_t *) node;
1099: file_temp = (ngx_cached_open_file_t *) temp;
1100:
1101: p = (ngx_strcmp(file->name, file_temp->name) < 0)
1102: ? &temp->left : &temp->right;
1103: }
1104:
1105: if (*p == sentinel) {
1106: break;
1107: }
1108:
1109: temp = *p;
1110: }
1111:
1112: *p = node;
1113: node->parent = temp;
1114: node->left = sentinel;
1115: node->right = sentinel;
1116: ngx_rbt_red(node);
1117: }
1118:
1119:
1120: static ngx_cached_open_file_t *
1121: ngx_open_file_lookup(ngx_open_file_cache_t *cache, ngx_str_t *name,
1122: uint32_t hash)
1123: {
1124: ngx_int_t rc;
1125: ngx_rbtree_node_t *node, *sentinel;
1126: ngx_cached_open_file_t *file;
1127:
1128: node = cache->rbtree.root;
1129: sentinel = cache->rbtree.sentinel;
1130:
1131: while (node != sentinel) {
1132:
1133: if (hash < node->key) {
1134: node = node->left;
1135: continue;
1136: }
1137:
1138: if (hash > node->key) {
1139: node = node->right;
1140: continue;
1141: }
1142:
1143: /* hash == node->key */
1144:
1145: file = (ngx_cached_open_file_t *) node;
1146:
1147: rc = ngx_strcmp(name->data, file->name);
1148:
1149: if (rc == 0) {
1150: return file;
1151: }
1152:
1153: node = (rc < 0) ? node->left : node->right;
1154: }
1155:
1156: return NULL;
1157: }
1158:
1159:
1160: static void
1161: ngx_open_file_cache_remove(ngx_event_t *ev)
1162: {
1163: ngx_cached_open_file_t *file;
1164: ngx_open_file_cache_event_t *fev;
1165:
1166: fev = ev->data;
1167: file = fev->file;
1168:
1169: ngx_queue_remove(&file->queue);
1170:
1171: ngx_rbtree_delete(&fev->cache->rbtree, &file->node);
1172:
1173: fev->cache->current--;
1174:
1175: /* NGX_ONESHOT_EVENT was already deleted */
1176: file->event = NULL;
1177: file->use_event = 0;
1178:
1179: file->close = 1;
1180:
1181: ngx_close_cached_file(fev->cache, file, 0, ev->log);
1182:
1183: /* free memory only when fev->cache and fev->file are already not needed */
1184:
1185: ngx_free(ev->data);
1186: ngx_free(ev);
1187: }