332
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1
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2 /*
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3 * Copyright (C) Igor Sysoev
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660
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4 * Copyright (C) Nginx, Inc.
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332
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5 */
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6
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7
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8 #include <ngx_config.h>
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9 #include <ngx_core.h>
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10 #include <ngx_event.h>
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11
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12
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13 /*
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14 * open file cache caches
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15 * open file handles with stat() info;
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16 * directories stat() info;
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17 * files and directories errors: not found, access denied, etc.
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18 */
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19
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20
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532
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21 #define NGX_MIN_READ_AHEAD (128 * 1024)
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22
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23
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332
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24 static void ngx_open_file_cache_cleanup(void *data);
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662
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25 #if (NGX_HAVE_OPENAT)
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26 static ngx_fd_t ngx_openat_file_owner(ngx_fd_t at_fd, const u_char *name,
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27 ngx_int_t mode, ngx_int_t create, ngx_int_t access, ngx_log_t *log);
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28 #endif
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29 static ngx_fd_t ngx_open_file_wrapper(ngx_str_t *name,
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30 ngx_open_file_info_t *of, ngx_int_t mode, ngx_int_t create,
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31 ngx_int_t access, ngx_log_t *log);
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32 static ngx_int_t ngx_file_info_wrapper(ngx_str_t *name,
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33 ngx_open_file_info_t *of, ngx_file_info_t *fi, ngx_log_t *log);
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34 static ngx_int_t ngx_open_and_stat_file(ngx_str_t *name,
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35 ngx_open_file_info_t *of, ngx_log_t *log);
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358
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36 static void ngx_open_file_add_event(ngx_open_file_cache_t *cache,
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37 ngx_cached_open_file_t *file, ngx_open_file_info_t *of, ngx_log_t *log);
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332
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38 static void ngx_open_file_cleanup(void *data);
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39 static void ngx_close_cached_file(ngx_open_file_cache_t *cache,
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358
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40 ngx_cached_open_file_t *file, ngx_uint_t min_uses, ngx_log_t *log);
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41 static void ngx_open_file_del_event(ngx_cached_open_file_t *file);
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332
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42 static void ngx_expire_old_cached_files(ngx_open_file_cache_t *cache,
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43 ngx_uint_t n, ngx_log_t *log);
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44 static void ngx_open_file_cache_rbtree_insert_value(ngx_rbtree_node_t *temp,
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45 ngx_rbtree_node_t *node, ngx_rbtree_node_t *sentinel);
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358
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46 static ngx_cached_open_file_t *
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47 ngx_open_file_lookup(ngx_open_file_cache_t *cache, ngx_str_t *name,
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48 uint32_t hash);
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332
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49 static void ngx_open_file_cache_remove(ngx_event_t *ev);
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50
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51
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52 ngx_open_file_cache_t *
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53 ngx_open_file_cache_init(ngx_pool_t *pool, ngx_uint_t max, time_t inactive)
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54 {
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55 ngx_pool_cleanup_t *cln;
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56 ngx_open_file_cache_t *cache;
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57
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58 cache = ngx_palloc(pool, sizeof(ngx_open_file_cache_t));
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59 if (cache == NULL) {
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60 return NULL;
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61 }
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62
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358
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63 ngx_rbtree_init(&cache->rbtree, &cache->sentinel,
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64 ngx_open_file_cache_rbtree_insert_value);
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332
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65
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358
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66 ngx_queue_init(&cache->expire_queue);
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332
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67
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68 cache->current = 0;
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69 cache->max = max;
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70 cache->inactive = inactive;
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71
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72 cln = ngx_pool_cleanup_add(pool, 0);
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73 if (cln == NULL) {
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74 return NULL;
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75 }
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76
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77 cln->handler = ngx_open_file_cache_cleanup;
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78 cln->data = cache;
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79
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80 return cache;
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81 }
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82
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83
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84 static void
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85 ngx_open_file_cache_cleanup(void *data)
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86 {
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87 ngx_open_file_cache_t *cache = data;
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88
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358
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89 ngx_queue_t *q;
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332
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90 ngx_cached_open_file_t *file;
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91
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92 ngx_log_debug0(NGX_LOG_DEBUG_CORE, ngx_cycle->log, 0,
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93 "open file cache cleanup");
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94
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95 for ( ;; ) {
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96
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358
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97 if (ngx_queue_empty(&cache->expire_queue)) {
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332
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98 break;
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99 }
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100
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358
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101 q = ngx_queue_last(&cache->expire_queue);
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102
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103 file = ngx_queue_data(q, ngx_cached_open_file_t, queue);
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104
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105 ngx_queue_remove(q);
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332
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106
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107 ngx_rbtree_delete(&cache->rbtree, &file->node);
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108
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109 cache->current--;
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110
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111 ngx_log_debug1(NGX_LOG_DEBUG_CORE, ngx_cycle->log, 0,
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112 "delete cached open file: %s", file->name);
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113
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114 if (!file->err && !file->is_dir) {
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115 file->close = 1;
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116 file->count = 0;
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358
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117 ngx_close_cached_file(cache, file, 0, ngx_cycle->log);
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332
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118
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119 } else {
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120 ngx_free(file->name);
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121 ngx_free(file);
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122 }
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123 }
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124
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125 if (cache->current) {
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126 ngx_log_error(NGX_LOG_ALERT, ngx_cycle->log, 0,
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127 "%d items still leave in open file cache",
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128 cache->current);
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129 }
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130
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131 if (cache->rbtree.root != cache->rbtree.sentinel) {
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132 ngx_log_error(NGX_LOG_ALERT, ngx_cycle->log, 0,
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133 "rbtree still is not empty in open file cache");
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134
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135 }
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136 }
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137
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138
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139 ngx_int_t
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140 ngx_open_cached_file(ngx_open_file_cache_t *cache, ngx_str_t *name,
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141 ngx_open_file_info_t *of, ngx_pool_t *pool)
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142 {
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143 time_t now;
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144 uint32_t hash;
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145 ngx_int_t rc;
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482
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146 ngx_file_info_t fi;
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332
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147 ngx_pool_cleanup_t *cln;
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148 ngx_cached_open_file_t *file;
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149 ngx_pool_cleanup_file_t *clnf;
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150 ngx_open_file_cache_cleanup_t *ofcln;
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151
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384
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152 of->fd = NGX_INVALID_FILE;
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332
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153 of->err = 0;
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154
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155 if (cache == NULL) {
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156
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482
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157 if (of->test_only) {
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158
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662
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159 if (ngx_file_info_wrapper(name, of, &fi, pool->log)
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160 == NGX_FILE_ERROR)
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161 {
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482
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162 return NGX_ERROR;
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163 }
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164
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165 of->uniq = ngx_file_uniq(&fi);
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166 of->mtime = ngx_file_mtime(&fi);
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167 of->size = ngx_file_size(&fi);
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622
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168 of->fs_size = ngx_file_fs_size(&fi);
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482
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169 of->is_dir = ngx_is_dir(&fi);
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170 of->is_file = ngx_is_file(&fi);
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171 of->is_link = ngx_is_link(&fi);
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172 of->is_exec = ngx_is_exec(&fi);
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173
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174 return NGX_OK;
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175 }
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176
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332
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177 cln = ngx_pool_cleanup_add(pool, sizeof(ngx_pool_cleanup_file_t));
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178 if (cln == NULL) {
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179 return NGX_ERROR;
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180 }
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181
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662
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182 rc = ngx_open_and_stat_file(name, of, pool->log);
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332
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183
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184 if (rc == NGX_OK && !of->is_dir) {
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185 cln->handler = ngx_pool_cleanup_file;
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186 clnf = cln->data;
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187
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188 clnf->fd = of->fd;
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189 clnf->name = name->data;
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190 clnf->log = pool->log;
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191 }
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192
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193 return rc;
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194 }
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195
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196 cln = ngx_pool_cleanup_add(pool, sizeof(ngx_open_file_cache_cleanup_t));
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197 if (cln == NULL) {
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198 return NGX_ERROR;
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199 }
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200
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201 now = ngx_time();
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202
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358
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203 hash = ngx_crc32_long(name->data, name->len);
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204
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205 file = ngx_open_file_lookup(cache, name, hash);
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206
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207 if (file) {
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208
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209 file->uses++;
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210
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211 ngx_queue_remove(&file->queue);
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332
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212
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358
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213 if (file->fd == NGX_INVALID_FILE && file->err == 0 && !file->is_dir) {
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214
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215 /* file was not used often enough to keep open */
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216
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662
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217 rc = ngx_open_and_stat_file(name, of, pool->log);
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332
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218
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358
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219 if (rc != NGX_OK && (of->err == 0 || !of->errors)) {
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220 goto failed;
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221 }
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222
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223 goto add_event;
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332
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224 }
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225
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384
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226 if (file->use_event
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227 || (file->event == NULL
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228 && (of->uniq == 0 || of->uniq == file->uniq)
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662
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229 && now - file->created < of->valid
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230 #if (NGX_HAVE_OPENAT)
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231 && of->disable_symlinks == file->disable_symlinks
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232 #endif
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233 ))
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358
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234 {
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235 if (file->err == 0) {
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332
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236
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358
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237 of->fd = file->fd;
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238 of->uniq = file->uniq;
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239 of->mtime = file->mtime;
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240 of->size = file->size;
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332
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241
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358
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242 of->is_dir = file->is_dir;
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243 of->is_file = file->is_file;
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244 of->is_link = file->is_link;
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245 of->is_exec = file->is_exec;
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410
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246 of->is_directio = file->is_directio;
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332
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247
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358
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248 if (!file->is_dir) {
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249 file->count++;
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250 ngx_open_file_add_event(cache, file, of, pool->log);
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332
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251 }
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252
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358
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253 } else {
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254 of->err = file->err;
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662
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255 #if (NGX_HAVE_OPENAT)
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256 of->failed = file->disable_symlinks ? ngx_openat_file_n
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257 : ngx_open_file_n;
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258 #else
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484
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259 of->failed = ngx_open_file_n;
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662
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260 #endif
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358
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261 }
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262
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263 goto found;
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264 }
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265
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266 ngx_log_debug4(NGX_LOG_DEBUG_CORE, pool->log, 0,
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267 "retest open file: %s, fd:%d, c:%d, e:%d",
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268 file->name, file->fd, file->count, file->err);
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269
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270 if (file->is_dir) {
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271
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272 /*
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273 * chances that directory became file are very small
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274 * so test_dir flag allows to use a single syscall
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275 * in ngx_file_info() instead of three syscalls
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276 */
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277
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278 of->test_dir = 1;
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279 }
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280
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384
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281 of->fd = file->fd;
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282 of->uniq = file->uniq;
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283
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662
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284 rc = ngx_open_and_stat_file(name, of, pool->log);
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332
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285
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358
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286 if (rc != NGX_OK && (of->err == 0 || !of->errors)) {
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287 goto failed;
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288 }
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289
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290 if (of->is_dir) {
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291
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292 if (file->is_dir || file->err) {
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293 goto update;
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294 }
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295
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296 /* file became directory */
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297
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298 } else if (of->err == 0) { /* file */
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299
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300 if (file->is_dir || file->err) {
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301 goto add_event;
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302 }
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303
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384
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304 if (of->uniq == file->uniq) {
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332
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305
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358
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306 if (file->event) {
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307 file->use_event = 1;
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332
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308 }
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309
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638
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310 of->is_directio = file->is_directio;
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311
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312 goto update;
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358
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313 }
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332
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314
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358
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315 /* file was changed */
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332
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316
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358
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317 } else { /* error to cache */
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332
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318
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358
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319 if (file->err || file->is_dir) {
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320 goto update;
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332
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321 }
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322
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358
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323 /* file was removed, etc. */
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324 }
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325
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326 if (file->count == 0) {
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327
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328 ngx_open_file_del_event(file);
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332
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329
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358
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330 if (ngx_close_file(file->fd) == NGX_FILE_ERROR) {
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331 ngx_log_error(NGX_LOG_ALERT, pool->log, ngx_errno,
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662
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332 ngx_close_file_n " \"%V\" failed", name);
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358
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333 }
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332
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334
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358
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335 goto add_event;
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336 }
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337
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338 ngx_rbtree_delete(&cache->rbtree, &file->node);
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339
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340 cache->current--;
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341
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342 file->close = 1;
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343
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344 goto create;
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332
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345 }
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346
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347 /* not found */
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348
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662
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349 rc = ngx_open_and_stat_file(name, of, pool->log);
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332
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350
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351 if (rc != NGX_OK && (of->err == 0 || !of->errors)) {
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352 goto failed;
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353 }
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354
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355 create:
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356
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357 if (cache->current >= cache->max) {
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358 ngx_expire_old_cached_files(cache, 0, pool->log);
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359 }
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360
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361 file = ngx_alloc(sizeof(ngx_cached_open_file_t), pool->log);
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362
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363 if (file == NULL) {
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364 goto failed;
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365 }
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366
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367 file->name = ngx_alloc(name->len + 1, pool->log);
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368
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369 if (file->name == NULL) {
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370 ngx_free(file);
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371 file = NULL;
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372 goto failed;
|
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373 }
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374
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375 ngx_cpystrn(file->name, name->data, name->len + 1);
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376
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377 file->node.key = hash;
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378
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379 ngx_rbtree_insert(&cache->rbtree, &file->node);
|
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380
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381 cache->current++;
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382
|
358
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383 file->uses = 1;
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332
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384 file->count = 0;
|
500
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385 file->use_event = 0;
|
358
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386 file->event = NULL;
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387
|
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388 add_event:
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389
|
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390 ngx_open_file_add_event(cache, file, of, pool->log);
|
332
|
391
|
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392 update:
|
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393
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394 file->fd = of->fd;
|
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395 file->err = of->err;
|
662
|
396 #if (NGX_HAVE_OPENAT)
|
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397 file->disable_symlinks = of->disable_symlinks;
|
|
398 #endif
|
332
|
399
|
|
400 if (of->err == 0) {
|
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401 file->uniq = of->uniq;
|
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402 file->mtime = of->mtime;
|
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403 file->size = of->size;
|
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404
|
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405 file->close = 0;
|
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406
|
|
407 file->is_dir = of->is_dir;
|
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408 file->is_file = of->is_file;
|
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409 file->is_link = of->is_link;
|
|
410 file->is_exec = of->is_exec;
|
410
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411 file->is_directio = of->is_directio;
|
332
|
412
|
|
413 if (!of->is_dir) {
|
|
414 file->count++;
|
|
415 }
|
|
416 }
|
|
417
|
|
418 file->created = now;
|
|
419
|
|
420 found:
|
|
421
|
|
422 file->accessed = now;
|
|
423
|
358
|
424 ngx_queue_insert_head(&cache->expire_queue, &file->queue);
|
332
|
425
|
358
|
426 ngx_log_debug5(NGX_LOG_DEBUG_CORE, pool->log, 0,
|
|
427 "cached open file: %s, fd:%d, c:%d, e:%d, u:%d",
|
|
428 file->name, file->fd, file->count, file->err, file->uses);
|
332
|
429
|
|
430 if (of->err == 0) {
|
|
431
|
|
432 if (!of->is_dir) {
|
|
433 cln->handler = ngx_open_file_cleanup;
|
|
434 ofcln = cln->data;
|
|
435
|
|
436 ofcln->cache = cache;
|
|
437 ofcln->file = file;
|
358
|
438 ofcln->min_uses = of->min_uses;
|
332
|
439 ofcln->log = pool->log;
|
|
440 }
|
|
441
|
|
442 return NGX_OK;
|
|
443 }
|
|
444
|
|
445 return NGX_ERROR;
|
|
446
|
|
447 failed:
|
|
448
|
374
|
449 if (file) {
|
332
|
450 ngx_rbtree_delete(&cache->rbtree, &file->node);
|
|
451
|
|
452 cache->current--;
|
|
453
|
374
|
454 if (file->count == 0) {
|
|
455
|
376
|
456 if (file->fd != NGX_INVALID_FILE) {
|
|
457 if (ngx_close_file(file->fd) == NGX_FILE_ERROR) {
|
|
458 ngx_log_error(NGX_LOG_ALERT, pool->log, ngx_errno,
|
|
459 ngx_close_file_n " \"%s\" failed",
|
374
|
460 file->name);
|
376
|
461 }
|
|
462 }
|
374
|
463
|
|
464 ngx_free(file->name);
|
|
465 ngx_free(file);
|
|
466
|
|
467 } else {
|
|
468 file->close = 1;
|
332
|
469 }
|
|
470 }
|
|
471
|
|
472 if (of->fd != NGX_INVALID_FILE) {
|
|
473 if (ngx_close_file(of->fd) == NGX_FILE_ERROR) {
|
|
474 ngx_log_error(NGX_LOG_ALERT, pool->log, ngx_errno,
|
662
|
475 ngx_close_file_n " \"%V\" failed", name);
|
332
|
476 }
|
|
477 }
|
|
478
|
|
479 return NGX_ERROR;
|
|
480 }
|
|
481
|
|
482
|
662
|
483 #if (NGX_HAVE_OPENAT)
|
|
484
|
|
485 static ngx_fd_t
|
|
486 ngx_openat_file_owner(ngx_fd_t at_fd, const u_char *name,
|
|
487 ngx_int_t mode, ngx_int_t create, ngx_int_t access, ngx_log_t *log)
|
|
488 {
|
|
489 ngx_fd_t fd;
|
|
490 ngx_err_t err;
|
|
491 ngx_file_info_t fi, atfi;
|
|
492
|
|
493 /*
|
|
494 * To allow symlinks with the same owner, use openat() (followed
|
|
495 * by fstat()) and fstatat(AT_SYMLINK_NOFOLLOW), and then compare
|
|
496 * uids between fstat() and fstatat().
|
|
497 *
|
|
498 * As there is a race between openat() and fstatat() we don't
|
|
499 * know if openat() in fact opened symlink or not. Therefore,
|
|
500 * we have to compare uids even if fstatat() reports the opened
|
|
501 * component isn't a symlink (as we don't know whether it was
|
|
502 * symlink during openat() or not).
|
|
503 */
|
|
504
|
|
505 fd = ngx_openat_file(at_fd, name, mode, create, access);
|
|
506
|
|
507 if (fd == NGX_FILE_ERROR) {
|
|
508 return NGX_FILE_ERROR;
|
|
509 }
|
|
510
|
|
511 if (ngx_file_at_info(at_fd, name, &atfi, AT_SYMLINK_NOFOLLOW)
|
|
512 == NGX_FILE_ERROR)
|
|
513 {
|
|
514 err = ngx_errno;
|
|
515 goto failed;
|
|
516 }
|
|
517
|
|
518 if (ngx_fd_info(fd, &fi) == NGX_FILE_ERROR) {
|
|
519 err = ngx_errno;
|
|
520 goto failed;
|
|
521 }
|
|
522
|
|
523 if (fi.st_uid != atfi.st_uid) {
|
|
524 err = NGX_ELOOP;
|
|
525 goto failed;
|
|
526 }
|
|
527
|
|
528 return fd;
|
|
529
|
|
530 failed:
|
|
531
|
|
532 if (ngx_close_file(fd) == NGX_FILE_ERROR) {
|
|
533 ngx_log_error(NGX_LOG_ALERT, log, ngx_errno,
|
|
534 ngx_close_file_n " \"%V\" failed", name);
|
|
535 }
|
|
536
|
|
537 ngx_set_errno(err);
|
|
538
|
|
539 return NGX_INVALID_FILE;
|
|
540 }
|
|
541
|
|
542 #endif
|
|
543
|
|
544
|
|
545 static ngx_fd_t
|
|
546 ngx_open_file_wrapper(ngx_str_t *name, ngx_open_file_info_t *of,
|
|
547 ngx_int_t mode, ngx_int_t create, ngx_int_t access, ngx_log_t *log)
|
|
548 {
|
|
549 ngx_fd_t fd;
|
|
550
|
|
551 #if !(NGX_HAVE_OPENAT)
|
|
552
|
|
553 fd = ngx_open_file(name->data, mode, create, access);
|
|
554
|
|
555 if (fd == NGX_INVALID_FILE) {
|
|
556 of->err = ngx_errno;
|
|
557 of->failed = ngx_open_file_n;
|
|
558 return NGX_INVALID_FILE;
|
|
559 }
|
|
560
|
|
561 return fd;
|
|
562
|
|
563 #else
|
|
564
|
|
565 u_char *p, *cp, *end;
|
|
566 ngx_fd_t at_fd;
|
|
567 ngx_str_t at_name;
|
|
568 ngx_file_info_t fi;
|
|
569
|
|
570 if (of->disable_symlinks == NGX_DISABLE_SYMLINKS_OFF) {
|
|
571 fd = ngx_open_file(name->data, mode, create, access);
|
|
572
|
|
573 if (fd == NGX_INVALID_FILE) {
|
|
574 of->err = ngx_errno;
|
|
575 of->failed = ngx_open_file_n;
|
|
576 return NGX_INVALID_FILE;
|
|
577 }
|
|
578
|
|
579 return fd;
|
|
580 }
|
|
581
|
|
582 p = name->data;
|
|
583 end = p + name->len;
|
|
584
|
|
585 at_fd = AT_FDCWD;
|
|
586 at_name = *name;
|
|
587
|
|
588 if (p[0] == '/') {
|
|
589 at_fd = ngx_openat_file(at_fd, "/",
|
|
590 NGX_FILE_RDONLY|NGX_FILE_NONBLOCK,
|
|
591 NGX_FILE_OPEN, 0);
|
|
592
|
|
593 if (at_fd == NGX_FILE_ERROR) {
|
|
594 of->err = ngx_errno;
|
|
595 of->failed = ngx_openat_file_n;
|
|
596 return NGX_FILE_ERROR;
|
|
597 }
|
|
598
|
|
599 at_name.len = 1;
|
|
600 p++;
|
|
601 }
|
|
602
|
|
603 for ( ;; ) {
|
|
604 cp = ngx_strlchr(p, end, '/');
|
|
605 if (cp == NULL) {
|
|
606 break;
|
|
607 }
|
|
608
|
|
609 if (cp == p) {
|
|
610 p++;
|
|
611 continue;
|
|
612 }
|
|
613
|
|
614 *cp = '\0';
|
|
615
|
|
616 if (of->disable_symlinks == NGX_DISABLE_SYMLINKS_NOTOWNER) {
|
|
617 fd = ngx_openat_file_owner(at_fd, p,
|
|
618 NGX_FILE_RDONLY|NGX_FILE_NONBLOCK,
|
|
619 NGX_FILE_OPEN, 0, log);
|
|
620
|
|
621 } else {
|
|
622 fd = ngx_openat_file(at_fd, p,
|
|
623 NGX_FILE_RDONLY|NGX_FILE_NONBLOCK|NGX_FILE_NOFOLLOW,
|
|
624 NGX_FILE_OPEN, 0);
|
|
625 }
|
|
626
|
|
627 *cp = '/';
|
|
628
|
|
629 if (fd == NGX_INVALID_FILE) {
|
|
630 of->err = ngx_errno;
|
|
631 of->failed = ngx_openat_file_n;
|
|
632 goto failed;
|
|
633 }
|
|
634
|
|
635 if (at_fd != AT_FDCWD && ngx_close_file(at_fd) == NGX_FILE_ERROR) {
|
|
636 ngx_log_error(NGX_LOG_ALERT, log, ngx_errno,
|
|
637 ngx_close_file_n " \"%V\" failed", at_name);
|
|
638 }
|
|
639
|
|
640 p = cp + 1;
|
|
641 at_fd = fd;
|
|
642 at_name.len = cp - at_name.data;
|
|
643 }
|
|
644
|
|
645 if (p == end && at_fd != AT_FDCWD) {
|
|
646
|
|
647 /*
|
|
648 * If pathname ends with a trailing slash, check if last path
|
|
649 * component is a directory; if not, fail with ENOTDIR as per
|
|
650 * POSIX.
|
|
651 *
|
|
652 * We use separate check instead of O_DIRECTORY in the loop above,
|
|
653 * as O_DIRECTORY doesn't work on FreeBSD 8.
|
|
654 *
|
|
655 * Note this returns already opened file descriptor, with different
|
|
656 * mode/create/access. This is believed to be safe as we don't
|
|
657 * use this codepath to create directories.
|
|
658 */
|
|
659
|
|
660 if (ngx_fd_info(at_fd, &fi) == NGX_FILE_ERROR) {
|
|
661 of->err = ngx_errno;
|
|
662 of->failed = ngx_fd_info_n;
|
|
663 fd = NGX_INVALID_FILE;
|
|
664
|
|
665 goto failed;
|
|
666 }
|
|
667
|
|
668 if (ngx_is_dir(&fi)) {
|
|
669 return at_fd;
|
|
670 }
|
|
671
|
|
672 of->err = ENOTDIR;
|
|
673 of->failed = ngx_openat_file_n;
|
|
674 fd = NGX_INVALID_FILE;
|
|
675
|
|
676 goto failed;
|
|
677 }
|
|
678
|
|
679 if (of->disable_symlinks == NGX_DISABLE_SYMLINKS_NOTOWNER) {
|
|
680 fd = ngx_openat_file_owner(at_fd, p, mode, create, access, log);
|
|
681
|
|
682 } else {
|
|
683 fd = ngx_openat_file(at_fd, p, mode|NGX_FILE_NOFOLLOW, create, access);
|
|
684 }
|
|
685
|
|
686 if (fd == NGX_INVALID_FILE) {
|
|
687 of->err = ngx_errno;
|
|
688 of->failed = ngx_openat_file_n;
|
|
689 }
|
|
690
|
|
691 failed:
|
|
692
|
|
693 if (at_fd != AT_FDCWD && ngx_close_file(at_fd) == NGX_FILE_ERROR) {
|
|
694 ngx_log_error(NGX_LOG_ALERT, log, ngx_errno,
|
|
695 ngx_close_file_n " \"%V\" failed", at_name);
|
|
696 }
|
|
697
|
|
698 return fd;
|
|
699 #endif
|
|
700 }
|
|
701
|
|
702
|
332
|
703 static ngx_int_t
|
662
|
704 ngx_file_info_wrapper(ngx_str_t *name, ngx_open_file_info_t *of,
|
|
705 ngx_file_info_t *fi, ngx_log_t *log)
|
|
706 {
|
|
707 ngx_int_t rc;
|
|
708
|
|
709 #if !(NGX_HAVE_OPENAT)
|
|
710
|
|
711 rc = ngx_file_info(name->data, fi);
|
|
712
|
|
713 if (rc == NGX_FILE_ERROR) {
|
|
714 of->err = ngx_errno;
|
|
715 of->failed = ngx_file_info_n;
|
|
716 return NGX_FILE_ERROR;
|
|
717 }
|
|
718
|
|
719 return rc;
|
|
720
|
|
721 #else
|
|
722
|
|
723 ngx_fd_t fd;
|
|
724
|
|
725 if (of->disable_symlinks == NGX_DISABLE_SYMLINKS_OFF) {
|
|
726
|
|
727 rc = ngx_file_info(name->data, fi);
|
|
728
|
|
729 if (rc == NGX_FILE_ERROR) {
|
|
730 of->err = ngx_errno;
|
|
731 of->failed = ngx_file_info_n;
|
|
732 return NGX_FILE_ERROR;
|
|
733 }
|
|
734
|
|
735 return rc;
|
|
736 }
|
|
737
|
|
738 fd = ngx_open_file_wrapper(name, of, NGX_FILE_RDONLY|NGX_FILE_NONBLOCK,
|
|
739 NGX_FILE_OPEN, 0, log);
|
|
740
|
|
741 if (fd == NGX_INVALID_FILE) {
|
|
742 return NGX_FILE_ERROR;
|
|
743 }
|
|
744
|
|
745 rc = ngx_fd_info(fd, fi);
|
|
746
|
|
747 if (rc == NGX_FILE_ERROR) {
|
|
748 of->err = ngx_errno;
|
|
749 of->failed = ngx_fd_info_n;
|
|
750 }
|
|
751
|
|
752 if (ngx_close_file(fd) == NGX_FILE_ERROR) {
|
|
753 ngx_log_error(NGX_LOG_ALERT, log, ngx_errno,
|
|
754 ngx_close_file_n " \"%V\" failed", name);
|
|
755 }
|
|
756
|
|
757 return rc;
|
|
758 #endif
|
|
759 }
|
|
760
|
|
761
|
|
762 static ngx_int_t
|
|
763 ngx_open_and_stat_file(ngx_str_t *name, ngx_open_file_info_t *of,
|
|
764 ngx_log_t *log)
|
332
|
765 {
|
|
766 ngx_fd_t fd;
|
|
767 ngx_file_info_t fi;
|
|
768
|
384
|
769 if (of->fd != NGX_INVALID_FILE) {
|
332
|
770
|
662
|
771 if (ngx_file_info_wrapper(name, of, &fi, log) == NGX_FILE_ERROR) {
|
|
772 of->fd = NGX_INVALID_FILE;
|
|
773 return NGX_ERROR;
|
332
|
774 }
|
|
775
|
384
|
776 if (of->uniq == ngx_file_uniq(&fi)) {
|
|
777 goto done;
|
|
778 }
|
|
779
|
|
780 } else if (of->test_dir) {
|
|
781
|
662
|
782 if (ngx_file_info_wrapper(name, of, &fi, log) == NGX_FILE_ERROR) {
|
|
783 of->fd = NGX_INVALID_FILE;
|
|
784 return NGX_ERROR;
|
384
|
785 }
|
332
|
786
|
440
|
787 if (ngx_is_dir(&fi)) {
|
384
|
788 goto done;
|
332
|
789 }
|
|
790 }
|
|
791
|
384
|
792 if (!of->log) {
|
568
|
793
|
|
794 /*
|
|
795 * Use non-blocking open() not to hang on FIFO files, etc.
|
|
796 * This flag has no effect on a regular files.
|
|
797 */
|
|
798
|
662
|
799 fd = ngx_open_file_wrapper(name, of, NGX_FILE_RDONLY|NGX_FILE_NONBLOCK,
|
|
800 NGX_FILE_OPEN, 0, log);
|
384
|
801
|
|
802 } else {
|
662
|
803 fd = ngx_open_file_wrapper(name, of, NGX_FILE_APPEND,
|
|
804 NGX_FILE_CREATE_OR_OPEN,
|
|
805 NGX_FILE_DEFAULT_ACCESS, log);
|
384
|
806 }
|
332
|
807
|
|
808 if (fd == NGX_INVALID_FILE) {
|
662
|
809 of->fd = NGX_INVALID_FILE;
|
|
810 return NGX_ERROR;
|
332
|
811 }
|
|
812
|
|
813 if (ngx_fd_info(fd, &fi) == NGX_FILE_ERROR) {
|
|
814 ngx_log_error(NGX_LOG_CRIT, log, ngx_errno,
|
662
|
815 ngx_fd_info_n " \"%V\" failed", name);
|
332
|
816
|
|
817 if (ngx_close_file(fd) == NGX_FILE_ERROR) {
|
|
818 ngx_log_error(NGX_LOG_ALERT, log, ngx_errno,
|
662
|
819 ngx_close_file_n " \"%V\" failed", name);
|
332
|
820 }
|
|
821
|
384
|
822 of->fd = NGX_INVALID_FILE;
|
|
823
|
332
|
824 return NGX_ERROR;
|
|
825 }
|
|
826
|
|
827 if (ngx_is_dir(&fi)) {
|
|
828 if (ngx_close_file(fd) == NGX_FILE_ERROR) {
|
|
829 ngx_log_error(NGX_LOG_ALERT, log, ngx_errno,
|
662
|
830 ngx_close_file_n " \"%V\" failed", name);
|
332
|
831 }
|
|
832
|
384
|
833 of->fd = NGX_INVALID_FILE;
|
|
834
|
|
835 } else {
|
|
836 of->fd = fd;
|
390
|
837
|
532
|
838 if (of->read_ahead && ngx_file_size(&fi) > NGX_MIN_READ_AHEAD) {
|
|
839 if (ngx_read_ahead(fd, of->read_ahead) == NGX_ERROR) {
|
|
840 ngx_log_error(NGX_LOG_ALERT, log, ngx_errno,
|
662
|
841 ngx_read_ahead_n " \"%V\" failed", name);
|
532
|
842 }
|
|
843 }
|
|
844
|
390
|
845 if (of->directio <= ngx_file_size(&fi)) {
|
530
|
846 if (ngx_directio_on(fd) == NGX_FILE_ERROR) {
|
390
|
847 ngx_log_error(NGX_LOG_ALERT, log, ngx_errno,
|
662
|
848 ngx_directio_on_n " \"%V\" failed", name);
|
406
|
849
|
|
850 } else {
|
|
851 of->is_directio = 1;
|
390
|
852 }
|
|
853 }
|
332
|
854 }
|
|
855
|
384
|
856 done:
|
|
857
|
332
|
858 of->uniq = ngx_file_uniq(&fi);
|
|
859 of->mtime = ngx_file_mtime(&fi);
|
|
860 of->size = ngx_file_size(&fi);
|
622
|
861 of->fs_size = ngx_file_fs_size(&fi);
|
332
|
862 of->is_dir = ngx_is_dir(&fi);
|
|
863 of->is_file = ngx_is_file(&fi);
|
|
864 of->is_link = ngx_is_link(&fi);
|
|
865 of->is_exec = ngx_is_exec(&fi);
|
|
866
|
|
867 return NGX_OK;
|
|
868 }
|
|
869
|
|
870
|
358
|
871 /*
|
|
872 * we ignore any possible event setting error and
|
|
873 * fallback to usual periodic file retests
|
|
874 */
|
|
875
|
|
876 static void
|
|
877 ngx_open_file_add_event(ngx_open_file_cache_t *cache,
|
|
878 ngx_cached_open_file_t *file, ngx_open_file_info_t *of, ngx_log_t *log)
|
|
879 {
|
|
880 ngx_open_file_cache_event_t *fev;
|
|
881
|
|
882 if (!(ngx_event_flags & NGX_USE_VNODE_EVENT)
|
|
883 || !of->events
|
|
884 || file->event
|
|
885 || of->fd == NGX_INVALID_FILE
|
|
886 || file->uses < of->min_uses)
|
|
887 {
|
|
888 return;
|
|
889 }
|
|
890
|
384
|
891 file->use_event = 0;
|
|
892
|
358
|
893 file->event = ngx_calloc(sizeof(ngx_event_t), log);
|
|
894 if (file->event== NULL) {
|
|
895 return;
|
|
896 }
|
|
897
|
|
898 fev = ngx_alloc(sizeof(ngx_open_file_cache_event_t), log);
|
|
899 if (fev == NULL) {
|
|
900 ngx_free(file->event);
|
|
901 file->event = NULL;
|
|
902 return;
|
|
903 }
|
|
904
|
|
905 fev->fd = of->fd;
|
|
906 fev->file = file;
|
|
907 fev->cache = cache;
|
|
908
|
|
909 file->event->handler = ngx_open_file_cache_remove;
|
|
910 file->event->data = fev;
|
|
911
|
|
912 /*
|
|
913 * although vnode event may be called while ngx_cycle->poll
|
|
914 * destruction, however, cleanup procedures are run before any
|
|
915 * memory freeing and events will be canceled.
|
|
916 */
|
|
917
|
|
918 file->event->log = ngx_cycle->log;
|
|
919
|
|
920 if (ngx_add_event(file->event, NGX_VNODE_EVENT, NGX_ONESHOT_EVENT)
|
|
921 != NGX_OK)
|
|
922 {
|
|
923 ngx_free(file->event->data);
|
|
924 ngx_free(file->event);
|
|
925 file->event = NULL;
|
|
926 return;
|
|
927 }
|
|
928
|
|
929 /*
|
384
|
930 * we do not set file->use_event here because there may be a race
|
|
931 * condition: a file may be deleted between opening the file and
|
|
932 * adding event, so we rely upon event notification only after
|
|
933 * one file revalidation on next file access
|
358
|
934 */
|
|
935
|
|
936 return;
|
|
937 }
|
|
938
|
|
939
|
332
|
940 static void
|
|
941 ngx_open_file_cleanup(void *data)
|
|
942 {
|
|
943 ngx_open_file_cache_cleanup_t *c = data;
|
|
944
|
|
945 c->file->count--;
|
|
946
|
358
|
947 ngx_close_cached_file(c->cache, c->file, c->min_uses, c->log);
|
332
|
948
|
|
949 /* drop one or two expired open files */
|
|
950 ngx_expire_old_cached_files(c->cache, 1, c->log);
|
|
951 }
|
|
952
|
|
953
|
|
954 static void
|
|
955 ngx_close_cached_file(ngx_open_file_cache_t *cache,
|
358
|
956 ngx_cached_open_file_t *file, ngx_uint_t min_uses, ngx_log_t *log)
|
332
|
957 {
|
358
|
958 ngx_log_debug5(NGX_LOG_DEBUG_CORE, log, 0,
|
|
959 "close cached open file: %s, fd:%d, c:%d, u:%d, %d",
|
|
960 file->name, file->fd, file->count, file->uses, file->close);
|
332
|
961
|
|
962 if (!file->close) {
|
|
963
|
|
964 file->accessed = ngx_time();
|
|
965
|
358
|
966 ngx_queue_remove(&file->queue);
|
332
|
967
|
358
|
968 ngx_queue_insert_head(&cache->expire_queue, &file->queue);
|
332
|
969
|
358
|
970 if (file->uses >= min_uses || file->count) {
|
|
971 return;
|
332
|
972 }
|
|
973 }
|
|
974
|
358
|
975 ngx_open_file_del_event(file);
|
332
|
976
|
|
977 if (file->count) {
|
|
978 return;
|
|
979 }
|
|
980
|
358
|
981 if (file->fd != NGX_INVALID_FILE) {
|
|
982
|
|
983 if (ngx_close_file(file->fd) == NGX_FILE_ERROR) {
|
|
984 ngx_log_error(NGX_LOG_ALERT, log, ngx_errno,
|
|
985 ngx_close_file_n " \"%s\" failed", file->name);
|
|
986 }
|
|
987
|
|
988 file->fd = NGX_INVALID_FILE;
|
|
989 }
|
|
990
|
|
991 if (!file->close) {
|
|
992 return;
|
332
|
993 }
|
|
994
|
|
995 ngx_free(file->name);
|
|
996 ngx_free(file);
|
|
997 }
|
|
998
|
|
999
|
|
1000 static void
|
358
|
1001 ngx_open_file_del_event(ngx_cached_open_file_t *file)
|
|
1002 {
|
|
1003 if (file->event == NULL) {
|
|
1004 return;
|
|
1005 }
|
|
1006
|
|
1007 (void) ngx_del_event(file->event, NGX_VNODE_EVENT,
|
|
1008 file->count ? NGX_FLUSH_EVENT : NGX_CLOSE_EVENT);
|
|
1009
|
|
1010 ngx_free(file->event->data);
|
|
1011 ngx_free(file->event);
|
|
1012 file->event = NULL;
|
|
1013 file->use_event = 0;
|
|
1014 }
|
|
1015
|
|
1016
|
|
1017 static void
|
332
|
1018 ngx_expire_old_cached_files(ngx_open_file_cache_t *cache, ngx_uint_t n,
|
|
1019 ngx_log_t *log)
|
|
1020 {
|
|
1021 time_t now;
|
358
|
1022 ngx_queue_t *q;
|
332
|
1023 ngx_cached_open_file_t *file;
|
|
1024
|
|
1025 now = ngx_time();
|
|
1026
|
|
1027 /*
|
|
1028 * n == 1 deletes one or two inactive files
|
|
1029 * n == 0 deletes least recently used file by force
|
|
1030 * and one or two inactive files
|
|
1031 */
|
|
1032
|
|
1033 while (n < 3) {
|
|
1034
|
358
|
1035 if (ngx_queue_empty(&cache->expire_queue)) {
|
332
|
1036 return;
|
|
1037 }
|
|
1038
|
358
|
1039 q = ngx_queue_last(&cache->expire_queue);
|
|
1040
|
|
1041 file = ngx_queue_data(q, ngx_cached_open_file_t, queue);
|
|
1042
|
332
|
1043 if (n++ != 0 && now - file->accessed <= cache->inactive) {
|
|
1044 return;
|
|
1045 }
|
|
1046
|
358
|
1047 ngx_queue_remove(q);
|
332
|
1048
|
|
1049 ngx_rbtree_delete(&cache->rbtree, &file->node);
|
|
1050
|
|
1051 cache->current--;
|
|
1052
|
|
1053 ngx_log_debug1(NGX_LOG_DEBUG_CORE, log, 0,
|
|
1054 "expire cached open file: %s", file->name);
|
|
1055
|
|
1056 if (!file->err && !file->is_dir) {
|
|
1057 file->close = 1;
|
358
|
1058 ngx_close_cached_file(cache, file, 0, log);
|
332
|
1059
|
|
1060 } else {
|
|
1061 ngx_free(file->name);
|
|
1062 ngx_free(file);
|
|
1063 }
|
|
1064 }
|
|
1065 }
|
|
1066
|
|
1067
|
|
1068 static void
|
|
1069 ngx_open_file_cache_rbtree_insert_value(ngx_rbtree_node_t *temp,
|
|
1070 ngx_rbtree_node_t *node, ngx_rbtree_node_t *sentinel)
|
|
1071 {
|
|
1072 ngx_rbtree_node_t **p;
|
|
1073 ngx_cached_open_file_t *file, *file_temp;
|
|
1074
|
|
1075 for ( ;; ) {
|
|
1076
|
|
1077 if (node->key < temp->key) {
|
|
1078
|
|
1079 p = &temp->left;
|
|
1080
|
|
1081 } else if (node->key > temp->key) {
|
|
1082
|
|
1083 p = &temp->right;
|
|
1084
|
|
1085 } else { /* node->key == temp->key */
|
|
1086
|
|
1087 file = (ngx_cached_open_file_t *) node;
|
|
1088 file_temp = (ngx_cached_open_file_t *) temp;
|
|
1089
|
|
1090 p = (ngx_strcmp(file->name, file_temp->name) < 0)
|
|
1091 ? &temp->left : &temp->right;
|
|
1092 }
|
|
1093
|
|
1094 if (*p == sentinel) {
|
|
1095 break;
|
|
1096 }
|
|
1097
|
|
1098 temp = *p;
|
|
1099 }
|
|
1100
|
|
1101 *p = node;
|
|
1102 node->parent = temp;
|
|
1103 node->left = sentinel;
|
|
1104 node->right = sentinel;
|
|
1105 ngx_rbt_red(node);
|
|
1106 }
|
|
1107
|
|
1108
|
358
|
1109 static ngx_cached_open_file_t *
|
|
1110 ngx_open_file_lookup(ngx_open_file_cache_t *cache, ngx_str_t *name,
|
|
1111 uint32_t hash)
|
|
1112 {
|
|
1113 ngx_int_t rc;
|
|
1114 ngx_rbtree_node_t *node, *sentinel;
|
|
1115 ngx_cached_open_file_t *file;
|
|
1116
|
|
1117 node = cache->rbtree.root;
|
|
1118 sentinel = cache->rbtree.sentinel;
|
|
1119
|
|
1120 while (node != sentinel) {
|
|
1121
|
|
1122 if (hash < node->key) {
|
|
1123 node = node->left;
|
|
1124 continue;
|
|
1125 }
|
|
1126
|
|
1127 if (hash > node->key) {
|
|
1128 node = node->right;
|
|
1129 continue;
|
|
1130 }
|
|
1131
|
|
1132 /* hash == node->key */
|
|
1133
|
|
1134 do {
|
|
1135 file = (ngx_cached_open_file_t *) node;
|
|
1136
|
|
1137 rc = ngx_strcmp(name->data, file->name);
|
|
1138
|
|
1139 if (rc == 0) {
|
|
1140 return file;
|
|
1141 }
|
|
1142
|
|
1143 node = (rc < 0) ? node->left : node->right;
|
|
1144
|
|
1145 } while (node != sentinel && hash == node->key);
|
|
1146
|
|
1147 break;
|
|
1148 }
|
|
1149
|
|
1150 return NULL;
|
|
1151 }
|
|
1152
|
|
1153
|
332
|
1154 static void
|
|
1155 ngx_open_file_cache_remove(ngx_event_t *ev)
|
|
1156 {
|
|
1157 ngx_cached_open_file_t *file;
|
|
1158 ngx_open_file_cache_event_t *fev;
|
|
1159
|
|
1160 fev = ev->data;
|
|
1161 file = fev->file;
|
|
1162
|
358
|
1163 ngx_queue_remove(&file->queue);
|
332
|
1164
|
|
1165 ngx_rbtree_delete(&fev->cache->rbtree, &file->node);
|
|
1166
|
|
1167 fev->cache->current--;
|
|
1168
|
|
1169 /* NGX_ONESHOT_EVENT was already deleted */
|
|
1170 file->event = NULL;
|
384
|
1171 file->use_event = 0;
|
332
|
1172
|
|
1173 file->close = 1;
|
|
1174
|
358
|
1175 ngx_close_cached_file(fev->cache, file, 0, ev->log);
|
332
|
1176
|
|
1177 /* free memory only when fev->cache and fev->file are already not needed */
|
|
1178
|
|
1179 ngx_free(ev->data);
|
|
1180 ngx_free(ev);
|
|
1181 }
|