Mercurial > hg > nginx
annotate src/core/ngx_open_file_cache.c @ 1743:4fc402c3ec73
optimize rbtree initialization and insert
| author | Igor Sysoev <igor@sysoev.ru> |
|---|---|
| date | Mon, 17 Dec 2007 08:52:00 +0000 |
| parents | 614090b26fbf |
| children | 1c4b231ba90c |
| 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); | |
| 21 static void ngx_open_file_cleanup(void *data); | |
| 22 static void ngx_close_cached_file(ngx_open_file_cache_t *cache, | |
| 23 ngx_cached_open_file_t *file, ngx_log_t *log); | |
| 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_expire_old_cached_files(ngx_open_file_cache_t *cache, | |
| 27 ngx_uint_t n, ngx_log_t *log); | |
| 28 static void ngx_open_file_cache_rbtree_insert_value(ngx_rbtree_node_t *temp, | |
| 29 ngx_rbtree_node_t *node, ngx_rbtree_node_t *sentinel); | |
| 30 static void ngx_open_file_cache_remove(ngx_event_t *ev); | |
| 31 | |
| 32 | |
| 33 ngx_open_file_cache_t * | |
| 34 ngx_open_file_cache_init(ngx_pool_t *pool, ngx_uint_t max, time_t inactive) | |
| 35 { | |
| 36 ngx_rbtree_node_t *sentinel; | |
| 37 ngx_pool_cleanup_t *cln; | |
| 38 ngx_open_file_cache_t *cache; | |
| 39 | |
| 40 cache = ngx_palloc(pool, sizeof(ngx_open_file_cache_t)); | |
| 41 if (cache == NULL) { | |
| 42 return NULL; | |
| 43 } | |
| 44 | |
| 45 cache->list_head.prev = NULL; | |
| 46 cache->list_head.next = &cache->list_tail; | |
| 47 | |
| 48 cache->list_tail.prev = &cache->list_head; | |
| 49 cache->list_tail.next = NULL; | |
| 50 | |
| 51 sentinel = ngx_palloc(pool, sizeof(ngx_rbtree_node_t)); | |
| 52 if (sentinel == NULL) { | |
| 53 return NULL; | |
| 54 } | |
| 55 | |
|
1743
4fc402c3ec73
optimize rbtree initialization and insert
Igor Sysoev <igor@sysoev.ru>
parents:
1458
diff
changeset
|
56 ngx_rbtree_init(&cache->rbtree, sentinel, |
|
4fc402c3ec73
optimize rbtree initialization and insert
Igor Sysoev <igor@sysoev.ru>
parents:
1458
diff
changeset
|
57 ngx_open_file_cache_rbtree_insert_value); |
| 1453 | 58 |
| 59 cache->current = 0; | |
| 60 cache->max = max; | |
| 61 cache->inactive = inactive; | |
| 62 | |
| 63 cln = ngx_pool_cleanup_add(pool, 0); | |
| 64 if (cln == NULL) { | |
| 65 return NULL; | |
| 66 } | |
| 67 | |
| 68 cln->handler = ngx_open_file_cache_cleanup; | |
| 69 cln->data = cache; | |
| 70 | |
| 71 return cache; | |
| 72 } | |
| 73 | |
| 74 | |
| 75 static void | |
| 76 ngx_open_file_cache_cleanup(void *data) | |
| 77 { | |
| 78 ngx_open_file_cache_t *cache = data; | |
| 79 | |
| 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 file = cache->list_tail.prev; | |
| 88 | |
| 89 if (file == &cache->list_head) { | |
| 90 break; | |
| 91 } | |
| 92 | |
| 93 file->next->prev = file->prev; | |
| 94 file->prev->next = file->next; | |
| 95 | |
| 96 ngx_rbtree_delete(&cache->rbtree, &file->node); | |
| 97 | |
| 98 cache->current--; | |
| 99 | |
| 100 ngx_log_debug1(NGX_LOG_DEBUG_CORE, ngx_cycle->log, 0, | |
| 101 "delete cached open file: %s", file->name); | |
| 102 | |
| 103 if (!file->err && !file->is_dir) { | |
| 104 file->close = 1; | |
| 105 file->count = 0; | |
| 106 ngx_close_cached_file(cache, file, ngx_cycle->log); | |
| 107 | |
| 108 } else { | |
| 109 ngx_free(file->name); | |
| 110 ngx_free(file); | |
| 111 } | |
| 112 } | |
| 113 | |
| 114 if (cache->current) { | |
| 115 ngx_log_error(NGX_LOG_ALERT, ngx_cycle->log, 0, | |
| 116 "%d items still leave in open file cache", | |
| 117 cache->current); | |
| 118 } | |
| 119 | |
| 120 if (cache->rbtree.root != cache->rbtree.sentinel) { | |
| 121 ngx_log_error(NGX_LOG_ALERT, ngx_cycle->log, 0, | |
| 122 "rbtree still is not empty in open file cache"); | |
| 123 | |
| 124 } | |
| 125 } | |
| 126 | |
| 127 | |
| 128 ngx_int_t | |
| 129 ngx_open_cached_file(ngx_open_file_cache_t *cache, ngx_str_t *name, | |
| 130 ngx_open_file_info_t *of, ngx_pool_t *pool) | |
| 131 { | |
| 132 time_t now; | |
| 133 uint32_t hash; | |
| 134 ngx_int_t rc; | |
| 135 ngx_rbtree_node_t *node, *sentinel; | |
| 136 ngx_pool_cleanup_t *cln; | |
| 137 ngx_cached_open_file_t *file; | |
| 138 ngx_pool_cleanup_file_t *clnf; | |
| 139 ngx_open_file_cache_event_t *fev; | |
| 140 ngx_open_file_cache_cleanup_t *ofcln; | |
| 141 | |
| 142 of->err = 0; | |
| 143 | |
| 144 if (cache == NULL) { | |
| 145 | |
| 146 cln = ngx_pool_cleanup_add(pool, sizeof(ngx_pool_cleanup_file_t)); | |
| 147 if (cln == NULL) { | |
| 148 return NGX_ERROR; | |
| 149 } | |
| 150 | |
| 151 rc = ngx_open_and_stat_file(name->data, of, pool->log); | |
| 152 | |
| 153 if (rc == NGX_OK && !of->is_dir) { | |
| 154 cln->handler = ngx_pool_cleanup_file; | |
| 155 clnf = cln->data; | |
| 156 | |
| 157 clnf->fd = of->fd; | |
| 158 clnf->name = name->data; | |
| 159 clnf->log = pool->log; | |
| 160 } | |
| 161 | |
| 162 return rc; | |
| 163 } | |
| 164 | |
| 165 cln = ngx_pool_cleanup_add(pool, sizeof(ngx_open_file_cache_cleanup_t)); | |
| 166 if (cln == NULL) { | |
| 167 return NGX_ERROR; | |
| 168 } | |
| 169 | |
| 170 hash = ngx_crc32_long(name->data, name->len); | |
| 171 | |
| 172 node = cache->rbtree.root; | |
| 173 sentinel = cache->rbtree.sentinel; | |
| 174 | |
| 175 now = ngx_time(); | |
| 176 | |
| 177 while (node != sentinel) { | |
| 178 | |
| 179 if (hash < node->key) { | |
| 180 node = node->left; | |
| 181 continue; | |
| 182 } | |
| 183 | |
| 184 if (hash > node->key) { | |
| 185 node = node->right; | |
| 186 continue; | |
| 187 } | |
| 188 | |
| 189 /* hash == node->key */ | |
| 190 | |
| 191 do { | |
| 192 file = (ngx_cached_open_file_t *) node; | |
| 193 | |
| 194 rc = ngx_strcmp(name->data, file->name); | |
| 195 | |
| 196 if (rc == 0) { | |
| 197 | |
| 198 file->next->prev = file->prev; | |
| 199 file->prev->next = file->next; | |
| 200 | |
| 201 if (file->event || now - file->created < of->retest) { | |
| 202 if (file->err == 0) { | |
| 203 of->fd = file->fd; | |
| 204 of->uniq = file->uniq; | |
| 205 of->mtime = file->mtime; | |
| 206 of->size = file->size; | |
| 207 | |
| 208 of->is_dir = file->is_dir; | |
| 209 of->is_file = file->is_file; | |
| 210 of->is_link = file->is_link; | |
| 211 of->is_exec = file->is_exec; | |
| 212 | |
| 213 if (!file->is_dir) { | |
| 214 file->count++; | |
| 215 } | |
| 216 | |
| 217 } else { | |
| 218 of->err = file->err; | |
| 219 } | |
| 220 | |
| 221 goto found; | |
| 222 } | |
| 223 | |
| 224 ngx_log_debug4(NGX_LOG_DEBUG_CORE, pool->log, 0, | |
| 225 "retest open file: %s, fd:%d, c:%d, e:%d", | |
| 226 file->name, file->fd, file->count, file->err); | |
| 227 | |
| 228 if (file->is_dir) { | |
| 229 | |
| 230 /* | |
| 231 * chances that directory became file are very small | |
| 232 * so test_dir flag allows to use a single ngx_file_info() | |
| 233 * syscall instead of three syscalls | |
| 234 */ | |
| 235 | |
| 236 of->test_dir = 1; | |
| 237 } | |
| 238 | |
| 239 rc = ngx_open_and_stat_file(name->data, of, pool->log); | |
| 240 | |
| 241 if (rc != NGX_OK && (of->err == 0 || !of->errors)) { | |
| 242 goto failed; | |
| 243 } | |
| 244 | |
| 245 if (of->is_dir) { | |
| 246 if (file->is_dir || file->err) { | |
| 247 goto update; | |
| 248 } | |
| 249 | |
| 250 /* file became directory */ | |
| 251 | |
| 252 } else if (of->err == 0) { /* file */ | |
| 253 | |
| 254 if (file->is_dir || file->err) { | |
| 255 goto update; | |
| 256 } | |
| 257 | |
| 258 if (of->uniq == file->uniq | |
| 259 && of->mtime == file->mtime | |
| 260 && of->size == file->size) | |
| 261 { | |
| 262 if (ngx_close_file(of->fd) == NGX_FILE_ERROR) { | |
| 263 ngx_log_error(NGX_LOG_ALERT, pool->log, ngx_errno, | |
| 264 ngx_close_file_n " \"%s\" failed", | |
| 265 name->data); | |
| 266 } | |
| 267 | |
| 268 of->fd = file->fd; | |
| 269 file->count++; | |
| 270 | |
| 271 goto renew; | |
| 272 } | |
| 273 | |
| 274 /* file was changed */ | |
| 275 | |
| 276 } else { /* error to cache */ | |
| 277 | |
| 278 if (file->err || file->is_dir) { | |
| 279 goto update; | |
| 280 } | |
| 281 | |
| 282 /* file was removed, etc. */ | |
| 283 } | |
| 284 | |
| 285 if (file->count == 0) { | |
| 286 if (ngx_close_file(file->fd) == NGX_FILE_ERROR) { | |
| 287 ngx_log_error(NGX_LOG_ALERT, pool->log, ngx_errno, | |
| 288 ngx_close_file_n " \"%s\" failed", | |
| 289 name->data); | |
| 290 } | |
| 291 | |
| 292 goto update; | |
| 293 } | |
| 294 | |
| 295 ngx_rbtree_delete(&cache->rbtree, &file->node); | |
| 296 | |
| 297 cache->current--; | |
| 298 | |
| 299 file->close = 1; | |
| 300 | |
| 301 goto create; | |
| 302 } | |
| 303 | |
| 304 node = (rc < 0) ? node->left : node->right; | |
| 305 | |
| 306 } while (node != sentinel && hash == node->key); | |
| 307 | |
| 308 break; | |
| 309 } | |
| 310 | |
| 311 /* not found */ | |
| 312 | |
| 313 file = NULL; | |
| 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 | |
| 349 file->count = 0; | |
| 350 | |
| 351 update: | |
| 352 | |
|
1458
614090b26fbf
test the most relevant condition first
Igor Sysoev <igor@sysoev.ru>
parents:
1457
diff
changeset
|
353 if (of->events |
|
614090b26fbf
test the most relevant condition first
Igor Sysoev <igor@sysoev.ru>
parents:
1457
diff
changeset
|
354 && (ngx_event_flags & NGX_USE_VNODE_EVENT) |
| 1457 | 355 && of->fd != NGX_INVALID_FILE) |
| 356 { | |
| 1453 | 357 file->event = ngx_calloc(sizeof(ngx_event_t), pool->log); |
| 358 if (file->event== NULL) { | |
| 359 goto failed; | |
| 360 } | |
| 361 | |
| 362 fev = ngx_alloc(sizeof(ngx_open_file_cache_event_t), pool->log); | |
| 363 if (fev == NULL) { | |
| 364 goto failed; | |
| 365 } | |
| 366 | |
| 367 fev->fd = of->fd; | |
| 368 fev->file = file; | |
| 369 fev->cache = cache; | |
| 370 | |
| 371 file->event->handler = ngx_open_file_cache_remove; | |
| 372 file->event->data = fev; | |
| 373 | |
| 374 /* | |
| 375 * although vnode event may be called while ngx_cycle->poll | |
| 376 * destruction; however, cleanup procedures are run before any | |
| 377 * memory freeing and events will be canceled. | |
| 378 */ | |
| 379 | |
| 380 file->event->log = ngx_cycle->log; | |
| 381 | |
| 382 if (ngx_add_event(file->event, NGX_VNODE_EVENT, NGX_ONESHOT_EVENT) | |
| 383 != NGX_OK) | |
| 384 { | |
| 385 ngx_free(file->event->data); | |
| 386 ngx_free(file->event); | |
| 387 goto failed; | |
| 388 } | |
| 389 | |
| 390 } else { | |
| 391 file->event = NULL; | |
| 392 } | |
| 393 | |
| 394 file->fd = of->fd; | |
| 395 file->err = of->err; | |
| 396 | |
| 397 if (of->err == 0) { | |
| 398 file->uniq = of->uniq; | |
| 399 file->mtime = of->mtime; | |
| 400 file->size = of->size; | |
| 401 | |
| 402 file->close = 0; | |
| 403 | |
| 404 file->is_dir = of->is_dir; | |
| 405 file->is_file = of->is_file; | |
| 406 file->is_link = of->is_link; | |
| 407 file->is_exec = of->is_exec; | |
| 408 | |
| 409 if (!of->is_dir) { | |
| 410 file->count++; | |
| 411 } | |
| 412 } | |
| 413 | |
| 414 renew: | |
| 415 | |
| 416 file->created = now; | |
| 417 | |
| 418 found: | |
| 419 | |
| 420 file->accessed = now; | |
| 421 | |
| 422 /* add to the inactive list head */ | |
| 423 | |
| 424 file->next = cache->list_head.next; | |
| 425 file->next->prev = file; | |
| 426 file->prev = &cache->list_head; | |
| 427 cache->list_head.next = file; | |
| 428 | |
| 429 ngx_log_debug4(NGX_LOG_DEBUG_CORE, pool->log, 0, | |
| 430 "cached open file: %s, fd:%d, c:%d, e:%d", | |
| 431 file->name, file->fd, file->count, file->err); | |
| 432 | |
| 433 if (of->err == 0) { | |
| 434 | |
| 435 if (!of->is_dir) { | |
| 436 cln->handler = ngx_open_file_cleanup; | |
| 437 ofcln = cln->data; | |
| 438 | |
| 439 ofcln->cache = cache; | |
| 440 ofcln->file = file; | |
| 441 ofcln->log = pool->log; | |
| 442 } | |
| 443 | |
| 444 return NGX_OK; | |
| 445 } | |
| 446 | |
| 447 return NGX_ERROR; | |
| 448 | |
| 449 failed: | |
| 450 | |
| 451 if (file && file->count == 0) { | |
| 452 ngx_rbtree_delete(&cache->rbtree, &file->node); | |
| 453 | |
| 454 cache->current--; | |
| 455 | |
| 456 if (ngx_close_file(file->fd) == NGX_FILE_ERROR) { | |
| 457 ngx_log_error(NGX_LOG_ALERT, pool->log, ngx_errno, | |
| 458 ngx_close_file_n " \"%s\" failed", file->name); | |
| 459 } | |
| 460 | |
| 461 ngx_free(file->name); | |
| 462 ngx_free(file); | |
| 463 } | |
| 464 | |
| 465 if (of->fd != NGX_INVALID_FILE) { | |
| 466 if (ngx_close_file(of->fd) == NGX_FILE_ERROR) { | |
| 467 ngx_log_error(NGX_LOG_ALERT, pool->log, ngx_errno, | |
| 468 ngx_close_file_n " \"%s\" failed", name->data); | |
| 469 } | |
| 470 } | |
| 471 | |
| 472 return NGX_ERROR; | |
| 473 } | |
| 474 | |
| 475 | |
| 476 static ngx_int_t | |
| 477 ngx_open_and_stat_file(u_char *name, ngx_open_file_info_t *of, ngx_log_t *log) | |
| 478 { | |
| 479 ngx_fd_t fd; | |
| 480 ngx_file_info_t fi; | |
| 481 | |
| 482 of->fd = NGX_INVALID_FILE; | |
| 483 | |
| 484 if (of->test_dir) { | |
| 485 | |
| 486 if (ngx_file_info(name, &fi) == -1) { | |
| 487 of->err = ngx_errno; | |
| 488 | |
| 489 return NGX_ERROR; | |
| 490 } | |
| 491 | |
| 492 of->uniq = ngx_file_uniq(&fi); | |
| 493 of->mtime = ngx_file_mtime(&fi); | |
| 494 of->size = ngx_file_size(&fi); | |
| 495 of->is_dir = ngx_is_dir(&fi); | |
| 496 of->is_file = ngx_is_file(&fi); | |
| 497 of->is_link = ngx_is_link(&fi); | |
| 498 of->is_exec = ngx_is_exec(&fi); | |
| 499 | |
| 500 if (of->is_dir) { | |
| 501 return NGX_OK; | |
| 502 } | |
| 503 } | |
| 504 | |
| 505 fd = ngx_open_file(name, NGX_FILE_RDONLY, NGX_FILE_OPEN, 0); | |
| 506 | |
| 507 if (fd == NGX_INVALID_FILE) { | |
| 508 of->err = ngx_errno; | |
| 509 return NGX_ERROR; | |
| 510 } | |
| 511 | |
| 512 if (ngx_fd_info(fd, &fi) == NGX_FILE_ERROR) { | |
| 513 ngx_log_error(NGX_LOG_CRIT, log, ngx_errno, | |
| 514 ngx_fd_info_n " \"%s\" failed", name); | |
| 515 | |
| 516 if (ngx_close_file(fd) == NGX_FILE_ERROR) { | |
| 517 ngx_log_error(NGX_LOG_ALERT, log, ngx_errno, | |
| 518 ngx_close_file_n " \"%s\" failed", name); | |
| 519 } | |
| 520 | |
| 521 return NGX_ERROR; | |
| 522 } | |
| 523 | |
| 524 if (ngx_is_dir(&fi)) { | |
| 525 if (ngx_close_file(fd) == NGX_FILE_ERROR) { | |
| 526 ngx_log_error(NGX_LOG_ALERT, log, ngx_errno, | |
| 527 ngx_close_file_n " \"%s\" failed", name); | |
| 528 } | |
| 529 | |
| 530 fd = NGX_INVALID_FILE; | |
| 531 } | |
| 532 | |
| 533 of->fd = fd; | |
| 534 of->uniq = ngx_file_uniq(&fi); | |
| 535 of->mtime = ngx_file_mtime(&fi); | |
| 536 of->size = ngx_file_size(&fi); | |
| 537 of->is_dir = ngx_is_dir(&fi); | |
| 538 of->is_file = ngx_is_file(&fi); | |
| 539 of->is_link = ngx_is_link(&fi); | |
| 540 of->is_exec = ngx_is_exec(&fi); | |
| 541 | |
| 542 return NGX_OK; | |
| 543 } | |
| 544 | |
| 545 | |
| 546 static void | |
| 547 ngx_open_file_cleanup(void *data) | |
| 548 { | |
| 549 ngx_open_file_cache_cleanup_t *c = data; | |
| 550 | |
| 551 c->file->count--; | |
| 552 | |
| 553 ngx_close_cached_file(c->cache, c->file, c->log); | |
| 554 | |
| 555 /* drop one or two expired open files */ | |
| 556 ngx_expire_old_cached_files(c->cache, 1, c->log); | |
| 557 } | |
| 558 | |
| 559 | |
| 560 static void | |
| 561 ngx_close_cached_file(ngx_open_file_cache_t *cache, | |
| 562 ngx_cached_open_file_t *file, ngx_log_t *log) | |
| 563 { | |
| 564 ngx_log_debug4(NGX_LOG_DEBUG_CORE, log, 0, | |
| 565 "close cached open file: %s, fd:%d, c:%d, %d", | |
| 566 file->name, file->fd, file->count, file->close); | |
| 567 | |
| 568 if (!file->close) { | |
| 569 | |
| 570 file->accessed = ngx_time(); | |
| 571 | |
| 572 if (cache->list_head.next != file) { | |
| 573 | |
| 574 /* delete from inactive list */ | |
| 575 | |
| 576 file->next->prev = file->prev; | |
| 577 file->prev->next = file->next; | |
| 578 | |
| 579 /* add to the inactive list head */ | |
| 580 | |
| 581 file->next = cache->list_head.next; | |
| 582 file->next->prev = file; | |
| 583 file->prev = &cache->list_head; | |
| 584 cache->list_head.next = file; | |
| 585 } | |
| 586 | |
| 587 return; | |
| 588 } | |
| 589 | |
| 590 if (file->event) { | |
| 591 (void) ngx_del_event(file->event, NGX_VNODE_EVENT, | |
| 592 file->count ? NGX_FLUSH_EVENT : NGX_CLOSE_EVENT); | |
| 593 | |
| 594 ngx_free(file->event->data); | |
| 595 ngx_free(file->event); | |
| 596 file->event = NULL; | |
| 597 } | |
| 598 | |
| 599 if (file->count) { | |
| 600 return; | |
| 601 } | |
| 602 | |
| 603 if (ngx_close_file(file->fd) == NGX_FILE_ERROR) { | |
| 604 ngx_log_error(NGX_LOG_ALERT, log, ngx_errno, | |
| 605 ngx_close_file_n " \"%s\" failed", file->name); | |
| 606 } | |
| 607 | |
| 608 ngx_free(file->name); | |
| 609 ngx_free(file); | |
| 610 } | |
| 611 | |
| 612 | |
| 613 static void | |
| 614 ngx_expire_old_cached_files(ngx_open_file_cache_t *cache, ngx_uint_t n, | |
| 615 ngx_log_t *log) | |
| 616 { | |
| 617 time_t now; | |
| 618 ngx_cached_open_file_t *file; | |
| 619 | |
| 620 now = ngx_time(); | |
| 621 | |
| 622 /* | |
| 623 * n == 1 deletes one or two inactive files | |
| 624 * n == 0 deletes least recently used file by force | |
| 625 * and one or two inactive files | |
| 626 */ | |
| 627 | |
| 628 while (n < 3) { | |
| 629 | |
| 630 file = cache->list_tail.prev; | |
| 631 | |
| 632 if (file == &cache->list_head) { | |
| 633 return; | |
| 634 } | |
| 635 | |
| 636 if (n++ != 0 && now - file->accessed <= cache->inactive) { | |
| 637 return; | |
| 638 } | |
| 639 | |
| 640 file->next->prev = file->prev; | |
| 641 file->prev->next = file->next; | |
| 642 | |
| 643 ngx_rbtree_delete(&cache->rbtree, &file->node); | |
| 644 | |
| 645 cache->current--; | |
| 646 | |
| 647 ngx_log_debug1(NGX_LOG_DEBUG_CORE, log, 0, | |
| 648 "expire cached open file: %s", file->name); | |
| 649 | |
| 650 if (!file->err && !file->is_dir) { | |
| 651 file->close = 1; | |
| 652 ngx_close_cached_file(cache, file, log); | |
| 653 | |
| 654 } else { | |
| 655 ngx_free(file->name); | |
| 656 ngx_free(file); | |
| 657 } | |
| 658 } | |
| 659 } | |
| 660 | |
| 661 | |
| 662 static void | |
| 663 ngx_open_file_cache_rbtree_insert_value(ngx_rbtree_node_t *temp, | |
| 664 ngx_rbtree_node_t *node, ngx_rbtree_node_t *sentinel) | |
| 665 { | |
| 666 ngx_rbtree_node_t **p; | |
| 667 ngx_cached_open_file_t *file, *file_temp; | |
| 668 | |
| 669 for ( ;; ) { | |
| 670 | |
| 671 if (node->key < temp->key) { | |
| 672 | |
| 673 p = &temp->left; | |
| 674 | |
| 675 } else if (node->key > temp->key) { | |
| 676 | |
| 677 p = &temp->right; | |
| 678 | |
| 679 } else { /* node->key == temp->key */ | |
| 680 | |
| 681 file = (ngx_cached_open_file_t *) node; | |
| 682 file_temp = (ngx_cached_open_file_t *) temp; | |
| 683 | |
| 684 p = (ngx_strcmp(file->name, file_temp->name) < 0) | |
| 685 ? &temp->left : &temp->right; | |
| 686 } | |
| 687 | |
| 688 if (*p == sentinel) { | |
| 689 break; | |
| 690 } | |
| 691 | |
| 692 temp = *p; | |
| 693 } | |
| 694 | |
| 695 *p = node; | |
| 696 node->parent = temp; | |
| 697 node->left = sentinel; | |
| 698 node->right = sentinel; | |
| 699 ngx_rbt_red(node); | |
| 700 } | |
| 701 | |
| 702 | |
| 703 static void | |
| 704 ngx_open_file_cache_remove(ngx_event_t *ev) | |
| 705 { | |
| 706 ngx_cached_open_file_t *file; | |
| 707 ngx_open_file_cache_event_t *fev; | |
| 708 | |
| 709 fev = ev->data; | |
| 710 file = fev->file; | |
| 711 | |
| 712 file->next->prev = file->prev; | |
| 713 file->prev->next = file->next; | |
| 714 | |
| 715 ngx_rbtree_delete(&fev->cache->rbtree, &file->node); | |
| 716 | |
| 717 fev->cache->current--; | |
| 718 | |
| 719 /* NGX_ONESHOT_EVENT was already deleted */ | |
| 720 file->event = NULL; | |
| 721 | |
| 722 file->close = 1; | |
| 723 | |
| 724 ngx_close_cached_file(fev->cache, file, ev->log); | |
| 725 | |
| 726 /* free memory only when fev->cache and fev->file are already not needed */ | |
| 727 | |
| 728 ngx_free(ev->data); | |
| 729 ngx_free(ev); | |
| 730 } |