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0
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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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18
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12 #if 0
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13 #define NGX_SENDFILE_LIMIT 4096
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14 #endif
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15
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16
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17 #define NGX_NONE 1
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0
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18
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19
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16
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20 static ngx_inline ngx_int_t
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0
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21 ngx_output_chain_need_to_copy(ngx_output_chain_ctx_t *ctx, ngx_buf_t *buf);
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18
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22 static ngx_int_t ngx_output_chain_add_copy(ngx_pool_t *pool,
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48
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23 ngx_chain_t **chain, ngx_chain_t *in);
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0
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24 static ngx_int_t ngx_output_chain_copy_buf(ngx_buf_t *dst, ngx_buf_t *src,
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48
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25 ngx_uint_t sendfile);
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0
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26
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27
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48
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28 ngx_int_t
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29 ngx_output_chain(ngx_output_chain_ctx_t *ctx, ngx_chain_t *in)
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0
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30 {
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22
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31 off_t bsize;
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32 size_t size;
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146
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33 ngx_int_t rc, last;
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34 ngx_uint_t recycled;
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390
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35 ngx_buf_t *b;
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0
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36 ngx_chain_t *cl, *out, **last_out;
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37
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4
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38 if (ctx->in == NULL && ctx->busy == NULL) {
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0
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39
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18
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40 /*
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41 * the short path for the case when the ctx->in and ctx->busy chains
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42 * are empty, the incoming chain is empty too or has the single buf
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43 * that does not require the copy
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44 */
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0
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45
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46 if (in == NULL) {
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47 return ctx->output_filter(ctx->filter_ctx, in);
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48 }
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49
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50 if (in->next == NULL
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18
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51 #if (NGX_SENDFILE_LIMIT)
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52 && !(in->buf->in_file && in->buf->file_last > NGX_SENDFILE_LIMIT)
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53 #endif
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58
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54 && !ngx_output_chain_need_to_copy(ctx, in->buf))
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0
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55 {
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56 return ctx->output_filter(ctx->filter_ctx, in);
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57 }
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58 }
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59
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60 /* add the incoming buf to the chain ctx->in */
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61
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62 if (in) {
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18
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63 if (ngx_output_chain_add_copy(ctx->pool, &ctx->in, in) == NGX_ERROR) {
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0
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64 return NGX_ERROR;
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65 }
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66 }
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67
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68 out = NULL;
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69 last_out = &out;
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48
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70 last = NGX_NONE;
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0
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71
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72 for ( ;; ) {
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73
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74 while (ctx->in) {
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75
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76 /*
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77 * cycle while there are the ctx->in bufs
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78 * or there are the free output bufs to copy in
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79 */
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80
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81 bsize = ngx_buf_size(ctx->in->buf);
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82
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83 if (bsize == 0 && !ngx_buf_special(ctx->in->buf)) {
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84
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85 ngx_log_error(NGX_LOG_ALERT, ctx->pool->log, 0,
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32
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86 "zero size buf in output "
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87 "t:%d r:%d f:%d %p %p-%p %p %O-%O",
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88 ctx->in->buf->temporary,
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89 ctx->in->buf->recycled,
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90 ctx->in->buf->in_file,
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91 ctx->in->buf->start,
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92 ctx->in->buf->pos,
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93 ctx->in->buf->last,
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94 ctx->in->buf->file,
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95 ctx->in->buf->file_pos,
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96 ctx->in->buf->file_last);
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0
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97
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22
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98 ngx_debug_point();
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99
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0
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100 ctx->in = ctx->in->next;
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101
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102 continue;
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103 }
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104
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105 if (!ngx_output_chain_need_to_copy(ctx, ctx->in->buf)) {
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106
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107 /* move the chain link to the output chain */
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108
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109 cl = ctx->in;
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110 ctx->in = cl->next;
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111
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112 *last_out = cl;
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113 last_out = &cl->next;
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114 cl->next = NULL;
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115
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116 continue;
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117 }
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118
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119 if (ctx->buf == NULL) {
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120
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121 /* get the free buf */
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122
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123 if (ctx->free) {
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56
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124 cl = ctx->free;
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125 ctx->buf = cl->buf;
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126 ctx->free = cl->next;
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127 ngx_free_chain(ctx->pool, cl);
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0
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128
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129 } else if (out || ctx->allocated == ctx->bufs.num) {
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130
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131 break;
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132
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133 } else {
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134
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135 size = ctx->bufs.size;
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146
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136 recycled = 1;
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0
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137
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58
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138 if (ctx->in->buf->last_in_chain) {
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0
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139
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22
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140 if (bsize < (off_t) ctx->bufs.size) {
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0
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141
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142 /*
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143 * allocate small temp buf for the small last buf
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144 * or its small last part
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145 */
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146
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22
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147 size = (size_t) bsize;
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146
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148 recycled = 0;
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0
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149
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150 } else if (ctx->bufs.num == 1
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22
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151 && (bsize < (off_t) (ctx->bufs.size
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152 + (ctx->bufs.size >> 2))))
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0
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153 {
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154 /*
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155 * allocate a temp buf that equals
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156 * to the last buf if the last buf size is lesser
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157 * than 1.25 of bufs.size and a temp buf is single
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158 */
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159
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22
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160 size = (size_t) bsize;
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146
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161 recycled = 0;
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0
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162 }
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163 }
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164
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390
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165 b = ngx_calloc_buf(ctx->pool);
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166 if (b == NULL) {
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0
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167 return NGX_ERROR;
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168 }
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169
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390
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170 /*
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171 * allocate block aligned to a disk sector size
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172 * to enable O_DIRECT
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173 */
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174
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175 b->start = ngx_pmemalign(ctx->pool, size, 512);
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176 if (b->start == NULL) {
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177 return NGX_ERROR;
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178 }
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179
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180 b->pos = b->start;
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181 b->last = b->start;
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182 b->end = b->last + size;
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183 b->temporary = 1;
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184 b->tag = ctx->tag;
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185 b->recycled = recycled;
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186
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187 ctx->buf = b;
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0
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188 ctx->allocated++;
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189 }
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190 }
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191
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192 rc = ngx_output_chain_copy_buf(ctx->buf, ctx->in->buf,
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193 ctx->sendfile);
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194
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195 if (rc == NGX_ERROR) {
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196 return rc;
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197 }
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198
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199 if (rc == NGX_AGAIN) {
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200 if (out) {
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201 break;
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202 }
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203
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204 return rc;
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205 }
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206
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207 /* delete the completed buf from the ctx->in chain */
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208
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209 if (ngx_buf_size(ctx->in->buf) == 0) {
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210 ctx->in = ctx->in->next;
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211 }
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212
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50
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213 cl = ngx_alloc_chain_link(ctx->pool);
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214 if (cl == NULL) {
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10
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215 return NGX_ERROR;
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216 }
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50
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217
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10
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218 cl->buf = ctx->buf;
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219 cl->next = NULL;
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0
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220 *last_out = cl;
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221 last_out = &cl->next;
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222 ctx->buf = NULL;
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223 }
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224
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225 if (out == NULL && last != NGX_NONE) {
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58
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226
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227 if (ctx->in) {
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228 return NGX_AGAIN;
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229 }
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230
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0
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231 return last;
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232 }
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233
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234 last = ctx->output_filter(ctx->filter_ctx, out);
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235
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118
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236 if (last == NGX_ERROR || last == NGX_DONE) {
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237 return last;
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238 }
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239
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0
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240 ngx_chain_update_chains(&ctx->free, &ctx->busy, &out, ctx->tag);
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241 last_out = &out;
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242 }
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243 }
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244
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245
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16
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246 static ngx_inline ngx_int_t
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48
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247 ngx_output_chain_need_to_copy(ngx_output_chain_ctx_t *ctx, ngx_buf_t *buf)
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0
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248 {
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18
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249 ngx_uint_t sendfile;
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250
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0
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251 if (ngx_buf_special(buf)) {
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252 return 0;
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253 }
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254
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18
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255 sendfile = ctx->sendfile;
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256
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257 #if (NGX_SENDFILE_LIMIT)
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258
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259 if (buf->in_file && buf->file_pos >= NGX_SENDFILE_LIMIT) {
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260 sendfile = 0;
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261 }
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262
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263 #endif
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264
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265 if (!sendfile) {
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4
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266
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0
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267 if (!ngx_buf_in_memory(buf)) {
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268 return 1;
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269 }
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270
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271 buf->in_file = 0;
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272 }
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273
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274 if (ctx->need_in_memory && !ngx_buf_in_memory(buf)) {
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275 return 1;
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276 }
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277
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278 if (ctx->need_in_temp && (buf->memory || buf->mmap)) {
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279 return 1;
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280 }
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281
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282 return 0;
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283 }
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284
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285
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48
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286 static ngx_int_t
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287 ngx_output_chain_add_copy(ngx_pool_t *pool, ngx_chain_t **chain,
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288 ngx_chain_t *in)
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18
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289 {
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290 ngx_chain_t *cl, **ll;
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291 #if (NGX_SENDFILE_LIMIT)
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292 ngx_buf_t *b, *buf;
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293 #endif
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294
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295 ll = chain;
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296
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297 for (cl = *chain; cl; cl = cl->next) {
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298 ll = &cl->next;
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299 }
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300
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301 while (in) {
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302
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50
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303 cl = ngx_alloc_chain_link(pool);
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304 if (cl == NULL) {
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18
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305 return NGX_ERROR;
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306 }
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307
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308 #if (NGX_SENDFILE_LIMIT)
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309
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310 buf = in->buf;
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311
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312 if (buf->in_file
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313 && buf->file_pos < NGX_SENDFILE_LIMIT
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314 && buf->file_last > NGX_SENDFILE_LIMIT)
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315 {
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50
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316 b = ngx_calloc_buf(pool);
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317 if (b == NULL) {
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18
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318 return NGX_ERROR;
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319 }
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320
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321 ngx_memcpy(b, buf, sizeof(ngx_buf_t));
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322
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323 if (ngx_buf_in_memory(buf)) {
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324 buf->pos += (ssize_t) (NGX_SENDFILE_LIMIT - buf->file_pos);
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325 b->last = buf->pos;
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326 }
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327
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328 buf->file_pos = NGX_SENDFILE_LIMIT;
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329 b->file_last = NGX_SENDFILE_LIMIT;
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330
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331 cl->buf = b;
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332
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333 } else {
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334 cl->buf = buf;
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335 in = in->next;
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336 }
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337
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338 #else
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339 cl->buf = in->buf;
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340 in = in->next;
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341
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342 #endif
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343
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344 *ll = cl;
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345 ll = &cl->next;
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346 }
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347
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348 *ll = NULL;
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349
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350 return NGX_OK;
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351 }
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352
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353
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48
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354 static ngx_int_t
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355 ngx_output_chain_copy_buf(ngx_buf_t *dst, ngx_buf_t *src, ngx_uint_t sendfile)
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0
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356 {
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22
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357 off_t size;
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0
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358 ssize_t n;
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359
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360 size = ngx_buf_size(src);
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361
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22
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362 if (size > dst->end - dst->pos) {
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0
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363 size = dst->end - dst->pos;
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364 }
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365
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18
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366 #if (NGX_SENDFILE_LIMIT)
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367
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368 if (src->in_file && src->file_pos >= NGX_SENDFILE_LIMIT) {
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369 sendfile = 0;
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370 }
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371
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372 #endif
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373
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0
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374 if (ngx_buf_in_memory(src)) {
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22
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375 ngx_memcpy(dst->pos, src->pos, (size_t) size);
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376 src->pos += (size_t) size;
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377 dst->last += (size_t) size;
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0
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378
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4
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379 if (src->in_file) {
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380
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381 if (sendfile) {
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382 dst->in_file = 1;
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383 dst->file = src->file;
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384 dst->file_pos = src->file_pos;
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385 dst->file_last = src->file_pos + size;
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386
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387 } else {
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388 dst->in_file = 0;
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389 }
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390
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0
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391 src->file_pos += size;
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2
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392
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393 } else {
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394 dst->in_file = 0;
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0
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395 }
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396
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306
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397 if (src->pos == src->last) {
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398 dst->flush = src->flush;
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399 dst->last_buf = src->last_buf;
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0
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400 }
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401
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402 } else {
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22
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403 n = ngx_read_file(src->file, dst->pos, (size_t) size, src->file_pos);
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0
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404
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405 if (n == NGX_ERROR) {
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66
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406 return (ngx_int_t) n;
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0
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407 }
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408
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|
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409 #if (NGX_FILE_AIO_READ)
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410 if (n == NGX_AGAIN) {
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66
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411 return (ngx_int_t) n;
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0
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412 }
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413 #endif
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414
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22
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415 if (n != size) {
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0
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416 ngx_log_error(NGX_LOG_ALERT, src->file->log, 0,
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398
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417 ngx_read_file_n " read only %z of %O from file",
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0
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418 n, size);
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419 if (n == 0) {
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420 return NGX_ERROR;
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421 }
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422 }
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423
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|
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424 dst->last += n;
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425
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2
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426 if (sendfile) {
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427 dst->in_file = 1;
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428 dst->file = src->file;
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429 dst->file_pos = src->file_pos;
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4
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430 dst->file_last = src->file_pos + n;
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2
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431
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|
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432 } else {
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0
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433 dst->in_file = 0;
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434 }
|
|
|
435
|
|
4
|
436 src->file_pos += n;
|
|
|
437
|
|
308
|
438 if (src->file_pos == src->file_last) {
|
|
306
|
439 dst->flush = src->flush;
|
|
|
440 dst->last_buf = src->last_buf;
|
|
0
|
441 }
|
|
|
442 }
|
|
|
443
|
|
|
444 return NGX_OK;
|
|
|
445 }
|
|
|
446
|
|
|
447
|
|
48
|
448 ngx_int_t
|
|
|
449 ngx_chain_writer(void *data, ngx_chain_t *in)
|
|
0
|
450 {
|
|
|
451 ngx_chain_writer_ctx_t *ctx = data;
|
|
|
452
|
|
372
|
453 off_t size;
|
|
|
454 ngx_chain_t *cl;
|
|
|
455 ngx_connection_t *c;
|
|
|
456
|
|
|
457 c = ctx->connection;
|
|
0
|
458
|
|
22
|
459 for (size = 0; in; in = in->next) {
|
|
|
460
|
|
|
461 #if 1
|
|
|
462 if (ngx_buf_size(in->buf) == 0 && !ngx_buf_special(in->buf)) {
|
|
|
463 ngx_debug_point();
|
|
|
464 }
|
|
|
465 #endif
|
|
|
466
|
|
|
467 size += ngx_buf_size(in->buf);
|
|
0
|
468
|
|
372
|
469 ngx_log_debug2(NGX_LOG_DEBUG_CORE, c->log, 0,
|
|
306
|
470 "chain writer buf fl:%d s:%uO",
|
|
|
471 in->buf->flush, ngx_buf_size(in->buf));
|
|
0
|
472
|
|
50
|
473 cl = ngx_alloc_chain_link(ctx->pool);
|
|
|
474 if (cl == NULL) {
|
|
10
|
475 return NGX_ERROR;
|
|
|
476 }
|
|
50
|
477
|
|
10
|
478 cl->buf = in->buf;
|
|
|
479 cl->next = NULL;
|
|
0
|
480 *ctx->last = cl;
|
|
|
481 ctx->last = &cl->next;
|
|
|
482 }
|
|
|
483
|
|
372
|
484 ngx_log_debug1(NGX_LOG_DEBUG_CORE, c->log, 0,
|
|
10
|
485 "chain writer in: %p", ctx->out);
|
|
0
|
486
|
|
22
|
487 for (cl = ctx->out; cl; cl = cl->next) {
|
|
|
488
|
|
|
489 #if 1
|
|
|
490 if (ngx_buf_size(cl->buf) == 0 && !ngx_buf_special(cl->buf)) {
|
|
|
491 ngx_debug_point();
|
|
|
492 }
|
|
|
493
|
|
|
494 #endif
|
|
|
495
|
|
|
496 size += ngx_buf_size(cl->buf);
|
|
|
497 }
|
|
|
498
|
|
372
|
499 if (size == 0 && !c->buffered) {
|
|
22
|
500 return NGX_OK;
|
|
|
501 }
|
|
|
502
|
|
372
|
503 ctx->out = c->send_chain(c, ctx->out, ctx->limit);
|
|
0
|
504
|
|
372
|
505 ngx_log_debug1(NGX_LOG_DEBUG_CORE, c->log, 0,
|
|
10
|
506 "chain writer out: %p", ctx->out);
|
|
0
|
507
|
|
|
508 if (ctx->out == NGX_CHAIN_ERROR) {
|
|
|
509 return NGX_ERROR;
|
|
|
510 }
|
|
|
511
|
|
|
512 if (ctx->out == NULL) {
|
|
|
513 ctx->last = &ctx->out;
|
|
302
|
514
|
|
372
|
515 if (!c->buffered) {
|
|
304
|
516 return NGX_OK;
|
|
|
517 }
|
|
0
|
518 }
|
|
|
519
|
|
|
520 return NGX_AGAIN;
|
|
|
521 }
|
