diff options
Diffstat (limited to 'app/nginx/src/core/ngx_open_file_cache.c')
| -rw-r--r-- | app/nginx/src/core/ngx_open_file_cache.c | 1253 |
1 files changed, 0 insertions, 1253 deletions
diff --git a/app/nginx/src/core/ngx_open_file_cache.c b/app/nginx/src/core/ngx_open_file_cache.c deleted file mode 100644 index b23ee78..0000000 --- a/app/nginx/src/core/ngx_open_file_cache.c +++ /dev/null @@ -1,1253 +0,0 @@ - -/* - * Copyright (C) Igor Sysoev - * Copyright (C) Nginx, Inc. - */ - - -#include <ngx_config.h> -#include <ngx_core.h> -#include <ngx_event.h> - - -/* - * open file cache caches - * open file handles with stat() info; - * directories stat() info; - * files and directories errors: not found, access denied, etc. - */ - - -#define NGX_MIN_READ_AHEAD (128 * 1024) - - -static void ngx_open_file_cache_cleanup(void *data); -#if (NGX_HAVE_OPENAT) -static ngx_fd_t ngx_openat_file_owner(ngx_fd_t at_fd, const u_char *name, - ngx_int_t mode, ngx_int_t create, ngx_int_t access, ngx_log_t *log); -#if (NGX_HAVE_O_PATH) -static ngx_int_t ngx_file_o_path_info(ngx_fd_t fd, ngx_file_info_t *fi, - ngx_log_t *log); -#endif -#endif -static ngx_fd_t ngx_open_file_wrapper(ngx_str_t *name, - ngx_open_file_info_t *of, ngx_int_t mode, ngx_int_t create, - ngx_int_t access, ngx_log_t *log); -static ngx_int_t ngx_file_info_wrapper(ngx_str_t *name, - ngx_open_file_info_t *of, ngx_file_info_t *fi, ngx_log_t *log); -static ngx_int_t ngx_open_and_stat_file(ngx_str_t *name, - ngx_open_file_info_t *of, ngx_log_t *log); -static void ngx_open_file_add_event(ngx_open_file_cache_t *cache, - ngx_cached_open_file_t *file, ngx_open_file_info_t *of, ngx_log_t *log); -static void ngx_open_file_cleanup(void *data); -static void ngx_close_cached_file(ngx_open_file_cache_t *cache, - ngx_cached_open_file_t *file, ngx_uint_t min_uses, ngx_log_t *log); -static void ngx_open_file_del_event(ngx_cached_open_file_t *file); -static void ngx_expire_old_cached_files(ngx_open_file_cache_t *cache, - ngx_uint_t n, ngx_log_t *log); -static void ngx_open_file_cache_rbtree_insert_value(ngx_rbtree_node_t *temp, - ngx_rbtree_node_t *node, ngx_rbtree_node_t *sentinel); -static ngx_cached_open_file_t * - ngx_open_file_lookup(ngx_open_file_cache_t *cache, ngx_str_t *name, - uint32_t hash); -static void ngx_open_file_cache_remove(ngx_event_t *ev); - - -ngx_open_file_cache_t * -ngx_open_file_cache_init(ngx_pool_t *pool, ngx_uint_t max, time_t inactive) -{ - ngx_pool_cleanup_t *cln; - ngx_open_file_cache_t *cache; - - cache = ngx_palloc(pool, sizeof(ngx_open_file_cache_t)); - if (cache == NULL) { - return NULL; - } - - ngx_rbtree_init(&cache->rbtree, &cache->sentinel, - ngx_open_file_cache_rbtree_insert_value); - - ngx_queue_init(&cache->expire_queue); - - cache->current = 0; - cache->max = max; - cache->inactive = inactive; - - cln = ngx_pool_cleanup_add(pool, 0); - if (cln == NULL) { - return NULL; - } - - cln->handler = ngx_open_file_cache_cleanup; - cln->data = cache; - - return cache; -} - - -static void -ngx_open_file_cache_cleanup(void *data) -{ - ngx_open_file_cache_t *cache = data; - - ngx_queue_t *q; - ngx_cached_open_file_t *file; - - ngx_log_debug0(NGX_LOG_DEBUG_CORE, ngx_cycle->log, 0, - "open file cache cleanup"); - - for ( ;; ) { - - if (ngx_queue_empty(&cache->expire_queue)) { - break; - } - - q = ngx_queue_last(&cache->expire_queue); - - file = ngx_queue_data(q, ngx_cached_open_file_t, queue); - - ngx_queue_remove(q); - - ngx_rbtree_delete(&cache->rbtree, &file->node); - - cache->current--; - - ngx_log_debug1(NGX_LOG_DEBUG_CORE, ngx_cycle->log, 0, - "delete cached open file: %s", file->name); - - if (!file->err && !file->is_dir) { - file->close = 1; - file->count = 0; - ngx_close_cached_file(cache, file, 0, ngx_cycle->log); - - } else { - ngx_free(file->name); - ngx_free(file); - } - } - - if (cache->current) { - ngx_log_error(NGX_LOG_ALERT, ngx_cycle->log, 0, - "%ui items still left in open file cache", - cache->current); - } - - if (cache->rbtree.root != cache->rbtree.sentinel) { - ngx_log_error(NGX_LOG_ALERT, ngx_cycle->log, 0, - "rbtree still is not empty in open file cache"); - - } -} - - -ngx_int_t -ngx_open_cached_file(ngx_open_file_cache_t *cache, ngx_str_t *name, - ngx_open_file_info_t *of, ngx_pool_t *pool) -{ - time_t now; - uint32_t hash; - ngx_int_t rc; - ngx_file_info_t fi; - ngx_pool_cleanup_t *cln; - ngx_cached_open_file_t *file; - ngx_pool_cleanup_file_t *clnf; - ngx_open_file_cache_cleanup_t *ofcln; - - of->fd = NGX_INVALID_FILE; - of->err = 0; - - if (cache == NULL) { - - if (of->test_only) { - - if (ngx_file_info_wrapper(name, of, &fi, pool->log) - == NGX_FILE_ERROR) - { - return NGX_ERROR; - } - - of->uniq = ngx_file_uniq(&fi); - of->mtime = ngx_file_mtime(&fi); - of->size = ngx_file_size(&fi); - of->fs_size = ngx_file_fs_size(&fi); - of->is_dir = ngx_is_dir(&fi); - of->is_file = ngx_is_file(&fi); - of->is_link = ngx_is_link(&fi); - of->is_exec = ngx_is_exec(&fi); - - return NGX_OK; - } - - cln = ngx_pool_cleanup_add(pool, sizeof(ngx_pool_cleanup_file_t)); - if (cln == NULL) { - return NGX_ERROR; - } - - rc = ngx_open_and_stat_file(name, of, pool->log); - - if (rc == NGX_OK && !of->is_dir) { - cln->handler = ngx_pool_cleanup_file; - clnf = cln->data; - - clnf->fd = of->fd; - clnf->name = name->data; - clnf->log = pool->log; - } - - return rc; - } - - cln = ngx_pool_cleanup_add(pool, sizeof(ngx_open_file_cache_cleanup_t)); - if (cln == NULL) { - return NGX_ERROR; - } - - now = ngx_time(); - - hash = ngx_crc32_long(name->data, name->len); - - file = ngx_open_file_lookup(cache, name, hash); - - if (file) { - - file->uses++; - - ngx_queue_remove(&file->queue); - - if (file->fd == NGX_INVALID_FILE && file->err == 0 && !file->is_dir) { - - /* file was not used often enough to keep open */ - - rc = ngx_open_and_stat_file(name, of, pool->log); - - if (rc != NGX_OK && (of->err == 0 || !of->errors)) { - goto failed; - } - - goto add_event; - } - - if (file->use_event - || (file->event == NULL - && (of->uniq == 0 || of->uniq == file->uniq) - && now - file->created < of->valid -#if (NGX_HAVE_OPENAT) - && of->disable_symlinks == file->disable_symlinks - && of->disable_symlinks_from == file->disable_symlinks_from -#endif - )) - { - if (file->err == 0) { - - of->fd = file->fd; - of->uniq = file->uniq; - of->mtime = file->mtime; - of->size = file->size; - - of->is_dir = file->is_dir; - of->is_file = file->is_file; - of->is_link = file->is_link; - of->is_exec = file->is_exec; - of->is_directio = file->is_directio; - - if (!file->is_dir) { - file->count++; - ngx_open_file_add_event(cache, file, of, pool->log); - } - - } else { - of->err = file->err; -#if (NGX_HAVE_OPENAT) - of->failed = file->disable_symlinks ? ngx_openat_file_n - : ngx_open_file_n; -#else - of->failed = ngx_open_file_n; -#endif - } - - goto found; - } - - ngx_log_debug4(NGX_LOG_DEBUG_CORE, pool->log, 0, - "retest open file: %s, fd:%d, c:%d, e:%d", - file->name, file->fd, file->count, file->err); - - if (file->is_dir) { - - /* - * chances that directory became file are very small - * so test_dir flag allows to use a single syscall - * in ngx_file_info() instead of three syscalls - */ - - of->test_dir = 1; - } - - of->fd = file->fd; - of->uniq = file->uniq; - - rc = ngx_open_and_stat_file(name, of, pool->log); - - if (rc != NGX_OK && (of->err == 0 || !of->errors)) { - goto failed; - } - - if (of->is_dir) { - - if (file->is_dir || file->err) { - goto update; - } - - /* file became directory */ - - } else if (of->err == 0) { /* file */ - - if (file->is_dir || file->err) { - goto add_event; - } - - if (of->uniq == file->uniq) { - - if (file->event) { - file->use_event = 1; - } - - of->is_directio = file->is_directio; - - goto update; - } - - /* file was changed */ - - } else { /* error to cache */ - - if (file->err || file->is_dir) { - goto update; - } - - /* file was removed, etc. */ - } - - if (file->count == 0) { - - ngx_open_file_del_event(file); - - if (ngx_close_file(file->fd) == NGX_FILE_ERROR) { - ngx_log_error(NGX_LOG_ALERT, pool->log, ngx_errno, - ngx_close_file_n " \"%V\" failed", name); - } - - goto add_event; - } - - ngx_rbtree_delete(&cache->rbtree, &file->node); - - cache->current--; - - file->close = 1; - - goto create; - } - - /* not found */ - - rc = ngx_open_and_stat_file(name, of, pool->log); - - if (rc != NGX_OK && (of->err == 0 || !of->errors)) { - goto failed; - } - -create: - - if (cache->current >= cache->max) { - ngx_expire_old_cached_files(cache, 0, pool->log); - } - - file = ngx_alloc(sizeof(ngx_cached_open_file_t), pool->log); - - if (file == NULL) { - goto failed; - } - - file->name = ngx_alloc(name->len + 1, pool->log); - - if (file->name == NULL) { - ngx_free(file); - file = NULL; - goto failed; - } - - ngx_cpystrn(file->name, name->data, name->len + 1); - - file->node.key = hash; - - ngx_rbtree_insert(&cache->rbtree, &file->node); - - cache->current++; - - file->uses = 1; - file->count = 0; - file->use_event = 0; - file->event = NULL; - -add_event: - - ngx_open_file_add_event(cache, file, of, pool->log); - -update: - - file->fd = of->fd; - file->err = of->err; -#if (NGX_HAVE_OPENAT) - file->disable_symlinks = of->disable_symlinks; - file->disable_symlinks_from = of->disable_symlinks_from; -#endif - - if (of->err == 0) { - file->uniq = of->uniq; - file->mtime = of->mtime; - file->size = of->size; - - file->close = 0; - - file->is_dir = of->is_dir; - file->is_file = of->is_file; - file->is_link = of->is_link; - file->is_exec = of->is_exec; - file->is_directio = of->is_directio; - - if (!of->is_dir) { - file->count++; - } - } - - file->created = now; - -found: - - file->accessed = now; - - ngx_queue_insert_head(&cache->expire_queue, &file->queue); - - ngx_log_debug5(NGX_LOG_DEBUG_CORE, pool->log, 0, - "cached open file: %s, fd:%d, c:%d, e:%d, u:%d", - file->name, file->fd, file->count, file->err, file->uses); - - if (of->err == 0) { - - if (!of->is_dir) { - cln->handler = ngx_open_file_cleanup; - ofcln = cln->data; - - ofcln->cache = cache; - ofcln->file = file; - ofcln->min_uses = of->min_uses; - ofcln->log = pool->log; - } - - return NGX_OK; - } - - return NGX_ERROR; - -failed: - - if (file) { - ngx_rbtree_delete(&cache->rbtree, &file->node); - - cache->current--; - - if (file->count == 0) { - - if (file->fd != NGX_INVALID_FILE) { - if (ngx_close_file(file->fd) == NGX_FILE_ERROR) { - ngx_log_error(NGX_LOG_ALERT, pool->log, ngx_errno, - ngx_close_file_n " \"%s\" failed", - file->name); - } - } - - ngx_free(file->name); - ngx_free(file); - - } else { - file->close = 1; - } - } - - if (of->fd != NGX_INVALID_FILE) { - if (ngx_close_file(of->fd) == NGX_FILE_ERROR) { - ngx_log_error(NGX_LOG_ALERT, pool->log, ngx_errno, - ngx_close_file_n " \"%V\" failed", name); - } - } - - return NGX_ERROR; -} - - -#if (NGX_HAVE_OPENAT) - -static ngx_fd_t -ngx_openat_file_owner(ngx_fd_t at_fd, const u_char *name, - ngx_int_t mode, ngx_int_t create, ngx_int_t access, ngx_log_t *log) -{ - ngx_fd_t fd; - ngx_err_t err; - ngx_file_info_t fi, atfi; - - /* - * To allow symlinks with the same owner, use openat() (followed - * by fstat()) and fstatat(AT_SYMLINK_NOFOLLOW), and then compare - * uids between fstat() and fstatat(). - * - * As there is a race between openat() and fstatat() we don't - * know if openat() in fact opened symlink or not. Therefore, - * we have to compare uids even if fstatat() reports the opened - * component isn't a symlink (as we don't know whether it was - * symlink during openat() or not). - */ - - fd = ngx_openat_file(at_fd, name, mode, create, access); - - if (fd == NGX_INVALID_FILE) { - return NGX_INVALID_FILE; - } - - if (ngx_file_at_info(at_fd, name, &atfi, AT_SYMLINK_NOFOLLOW) - == NGX_FILE_ERROR) - { - err = ngx_errno; - goto failed; - } - -#if (NGX_HAVE_O_PATH) - if (ngx_file_o_path_info(fd, &fi, log) == NGX_ERROR) { - err = ngx_errno; - goto failed; - } -#else - if (ngx_fd_info(fd, &fi) == NGX_FILE_ERROR) { - err = ngx_errno; - goto failed; - } -#endif - - if (fi.st_uid != atfi.st_uid) { - err = NGX_ELOOP; - goto failed; - } - - return fd; - -failed: - - if (ngx_close_file(fd) == NGX_FILE_ERROR) { - ngx_log_error(NGX_LOG_ALERT, log, ngx_errno, - ngx_close_file_n " \"%s\" failed", name); - } - - ngx_set_errno(err); - - return NGX_INVALID_FILE; -} - - -#if (NGX_HAVE_O_PATH) - -static ngx_int_t -ngx_file_o_path_info(ngx_fd_t fd, ngx_file_info_t *fi, ngx_log_t *log) -{ - static ngx_uint_t use_fstat = 1; - - /* - * In Linux 2.6.39 the O_PATH flag was introduced that allows to obtain - * a descriptor without actually opening file or directory. It requires - * less permissions for path components, but till Linux 3.6 fstat() returns - * EBADF on such descriptors, and fstatat() with the AT_EMPTY_PATH flag - * should be used instead. - * - * Three scenarios are handled in this function: - * - * 1) The kernel is newer than 3.6 or fstat() with O_PATH support was - * backported by vendor. Then fstat() is used. - * - * 2) The kernel is newer than 2.6.39 but older than 3.6. In this case - * the first call of fstat() returns EBADF and we fallback to fstatat() - * with AT_EMPTY_PATH which was introduced at the same time as O_PATH. - * - * 3) The kernel is older than 2.6.39 but nginx was build with O_PATH - * support. Since descriptors are opened with O_PATH|O_RDONLY flags - * and O_PATH is ignored by the kernel then the O_RDONLY flag is - * actually used. In this case fstat() just works. - */ - - if (use_fstat) { - if (ngx_fd_info(fd, fi) != NGX_FILE_ERROR) { - return NGX_OK; - } - - if (ngx_errno != NGX_EBADF) { - return NGX_ERROR; - } - - ngx_log_error(NGX_LOG_NOTICE, log, 0, - "fstat(O_PATH) failed with EBADF, " - "switching to fstatat(AT_EMPTY_PATH)"); - - use_fstat = 0; - } - - if (ngx_file_at_info(fd, "", fi, AT_EMPTY_PATH) != NGX_FILE_ERROR) { - return NGX_OK; - } - - return NGX_ERROR; -} - -#endif - -#endif /* NGX_HAVE_OPENAT */ - - -static ngx_fd_t -ngx_open_file_wrapper(ngx_str_t *name, ngx_open_file_info_t *of, - ngx_int_t mode, ngx_int_t create, ngx_int_t access, ngx_log_t *log) -{ - ngx_fd_t fd; - -#if !(NGX_HAVE_OPENAT) - - fd = ngx_open_file(name->data, mode, create, access); - - if (fd == NGX_INVALID_FILE) { - of->err = ngx_errno; - of->failed = ngx_open_file_n; - return NGX_INVALID_FILE; - } - - return fd; - -#else - - u_char *p, *cp, *end; - ngx_fd_t at_fd; - ngx_str_t at_name; - - if (of->disable_symlinks == NGX_DISABLE_SYMLINKS_OFF) { - fd = ngx_open_file(name->data, mode, create, access); - - if (fd == NGX_INVALID_FILE) { - of->err = ngx_errno; - of->failed = ngx_open_file_n; - return NGX_INVALID_FILE; - } - - return fd; - } - - p = name->data; - end = p + name->len; - - at_name = *name; - - if (of->disable_symlinks_from) { - - cp = p + of->disable_symlinks_from; - - *cp = '\0'; - - at_fd = ngx_open_file(p, NGX_FILE_SEARCH|NGX_FILE_NONBLOCK, - NGX_FILE_OPEN, 0); - - *cp = '/'; - - if (at_fd == NGX_INVALID_FILE) { - of->err = ngx_errno; - of->failed = ngx_open_file_n; - return NGX_INVALID_FILE; - } - - at_name.len = of->disable_symlinks_from; - p = cp + 1; - - } else if (*p == '/') { - - at_fd = ngx_open_file("/", - NGX_FILE_SEARCH|NGX_FILE_NONBLOCK, - NGX_FILE_OPEN, 0); - - if (at_fd == NGX_INVALID_FILE) { - of->err = ngx_errno; - of->failed = ngx_openat_file_n; - return NGX_INVALID_FILE; - } - - at_name.len = 1; - p++; - - } else { - at_fd = NGX_AT_FDCWD; - } - - for ( ;; ) { - cp = ngx_strlchr(p, end, '/'); - if (cp == NULL) { - break; - } - - if (cp == p) { - p++; - continue; - } - - *cp = '\0'; - - if (of->disable_symlinks == NGX_DISABLE_SYMLINKS_NOTOWNER) { - fd = ngx_openat_file_owner(at_fd, p, - NGX_FILE_SEARCH|NGX_FILE_NONBLOCK, - NGX_FILE_OPEN, 0, log); - - } else { - fd = ngx_openat_file(at_fd, p, - NGX_FILE_SEARCH|NGX_FILE_NONBLOCK|NGX_FILE_NOFOLLOW, - NGX_FILE_OPEN, 0); - } - - *cp = '/'; - - if (fd == NGX_INVALID_FILE) { - of->err = ngx_errno; - of->failed = ngx_openat_file_n; - goto failed; - } - - if (at_fd != NGX_AT_FDCWD && ngx_close_file(at_fd) == NGX_FILE_ERROR) { - ngx_log_error(NGX_LOG_ALERT, log, ngx_errno, - ngx_close_file_n " \"%V\" failed", &at_name); - } - - p = cp + 1; - at_fd = fd; - at_name.len = cp - at_name.data; - } - - if (p == end) { - - /* - * If pathname ends with a trailing slash, assume the last path - * component is a directory and reopen it with requested flags; - * if not, fail with ENOTDIR as per POSIX. - * - * We cannot rely on O_DIRECTORY in the loop above to check - * that the last path component is a directory because - * O_DIRECTORY doesn't work on FreeBSD 8. Fortunately, by - * reopening a directory, we don't depend on it at all. - */ - - fd = ngx_openat_file(at_fd, ".", mode, create, access); - goto done; - } - - if (of->disable_symlinks == NGX_DISABLE_SYMLINKS_NOTOWNER - && !(create & (NGX_FILE_CREATE_OR_OPEN|NGX_FILE_TRUNCATE))) - { - fd = ngx_openat_file_owner(at_fd, p, mode, create, access, log); - - } else { - fd = ngx_openat_file(at_fd, p, mode|NGX_FILE_NOFOLLOW, create, access); - } - -done: - - if (fd == NGX_INVALID_FILE) { - of->err = ngx_errno; - of->failed = ngx_openat_file_n; - } - -failed: - - if (at_fd != NGX_AT_FDCWD && ngx_close_file(at_fd) == NGX_FILE_ERROR) { - ngx_log_error(NGX_LOG_ALERT, log, ngx_errno, - ngx_close_file_n " \"%V\" failed", &at_name); - } - - return fd; -#endif -} - - -static ngx_int_t -ngx_file_info_wrapper(ngx_str_t *name, ngx_open_file_info_t *of, - ngx_file_info_t *fi, ngx_log_t *log) -{ - ngx_int_t rc; - -#if !(NGX_HAVE_OPENAT) - - rc = ngx_file_info(name->data, fi); - - if (rc == NGX_FILE_ERROR) { - of->err = ngx_errno; - of->failed = ngx_file_info_n; - return NGX_FILE_ERROR; - } - - return rc; - -#else - - ngx_fd_t fd; - - if (of->disable_symlinks == NGX_DISABLE_SYMLINKS_OFF) { - - rc = ngx_file_info(name->data, fi); - - if (rc == NGX_FILE_ERROR) { - of->err = ngx_errno; - of->failed = ngx_file_info_n; - return NGX_FILE_ERROR; - } - - return rc; - } - - fd = ngx_open_file_wrapper(name, of, NGX_FILE_RDONLY|NGX_FILE_NONBLOCK, - NGX_FILE_OPEN, 0, log); - - if (fd == NGX_INVALID_FILE) { - return NGX_FILE_ERROR; - } - - rc = ngx_fd_info(fd, fi); - - if (rc == NGX_FILE_ERROR) { - of->err = ngx_errno; - of->failed = ngx_fd_info_n; - } - - if (ngx_close_file(fd) == NGX_FILE_ERROR) { - ngx_log_error(NGX_LOG_ALERT, log, ngx_errno, - ngx_close_file_n " \"%V\" failed", name); - } - - return rc; -#endif -} - - -static ngx_int_t -ngx_open_and_stat_file(ngx_str_t *name, ngx_open_file_info_t *of, - ngx_log_t *log) -{ - ngx_fd_t fd; - ngx_file_info_t fi; - - if (of->fd != NGX_INVALID_FILE) { - - if (ngx_file_info_wrapper(name, of, &fi, log) == NGX_FILE_ERROR) { - of->fd = NGX_INVALID_FILE; - return NGX_ERROR; - } - - if (of->uniq == ngx_file_uniq(&fi)) { - goto done; - } - - } else if (of->test_dir) { - - if (ngx_file_info_wrapper(name, of, &fi, log) == NGX_FILE_ERROR) { - of->fd = NGX_INVALID_FILE; - return NGX_ERROR; - } - - if (ngx_is_dir(&fi)) { - goto done; - } - } - - if (!of->log) { - - /* - * Use non-blocking open() not to hang on FIFO files, etc. - * This flag has no effect on a regular files. - */ - - fd = ngx_open_file_wrapper(name, of, NGX_FILE_RDONLY|NGX_FILE_NONBLOCK, - NGX_FILE_OPEN, 0, log); - - } else { - fd = ngx_open_file_wrapper(name, of, NGX_FILE_APPEND, - NGX_FILE_CREATE_OR_OPEN, - NGX_FILE_DEFAULT_ACCESS, log); - } - - if (fd == NGX_INVALID_FILE) { - of->fd = NGX_INVALID_FILE; - return NGX_ERROR; - } - - if (ngx_fd_info(fd, &fi) == NGX_FILE_ERROR) { - ngx_log_error(NGX_LOG_CRIT, log, ngx_errno, - ngx_fd_info_n " \"%V\" failed", name); - - if (ngx_close_file(fd) == NGX_FILE_ERROR) { - ngx_log_error(NGX_LOG_ALERT, log, ngx_errno, - ngx_close_file_n " \"%V\" failed", name); - } - - of->fd = NGX_INVALID_FILE; - - return NGX_ERROR; - } - - if (ngx_is_dir(&fi)) { - if (ngx_close_file(fd) == NGX_FILE_ERROR) { - ngx_log_error(NGX_LOG_ALERT, log, ngx_errno, - ngx_close_file_n " \"%V\" failed", name); - } - - of->fd = NGX_INVALID_FILE; - - } else { - of->fd = fd; - - if (of->read_ahead && ngx_file_size(&fi) > NGX_MIN_READ_AHEAD) { - if (ngx_read_ahead(fd, of->read_ahead) == NGX_ERROR) { - ngx_log_error(NGX_LOG_ALERT, log, ngx_errno, - ngx_read_ahead_n " \"%V\" failed", name); - } - } - - if (of->directio <= ngx_file_size(&fi)) { - if (ngx_directio_on(fd) == NGX_FILE_ERROR) { - ngx_log_error(NGX_LOG_ALERT, log, ngx_errno, - ngx_directio_on_n " \"%V\" failed", name); - - } else { - of->is_directio = 1; - } - } - } - -done: - - of->uniq = ngx_file_uniq(&fi); - of->mtime = ngx_file_mtime(&fi); - of->size = ngx_file_size(&fi); - of->fs_size = ngx_file_fs_size(&fi); - of->is_dir = ngx_is_dir(&fi); - of->is_file = ngx_is_file(&fi); - of->is_link = ngx_is_link(&fi); - of->is_exec = ngx_is_exec(&fi); - - return NGX_OK; -} - - -/* - * we ignore any possible event setting error and - * fallback to usual periodic file retests - */ - -static void -ngx_open_file_add_event(ngx_open_file_cache_t *cache, - ngx_cached_open_file_t *file, ngx_open_file_info_t *of, ngx_log_t *log) -{ - ngx_open_file_cache_event_t *fev; - - if (!(ngx_event_flags & NGX_USE_VNODE_EVENT) - || !of->events - || file->event - || of->fd == NGX_INVALID_FILE - || file->uses < of->min_uses) - { - return; - } - - file->use_event = 0; - - file->event = ngx_calloc(sizeof(ngx_event_t), log); - if (file->event== NULL) { - return; - } - - fev = ngx_alloc(sizeof(ngx_open_file_cache_event_t), log); - if (fev == NULL) { - ngx_free(file->event); - file->event = NULL; - return; - } - - fev->fd = of->fd; - fev->file = file; - fev->cache = cache; - - file->event->handler = ngx_open_file_cache_remove; - file->event->data = fev; - - /* - * although vnode event may be called while ngx_cycle->poll - * destruction, however, cleanup procedures are run before any - * memory freeing and events will be canceled. - */ - - file->event->log = ngx_cycle->log; - - if (ngx_add_event(file->event, NGX_VNODE_EVENT, NGX_ONESHOT_EVENT) - != NGX_OK) - { - ngx_free(file->event->data); - ngx_free(file->event); - file->event = NULL; - return; - } - - /* - * we do not set file->use_event here because there may be a race - * condition: a file may be deleted between opening the file and - * adding event, so we rely upon event notification only after - * one file revalidation on next file access - */ - - return; -} - - -static void -ngx_open_file_cleanup(void *data) -{ - ngx_open_file_cache_cleanup_t *c = data; - - c->file->count--; - - ngx_close_cached_file(c->cache, c->file, c->min_uses, c->log); - - /* drop one or two expired open files */ - ngx_expire_old_cached_files(c->cache, 1, c->log); -} - - -static void -ngx_close_cached_file(ngx_open_file_cache_t *cache, - ngx_cached_open_file_t *file, ngx_uint_t min_uses, ngx_log_t *log) -{ - ngx_log_debug5(NGX_LOG_DEBUG_CORE, log, 0, - "close cached open file: %s, fd:%d, c:%d, u:%d, %d", - file->name, file->fd, file->count, file->uses, file->close); - - if (!file->close) { - - file->accessed = ngx_time(); - - ngx_queue_remove(&file->queue); - - ngx_queue_insert_head(&cache->expire_queue, &file->queue); - - if (file->uses >= min_uses || file->count) { - return; - } - } - - ngx_open_file_del_event(file); - - if (file->count) { - return; - } - - if (file->fd != NGX_INVALID_FILE) { - - if (ngx_close_file(file->fd) == NGX_FILE_ERROR) { - ngx_log_error(NGX_LOG_ALERT, log, ngx_errno, - ngx_close_file_n " \"%s\" failed", file->name); - } - - file->fd = NGX_INVALID_FILE; - } - - if (!file->close) { - return; - } - - ngx_free(file->name); - ngx_free(file); -} - - -static void -ngx_open_file_del_event(ngx_cached_open_file_t *file) -{ - if (file->event == NULL) { - return; - } - - (void) ngx_del_event(file->event, NGX_VNODE_EVENT, - file->count ? NGX_FLUSH_EVENT : NGX_CLOSE_EVENT); - - ngx_free(file->event->data); - ngx_free(file->event); - file->event = NULL; - file->use_event = 0; -} - - -static void -ngx_expire_old_cached_files(ngx_open_file_cache_t *cache, ngx_uint_t n, - ngx_log_t *log) -{ - time_t now; - ngx_queue_t *q; - ngx_cached_open_file_t *file; - - now = ngx_time(); - - /* - * n == 1 deletes one or two inactive files - * n == 0 deletes least recently used file by force - * and one or two inactive files - */ - - while (n < 3) { - - if (ngx_queue_empty(&cache->expire_queue)) { - return; - } - - q = ngx_queue_last(&cache->expire_queue); - - file = ngx_queue_data(q, ngx_cached_open_file_t, queue); - - if (n++ != 0 && now - file->accessed <= cache->inactive) { - return; - } - - ngx_queue_remove(q); - - ngx_rbtree_delete(&cache->rbtree, &file->node); - - cache->current--; - - ngx_log_debug1(NGX_LOG_DEBUG_CORE, log, 0, - "expire cached open file: %s", file->name); - - if (!file->err && !file->is_dir) { - file->close = 1; - ngx_close_cached_file(cache, file, 0, log); - - } else { - ngx_free(file->name); - ngx_free(file); - } - } -} - - -static void -ngx_open_file_cache_rbtree_insert_value(ngx_rbtree_node_t *temp, - ngx_rbtree_node_t *node, ngx_rbtree_node_t *sentinel) -{ - ngx_rbtree_node_t **p; - ngx_cached_open_file_t *file, *file_temp; - - for ( ;; ) { - - if (node->key < temp->key) { - - p = &temp->left; - - } else if (node->key > temp->key) { - - p = &temp->right; - - } else { /* node->key == temp->key */ - - file = (ngx_cached_open_file_t *) node; - file_temp = (ngx_cached_open_file_t *) temp; - - p = (ngx_strcmp(file->name, file_temp->name) < 0) - ? &temp->left : &temp->right; - } - - if (*p == sentinel) { - break; - } - - temp = *p; - } - - *p = node; - node->parent = temp; - node->left = sentinel; - node->right = sentinel; - ngx_rbt_red(node); -} - - -static ngx_cached_open_file_t * -ngx_open_file_lookup(ngx_open_file_cache_t *cache, ngx_str_t *name, - uint32_t hash) -{ - ngx_int_t rc; - ngx_rbtree_node_t *node, *sentinel; - ngx_cached_open_file_t *file; - - node = cache->rbtree.root; - sentinel = cache->rbtree.sentinel; - - while (node != sentinel) { - - if (hash < node->key) { - node = node->left; - continue; - } - - if (hash > node->key) { - node = node->right; - continue; - } - - /* hash == node->key */ - - file = (ngx_cached_open_file_t *) node; - - rc = ngx_strcmp(name->data, file->name); - - if (rc == 0) { - return file; - } - - node = (rc < 0) ? node->left : node->right; - } - - return NULL; -} - - -static void -ngx_open_file_cache_remove(ngx_event_t *ev) -{ - ngx_cached_open_file_t *file; - ngx_open_file_cache_event_t *fev; - - fev = ev->data; - file = fev->file; - - ngx_queue_remove(&file->queue); - - ngx_rbtree_delete(&fev->cache->rbtree, &file->node); - - fev->cache->current--; - - /* NGX_ONESHOT_EVENT was already deleted */ - file->event = NULL; - file->use_event = 0; - - file->close = 1; - - ngx_close_cached_file(fev->cache, file, 0, ev->log); - - /* free memory only when fev->cache and fev->file are already not needed */ - - ngx_free(ev->data); - ngx_free(ev); -} |