Mercurial > hg > nginx
annotate src/core/ngx_output_chain.c @ 4450:4919fb357a5d stable-1.0
Merge of r4406, r4413: copyrights updated.
author | Maxim Dounin <mdounin@mdounin.ru> |
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date | Sun, 05 Feb 2012 20:02:59 +0000 |
parents | 7450029ff51e |
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rev | line source |
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1 |
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2 /* |
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3 * Copyright (C) Igor Sysoev |
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4 * Copyright (C) Nginx, Inc. |
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5 */ |
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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 |
469 | 13 #if 0 |
14 #define NGX_SENDFILE_LIMIT 4096 | |
15 #endif | |
16 | |
2316 | 17 /* |
18 * When DIRECTIO is enabled FreeBSD, Solaris, and MacOSX read directly | |
19 * to an application memory from a device if parameters are aligned | |
3053 | 20 * to device sector boundary (512 bytes). They fallback to usual read |
2316 | 21 * operation if the parameters are not aligned. |
22 * Linux allows DIRECTIO only if the parameters are aligned to a filesystem | |
23 * sector boundary, otherwise it returns EINVAL. The sector size is | |
24 * usually 512 bytes, however, on XFS it may be 4096 bytes. | |
25 */ | |
469 | 26 |
27 #define NGX_NONE 1 | |
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28 |
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29 |
467 | 30 static ngx_inline ngx_int_t |
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31 ngx_output_chain_as_is(ngx_output_chain_ctx_t *ctx, ngx_buf_t *buf); |
469 | 32 static ngx_int_t ngx_output_chain_add_copy(ngx_pool_t *pool, |
499 | 33 ngx_chain_t **chain, ngx_chain_t *in); |
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34 static ngx_int_t ngx_output_chain_align_file_buf(ngx_output_chain_ctx_t *ctx, |
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35 off_t bsize); |
2230 | 36 static ngx_int_t ngx_output_chain_get_buf(ngx_output_chain_ctx_t *ctx, |
37 off_t bsize); | |
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38 static ngx_int_t ngx_output_chain_copy_buf(ngx_output_chain_ctx_t *ctx); |
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39 |
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40 |
499 | 41 ngx_int_t |
42 ngx_output_chain(ngx_output_chain_ctx_t *ctx, ngx_chain_t *in) | |
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43 { |
473 | 44 off_t bsize; |
597 | 45 ngx_int_t rc, last; |
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46 ngx_chain_t *cl, *out, **last_out; |
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47 |
455 | 48 if (ctx->in == NULL && ctx->busy == NULL) { |
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49 |
469 | 50 /* |
51 * the short path for the case when the ctx->in and ctx->busy chains | |
52 * are empty, the incoming chain is empty too or has the single buf | |
53 * that does not require the copy | |
54 */ | |
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55 |
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56 if (in == NULL) { |
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57 return ctx->output_filter(ctx->filter_ctx, in); |
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58 } |
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59 |
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60 if (in->next == NULL |
469 | 61 #if (NGX_SENDFILE_LIMIT) |
62 && !(in->buf->in_file && in->buf->file_last > NGX_SENDFILE_LIMIT) | |
63 #endif | |
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64 && ngx_output_chain_as_is(ctx, in->buf)) |
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65 { |
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66 return ctx->output_filter(ctx->filter_ctx, in); |
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67 } |
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68 } |
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69 |
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70 /* add the incoming buf to the chain ctx->in */ |
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71 |
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72 if (in) { |
469 | 73 if (ngx_output_chain_add_copy(ctx->pool, &ctx->in, in) == NGX_ERROR) { |
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74 return NGX_ERROR; |
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75 } |
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76 } |
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77 |
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78 out = NULL; |
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79 last_out = &out; |
499 | 80 last = NGX_NONE; |
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81 |
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82 for ( ;; ) { |
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83 |
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84 #if (NGX_HAVE_FILE_AIO) |
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85 if (ctx->aio) { |
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86 return NGX_AGAIN; |
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87 } |
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88 #endif |
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89 |
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90 while (ctx->in) { |
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91 |
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92 /* |
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93 * cycle while there are the ctx->in bufs |
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94 * and there are the free output bufs to copy in |
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95 */ |
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96 |
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97 bsize = ngx_buf_size(ctx->in->buf); |
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98 |
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99 if (bsize == 0 && !ngx_buf_special(ctx->in->buf)) { |
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100 |
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101 ngx_log_error(NGX_LOG_ALERT, ctx->pool->log, 0, |
483 | 102 "zero size buf in output " |
103 "t:%d r:%d f:%d %p %p-%p %p %O-%O", | |
104 ctx->in->buf->temporary, | |
105 ctx->in->buf->recycled, | |
106 ctx->in->buf->in_file, | |
107 ctx->in->buf->start, | |
108 ctx->in->buf->pos, | |
109 ctx->in->buf->last, | |
110 ctx->in->buf->file, | |
111 ctx->in->buf->file_pos, | |
112 ctx->in->buf->file_last); | |
403
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113 |
473 | 114 ngx_debug_point(); |
115 | |
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116 ctx->in = ctx->in->next; |
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117 |
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118 continue; |
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119 } |
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120 |
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121 if (ngx_output_chain_as_is(ctx, ctx->in->buf)) { |
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122 |
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123 /* move the chain link to the output chain */ |
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124 |
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125 cl = ctx->in; |
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126 ctx->in = cl->next; |
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127 |
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128 *last_out = cl; |
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129 last_out = &cl->next; |
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130 cl->next = NULL; |
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131 |
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132 continue; |
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133 } |
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134 |
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135 if (ctx->buf == NULL) { |
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136 |
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137 rc = ngx_output_chain_align_file_buf(ctx, bsize); |
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138 |
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139 if (rc == NGX_ERROR) { |
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140 return NGX_ERROR; |
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141 } |
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142 |
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143 if (rc != NGX_OK) { |
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144 |
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145 if (ctx->free) { |
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146 |
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147 /* get the free buf */ |
160
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148 |
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149 cl = ctx->free; |
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150 ctx->buf = cl->buf; |
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151 ctx->free = cl->next; |
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152 |
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153 ngx_free_chain(ctx->pool, cl); |
160
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154 |
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155 } else if (out || ctx->allocated == ctx->bufs.num) { |
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156 |
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157 break; |
334
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158 |
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159 } else if (ngx_output_chain_get_buf(ctx, bsize) != NGX_OK) { |
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160 return NGX_ERROR; |
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161 } |
160
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162 } |
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163 } |
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164 |
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165 rc = ngx_output_chain_copy_buf(ctx); |
160
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166 |
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167 if (rc == NGX_ERROR) { |
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168 return rc; |
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169 } |
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170 |
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171 if (rc == NGX_AGAIN) { |
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172 if (out) { |
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173 break; |
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174 } |
430
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175 |
160
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176 return rc; |
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177 } |
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178 |
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179 /* delete the completed buf from the ctx->in chain */ |
160
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180 |
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181 if (ngx_buf_size(ctx->in->buf) == 0) { |
160
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182 ctx->in = ctx->in->next; |
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183 } |
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184 |
501 | 185 cl = ngx_alloc_chain_link(ctx->pool); |
186 if (cl == NULL) { | |
461 | 187 return NGX_ERROR; |
188 } | |
501 | 189 |
461 | 190 cl->buf = ctx->buf; |
191 cl->next = NULL; | |
160
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192 *last_out = cl; |
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193 last_out = &cl->next; |
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194 ctx->buf = NULL; |
160
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195 } |
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196 |
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197 if (out == NULL && last != NGX_NONE) { |
509 | 198 |
199 if (ctx->in) { | |
200 return NGX_AGAIN; | |
201 } | |
202 | |
160
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203 return last; |
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204 } |
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205 |
294
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206 last = ctx->output_filter(ctx->filter_ctx, out); |
160
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207 |
569 | 208 if (last == NGX_ERROR || last == NGX_DONE) { |
209 return last; | |
210 } | |
211 | |
160
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212 ngx_chain_update_chains(&ctx->free, &ctx->busy, &out, ctx->tag); |
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213 last_out = &out; |
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214 } |
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215 } |
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216 |
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217 |
467 | 218 static ngx_inline ngx_int_t |
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219 ngx_output_chain_as_is(ngx_output_chain_ctx_t *ctx, ngx_buf_t *buf) |
160
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220 { |
469 | 221 ngx_uint_t sendfile; |
222 | |
343
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223 if (ngx_buf_special(buf)) { |
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224 return 1; |
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225 } |
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226 |
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227 if (buf->in_file && buf->file->directio) { |
160
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228 return 0; |
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229 } |
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230 |
469 | 231 sendfile = ctx->sendfile; |
232 | |
233 #if (NGX_SENDFILE_LIMIT) | |
234 | |
235 if (buf->in_file && buf->file_pos >= NGX_SENDFILE_LIMIT) { | |
236 sendfile = 0; | |
237 } | |
238 | |
239 #endif | |
240 | |
241 if (!sendfile) { | |
455 | 242 |
343
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243 if (!ngx_buf_in_memory(buf)) { |
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244 return 0; |
170
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245 } |
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246 |
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247 buf->in_file = 0; |
160
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248 } |
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249 |
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250 if (ctx->need_in_memory && !ngx_buf_in_memory(buf)) { |
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251 return 0; |
160
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252 } |
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253 |
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254 if (ctx->need_in_temp && (buf->memory || buf->mmap)) { |
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255 return 0; |
160
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256 } |
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257 |
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258 return 1; |
160
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259 } |
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260 |
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261 |
499 | 262 static ngx_int_t |
263 ngx_output_chain_add_copy(ngx_pool_t *pool, ngx_chain_t **chain, | |
264 ngx_chain_t *in) | |
469 | 265 { |
266 ngx_chain_t *cl, **ll; | |
267 #if (NGX_SENDFILE_LIMIT) | |
268 ngx_buf_t *b, *buf; | |
269 #endif | |
270 | |
271 ll = chain; | |
272 | |
273 for (cl = *chain; cl; cl = cl->next) { | |
274 ll = &cl->next; | |
275 } | |
276 | |
277 while (in) { | |
278 | |
501 | 279 cl = ngx_alloc_chain_link(pool); |
280 if (cl == NULL) { | |
469 | 281 return NGX_ERROR; |
282 } | |
283 | |
284 #if (NGX_SENDFILE_LIMIT) | |
285 | |
286 buf = in->buf; | |
287 | |
288 if (buf->in_file | |
289 && buf->file_pos < NGX_SENDFILE_LIMIT | |
290 && buf->file_last > NGX_SENDFILE_LIMIT) | |
291 { | |
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292 /* split a file buf on two bufs by the sendfile limit */ |
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293 |
501 | 294 b = ngx_calloc_buf(pool); |
295 if (b == NULL) { | |
469 | 296 return NGX_ERROR; |
297 } | |
298 | |
299 ngx_memcpy(b, buf, sizeof(ngx_buf_t)); | |
300 | |
301 if (ngx_buf_in_memory(buf)) { | |
302 buf->pos += (ssize_t) (NGX_SENDFILE_LIMIT - buf->file_pos); | |
303 b->last = buf->pos; | |
304 } | |
305 | |
306 buf->file_pos = NGX_SENDFILE_LIMIT; | |
307 b->file_last = NGX_SENDFILE_LIMIT; | |
308 | |
309 cl->buf = b; | |
310 | |
311 } else { | |
312 cl->buf = buf; | |
313 in = in->next; | |
314 } | |
315 | |
316 #else | |
317 cl->buf = in->buf; | |
318 in = in->next; | |
319 | |
320 #endif | |
321 | |
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322 cl->next = NULL; |
469 | 323 *ll = cl; |
324 ll = &cl->next; | |
325 } | |
326 | |
327 return NGX_OK; | |
328 } | |
329 | |
330 | |
499 | 331 static ngx_int_t |
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332 ngx_output_chain_align_file_buf(ngx_output_chain_ctx_t *ctx, off_t bsize) |
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333 { |
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334 size_t size; |
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335 ngx_buf_t *in; |
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336 |
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337 in = ctx->in->buf; |
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338 |
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339 if (in->file == NULL || !in->file->directio) { |
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340 return NGX_DECLINED; |
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341 } |
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342 |
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343 ctx->directio = 1; |
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344 |
3053 | 345 size = (size_t) (in->file_pos - (in->file_pos & ~(ctx->alignment - 1))); |
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346 |
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347 if (size == 0) { |
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348 |
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349 if (bsize >= (off_t) ctx->bufs.size) { |
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350 return NGX_DECLINED; |
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351 } |
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352 |
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353 size = (size_t) bsize; |
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354 |
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355 } else { |
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356 size = (size_t) ctx->alignment - size; |
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357 |
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358 if ((off_t) size > bsize) { |
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359 size = (size_t) bsize; |
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360 } |
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361 } |
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362 |
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363 ctx->buf = ngx_create_temp_buf(ctx->pool, size); |
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364 if (ctx->buf == NULL) { |
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365 return NGX_ERROR; |
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366 } |
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367 |
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368 /* |
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369 * we do not set ctx->buf->tag, because we do not want |
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370 * to reuse the buf via ctx->free list |
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371 */ |
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372 |
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373 #if (NGX_HAVE_ALIGNED_DIRECTIO) |
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374 ctx->unaligned = 1; |
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375 #endif |
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376 |
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377 return NGX_OK; |
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378 } |
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379 |
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380 |
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381 static ngx_int_t |
2230 | 382 ngx_output_chain_get_buf(ngx_output_chain_ctx_t *ctx, off_t bsize) |
383 { | |
384 size_t size; | |
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385 ngx_buf_t *b, *in; |
2230 | 386 ngx_uint_t recycled; |
387 | |
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388 in = ctx->in->buf; |
2230 | 389 size = ctx->bufs.size; |
390 recycled = 1; | |
391 | |
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392 if (in->last_in_chain) { |
2230 | 393 |
394 if (bsize < (off_t) size) { | |
395 | |
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396 /* |
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397 * allocate a small temp buf for a small last buf |
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398 * or its small last part |
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399 */ |
2230 | 400 |
401 size = (size_t) bsize; | |
402 recycled = 0; | |
403 | |
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404 } else if (!ctx->directio |
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405 && ctx->bufs.num == 1 |
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406 && (bsize < (off_t) (size + size / 4))) |
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407 { |
2230 | 408 /* |
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409 * allocate a temp buf that equals to a last buf, |
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410 * if there is no directio, the last buf size is lesser |
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411 * than 1.25 of bufs.size and the temp buf is single |
2230 | 412 */ |
413 | |
414 size = (size_t) bsize; | |
415 recycled = 0; | |
416 } | |
417 } | |
418 | |
419 b = ngx_calloc_buf(ctx->pool); | |
420 if (b == NULL) { | |
421 return NGX_ERROR; | |
422 } | |
423 | |
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424 if (ctx->directio) { |
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425 |
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426 /* |
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427 * allocate block aligned to a disk sector size to enable |
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428 * userland buffer direct usage conjunctly with directio |
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429 */ |
2230 | 430 |
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431 b->start = ngx_pmemalign(ctx->pool, size, (size_t) ctx->alignment); |
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432 if (b->start == NULL) { |
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433 return NGX_ERROR; |
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434 } |
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435 |
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436 } else { |
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437 b->start = ngx_palloc(ctx->pool, size); |
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438 if (b->start == NULL) { |
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439 return NGX_ERROR; |
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440 } |
2230 | 441 } |
442 | |
443 b->pos = b->start; | |
444 b->last = b->start; | |
445 b->end = b->last + size; | |
446 b->temporary = 1; | |
447 b->tag = ctx->tag; | |
448 b->recycled = recycled; | |
449 | |
450 ctx->buf = b; | |
451 ctx->allocated++; | |
452 | |
453 return NGX_OK; | |
454 } | |
455 | |
456 | |
457 static ngx_int_t | |
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458 ngx_output_chain_copy_buf(ngx_output_chain_ctx_t *ctx) |
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459 { |
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460 off_t size; |
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461 ssize_t n; |
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462 ngx_buf_t *src, *dst; |
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463 ngx_uint_t sendfile; |
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464 |
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465 src = ctx->in->buf; |
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466 dst = ctx->buf; |
160
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467 |
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468 size = ngx_buf_size(src); |
3515 | 469 size = ngx_min(size, dst->end - dst->pos); |
160
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470 |
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471 sendfile = ctx->sendfile & !ctx->directio; |
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472 |
469 | 473 #if (NGX_SENDFILE_LIMIT) |
474 | |
475 if (src->in_file && src->file_pos >= NGX_SENDFILE_LIMIT) { | |
476 sendfile = 0; | |
477 } | |
478 | |
479 #endif | |
480 | |
343
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481 if (ngx_buf_in_memory(src)) { |
473 | 482 ngx_memcpy(dst->pos, src->pos, (size_t) size); |
483 src->pos += (size_t) size; | |
484 dst->last += (size_t) size; | |
160
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485 |
455 | 486 if (src->in_file) { |
487 | |
488 if (sendfile) { | |
489 dst->in_file = 1; | |
490 dst->file = src->file; | |
491 dst->file_pos = src->file_pos; | |
492 dst->file_last = src->file_pos + size; | |
493 | |
494 } else { | |
495 dst->in_file = 0; | |
496 } | |
497 | |
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498 src->file_pos += size; |
452 | 499 |
500 } else { | |
501 dst->in_file = 0; | |
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502 } |
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503 |
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504 if (src->pos == src->last) { |
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505 dst->flush = src->flush; |
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506 dst->last_buf = src->last_buf; |
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507 dst->last_in_chain = src->last_in_chain; |
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508 } |
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509 |
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510 } else { |
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511 |
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512 #if (NGX_HAVE_ALIGNED_DIRECTIO) |
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513 |
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514 if (ctx->unaligned) { |
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515 if (ngx_directio_off(src->file->fd) == NGX_FILE_ERROR) { |
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516 ngx_log_error(NGX_LOG_ALERT, ctx->pool->log, ngx_errno, |
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517 ngx_directio_off_n " \"%s\" failed", |
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518 src->file->name.data); |
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519 } |
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520 } |
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521 |
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522 #endif |
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523 |
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524 #if (NGX_HAVE_FILE_AIO) |
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525 |
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526 if (ctx->aio_handler) { |
3052
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527 n = ngx_file_aio_read(src->file, dst->pos, (size_t) size, |
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528 src->file_pos, ctx->pool); |
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529 if (n == NGX_AGAIN) { |
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530 ctx->aio_handler(ctx, src->file); |
3052
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531 return NGX_AGAIN; |
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532 } |
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533 |
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534 } else { |
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535 n = ngx_read_file(src->file, dst->pos, (size_t) size, |
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536 src->file_pos); |
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537 } |
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538 #else |
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539 |
473 | 540 n = ngx_read_file(src->file, dst->pos, (size_t) size, src->file_pos); |
160
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541 |
3052
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542 #endif |
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543 |
2248
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544 #if (NGX_HAVE_ALIGNED_DIRECTIO) |
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545 |
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546 if (ctx->unaligned) { |
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547 ngx_err_t err; |
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548 |
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549 err = ngx_errno; |
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550 |
3164
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uniform ngx_directio_on/off() interface with other file functions
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3147
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551 if (ngx_directio_on(src->file->fd) == NGX_FILE_ERROR) { |
2248
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552 ngx_log_error(NGX_LOG_ALERT, ctx->pool->log, ngx_errno, |
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553 ngx_directio_on_n " \"%s\" failed", |
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554 src->file->name.data); |
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555 } |
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|
556 |
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557 ngx_set_errno(err); |
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558 |
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559 ctx->unaligned = 0; |
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560 } |
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561 |
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562 #endif |
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563 |
160
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564 if (n == NGX_ERROR) { |
517 | 565 return (ngx_int_t) n; |
160
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566 } |
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567 |
473 | 568 if (n != size) { |
2231
8564129d49b6
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2230
diff
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|
569 ngx_log_error(NGX_LOG_ALERT, ctx->pool->log, 0, |
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570 ngx_read_file_n " read only %z of %O from \"%s\"", |
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571 n, size, src->file->name.data); |
3147
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572 return NGX_ERROR; |
160
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573 } |
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|
574 |
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575 dst->last += n; |
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576 |
452 | 577 if (sendfile) { |
578 dst->in_file = 1; | |
579 dst->file = src->file; | |
580 dst->file_pos = src->file_pos; | |
455 | 581 dst->file_last = src->file_pos + n; |
452 | 582 |
583 } else { | |
343
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334
diff
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|
584 dst->in_file = 0; |
160
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|
585 } |
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586 |
455 | 587 src->file_pos += n; |
588 | |
1238 | 589 if (src->file_pos == src->file_last) { |
1227
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inherit flush flag, this fixes https proxying
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diff
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|
590 dst->flush = src->flush; |
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diff
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|
591 dst->last_buf = src->last_buf; |
2899
61d5b945730a
fix XSLT filter in SSI subrequests
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parents:
2316
diff
changeset
|
592 dst->last_in_chain = src->last_in_chain; |
160
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|
593 } |
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parents:
diff
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|
594 } |
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parents:
diff
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|
595 |
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|
596 return NGX_OK; |
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|
597 } |
162
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parents:
160
diff
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|
598 |
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|
599 |
499 | 600 ngx_int_t |
601 ngx_chain_writer(void *data, ngx_chain_t *in) | |
162
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|
602 { |
166
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164
diff
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|
603 ngx_chain_writer_ctx_t *ctx = data; |
162
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|
604 |
1962 | 605 off_t size; |
606 ngx_chain_t *cl; | |
607 ngx_connection_t *c; | |
608 | |
609 c = ctx->connection; | |
162
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|
610 |
473 | 611 for (size = 0; in; in = in->next) { |
612 | |
613 #if 1 | |
614 if (ngx_buf_size(in->buf) == 0 && !ngx_buf_special(in->buf)) { | |
615 ngx_debug_point(); | |
616 } | |
617 #endif | |
618 | |
619 size += ngx_buf_size(in->buf); | |
408
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Igor Sysoev <igor@sysoev.ru>
parents:
403
diff
changeset
|
620 |
1962 | 621 ngx_log_debug2(NGX_LOG_DEBUG_CORE, c->log, 0, |
1226 | 622 "chain writer buf fl:%d s:%uO", |
623 in->buf->flush, ngx_buf_size(in->buf)); | |
408
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403
diff
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|
624 |
501 | 625 cl = ngx_alloc_chain_link(ctx->pool); |
626 if (cl == NULL) { | |
461 | 627 return NGX_ERROR; |
628 } | |
501 | 629 |
461 | 630 cl->buf = in->buf; |
631 cl->next = NULL; | |
162
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|
632 *ctx->last = cl; |
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|
633 ctx->last = &cl->next; |
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diff
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|
634 } |
96993d4d5067
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160
diff
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|
635 |
1962 | 636 ngx_log_debug1(NGX_LOG_DEBUG_CORE, c->log, 0, |
461 | 637 "chain writer in: %p", ctx->out); |
291
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257
diff
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|
638 |
473 | 639 for (cl = ctx->out; cl; cl = cl->next) { |
640 | |
641 #if 1 | |
642 if (ngx_buf_size(cl->buf) == 0 && !ngx_buf_special(cl->buf)) { | |
643 ngx_debug_point(); | |
644 } | |
645 | |
646 #endif | |
647 | |
648 size += ngx_buf_size(cl->buf); | |
649 } | |
650 | |
1962 | 651 if (size == 0 && !c->buffered) { |
473 | 652 return NGX_OK; |
653 } | |
654 | |
1962 | 655 ctx->out = c->send_chain(c, ctx->out, ctx->limit); |
162
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diff
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|
656 |
1962 | 657 ngx_log_debug1(NGX_LOG_DEBUG_CORE, c->log, 0, |
461 | 658 "chain writer out: %p", ctx->out); |
291
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diff
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|
659 |
162
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160
diff
changeset
|
660 if (ctx->out == NGX_CHAIN_ERROR) { |
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diff
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|
661 return NGX_ERROR; |
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diff
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|
662 } |
96993d4d5067
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diff
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|
663 |
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diff
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|
664 if (ctx->out == NULL) { |
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160
diff
changeset
|
665 ctx->last = &ctx->out; |
1211 | 666 |
1962 | 667 if (!c->buffered) { |
1215
fb3ff245c96b
an request body might not be passed to backend,
Igor Sysoev <igor@sysoev.ru>
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1211
diff
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|
668 return NGX_OK; |
fb3ff245c96b
an request body might not be passed to backend,
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|
669 } |
162
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|
670 } |
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|
671 |
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diff
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|
672 return NGX_AGAIN; |
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diff
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|
673 } |