Mercurial > hg > nginx
annotate src/core/ngx_open_file_cache.c @ 2071:2d216377146a
fix comment
| author | Igor Sysoev <igor@sysoev.ru> |
|---|---|
| date | Mon, 30 Jun 2008 12:12:16 +0000 |
| parents | 92402cc8b3cf |
| children | ee2fecdfdef7 |
| 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 | |
|
2069
23930ccd2642
use ngx_file_info() and test uniq if file is already open
Igor Sysoev <igor@sysoev.ru>
parents:
2063
diff
changeset
|
138 of->fd = NGX_INVALID_FILE; |
| 1453 | 139 of->err = 0; |
| 140 | |
| 141 if (cache == NULL) { | |
| 142 | |
| 143 cln = ngx_pool_cleanup_add(pool, sizeof(ngx_pool_cleanup_file_t)); | |
| 144 if (cln == NULL) { | |
| 145 return NGX_ERROR; | |
| 146 } | |
| 147 | |
| 148 rc = ngx_open_and_stat_file(name->data, of, pool->log); | |
| 149 | |
| 150 if (rc == NGX_OK && !of->is_dir) { | |
| 151 cln->handler = ngx_pool_cleanup_file; | |
| 152 clnf = cln->data; | |
| 153 | |
| 154 clnf->fd = of->fd; | |
| 155 clnf->name = name->data; | |
| 156 clnf->log = pool->log; | |
| 157 } | |
| 158 | |
| 159 return rc; | |
| 160 } | |
| 161 | |
| 162 cln = ngx_pool_cleanup_add(pool, sizeof(ngx_open_file_cache_cleanup_t)); | |
| 163 if (cln == NULL) { | |
| 164 return NGX_ERROR; | |
| 165 } | |
| 166 | |
| 167 now = ngx_time(); | |
| 168 | |
| 1775 | 169 hash = ngx_crc32_long(name->data, name->len); |
| 170 | |
| 171 file = ngx_open_file_lookup(cache, name, hash); | |
| 172 | |
| 173 if (file) { | |
| 174 | |
| 175 file->uses++; | |
| 176 | |
| 1987 | 177 ngx_queue_remove(&file->queue); |
| 178 | |
| 1775 | 179 if (file->fd == NGX_INVALID_FILE && file->err == 0 && !file->is_dir) { |
| 180 | |
| 181 /* file was not used often enough to keep open */ | |
| 182 | |
| 183 rc = ngx_open_and_stat_file(name->data, of, pool->log); | |
| 1453 | 184 |
| 1775 | 185 if (rc != NGX_OK && (of->err == 0 || !of->errors)) { |
| 186 goto failed; | |
| 187 } | |
| 188 | |
| 189 goto add_event; | |
| 1453 | 190 } |
| 191 | |
| 2070 | 192 if (file->use_event |
|
2063
67a29af877ed
initialize of.uniq in ngx_open_cached_file()
Igor Sysoev <igor@sysoev.ru>
parents:
2006
diff
changeset
|
193 || (file->event == NULL |
|
67a29af877ed
initialize of.uniq in ngx_open_cached_file()
Igor Sysoev <igor@sysoev.ru>
parents:
2006
diff
changeset
|
194 && (of->uniq == 0 || of->uniq == file->uniq) |
|
67a29af877ed
initialize of.uniq in ngx_open_cached_file()
Igor Sysoev <igor@sysoev.ru>
parents:
2006
diff
changeset
|
195 && now - file->created < of->valid)) |
| 1775 | 196 { |
| 197 if (file->err == 0) { | |
| 1772 | 198 |
| 1775 | 199 of->fd = file->fd; |
| 200 of->uniq = file->uniq; | |
| 201 of->mtime = file->mtime; | |
| 202 of->size = file->size; | |
| 1453 | 203 |
| 1775 | 204 of->is_dir = file->is_dir; |
| 205 of->is_file = file->is_file; | |
| 206 of->is_link = file->is_link; | |
| 207 of->is_exec = file->is_exec; | |
| 1453 | 208 |
| 1775 | 209 if (!file->is_dir) { |
| 210 file->count++; | |
| 211 ngx_open_file_add_event(cache, file, of, pool->log); | |
| 1453 | 212 } |
| 213 | |
| 1775 | 214 } else { |
| 215 of->err = file->err; | |
| 216 } | |
| 217 | |
| 218 goto found; | |
| 219 } | |
| 220 | |
| 221 ngx_log_debug4(NGX_LOG_DEBUG_CORE, pool->log, 0, | |
| 222 "retest open file: %s, fd:%d, c:%d, e:%d", | |
| 223 file->name, file->fd, file->count, file->err); | |
| 1453 | 224 |
| 1775 | 225 if (file->is_dir) { |
| 226 | |
| 227 /* | |
| 228 * chances that directory became file are very small | |
| 229 * so test_dir flag allows to use a single syscall | |
| 230 * in ngx_file_info() instead of three syscalls | |
| 231 */ | |
| 232 | |
| 233 of->test_dir = 1; | |
| 234 } | |
| 235 | |
|
2069
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use ngx_file_info() and test uniq if file is already open
Igor Sysoev <igor@sysoev.ru>
parents:
2063
diff
changeset
|
236 of->fd = file->fd; |
|
23930ccd2642
use ngx_file_info() and test uniq if file is already open
Igor Sysoev <igor@sysoev.ru>
parents:
2063
diff
changeset
|
237 of->uniq = file->uniq; |
|
23930ccd2642
use ngx_file_info() and test uniq if file is already open
Igor Sysoev <igor@sysoev.ru>
parents:
2063
diff
changeset
|
238 |
| 1775 | 239 rc = ngx_open_and_stat_file(name->data, of, pool->log); |
| 1453 | 240 |
| 1775 | 241 if (rc != NGX_OK && (of->err == 0 || !of->errors)) { |
| 242 goto failed; | |
| 243 } | |
| 244 | |
| 245 if (of->is_dir) { | |
| 246 | |
| 247 if (file->is_dir || file->err) { | |
| 248 goto update; | |
| 249 } | |
| 250 | |
| 251 /* file became directory */ | |
| 1453 | 252 |
| 1775 | 253 } else if (of->err == 0) { /* file */ |
| 254 | |
| 255 if (file->is_dir || file->err) { | |
| 256 goto add_event; | |
| 257 } | |
| 1453 | 258 |
| 2070 | 259 if (of->uniq == file->uniq) { |
| 1453 | 260 |
| 1775 | 261 file->count++; |
| 1453 | 262 |
| 1775 | 263 if (file->event) { |
| 264 file->use_event = 1; | |
| 1453 | 265 } |
| 266 | |
| 1775 | 267 goto renew; |
| 268 } | |
| 1453 | 269 |
| 1775 | 270 /* file was changed */ |
| 1453 | 271 |
| 1775 | 272 } else { /* error to cache */ |
| 1453 | 273 |
| 1775 | 274 if (file->err || file->is_dir) { |
| 275 goto update; | |
| 1453 | 276 } |
| 277 | |
| 1775 | 278 /* file was removed, etc. */ |
| 279 } | |
| 280 | |
| 281 if (file->count == 0) { | |
| 282 | |
| 283 ngx_open_file_del_event(file); | |
| 1453 | 284 |
| 1775 | 285 if (ngx_close_file(file->fd) == NGX_FILE_ERROR) { |
| 286 ngx_log_error(NGX_LOG_ALERT, pool->log, ngx_errno, | |
| 287 ngx_close_file_n " \"%s\" failed", | |
| 288 name->data); | |
| 289 } | |
| 1453 | 290 |
| 1775 | 291 goto add_event; |
| 292 } | |
| 293 | |
| 294 ngx_rbtree_delete(&cache->rbtree, &file->node); | |
| 295 | |
| 296 cache->current--; | |
| 297 | |
| 298 file->close = 1; | |
| 299 | |
| 300 goto create; | |
| 1453 | 301 } |
| 302 | |
| 303 /* not found */ | |
| 304 | |
| 305 rc = ngx_open_and_stat_file(name->data, of, pool->log); | |
| 306 | |
| 307 if (rc != NGX_OK && (of->err == 0 || !of->errors)) { | |
| 308 goto failed; | |
| 309 } | |
| 310 | |
| 311 create: | |
| 312 | |
| 313 if (cache->current >= cache->max) { | |
| 314 ngx_expire_old_cached_files(cache, 0, pool->log); | |
| 315 } | |
| 316 | |
| 317 file = ngx_alloc(sizeof(ngx_cached_open_file_t), pool->log); | |
| 318 | |
| 319 if (file == NULL) { | |
| 320 goto failed; | |
| 321 } | |
| 322 | |
| 323 file->name = ngx_alloc(name->len + 1, pool->log); | |
| 324 | |
| 325 if (file->name == NULL) { | |
| 326 ngx_free(file); | |
| 327 file = NULL; | |
| 328 goto failed; | |
| 329 } | |
| 330 | |
| 331 ngx_cpystrn(file->name, name->data, name->len + 1); | |
| 332 | |
| 333 file->node.key = hash; | |
| 334 | |
| 335 ngx_rbtree_insert(&cache->rbtree, &file->node); | |
| 336 | |
| 337 cache->current++; | |
| 338 | |
| 1775 | 339 file->uses = 1; |
| 1453 | 340 file->count = 0; |
| 1775 | 341 file->event = NULL; |
| 342 | |
| 343 add_event: | |
| 344 | |
| 345 ngx_open_file_add_event(cache, file, of, pool->log); | |
| 1453 | 346 |
| 347 update: | |
| 348 | |
| 349 file->fd = of->fd; | |
| 350 file->err = of->err; | |
| 351 | |
| 352 if (of->err == 0) { | |
| 353 file->uniq = of->uniq; | |
| 354 file->mtime = of->mtime; | |
| 355 file->size = of->size; | |
| 356 | |
| 357 file->close = 0; | |
| 358 | |
| 359 file->is_dir = of->is_dir; | |
| 360 file->is_file = of->is_file; | |
| 361 file->is_link = of->is_link; | |
| 362 file->is_exec = of->is_exec; | |
| 363 | |
| 364 if (!of->is_dir) { | |
| 365 file->count++; | |
| 366 } | |
| 367 } | |
| 368 | |
| 369 renew: | |
| 370 | |
| 371 file->created = now; | |
| 372 | |
| 373 found: | |
| 374 | |
| 375 file->accessed = now; | |
| 376 | |
| 1765 | 377 ngx_queue_insert_head(&cache->expire_queue, &file->queue); |
| 1453 | 378 |
| 1772 | 379 ngx_log_debug5(NGX_LOG_DEBUG_CORE, pool->log, 0, |
| 380 "cached open file: %s, fd:%d, c:%d, e:%d, u:%d", | |
| 381 file->name, file->fd, file->count, file->err, file->uses); | |
| 1453 | 382 |
| 383 if (of->err == 0) { | |
| 384 | |
| 385 if (!of->is_dir) { | |
| 386 cln->handler = ngx_open_file_cleanup; | |
| 387 ofcln = cln->data; | |
| 388 | |
| 389 ofcln->cache = cache; | |
| 390 ofcln->file = file; | |
| 1772 | 391 ofcln->min_uses = of->min_uses; |
| 1453 | 392 ofcln->log = pool->log; |
| 393 } | |
| 394 | |
| 395 return NGX_OK; | |
| 396 } | |
| 397 | |
| 398 return NGX_ERROR; | |
| 399 | |
| 400 failed: | |
| 401 | |
|
1988
34051c712e41
fix segfault when file is deleted and open_file_cache_errors is off
Igor Sysoev <igor@sysoev.ru>
parents:
1987
diff
changeset
|
402 if (file) { |
| 1453 | 403 ngx_rbtree_delete(&cache->rbtree, &file->node); |
| 404 | |
| 405 cache->current--; | |
| 406 | |
|
1988
34051c712e41
fix segfault when file is deleted and open_file_cache_errors is off
Igor Sysoev <igor@sysoev.ru>
parents:
1987
diff
changeset
|
407 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
|
408 |
|
2006
b52cb9bf2064
style fix: remove tabs and trailing spaces
Igor Sysoev <igor@sysoev.ru>
parents:
1988
diff
changeset
|
409 if (file->fd != NGX_INVALID_FILE) { |
|
b52cb9bf2064
style fix: remove tabs and trailing spaces
Igor Sysoev <igor@sysoev.ru>
parents:
1988
diff
changeset
|
410 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
|
411 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
|
412 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
|
413 file->name); |
|
2006
b52cb9bf2064
style fix: remove tabs and trailing spaces
Igor Sysoev <igor@sysoev.ru>
parents:
1988
diff
changeset
|
414 } |
|
b52cb9bf2064
style fix: remove tabs and trailing spaces
Igor Sysoev <igor@sysoev.ru>
parents:
1988
diff
changeset
|
415 } |
|
1988
34051c712e41
fix segfault when file is deleted and open_file_cache_errors is off
Igor Sysoev <igor@sysoev.ru>
parents:
1987
diff
changeset
|
416 |
|
34051c712e41
fix segfault when file is deleted and open_file_cache_errors is off
Igor Sysoev <igor@sysoev.ru>
parents:
1987
diff
changeset
|
417 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
|
418 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
|
419 |
|
34051c712e41
fix segfault when file is deleted and open_file_cache_errors is off
Igor Sysoev <igor@sysoev.ru>
parents:
1987
diff
changeset
|
420 } else { |
|
34051c712e41
fix segfault when file is deleted and open_file_cache_errors is off
Igor Sysoev <igor@sysoev.ru>
parents:
1987
diff
changeset
|
421 file->close = 1; |
| 1453 | 422 } |
| 423 } | |
| 424 | |
| 425 if (of->fd != NGX_INVALID_FILE) { | |
| 426 if (ngx_close_file(of->fd) == NGX_FILE_ERROR) { | |
| 427 ngx_log_error(NGX_LOG_ALERT, pool->log, ngx_errno, | |
| 428 ngx_close_file_n " \"%s\" failed", name->data); | |
| 429 } | |
| 430 } | |
| 431 | |
| 432 return NGX_ERROR; | |
| 433 } | |
| 434 | |
| 435 | |
| 436 static ngx_int_t | |
| 437 ngx_open_and_stat_file(u_char *name, ngx_open_file_info_t *of, ngx_log_t *log) | |
| 438 { | |
| 439 ngx_fd_t fd; | |
| 440 ngx_file_info_t fi; | |
| 441 | |
| 2070 | 442 if (of->fd != NGX_INVALID_FILE) { |
| 1453 | 443 |
| 444 if (ngx_file_info(name, &fi) == -1) { | |
|
2069
23930ccd2642
use ngx_file_info() and test uniq if file is already open
Igor Sysoev <igor@sysoev.ru>
parents:
2063
diff
changeset
|
445 goto failed; |
| 1453 | 446 } |
| 447 | |
| 2070 | 448 if (of->uniq == ngx_file_uniq(&fi)) { |
|
2069
23930ccd2642
use ngx_file_info() and test uniq if file is already open
Igor Sysoev <igor@sysoev.ru>
parents:
2063
diff
changeset
|
449 goto done; |
|
23930ccd2642
use ngx_file_info() and test uniq if file is already open
Igor Sysoev <igor@sysoev.ru>
parents:
2063
diff
changeset
|
450 } |
| 1453 | 451 |
| 2070 | 452 } else if (of->test_dir) { |
| 453 | |
| 454 if (ngx_file_info(name, &fi) == -1) { | |
| 455 goto failed; | |
| 456 } | |
| 457 | |
| 458 if (of->is_dir) { | |
|
2069
23930ccd2642
use ngx_file_info() and test uniq if file is already open
Igor Sysoev <igor@sysoev.ru>
parents:
2063
diff
changeset
|
459 goto done; |
| 1453 | 460 } |
| 461 } | |
| 462 | |
| 463 fd = ngx_open_file(name, NGX_FILE_RDONLY, NGX_FILE_OPEN, 0); | |
| 464 | |
| 465 if (fd == NGX_INVALID_FILE) { | |
|
2069
23930ccd2642
use ngx_file_info() and test uniq if file is already open
Igor Sysoev <igor@sysoev.ru>
parents:
2063
diff
changeset
|
466 goto failed; |
| 1453 | 467 } |
| 468 | |
| 469 if (ngx_fd_info(fd, &fi) == NGX_FILE_ERROR) { | |
| 470 ngx_log_error(NGX_LOG_CRIT, log, ngx_errno, | |
| 471 ngx_fd_info_n " \"%s\" failed", name); | |
| 472 | |
| 473 if (ngx_close_file(fd) == NGX_FILE_ERROR) { | |
| 474 ngx_log_error(NGX_LOG_ALERT, log, ngx_errno, | |
| 475 ngx_close_file_n " \"%s\" failed", name); | |
| 476 } | |
| 477 | |
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478 of->fd = NGX_INVALID_FILE; |
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479 |
| 1453 | 480 return NGX_ERROR; |
| 481 } | |
| 482 | |
| 483 if (ngx_is_dir(&fi)) { | |
| 484 if (ngx_close_file(fd) == NGX_FILE_ERROR) { | |
| 485 ngx_log_error(NGX_LOG_ALERT, log, ngx_errno, | |
| 486 ngx_close_file_n " \"%s\" failed", name); | |
| 487 } | |
| 488 | |
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489 of->fd = NGX_INVALID_FILE; |
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490 |
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491 } else { |
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492 of->fd = fd; |
| 1453 | 493 } |
| 494 | |
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495 done: |
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496 |
| 1453 | 497 of->uniq = ngx_file_uniq(&fi); |
| 498 of->mtime = ngx_file_mtime(&fi); | |
| 499 of->size = ngx_file_size(&fi); | |
| 500 of->is_dir = ngx_is_dir(&fi); | |
| 501 of->is_file = ngx_is_file(&fi); | |
| 502 of->is_link = ngx_is_link(&fi); | |
| 503 of->is_exec = ngx_is_exec(&fi); | |
| 504 | |
| 505 return NGX_OK; | |
|
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506 |
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507 failed: |
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508 |
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509 of->fd = NGX_INVALID_FILE; |
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510 of->err = ngx_errno; |
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511 |
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512 return NGX_ERROR; |
| 1453 | 513 } |
| 514 | |
| 515 | |
| 1775 | 516 /* |
| 517 * we ignore any possible event setting error and | |
| 518 * fallback to usual periodic file retests | |
| 519 */ | |
| 520 | |
| 521 static void | |
| 522 ngx_open_file_add_event(ngx_open_file_cache_t *cache, | |
| 523 ngx_cached_open_file_t *file, ngx_open_file_info_t *of, ngx_log_t *log) | |
| 524 { | |
| 525 ngx_open_file_cache_event_t *fev; | |
| 526 | |
| 527 if (!(ngx_event_flags & NGX_USE_VNODE_EVENT) | |
| 528 || !of->events | |
| 529 || file->event | |
| 530 || of->fd == NGX_INVALID_FILE | |
| 531 || file->uses < of->min_uses) | |
| 532 { | |
| 533 return; | |
| 534 } | |
| 535 | |
| 2070 | 536 file->use_event = 0; |
| 537 | |
| 1775 | 538 file->event = ngx_calloc(sizeof(ngx_event_t), log); |
| 539 if (file->event== NULL) { | |
| 540 return; | |
| 541 } | |
| 542 | |
| 543 fev = ngx_alloc(sizeof(ngx_open_file_cache_event_t), log); | |
| 544 if (fev == NULL) { | |
| 545 ngx_free(file->event); | |
| 546 file->event = NULL; | |
| 547 return; | |
| 548 } | |
| 549 | |
| 550 fev->fd = of->fd; | |
| 551 fev->file = file; | |
| 552 fev->cache = cache; | |
| 553 | |
| 554 file->event->handler = ngx_open_file_cache_remove; | |
| 555 file->event->data = fev; | |
| 556 | |
| 557 /* | |
| 558 * although vnode event may be called while ngx_cycle->poll | |
| 559 * destruction, however, cleanup procedures are run before any | |
| 560 * memory freeing and events will be canceled. | |
| 561 */ | |
| 562 | |
| 563 file->event->log = ngx_cycle->log; | |
| 564 | |
| 565 if (ngx_add_event(file->event, NGX_VNODE_EVENT, NGX_ONESHOT_EVENT) | |
| 566 != NGX_OK) | |
| 567 { | |
| 568 ngx_free(file->event->data); | |
| 569 ngx_free(file->event); | |
| 570 file->event = NULL; | |
| 571 return; | |
| 572 } | |
| 573 | |
| 574 /* | |
| 2071 | 575 * we do not set file->use_event here because there may be a race |
| 576 * condition: a file may be deleted between opening the file and | |
| 577 * adding event, so we rely upon event notification only after | |
| 578 * one file revalidation on next file access | |
| 1775 | 579 */ |
| 580 | |
| 581 return; | |
| 582 } | |
| 583 | |
| 584 | |
| 1453 | 585 static void |
| 586 ngx_open_file_cleanup(void *data) | |
| 587 { | |
| 588 ngx_open_file_cache_cleanup_t *c = data; | |
| 589 | |
| 590 c->file->count--; | |
| 591 | |
| 1772 | 592 ngx_close_cached_file(c->cache, c->file, c->min_uses, c->log); |
| 1453 | 593 |
| 594 /* drop one or two expired open files */ | |
| 595 ngx_expire_old_cached_files(c->cache, 1, c->log); | |
| 596 } | |
| 597 | |
| 598 | |
| 599 static void | |
| 600 ngx_close_cached_file(ngx_open_file_cache_t *cache, | |
| 1772 | 601 ngx_cached_open_file_t *file, ngx_uint_t min_uses, ngx_log_t *log) |
| 1453 | 602 { |
| 1772 | 603 ngx_log_debug5(NGX_LOG_DEBUG_CORE, log, 0, |
| 604 "close cached open file: %s, fd:%d, c:%d, u:%d, %d", | |
| 605 file->name, file->fd, file->count, file->uses, file->close); | |
| 1453 | 606 |
| 607 if (!file->close) { | |
| 608 | |
| 609 file->accessed = ngx_time(); | |
| 610 | |
| 1765 | 611 ngx_queue_remove(&file->queue); |
| 1453 | 612 |
| 1765 | 613 ngx_queue_insert_head(&cache->expire_queue, &file->queue); |
| 1453 | 614 |
| 1772 | 615 if (file->uses >= min_uses || file->count) { |
| 616 return; | |
| 617 } | |
| 1453 | 618 } |
| 619 | |
| 1775 | 620 ngx_open_file_del_event(file); |
| 1453 | 621 |
| 622 if (file->count) { | |
| 623 return; | |
| 624 } | |
| 625 | |
| 1772 | 626 if (file->fd != NGX_INVALID_FILE) { |
| 627 | |
| 628 if (ngx_close_file(file->fd) == NGX_FILE_ERROR) { | |
| 629 ngx_log_error(NGX_LOG_ALERT, log, ngx_errno, | |
| 630 ngx_close_file_n " \"%s\" failed", file->name); | |
| 631 } | |
| 632 | |
| 633 file->fd = NGX_INVALID_FILE; | |
| 634 } | |
| 635 | |
| 636 if (!file->close) { | |
| 637 return; | |
| 1453 | 638 } |
| 639 | |
| 640 ngx_free(file->name); | |
| 641 ngx_free(file); | |
| 642 } | |
| 643 | |
| 644 | |
| 645 static void | |
| 1775 | 646 ngx_open_file_del_event(ngx_cached_open_file_t *file) |
| 647 { | |
| 648 if (file->event == NULL) { | |
| 649 return; | |
| 650 } | |
| 651 | |
| 652 (void) ngx_del_event(file->event, NGX_VNODE_EVENT, | |
| 653 file->count ? NGX_FLUSH_EVENT : NGX_CLOSE_EVENT); | |
| 654 | |
| 655 ngx_free(file->event->data); | |
| 656 ngx_free(file->event); | |
| 657 file->event = NULL; | |
| 658 file->use_event = 0; | |
| 659 } | |
| 660 | |
| 661 | |
| 662 static void | |
| 1453 | 663 ngx_expire_old_cached_files(ngx_open_file_cache_t *cache, ngx_uint_t n, |
| 664 ngx_log_t *log) | |
| 665 { | |
| 666 time_t now; | |
| 1765 | 667 ngx_queue_t *q; |
| 1453 | 668 ngx_cached_open_file_t *file; |
| 669 | |
| 670 now = ngx_time(); | |
| 671 | |
| 672 /* | |
| 673 * n == 1 deletes one or two inactive files | |
| 674 * n == 0 deletes least recently used file by force | |
| 675 * and one or two inactive files | |
| 676 */ | |
| 677 | |
| 678 while (n < 3) { | |
| 679 | |
| 1765 | 680 if (ngx_queue_empty(&cache->expire_queue)) { |
| 1453 | 681 return; |
| 682 } | |
| 683 | |
| 1765 | 684 q = ngx_queue_last(&cache->expire_queue); |
| 685 | |
| 686 file = ngx_queue_data(q, ngx_cached_open_file_t, queue); | |
| 687 | |
| 1453 | 688 if (n++ != 0 && now - file->accessed <= cache->inactive) { |
| 689 return; | |
| 690 } | |
| 691 | |
| 1765 | 692 ngx_queue_remove(q); |
| 1453 | 693 |
| 694 ngx_rbtree_delete(&cache->rbtree, &file->node); | |
| 695 | |
| 696 cache->current--; | |
| 697 | |
| 698 ngx_log_debug1(NGX_LOG_DEBUG_CORE, log, 0, | |
| 699 "expire cached open file: %s", file->name); | |
| 700 | |
| 701 if (!file->err && !file->is_dir) { | |
| 702 file->close = 1; | |
| 1772 | 703 ngx_close_cached_file(cache, file, 0, log); |
| 1453 | 704 |
| 705 } else { | |
| 706 ngx_free(file->name); | |
| 707 ngx_free(file); | |
| 708 } | |
| 709 } | |
| 710 } | |
| 711 | |
| 712 | |
| 713 static void | |
| 714 ngx_open_file_cache_rbtree_insert_value(ngx_rbtree_node_t *temp, | |
| 715 ngx_rbtree_node_t *node, ngx_rbtree_node_t *sentinel) | |
| 716 { | |
| 717 ngx_rbtree_node_t **p; | |
| 718 ngx_cached_open_file_t *file, *file_temp; | |
| 719 | |
| 720 for ( ;; ) { | |
| 721 | |
| 722 if (node->key < temp->key) { | |
| 723 | |
| 724 p = &temp->left; | |
| 725 | |
| 726 } else if (node->key > temp->key) { | |
| 727 | |
| 728 p = &temp->right; | |
| 729 | |
| 730 } else { /* node->key == temp->key */ | |
| 731 | |
| 732 file = (ngx_cached_open_file_t *) node; | |
| 733 file_temp = (ngx_cached_open_file_t *) temp; | |
| 734 | |
| 735 p = (ngx_strcmp(file->name, file_temp->name) < 0) | |
| 736 ? &temp->left : &temp->right; | |
| 737 } | |
| 738 | |
| 739 if (*p == sentinel) { | |
| 740 break; | |
| 741 } | |
| 742 | |
| 743 temp = *p; | |
| 744 } | |
| 745 | |
| 746 *p = node; | |
| 747 node->parent = temp; | |
| 748 node->left = sentinel; | |
| 749 node->right = sentinel; | |
| 750 ngx_rbt_red(node); | |
| 751 } | |
| 752 | |
| 753 | |
| 1775 | 754 static ngx_cached_open_file_t * |
| 755 ngx_open_file_lookup(ngx_open_file_cache_t *cache, ngx_str_t *name, | |
| 756 uint32_t hash) | |
| 757 { | |
| 758 ngx_int_t rc; | |
| 759 ngx_rbtree_node_t *node, *sentinel; | |
| 760 ngx_cached_open_file_t *file; | |
| 761 | |
| 762 node = cache->rbtree.root; | |
| 763 sentinel = cache->rbtree.sentinel; | |
| 764 | |
| 765 while (node != sentinel) { | |
| 766 | |
| 767 if (hash < node->key) { | |
| 768 node = node->left; | |
| 769 continue; | |
| 770 } | |
| 771 | |
| 772 if (hash > node->key) { | |
| 773 node = node->right; | |
| 774 continue; | |
| 775 } | |
| 776 | |
| 777 /* hash == node->key */ | |
| 778 | |
| 779 do { | |
| 780 file = (ngx_cached_open_file_t *) node; | |
| 781 | |
| 782 rc = ngx_strcmp(name->data, file->name); | |
| 783 | |
| 784 if (rc == 0) { | |
| 785 return file; | |
| 786 } | |
| 787 | |
| 788 node = (rc < 0) ? node->left : node->right; | |
| 789 | |
| 790 } while (node != sentinel && hash == node->key); | |
| 791 | |
| 792 break; | |
| 793 } | |
| 794 | |
| 795 return NULL; | |
| 796 } | |
| 797 | |
| 798 | |
| 1453 | 799 static void |
| 800 ngx_open_file_cache_remove(ngx_event_t *ev) | |
| 801 { | |
| 802 ngx_cached_open_file_t *file; | |
| 803 ngx_open_file_cache_event_t *fev; | |
| 804 | |
| 805 fev = ev->data; | |
| 806 file = fev->file; | |
| 807 | |
| 1765 | 808 ngx_queue_remove(&file->queue); |
| 1453 | 809 |
| 810 ngx_rbtree_delete(&fev->cache->rbtree, &file->node); | |
| 811 | |
| 812 fev->cache->current--; | |
| 813 | |
| 814 /* NGX_ONESHOT_EVENT was already deleted */ | |
| 815 file->event = NULL; | |
| 2070 | 816 file->use_event = 0; |
| 1453 | 817 |
| 818 file->close = 1; | |
| 819 | |
| 1772 | 820 ngx_close_cached_file(fev->cache, file, 0, ev->log); |
| 1453 | 821 |
| 822 /* free memory only when fev->cache and fev->file are already not needed */ | |
| 823 | |
| 824 ngx_free(ev->data); | |
| 825 ngx_free(ev); | |
| 826 } |