6103
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1
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2 /*
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3 * Copyright (C) Ruslan Ermilov
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4 * Copyright (C) Nginx, Inc.
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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_http.h>
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11
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12
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13 static char *ngx_http_upstream_zone(ngx_conf_t *cf, ngx_command_t *cmd,
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14 void *conf);
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15 static ngx_int_t ngx_http_upstream_init_zone(ngx_shm_zone_t *shm_zone,
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16 void *data);
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17
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18
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19 static ngx_command_t ngx_http_upstream_zone_commands[] = {
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20
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21 { ngx_string("zone"),
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22 NGX_HTTP_UPS_CONF|NGX_CONF_TAKE2,
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23 ngx_http_upstream_zone,
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24 0,
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25 0,
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26 NULL },
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27
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28 ngx_null_command
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29 };
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30
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31
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32 static ngx_http_module_t ngx_http_upstream_zone_module_ctx = {
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33 NULL, /* preconfiguration */
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34 NULL, /* postconfiguration */
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35
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36 NULL, /* create main configuration */
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37 NULL, /* init main configuration */
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38
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39 NULL, /* create server configuration */
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40 NULL, /* merge server configuration */
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41
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42 NULL, /* create location configuration */
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43 NULL /* merge location configuration */
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44 };
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45
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46
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47 ngx_module_t ngx_http_upstream_zone_module = {
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48 NGX_MODULE_V1,
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49 &ngx_http_upstream_zone_module_ctx, /* module context */
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50 ngx_http_upstream_zone_commands, /* module directives */
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51 NGX_HTTP_MODULE, /* module type */
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52 NULL, /* init master */
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53 NULL, /* init module */
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54 NULL, /* init process */
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55 NULL, /* init thread */
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56 NULL, /* exit thread */
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57 NULL, /* exit process */
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58 NULL, /* exit master */
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59 NGX_MODULE_V1_PADDING
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60 };
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61
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62
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63 static char *
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64 ngx_http_upstream_zone(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
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65 {
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66 ngx_http_upstream_srv_conf_t *uscf;
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67 ssize_t size;
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68 ngx_str_t *value;
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69
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70 uscf = ngx_http_conf_get_module_srv_conf(cf, ngx_http_upstream_module);
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71
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72 value = cf->args->elts;
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73
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74 if (!value[1].len) {
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75 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
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76 "invalid zone name \"%V\"", &value[1]);
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77 return NGX_CONF_ERROR;
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78 }
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79
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80 size = ngx_parse_size(&value[2]);
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81
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82 if (size == NGX_ERROR) {
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83 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
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84 "invalid zone size \"%V\"", &value[2]);
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85 return NGX_CONF_ERROR;
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86 }
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87
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88 if (size < (ssize_t) (8 * ngx_pagesize)) {
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89 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
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90 "zone \"%V\" is too small", &value[1]);
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91 return NGX_CONF_ERROR;
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92 }
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93
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94 uscf->shm_zone = ngx_shared_memory_add(cf, &value[1], size,
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95 &ngx_http_upstream_module);
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96 if (uscf->shm_zone == NULL) {
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97 return NGX_CONF_ERROR;
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98 }
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99
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100 if (uscf->shm_zone->data) {
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101 uscf = uscf->shm_zone->data;
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102
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103 ngx_conf_log_error(NGX_LOG_WARN, cf, 0,
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104 "upstream \"%V\" in %s:%ui "
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105 "is already bound to zone \"%V\"",
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106 &uscf->host, uscf->file_name, uscf->line,
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107 &value[1]);
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108 return NGX_CONF_ERROR;
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109 }
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110
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111 uscf->shm_zone->init = ngx_http_upstream_init_zone;
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112 uscf->shm_zone->data = uscf;
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113
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114 uscf->shm_zone->noreuse = 1;
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115
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116 return NGX_CONF_OK;
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117 }
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118
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119
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120 static ngx_int_t
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121 ngx_http_upstream_init_zone(ngx_shm_zone_t *shm_zone, void *data)
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122 {
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123 ngx_http_upstream_srv_conf_t *ouscf = data;
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124
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125 size_t len;
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126 ngx_slab_pool_t *shpool;
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127 ngx_http_upstream_rr_peer_t *peer, **peerp;
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128 ngx_http_upstream_rr_peers_t *peers, *backup;
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129 ngx_http_upstream_srv_conf_t *uscf;
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130
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131 uscf = shm_zone->data;
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132
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133 if (ouscf) {
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134 ngx_log_error(NGX_LOG_EMERG, shm_zone->shm.log, 0,
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135 "zone \"%V\" cannot be reused", &shm_zone->shm.name);
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136 return NGX_ERROR;
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137 }
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138
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139 shpool = (ngx_slab_pool_t *) shm_zone->shm.addr;
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140
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141 if (shm_zone->shm.exists) {
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142 return NGX_ERROR;
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143 }
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144
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145
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146 /* copy peers to shared memory */
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147
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148 len = sizeof(" in upstream zone \"\"") + shm_zone->shm.name.len;
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149
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150 shpool->log_ctx = ngx_slab_alloc(shpool, len);
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151 if (shpool->log_ctx == NULL) {
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152 return NGX_ERROR;
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153 }
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154
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155 ngx_sprintf(shpool->log_ctx, " in upstream zone \"%V\"%Z",
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156 &shm_zone->shm.name);
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157
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158 peers = ngx_slab_alloc(shpool, sizeof(ngx_http_upstream_rr_peers_t));
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159 if (peers == NULL) {
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160 return NGX_ERROR;
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161 }
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162
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163 ngx_memcpy(peers, uscf->peer.data, sizeof(ngx_http_upstream_rr_peers_t));
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164
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165 peers->shpool = shpool;
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166
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167 for (peerp = &peers->peer; *peerp; peerp = &peer->next) {
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168 /* pool is unlocked */
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169 peer = ngx_slab_calloc_locked(shpool,
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170 sizeof(ngx_http_upstream_rr_peer_t));
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171 if (peer == NULL) {
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172 return NGX_ERROR;
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173 }
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174
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175 ngx_memcpy(peer, *peerp, sizeof(ngx_http_upstream_rr_peer_t));
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176
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177 *peerp = peer;
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178 }
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179
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180 if (peers->next == NULL) {
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181 goto done;
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182 }
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183
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184 backup = ngx_slab_alloc(shpool, sizeof(ngx_http_upstream_rr_peers_t));
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185 if (backup == NULL) {
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186 return NGX_ERROR;
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187 }
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188
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189 ngx_memcpy(backup, peers->next, sizeof(ngx_http_upstream_rr_peers_t));
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190
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191 backup->shpool = shpool;
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192
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193 for (peerp = &backup->peer; *peerp; peerp = &peer->next) {
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194 /* pool is unlocked */
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195 peer = ngx_slab_calloc_locked(shpool,
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196 sizeof(ngx_http_upstream_rr_peer_t));
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197 if (peer == NULL) {
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198 return NGX_ERROR;
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199 }
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200
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201 ngx_memcpy(peer, *peerp, sizeof(ngx_http_upstream_rr_peer_t));
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202
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203 *peerp = peer;
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204 }
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205
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206 peers->next = backup;
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207
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208 done:
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209
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210 uscf->peer.data = peers;
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211
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212 return NGX_OK;
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213 }
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