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332
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1
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2 /*
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3 * Copyright (C) Igor Sysoev
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4 */
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5
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6
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7 #include <ngx_config.h>
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8 #include <ngx_core.h>
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9 #include <ngx_event.h>
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10
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11
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12 /*
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13 * open file cache caches
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14 * open file handles with stat() info;
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15 * directories stat() info;
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16 * files and directories errors: not found, access denied, etc.
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17 */
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18
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19
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20 static void ngx_open_file_cache_cleanup(void *data);
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21 static void ngx_open_file_cleanup(void *data);
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22 static void ngx_close_cached_file(ngx_open_file_cache_t *cache,
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23 ngx_cached_open_file_t *file, ngx_log_t *log);
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24 static ngx_int_t ngx_open_and_stat_file(u_char *name, ngx_open_file_info_t *of,
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25 ngx_log_t *log);
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26 static void ngx_expire_old_cached_files(ngx_open_file_cache_t *cache,
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27 ngx_uint_t n, ngx_log_t *log);
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28 static void ngx_open_file_cache_rbtree_insert_value(ngx_rbtree_node_t *temp,
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29 ngx_rbtree_node_t *node, ngx_rbtree_node_t *sentinel);
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30 static void ngx_open_file_cache_remove(ngx_event_t *ev);
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31
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32
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33 ngx_open_file_cache_t *
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34 ngx_open_file_cache_init(ngx_pool_t *pool, ngx_uint_t max, time_t inactive)
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35 {
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36 ngx_rbtree_node_t *sentinel;
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37 ngx_pool_cleanup_t *cln;
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38 ngx_open_file_cache_t *cache;
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39
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40 cache = ngx_palloc(pool, sizeof(ngx_open_file_cache_t));
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41 if (cache == NULL) {
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42 return NULL;
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43 }
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44
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45 cache->list_head.prev = NULL;
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46 cache->list_head.next = &cache->list_tail;
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47
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48 cache->list_tail.prev = &cache->list_head;
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49 cache->list_tail.next = NULL;
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50
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51 sentinel = ngx_palloc(pool, sizeof(ngx_rbtree_node_t));
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52 if (sentinel == NULL) {
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53 return NULL;
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54 }
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55
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356
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56 ngx_rbtree_init(&cache->rbtree, sentinel,
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57 ngx_open_file_cache_rbtree_insert_value);
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332
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58
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59 cache->current = 0;
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60 cache->max = max;
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61 cache->inactive = inactive;
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62
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63 cln = ngx_pool_cleanup_add(pool, 0);
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64 if (cln == NULL) {
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65 return NULL;
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66 }
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67
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68 cln->handler = ngx_open_file_cache_cleanup;
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69 cln->data = cache;
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70
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71 return cache;
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72 }
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73
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74
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75 static void
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76 ngx_open_file_cache_cleanup(void *data)
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77 {
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78 ngx_open_file_cache_t *cache = data;
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79
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80 ngx_cached_open_file_t *file;
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81
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82 ngx_log_debug0(NGX_LOG_DEBUG_CORE, ngx_cycle->log, 0,
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83 "open file cache cleanup");
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84
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85 for ( ;; ) {
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86
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87 file = cache->list_tail.prev;
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88
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89 if (file == &cache->list_head) {
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90 break;
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91 }
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92
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93 file->next->prev = file->prev;
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94 file->prev->next = file->next;
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95
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96 ngx_rbtree_delete(&cache->rbtree, &file->node);
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97
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98 cache->current--;
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99
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100 ngx_log_debug1(NGX_LOG_DEBUG_CORE, ngx_cycle->log, 0,
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101 "delete cached open file: %s", file->name);
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102
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103 if (!file->err && !file->is_dir) {
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104 file->close = 1;
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105 file->count = 0;
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106 ngx_close_cached_file(cache, file, ngx_cycle->log);
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107
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108 } else {
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109 ngx_free(file->name);
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110 ngx_free(file);
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111 }
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112 }
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113
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114 if (cache->current) {
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115 ngx_log_error(NGX_LOG_ALERT, ngx_cycle->log, 0,
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116 "%d items still leave in open file cache",
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117 cache->current);
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118 }
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119
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120 if (cache->rbtree.root != cache->rbtree.sentinel) {
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121 ngx_log_error(NGX_LOG_ALERT, ngx_cycle->log, 0,
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122 "rbtree still is not empty in open file cache");
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123
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124 }
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125 }
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126
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127
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128 ngx_int_t
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129 ngx_open_cached_file(ngx_open_file_cache_t *cache, ngx_str_t *name,
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130 ngx_open_file_info_t *of, ngx_pool_t *pool)
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131 {
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132 time_t now;
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133 uint32_t hash;
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134 ngx_int_t rc;
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135 ngx_rbtree_node_t *node, *sentinel;
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136 ngx_pool_cleanup_t *cln;
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137 ngx_cached_open_file_t *file;
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138 ngx_pool_cleanup_file_t *clnf;
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139 ngx_open_file_cache_event_t *fev;
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140 ngx_open_file_cache_cleanup_t *ofcln;
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141
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142 of->err = 0;
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143
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144 if (cache == NULL) {
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145
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146 cln = ngx_pool_cleanup_add(pool, sizeof(ngx_pool_cleanup_file_t));
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147 if (cln == NULL) {
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148 return NGX_ERROR;
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149 }
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150
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151 rc = ngx_open_and_stat_file(name->data, of, pool->log);
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152
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153 if (rc == NGX_OK && !of->is_dir) {
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154 cln->handler = ngx_pool_cleanup_file;
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155 clnf = cln->data;
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156
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157 clnf->fd = of->fd;
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158 clnf->name = name->data;
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159 clnf->log = pool->log;
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160 }
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161
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162 return rc;
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163 }
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164
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165 cln = ngx_pool_cleanup_add(pool, sizeof(ngx_open_file_cache_cleanup_t));
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166 if (cln == NULL) {
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167 return NGX_ERROR;
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168 }
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169
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170 hash = ngx_crc32_long(name->data, name->len);
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171
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172 node = cache->rbtree.root;
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173 sentinel = cache->rbtree.sentinel;
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174
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175 now = ngx_time();
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176
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177 while (node != sentinel) {
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178
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179 if (hash < node->key) {
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180 node = node->left;
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181 continue;
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182 }
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183
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184 if (hash > node->key) {
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185 node = node->right;
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186 continue;
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187 }
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188
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189 /* hash == node->key */
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190
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191 do {
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192 file = (ngx_cached_open_file_t *) node;
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193
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194 rc = ngx_strcmp(name->data, file->name);
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195
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196 if (rc == 0) {
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197
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198 file->next->prev = file->prev;
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199 file->prev->next = file->next;
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200
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201 if (file->event || now - file->created < of->retest) {
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202 if (file->err == 0) {
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203 of->fd = file->fd;
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204 of->uniq = file->uniq;
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205 of->mtime = file->mtime;
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206 of->size = file->size;
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207
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208 of->is_dir = file->is_dir;
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209 of->is_file = file->is_file;
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210 of->is_link = file->is_link;
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211 of->is_exec = file->is_exec;
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212
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213 if (!file->is_dir) {
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214 file->count++;
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215 }
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216
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217 } else {
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218 of->err = file->err;
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219 }
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220
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221 goto found;
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222 }
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223
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224 ngx_log_debug4(NGX_LOG_DEBUG_CORE, pool->log, 0,
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225 "retest open file: %s, fd:%d, c:%d, e:%d",
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226 file->name, file->fd, file->count, file->err);
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227
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228 if (file->is_dir) {
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229
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230 /*
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231 * chances that directory became file are very small
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232 * so test_dir flag allows to use a single ngx_file_info()
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233 * syscall instead of three syscalls
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234 */
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235
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236 of->test_dir = 1;
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237 }
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238
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239 rc = ngx_open_and_stat_file(name->data, of, pool->log);
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240
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241 if (rc != NGX_OK && (of->err == 0 || !of->errors)) {
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242 goto failed;
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243 }
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244
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245 if (of->is_dir) {
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246 if (file->is_dir || file->err) {
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247 goto update;
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248 }
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249
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250 /* file became directory */
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251
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252 } else if (of->err == 0) { /* file */
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253
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254 if (file->is_dir || file->err) {
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255 goto update;
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256 }
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257
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258 if (of->uniq == file->uniq
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259 && of->mtime == file->mtime
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260 && of->size == file->size)
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261 {
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262 if (ngx_close_file(of->fd) == NGX_FILE_ERROR) {
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263 ngx_log_error(NGX_LOG_ALERT, pool->log, ngx_errno,
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264 ngx_close_file_n " \"%s\" failed",
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265 name->data);
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266 }
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267
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268 of->fd = file->fd;
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269 file->count++;
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270
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271 goto renew;
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272 }
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273
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274 /* file was changed */
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275
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276 } else { /* error to cache */
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277
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278 if (file->err || file->is_dir) {
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279 goto update;
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280 }
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281
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282 /* file was removed, etc. */
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283 }
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284
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285 if (file->count == 0) {
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286 if (ngx_close_file(file->fd) == NGX_FILE_ERROR) {
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287 ngx_log_error(NGX_LOG_ALERT, pool->log, ngx_errno,
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288 ngx_close_file_n " \"%s\" failed",
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289 name->data);
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290 }
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291
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292 goto update;
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293 }
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294
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295 ngx_rbtree_delete(&cache->rbtree, &file->node);
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296
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297 cache->current--;
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298
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299 file->close = 1;
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300
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301 goto create;
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302 }
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303
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304 node = (rc < 0) ? node->left : node->right;
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305
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306 } while (node != sentinel && hash == node->key);
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307
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308 break;
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309 }
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310
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311 /* not found */
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312
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313 file = NULL;
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314
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315 rc = ngx_open_and_stat_file(name->data, of, pool->log);
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316
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317 if (rc != NGX_OK && (of->err == 0 || !of->errors)) {
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318 goto failed;
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319 }
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320
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321 create:
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322
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323 if (cache->current >= cache->max) {
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324 ngx_expire_old_cached_files(cache, 0, pool->log);
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325 }
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326
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327 file = ngx_alloc(sizeof(ngx_cached_open_file_t), pool->log);
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328
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329 if (file == NULL) {
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330 goto failed;
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331 }
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332
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333 file->name = ngx_alloc(name->len + 1, pool->log);
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334
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335 if (file->name == NULL) {
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336 ngx_free(file);
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337 file = NULL;
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338 goto failed;
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339 }
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340
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341 ngx_cpystrn(file->name, name->data, name->len + 1);
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342
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343 file->node.key = hash;
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344
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345 ngx_rbtree_insert(&cache->rbtree, &file->node);
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346
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347 cache->current++;
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348
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349 file->count = 0;
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350
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351 update:
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352
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353 if (of->events
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354 && (ngx_event_flags & NGX_USE_VNODE_EVENT)
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355 && of->fd != NGX_INVALID_FILE)
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356 {
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357 file->event = ngx_calloc(sizeof(ngx_event_t), pool->log);
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358 if (file->event== NULL) {
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359 goto failed;
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360 }
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361
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362 fev = ngx_alloc(sizeof(ngx_open_file_cache_event_t), pool->log);
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363 if (fev == NULL) {
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364 goto failed;
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365 }
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366
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367 fev->fd = of->fd;
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368 fev->file = file;
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369 fev->cache = cache;
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370
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371 file->event->handler = ngx_open_file_cache_remove;
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372 file->event->data = fev;
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373
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374 /*
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375 * although vnode event may be called while ngx_cycle->poll
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376 * destruction; however, cleanup procedures are run before any
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377 * memory freeing and events will be canceled.
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378 */
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379
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380 file->event->log = ngx_cycle->log;
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381
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382 if (ngx_add_event(file->event, NGX_VNODE_EVENT, NGX_ONESHOT_EVENT)
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383 != NGX_OK)
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384 {
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385 ngx_free(file->event->data);
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386 ngx_free(file->event);
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387 goto failed;
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388 }
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389
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390 } else {
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391 file->event = NULL;
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392 }
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393
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394 file->fd = of->fd;
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395 file->err = of->err;
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396
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397 if (of->err == 0) {
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398 file->uniq = of->uniq;
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399 file->mtime = of->mtime;
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400 file->size = of->size;
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401
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402 file->close = 0;
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403
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404 file->is_dir = of->is_dir;
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405 file->is_file = of->is_file;
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406 file->is_link = of->is_link;
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407 file->is_exec = of->is_exec;
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408
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409 if (!of->is_dir) {
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410 file->count++;
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411 }
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412 }
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413
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414 renew:
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415
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416 file->created = now;
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417
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418 found:
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419
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420 file->accessed = now;
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421
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422 /* add to the inactive list head */
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423
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424 file->next = cache->list_head.next;
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425 file->next->prev = file;
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426 file->prev = &cache->list_head;
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427 cache->list_head.next = file;
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428
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429 ngx_log_debug4(NGX_LOG_DEBUG_CORE, pool->log, 0,
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430 "cached open file: %s, fd:%d, c:%d, e:%d",
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431 file->name, file->fd, file->count, file->err);
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432
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433 if (of->err == 0) {
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434
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|
|
435 if (!of->is_dir) {
|
|
|
436 cln->handler = ngx_open_file_cleanup;
|
|
|
437 ofcln = cln->data;
|
|
|
438
|
|
|
439 ofcln->cache = cache;
|
|
|
440 ofcln->file = file;
|
|
|
441 ofcln->log = pool->log;
|
|
|
442 }
|
|
|
443
|
|
|
444 return NGX_OK;
|
|
|
445 }
|
|
|
446
|
|
|
447 return NGX_ERROR;
|
|
|
448
|
|
|
449 failed:
|
|
|
450
|
|
|
451 if (file && file->count == 0) {
|
|
|
452 ngx_rbtree_delete(&cache->rbtree, &file->node);
|
|
|
453
|
|
|
454 cache->current--;
|
|
|
455
|
|
|
456 if (ngx_close_file(file->fd) == NGX_FILE_ERROR) {
|
|
|
457 ngx_log_error(NGX_LOG_ALERT, pool->log, ngx_errno,
|
|
|
458 ngx_close_file_n " \"%s\" failed", file->name);
|
|
|
459 }
|
|
|
460
|
|
|
461 ngx_free(file->name);
|
|
|
462 ngx_free(file);
|
|
|
463 }
|
|
|
464
|
|
|
465 if (of->fd != NGX_INVALID_FILE) {
|
|
|
466 if (ngx_close_file(of->fd) == NGX_FILE_ERROR) {
|
|
|
467 ngx_log_error(NGX_LOG_ALERT, pool->log, ngx_errno,
|
|
|
468 ngx_close_file_n " \"%s\" failed", name->data);
|
|
|
469 }
|
|
|
470 }
|
|
|
471
|
|
|
472 return NGX_ERROR;
|
|
|
473 }
|
|
|
474
|
|
|
475
|
|
|
476 static ngx_int_t
|
|
|
477 ngx_open_and_stat_file(u_char *name, ngx_open_file_info_t *of, ngx_log_t *log)
|
|
|
478 {
|
|
|
479 ngx_fd_t fd;
|
|
|
480 ngx_file_info_t fi;
|
|
|
481
|
|
|
482 of->fd = NGX_INVALID_FILE;
|
|
|
483
|
|
|
484 if (of->test_dir) {
|
|
|
485
|
|
|
486 if (ngx_file_info(name, &fi) == -1) {
|
|
|
487 of->err = ngx_errno;
|
|
|
488
|
|
|
489 return NGX_ERROR;
|
|
|
490 }
|
|
|
491
|
|
|
492 of->uniq = ngx_file_uniq(&fi);
|
|
|
493 of->mtime = ngx_file_mtime(&fi);
|
|
|
494 of->size = ngx_file_size(&fi);
|
|
|
495 of->is_dir = ngx_is_dir(&fi);
|
|
|
496 of->is_file = ngx_is_file(&fi);
|
|
|
497 of->is_link = ngx_is_link(&fi);
|
|
|
498 of->is_exec = ngx_is_exec(&fi);
|
|
|
499
|
|
|
500 if (of->is_dir) {
|
|
|
501 return NGX_OK;
|
|
|
502 }
|
|
|
503 }
|
|
|
504
|
|
|
505 fd = ngx_open_file(name, NGX_FILE_RDONLY, NGX_FILE_OPEN, 0);
|
|
|
506
|
|
|
507 if (fd == NGX_INVALID_FILE) {
|
|
|
508 of->err = ngx_errno;
|
|
|
509 return NGX_ERROR;
|
|
|
510 }
|
|
|
511
|
|
|
512 if (ngx_fd_info(fd, &fi) == NGX_FILE_ERROR) {
|
|
|
513 ngx_log_error(NGX_LOG_CRIT, log, ngx_errno,
|
|
|
514 ngx_fd_info_n " \"%s\" failed", name);
|
|
|
515
|
|
|
516 if (ngx_close_file(fd) == NGX_FILE_ERROR) {
|
|
|
517 ngx_log_error(NGX_LOG_ALERT, log, ngx_errno,
|
|
|
518 ngx_close_file_n " \"%s\" failed", name);
|
|
|
519 }
|
|
|
520
|
|
|
521 return NGX_ERROR;
|
|
|
522 }
|
|
|
523
|
|
|
524 if (ngx_is_dir(&fi)) {
|
|
|
525 if (ngx_close_file(fd) == NGX_FILE_ERROR) {
|
|
|
526 ngx_log_error(NGX_LOG_ALERT, log, ngx_errno,
|
|
|
527 ngx_close_file_n " \"%s\" failed", name);
|
|
|
528 }
|
|
|
529
|
|
|
530 fd = NGX_INVALID_FILE;
|
|
|
531 }
|
|
|
532
|
|
|
533 of->fd = fd;
|
|
|
534 of->uniq = ngx_file_uniq(&fi);
|
|
|
535 of->mtime = ngx_file_mtime(&fi);
|
|
|
536 of->size = ngx_file_size(&fi);
|
|
|
537 of->is_dir = ngx_is_dir(&fi);
|
|
|
538 of->is_file = ngx_is_file(&fi);
|
|
|
539 of->is_link = ngx_is_link(&fi);
|
|
|
540 of->is_exec = ngx_is_exec(&fi);
|
|
|
541
|
|
|
542 return NGX_OK;
|
|
|
543 }
|
|
|
544
|
|
|
545
|
|
|
546 static void
|
|
|
547 ngx_open_file_cleanup(void *data)
|
|
|
548 {
|
|
|
549 ngx_open_file_cache_cleanup_t *c = data;
|
|
|
550
|
|
|
551 c->file->count--;
|
|
|
552
|
|
|
553 ngx_close_cached_file(c->cache, c->file, c->log);
|
|
|
554
|
|
|
555 /* drop one or two expired open files */
|
|
|
556 ngx_expire_old_cached_files(c->cache, 1, c->log);
|
|
|
557 }
|
|
|
558
|
|
|
559
|
|
|
560 static void
|
|
|
561 ngx_close_cached_file(ngx_open_file_cache_t *cache,
|
|
|
562 ngx_cached_open_file_t *file, ngx_log_t *log)
|
|
|
563 {
|
|
|
564 ngx_log_debug4(NGX_LOG_DEBUG_CORE, log, 0,
|
|
|
565 "close cached open file: %s, fd:%d, c:%d, %d",
|
|
|
566 file->name, file->fd, file->count, file->close);
|
|
|
567
|
|
|
568 if (!file->close) {
|
|
|
569
|
|
|
570 file->accessed = ngx_time();
|
|
|
571
|
|
|
572 if (cache->list_head.next != file) {
|
|
|
573
|
|
|
574 /* delete from inactive list */
|
|
|
575
|
|
|
576 file->next->prev = file->prev;
|
|
|
577 file->prev->next = file->next;
|
|
|
578
|
|
|
579 /* add to the inactive list head */
|
|
|
580
|
|
|
581 file->next = cache->list_head.next;
|
|
|
582 file->next->prev = file;
|
|
|
583 file->prev = &cache->list_head;
|
|
|
584 cache->list_head.next = file;
|
|
|
585 }
|
|
|
586
|
|
|
587 return;
|
|
|
588 }
|
|
|
589
|
|
|
590 if (file->event) {
|
|
|
591 (void) ngx_del_event(file->event, NGX_VNODE_EVENT,
|
|
|
592 file->count ? NGX_FLUSH_EVENT : NGX_CLOSE_EVENT);
|
|
|
593
|
|
|
594 ngx_free(file->event->data);
|
|
|
595 ngx_free(file->event);
|
|
|
596 file->event = NULL;
|
|
|
597 }
|
|
|
598
|
|
|
599 if (file->count) {
|
|
|
600 return;
|
|
|
601 }
|
|
|
602
|
|
|
603 if (ngx_close_file(file->fd) == NGX_FILE_ERROR) {
|
|
|
604 ngx_log_error(NGX_LOG_ALERT, log, ngx_errno,
|
|
|
605 ngx_close_file_n " \"%s\" failed", file->name);
|
|
|
606 }
|
|
|
607
|
|
|
608 ngx_free(file->name);
|
|
|
609 ngx_free(file);
|
|
|
610 }
|
|
|
611
|
|
|
612
|
|
|
613 static void
|
|
|
614 ngx_expire_old_cached_files(ngx_open_file_cache_t *cache, ngx_uint_t n,
|
|
|
615 ngx_log_t *log)
|
|
|
616 {
|
|
|
617 time_t now;
|
|
|
618 ngx_cached_open_file_t *file;
|
|
|
619
|
|
|
620 now = ngx_time();
|
|
|
621
|
|
|
622 /*
|
|
|
623 * n == 1 deletes one or two inactive files
|
|
|
624 * n == 0 deletes least recently used file by force
|
|
|
625 * and one or two inactive files
|
|
|
626 */
|
|
|
627
|
|
|
628 while (n < 3) {
|
|
|
629
|
|
|
630 file = cache->list_tail.prev;
|
|
|
631
|
|
|
632 if (file == &cache->list_head) {
|
|
|
633 return;
|
|
|
634 }
|
|
|
635
|
|
|
636 if (n++ != 0 && now - file->accessed <= cache->inactive) {
|
|
|
637 return;
|
|
|
638 }
|
|
|
639
|
|
|
640 file->next->prev = file->prev;
|
|
|
641 file->prev->next = file->next;
|
|
|
642
|
|
|
643 ngx_rbtree_delete(&cache->rbtree, &file->node);
|
|
|
644
|
|
|
645 cache->current--;
|
|
|
646
|
|
|
647 ngx_log_debug1(NGX_LOG_DEBUG_CORE, log, 0,
|
|
|
648 "expire cached open file: %s", file->name);
|
|
|
649
|
|
|
650 if (!file->err && !file->is_dir) {
|
|
|
651 file->close = 1;
|
|
|
652 ngx_close_cached_file(cache, file, log);
|
|
|
653
|
|
|
654 } else {
|
|
|
655 ngx_free(file->name);
|
|
|
656 ngx_free(file);
|
|
|
657 }
|
|
|
658 }
|
|
|
659 }
|
|
|
660
|
|
|
661
|
|
|
662 static void
|
|
|
663 ngx_open_file_cache_rbtree_insert_value(ngx_rbtree_node_t *temp,
|
|
|
664 ngx_rbtree_node_t *node, ngx_rbtree_node_t *sentinel)
|
|
|
665 {
|
|
|
666 ngx_rbtree_node_t **p;
|
|
|
667 ngx_cached_open_file_t *file, *file_temp;
|
|
|
668
|
|
|
669 for ( ;; ) {
|
|
|
670
|
|
|
671 if (node->key < temp->key) {
|
|
|
672
|
|
|
673 p = &temp->left;
|
|
|
674
|
|
|
675 } else if (node->key > temp->key) {
|
|
|
676
|
|
|
677 p = &temp->right;
|
|
|
678
|
|
|
679 } else { /* node->key == temp->key */
|
|
|
680
|
|
|
681 file = (ngx_cached_open_file_t *) node;
|
|
|
682 file_temp = (ngx_cached_open_file_t *) temp;
|
|
|
683
|
|
|
684 p = (ngx_strcmp(file->name, file_temp->name) < 0)
|
|
|
685 ? &temp->left : &temp->right;
|
|
|
686 }
|
|
|
687
|
|
|
688 if (*p == sentinel) {
|
|
|
689 break;
|
|
|
690 }
|
|
|
691
|
|
|
692 temp = *p;
|
|
|
693 }
|
|
|
694
|
|
|
695 *p = node;
|
|
|
696 node->parent = temp;
|
|
|
697 node->left = sentinel;
|
|
|
698 node->right = sentinel;
|
|
|
699 ngx_rbt_red(node);
|
|
|
700 }
|
|
|
701
|
|
|
702
|
|
|
703 static void
|
|
|
704 ngx_open_file_cache_remove(ngx_event_t *ev)
|
|
|
705 {
|
|
|
706 ngx_cached_open_file_t *file;
|
|
|
707 ngx_open_file_cache_event_t *fev;
|
|
|
708
|
|
|
709 fev = ev->data;
|
|
|
710 file = fev->file;
|
|
|
711
|
|
|
712 file->next->prev = file->prev;
|
|
|
713 file->prev->next = file->next;
|
|
|
714
|
|
|
715 ngx_rbtree_delete(&fev->cache->rbtree, &file->node);
|
|
|
716
|
|
|
717 fev->cache->current--;
|
|
|
718
|
|
|
719 /* NGX_ONESHOT_EVENT was already deleted */
|
|
|
720 file->event = NULL;
|
|
|
721
|
|
|
722 file->close = 1;
|
|
|
723
|
|
|
724 ngx_close_cached_file(fev->cache, file, ev->log);
|
|
|
725
|
|
|
726 /* free memory only when fev->cache and fev->file are already not needed */
|
|
|
727
|
|
|
728 ngx_free(ev->data);
|
|
|
729 ngx_free(ev);
|
|
|
730 }
|
