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 } |