Mercurial > hg > nginx
annotate src/core/ngx_open_file_cache.c @ 2006:b52cb9bf2064
style fix: remove tabs and trailing spaces
| author | Igor Sysoev <igor@sysoev.ru> |
|---|---|
| date | Wed, 14 May 2008 07:54:52 +0000 |
| parents | 34051c712e41 |
| children | 67a29af877ed |
| 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) |
| 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 | |
| 215 goto found; | |
| 216 } | |
| 217 | |
| 218 ngx_log_debug4(NGX_LOG_DEBUG_CORE, pool->log, 0, | |
| 219 "retest open file: %s, fd:%d, c:%d, e:%d", | |
| 220 file->name, file->fd, file->count, file->err); | |
| 1453 | 221 |
| 1775 | 222 if (file->is_dir) { |
| 223 | |
| 224 /* | |
| 225 * chances that directory became file are very small | |
| 226 * so test_dir flag allows to use a single syscall | |
| 227 * in ngx_file_info() instead of three syscalls | |
| 228 */ | |
| 229 | |
| 230 of->test_dir = 1; | |
| 231 } | |
| 232 | |
| 233 rc = ngx_open_and_stat_file(name->data, of, pool->log); | |
| 1453 | 234 |
| 1775 | 235 if (rc != NGX_OK && (of->err == 0 || !of->errors)) { |
| 236 goto failed; | |
| 237 } | |
| 238 | |
| 239 if (of->is_dir) { | |
| 240 | |
| 241 if (file->is_dir || file->err) { | |
| 242 goto update; | |
| 243 } | |
| 244 | |
| 245 /* file became directory */ | |
| 1453 | 246 |
| 1775 | 247 } else if (of->err == 0) { /* file */ |
| 248 | |
| 249 if (file->is_dir || file->err) { | |
| 250 goto add_event; | |
| 251 } | |
| 1453 | 252 |
| 1775 | 253 if (of->uniq == file->uniq |
| 254 && of->mtime == file->mtime | |
| 255 && of->size == file->size) | |
| 256 { | |
| 257 if (ngx_close_file(of->fd) == NGX_FILE_ERROR) { | |
| 258 ngx_log_error(NGX_LOG_ALERT, pool->log, ngx_errno, | |
| 259 ngx_close_file_n " \"%s\" failed", | |
| 260 name->data); | |
| 1453 | 261 } |
| 262 | |
| 1775 | 263 of->fd = file->fd; |
| 264 file->count++; | |
| 1453 | 265 |
| 1775 | 266 if (file->event) { |
| 267 file->use_event = 1; | |
| 268 goto renew; | |
| 1453 | 269 } |
| 270 | |
| 1775 | 271 ngx_open_file_add_event(cache, file, of, pool->log); |
| 272 | |
| 273 goto renew; | |
| 274 } | |
| 1453 | 275 |
| 1775 | 276 /* file was changed */ |
| 1453 | 277 |
| 1775 | 278 } else { /* error to cache */ |
| 1453 | 279 |
| 1775 | 280 if (file->err || file->is_dir) { |
| 281 goto update; | |
| 1453 | 282 } |
| 283 | |
| 1775 | 284 /* file was removed, etc. */ |
| 285 } | |
| 286 | |
| 287 if (file->count == 0) { | |
| 288 | |
| 289 ngx_open_file_del_event(file); | |
| 1453 | 290 |
| 1775 | 291 if (ngx_close_file(file->fd) == NGX_FILE_ERROR) { |
| 292 ngx_log_error(NGX_LOG_ALERT, pool->log, ngx_errno, | |
| 293 ngx_close_file_n " \"%s\" failed", | |
| 294 name->data); | |
| 295 } | |
| 1453 | 296 |
| 1775 | 297 goto add_event; |
| 298 } | |
| 299 | |
| 300 ngx_rbtree_delete(&cache->rbtree, &file->node); | |
| 301 | |
| 302 cache->current--; | |
| 303 | |
| 304 file->close = 1; | |
| 305 | |
| 306 goto create; | |
| 1453 | 307 } |
| 308 | |
| 309 /* not found */ | |
| 310 | |
| 311 rc = ngx_open_and_stat_file(name->data, of, pool->log); | |
| 312 | |
| 313 if (rc != NGX_OK && (of->err == 0 || !of->errors)) { | |
| 314 goto failed; | |
| 315 } | |
| 316 | |
| 317 create: | |
| 318 | |
| 319 if (cache->current >= cache->max) { | |
| 320 ngx_expire_old_cached_files(cache, 0, pool->log); | |
| 321 } | |
| 322 | |
| 323 file = ngx_alloc(sizeof(ngx_cached_open_file_t), pool->log); | |
| 324 | |
| 325 if (file == NULL) { | |
| 326 goto failed; | |
| 327 } | |
| 328 | |
| 329 file->name = ngx_alloc(name->len + 1, pool->log); | |
| 330 | |
| 331 if (file->name == NULL) { | |
| 332 ngx_free(file); | |
| 333 file = NULL; | |
| 334 goto failed; | |
| 335 } | |
| 336 | |
| 337 ngx_cpystrn(file->name, name->data, name->len + 1); | |
| 338 | |
| 339 file->node.key = hash; | |
| 340 | |
| 341 ngx_rbtree_insert(&cache->rbtree, &file->node); | |
| 342 | |
| 343 cache->current++; | |
| 344 | |
| 1775 | 345 file->uses = 1; |
| 1453 | 346 file->count = 0; |
| 1775 | 347 file->use_event = 0; |
| 348 file->event = NULL; | |
| 349 | |
| 350 add_event: | |
| 351 | |
| 352 ngx_open_file_add_event(cache, file, of, pool->log); | |
| 1453 | 353 |
| 354 update: | |
| 355 | |
| 356 file->fd = of->fd; | |
| 357 file->err = of->err; | |
| 358 | |
| 359 if (of->err == 0) { | |
| 360 file->uniq = of->uniq; | |
| 361 file->mtime = of->mtime; | |
| 362 file->size = of->size; | |
| 363 | |
| 364 file->close = 0; | |
| 365 | |
| 366 file->is_dir = of->is_dir; | |
| 367 file->is_file = of->is_file; | |
| 368 file->is_link = of->is_link; | |
| 369 file->is_exec = of->is_exec; | |
| 370 | |
| 371 if (!of->is_dir) { | |
| 372 file->count++; | |
| 373 } | |
| 374 } | |
| 375 | |
| 376 renew: | |
| 377 | |
| 378 file->created = now; | |
| 379 | |
| 380 found: | |
| 381 | |
| 382 file->accessed = now; | |
| 383 | |
| 1765 | 384 ngx_queue_insert_head(&cache->expire_queue, &file->queue); |
| 1453 | 385 |
| 1772 | 386 ngx_log_debug5(NGX_LOG_DEBUG_CORE, pool->log, 0, |
| 387 "cached open file: %s, fd:%d, c:%d, e:%d, u:%d", | |
| 388 file->name, file->fd, file->count, file->err, file->uses); | |
| 1453 | 389 |
| 390 if (of->err == 0) { | |
| 391 | |
| 392 if (!of->is_dir) { | |
| 393 cln->handler = ngx_open_file_cleanup; | |
| 394 ofcln = cln->data; | |
| 395 | |
| 396 ofcln->cache = cache; | |
| 397 ofcln->file = file; | |
| 1772 | 398 ofcln->min_uses = of->min_uses; |
| 1453 | 399 ofcln->log = pool->log; |
| 400 } | |
| 401 | |
| 402 return NGX_OK; | |
| 403 } | |
| 404 | |
| 405 return NGX_ERROR; | |
| 406 | |
| 407 failed: | |
| 408 | |
|
1988
34051c712e41
fix segfault when file is deleted and open_file_cache_errors is off
Igor Sysoev <igor@sysoev.ru>
parents:
1987
diff
changeset
|
409 if (file) { |
| 1453 | 410 ngx_rbtree_delete(&cache->rbtree, &file->node); |
| 411 | |
| 412 cache->current--; | |
| 413 | |
|
1988
34051c712e41
fix segfault when file is deleted and open_file_cache_errors is off
Igor Sysoev <igor@sysoev.ru>
parents:
1987
diff
changeset
|
414 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
|
415 |
|
2006
b52cb9bf2064
style fix: remove tabs and trailing spaces
Igor Sysoev <igor@sysoev.ru>
parents:
1988
diff
changeset
|
416 if (file->fd != NGX_INVALID_FILE) { |
|
b52cb9bf2064
style fix: remove tabs and trailing spaces
Igor Sysoev <igor@sysoev.ru>
parents:
1988
diff
changeset
|
417 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
|
418 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
|
419 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
|
420 file->name); |
|
2006
b52cb9bf2064
style fix: remove tabs and trailing spaces
Igor Sysoev <igor@sysoev.ru>
parents:
1988
diff
changeset
|
421 } |
|
b52cb9bf2064
style fix: remove tabs and trailing spaces
Igor Sysoev <igor@sysoev.ru>
parents:
1988
diff
changeset
|
422 } |
|
1988
34051c712e41
fix segfault when file is deleted and open_file_cache_errors is off
Igor Sysoev <igor@sysoev.ru>
parents:
1987
diff
changeset
|
423 |
|
34051c712e41
fix segfault when file is deleted and open_file_cache_errors is off
Igor Sysoev <igor@sysoev.ru>
parents:
1987
diff
changeset
|
424 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
|
425 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
|
426 |
|
34051c712e41
fix segfault when file is deleted and open_file_cache_errors is off
Igor Sysoev <igor@sysoev.ru>
parents:
1987
diff
changeset
|
427 } else { |
|
34051c712e41
fix segfault when file is deleted and open_file_cache_errors is off
Igor Sysoev <igor@sysoev.ru>
parents:
1987
diff
changeset
|
428 file->close = 1; |
| 1453 | 429 } |
| 430 } | |
| 431 | |
| 432 if (of->fd != NGX_INVALID_FILE) { | |
| 433 if (ngx_close_file(of->fd) == NGX_FILE_ERROR) { | |
| 434 ngx_log_error(NGX_LOG_ALERT, pool->log, ngx_errno, | |
| 435 ngx_close_file_n " \"%s\" failed", name->data); | |
| 436 } | |
| 437 } | |
| 438 | |
| 439 return NGX_ERROR; | |
| 440 } | |
| 441 | |
| 442 | |
| 443 static ngx_int_t | |
| 444 ngx_open_and_stat_file(u_char *name, ngx_open_file_info_t *of, ngx_log_t *log) | |
| 445 { | |
| 446 ngx_fd_t fd; | |
| 447 ngx_file_info_t fi; | |
| 448 | |
| 449 of->fd = NGX_INVALID_FILE; | |
| 450 | |
| 451 if (of->test_dir) { | |
| 452 | |
| 453 if (ngx_file_info(name, &fi) == -1) { | |
| 454 of->err = ngx_errno; | |
| 455 | |
| 456 return NGX_ERROR; | |
| 457 } | |
| 458 | |
| 459 of->uniq = ngx_file_uniq(&fi); | |
| 460 of->mtime = ngx_file_mtime(&fi); | |
| 461 of->size = ngx_file_size(&fi); | |
| 462 of->is_dir = ngx_is_dir(&fi); | |
| 463 of->is_file = ngx_is_file(&fi); | |
| 464 of->is_link = ngx_is_link(&fi); | |
| 465 of->is_exec = ngx_is_exec(&fi); | |
| 466 | |
| 467 if (of->is_dir) { | |
| 468 return NGX_OK; | |
| 469 } | |
| 470 } | |
| 471 | |
| 472 fd = ngx_open_file(name, NGX_FILE_RDONLY, NGX_FILE_OPEN, 0); | |
| 473 | |
| 474 if (fd == NGX_INVALID_FILE) { | |
| 475 of->err = ngx_errno; | |
| 476 return NGX_ERROR; | |
| 477 } | |
| 478 | |
| 479 if (ngx_fd_info(fd, &fi) == NGX_FILE_ERROR) { | |
| 480 ngx_log_error(NGX_LOG_CRIT, log, ngx_errno, | |
| 481 ngx_fd_info_n " \"%s\" failed", name); | |
| 482 | |
| 483 if (ngx_close_file(fd) == NGX_FILE_ERROR) { | |
| 484 ngx_log_error(NGX_LOG_ALERT, log, ngx_errno, | |
| 485 ngx_close_file_n " \"%s\" failed", name); | |
| 486 } | |
| 487 | |
| 488 return NGX_ERROR; | |
| 489 } | |
| 490 | |
| 491 if (ngx_is_dir(&fi)) { | |
| 492 if (ngx_close_file(fd) == NGX_FILE_ERROR) { | |
| 493 ngx_log_error(NGX_LOG_ALERT, log, ngx_errno, | |
| 494 ngx_close_file_n " \"%s\" failed", name); | |
| 495 } | |
| 496 | |
| 497 fd = NGX_INVALID_FILE; | |
| 498 } | |
| 499 | |
| 500 of->fd = fd; | |
| 501 of->uniq = ngx_file_uniq(&fi); | |
| 502 of->mtime = ngx_file_mtime(&fi); | |
| 503 of->size = ngx_file_size(&fi); | |
| 504 of->is_dir = ngx_is_dir(&fi); | |
| 505 of->is_file = ngx_is_file(&fi); | |
| 506 of->is_link = ngx_is_link(&fi); | |
| 507 of->is_exec = ngx_is_exec(&fi); | |
| 508 | |
| 509 return NGX_OK; | |
| 510 } | |
| 511 | |
| 512 | |
| 1775 | 513 /* |
| 514 * we ignore any possible event setting error and | |
| 515 * fallback to usual periodic file retests | |
| 516 */ | |
| 517 | |
| 518 static void | |
| 519 ngx_open_file_add_event(ngx_open_file_cache_t *cache, | |
| 520 ngx_cached_open_file_t *file, ngx_open_file_info_t *of, ngx_log_t *log) | |
| 521 { | |
| 522 ngx_open_file_cache_event_t *fev; | |
| 523 | |
| 524 if (!(ngx_event_flags & NGX_USE_VNODE_EVENT) | |
| 525 || !of->events | |
| 526 || file->event | |
| 527 || of->fd == NGX_INVALID_FILE | |
| 528 || file->uses < of->min_uses) | |
| 529 { | |
| 530 return; | |
| 531 } | |
| 532 | |
| 533 file->event = ngx_calloc(sizeof(ngx_event_t), log); | |
| 534 if (file->event== NULL) { | |
| 535 return; | |
| 536 } | |
| 537 | |
| 538 fev = ngx_alloc(sizeof(ngx_open_file_cache_event_t), log); | |
| 539 if (fev == NULL) { | |
| 540 ngx_free(file->event); | |
| 541 file->event = NULL; | |
| 542 return; | |
| 543 } | |
| 544 | |
| 545 fev->fd = of->fd; | |
| 546 fev->file = file; | |
| 547 fev->cache = cache; | |
| 548 | |
| 549 file->event->handler = ngx_open_file_cache_remove; | |
| 550 file->event->data = fev; | |
| 551 | |
| 552 /* | |
| 553 * although vnode event may be called while ngx_cycle->poll | |
| 554 * destruction, however, cleanup procedures are run before any | |
| 555 * memory freeing and events will be canceled. | |
| 556 */ | |
| 557 | |
| 558 file->event->log = ngx_cycle->log; | |
| 559 | |
| 560 if (ngx_add_event(file->event, NGX_VNODE_EVENT, NGX_ONESHOT_EVENT) | |
| 561 != NGX_OK) | |
| 562 { | |
| 563 ngx_free(file->event->data); | |
| 564 ngx_free(file->event); | |
| 565 file->event = NULL; | |
| 566 return; | |
| 567 } | |
| 568 | |
| 569 /* | |
| 570 * we do not file->use_event here because there may be a race | |
| 571 * condition between opening file and adding event, so we rely | |
| 572 * upon event notification only after first file revalidation | |
| 573 */ | |
| 574 | |
| 575 return; | |
| 576 } | |
| 577 | |
| 578 | |
| 1453 | 579 static void |
| 580 ngx_open_file_cleanup(void *data) | |
| 581 { | |
| 582 ngx_open_file_cache_cleanup_t *c = data; | |
| 583 | |
| 584 c->file->count--; | |
| 585 | |
| 1772 | 586 ngx_close_cached_file(c->cache, c->file, c->min_uses, c->log); |
| 1453 | 587 |
| 588 /* drop one or two expired open files */ | |
| 589 ngx_expire_old_cached_files(c->cache, 1, c->log); | |
| 590 } | |
| 591 | |
| 592 | |
| 593 static void | |
| 594 ngx_close_cached_file(ngx_open_file_cache_t *cache, | |
| 1772 | 595 ngx_cached_open_file_t *file, ngx_uint_t min_uses, ngx_log_t *log) |
| 1453 | 596 { |
| 1772 | 597 ngx_log_debug5(NGX_LOG_DEBUG_CORE, log, 0, |
| 598 "close cached open file: %s, fd:%d, c:%d, u:%d, %d", | |
| 599 file->name, file->fd, file->count, file->uses, file->close); | |
| 1453 | 600 |
| 601 if (!file->close) { | |
| 602 | |
| 603 file->accessed = ngx_time(); | |
| 604 | |
| 1765 | 605 ngx_queue_remove(&file->queue); |
| 1453 | 606 |
| 1765 | 607 ngx_queue_insert_head(&cache->expire_queue, &file->queue); |
| 1453 | 608 |
| 1772 | 609 if (file->uses >= min_uses || file->count) { |
| 610 return; | |
| 611 } | |
| 1453 | 612 } |
| 613 | |
| 1775 | 614 ngx_open_file_del_event(file); |
| 1453 | 615 |
| 616 if (file->count) { | |
| 617 return; | |
| 618 } | |
| 619 | |
| 1772 | 620 if (file->fd != NGX_INVALID_FILE) { |
| 621 | |
| 622 if (ngx_close_file(file->fd) == NGX_FILE_ERROR) { | |
| 623 ngx_log_error(NGX_LOG_ALERT, log, ngx_errno, | |
| 624 ngx_close_file_n " \"%s\" failed", file->name); | |
| 625 } | |
| 626 | |
| 627 file->fd = NGX_INVALID_FILE; | |
| 628 } | |
| 629 | |
| 630 if (!file->close) { | |
| 631 return; | |
| 1453 | 632 } |
| 633 | |
| 634 ngx_free(file->name); | |
| 635 ngx_free(file); | |
| 636 } | |
| 637 | |
| 638 | |
| 639 static void | |
| 1775 | 640 ngx_open_file_del_event(ngx_cached_open_file_t *file) |
| 641 { | |
| 642 if (file->event == NULL) { | |
| 643 return; | |
| 644 } | |
| 645 | |
| 646 (void) ngx_del_event(file->event, NGX_VNODE_EVENT, | |
| 647 file->count ? NGX_FLUSH_EVENT : NGX_CLOSE_EVENT); | |
| 648 | |
| 649 ngx_free(file->event->data); | |
| 650 ngx_free(file->event); | |
| 651 file->event = NULL; | |
| 652 file->use_event = 0; | |
| 653 } | |
| 654 | |
| 655 | |
| 656 static void | |
| 1453 | 657 ngx_expire_old_cached_files(ngx_open_file_cache_t *cache, ngx_uint_t n, |
| 658 ngx_log_t *log) | |
| 659 { | |
| 660 time_t now; | |
| 1765 | 661 ngx_queue_t *q; |
| 1453 | 662 ngx_cached_open_file_t *file; |
| 663 | |
| 664 now = ngx_time(); | |
| 665 | |
| 666 /* | |
| 667 * n == 1 deletes one or two inactive files | |
| 668 * n == 0 deletes least recently used file by force | |
| 669 * and one or two inactive files | |
| 670 */ | |
| 671 | |
| 672 while (n < 3) { | |
| 673 | |
| 1765 | 674 if (ngx_queue_empty(&cache->expire_queue)) { |
| 1453 | 675 return; |
| 676 } | |
| 677 | |
| 1765 | 678 q = ngx_queue_last(&cache->expire_queue); |
| 679 | |
| 680 file = ngx_queue_data(q, ngx_cached_open_file_t, queue); | |
| 681 | |
| 1453 | 682 if (n++ != 0 && now - file->accessed <= cache->inactive) { |
| 683 return; | |
| 684 } | |
| 685 | |
| 1765 | 686 ngx_queue_remove(q); |
| 1453 | 687 |
| 688 ngx_rbtree_delete(&cache->rbtree, &file->node); | |
| 689 | |
| 690 cache->current--; | |
| 691 | |
| 692 ngx_log_debug1(NGX_LOG_DEBUG_CORE, log, 0, | |
| 693 "expire cached open file: %s", file->name); | |
| 694 | |
| 695 if (!file->err && !file->is_dir) { | |
| 696 file->close = 1; | |
| 1772 | 697 ngx_close_cached_file(cache, file, 0, log); |
| 1453 | 698 |
| 699 } else { | |
| 700 ngx_free(file->name); | |
| 701 ngx_free(file); | |
| 702 } | |
| 703 } | |
| 704 } | |
| 705 | |
| 706 | |
| 707 static void | |
| 708 ngx_open_file_cache_rbtree_insert_value(ngx_rbtree_node_t *temp, | |
| 709 ngx_rbtree_node_t *node, ngx_rbtree_node_t *sentinel) | |
| 710 { | |
| 711 ngx_rbtree_node_t **p; | |
| 712 ngx_cached_open_file_t *file, *file_temp; | |
| 713 | |
| 714 for ( ;; ) { | |
| 715 | |
| 716 if (node->key < temp->key) { | |
| 717 | |
| 718 p = &temp->left; | |
| 719 | |
| 720 } else if (node->key > temp->key) { | |
| 721 | |
| 722 p = &temp->right; | |
| 723 | |
| 724 } else { /* node->key == temp->key */ | |
| 725 | |
| 726 file = (ngx_cached_open_file_t *) node; | |
| 727 file_temp = (ngx_cached_open_file_t *) temp; | |
| 728 | |
| 729 p = (ngx_strcmp(file->name, file_temp->name) < 0) | |
| 730 ? &temp->left : &temp->right; | |
| 731 } | |
| 732 | |
| 733 if (*p == sentinel) { | |
| 734 break; | |
| 735 } | |
| 736 | |
| 737 temp = *p; | |
| 738 } | |
| 739 | |
| 740 *p = node; | |
| 741 node->parent = temp; | |
| 742 node->left = sentinel; | |
| 743 node->right = sentinel; | |
| 744 ngx_rbt_red(node); | |
| 745 } | |
| 746 | |
| 747 | |
| 1775 | 748 static ngx_cached_open_file_t * |
| 749 ngx_open_file_lookup(ngx_open_file_cache_t *cache, ngx_str_t *name, | |
| 750 uint32_t hash) | |
| 751 { | |
| 752 ngx_int_t rc; | |
| 753 ngx_rbtree_node_t *node, *sentinel; | |
| 754 ngx_cached_open_file_t *file; | |
| 755 | |
| 756 node = cache->rbtree.root; | |
| 757 sentinel = cache->rbtree.sentinel; | |
| 758 | |
| 759 while (node != sentinel) { | |
| 760 | |
| 761 if (hash < node->key) { | |
| 762 node = node->left; | |
| 763 continue; | |
| 764 } | |
| 765 | |
| 766 if (hash > node->key) { | |
| 767 node = node->right; | |
| 768 continue; | |
| 769 } | |
| 770 | |
| 771 /* hash == node->key */ | |
| 772 | |
| 773 do { | |
| 774 file = (ngx_cached_open_file_t *) node; | |
| 775 | |
| 776 rc = ngx_strcmp(name->data, file->name); | |
| 777 | |
| 778 if (rc == 0) { | |
| 779 return file; | |
| 780 } | |
| 781 | |
| 782 node = (rc < 0) ? node->left : node->right; | |
| 783 | |
| 784 } while (node != sentinel && hash == node->key); | |
| 785 | |
| 786 break; | |
| 787 } | |
| 788 | |
| 789 return NULL; | |
| 790 } | |
| 791 | |
| 792 | |
| 1453 | 793 static void |
| 794 ngx_open_file_cache_remove(ngx_event_t *ev) | |
| 795 { | |
| 796 ngx_cached_open_file_t *file; | |
| 797 ngx_open_file_cache_event_t *fev; | |
| 798 | |
| 799 fev = ev->data; | |
| 800 file = fev->file; | |
| 801 | |
| 1765 | 802 ngx_queue_remove(&file->queue); |
| 1453 | 803 |
| 804 ngx_rbtree_delete(&fev->cache->rbtree, &file->node); | |
| 805 | |
| 806 fev->cache->current--; | |
| 807 | |
| 808 /* NGX_ONESHOT_EVENT was already deleted */ | |
| 809 file->event = NULL; | |
| 810 | |
| 811 file->close = 1; | |
| 812 | |
| 1772 | 813 ngx_close_cached_file(fev->cache, file, 0, ev->log); |
| 1453 | 814 |
| 815 /* free memory only when fev->cache and fev->file are already not needed */ | |
| 816 | |
| 817 ngx_free(ev->data); | |
| 818 ngx_free(ev); | |
| 819 } |