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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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406
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21 ngx_output_chain_as_is(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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406
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24 static ngx_int_t ngx_output_chain_align_file_buf(ngx_output_chain_ctx_t *ctx,
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25 off_t bsize);
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26 static ngx_int_t ngx_output_chain_get_buf(ngx_output_chain_ctx_t *ctx,
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27 off_t bsize);
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28 static ngx_int_t ngx_output_chain_copy_buf(ngx_output_chain_ctx_t *ctx);
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0
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29
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30
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48
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31 ngx_int_t
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32 ngx_output_chain(ngx_output_chain_ctx_t *ctx, ngx_chain_t *in)
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0
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33 {
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22
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34 off_t bsize;
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146
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35 ngx_int_t rc, last;
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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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406
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54 && ngx_output_chain_as_is(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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406
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78 * and there are the free output bufs to copy in
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0
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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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406
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105 if (ngx_output_chain_as_is(ctx, ctx->in->buf)) {
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0
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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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406
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121 rc = ngx_output_chain_align_file_buf(ctx, bsize);
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0
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122
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406
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123 if (rc == NGX_ERROR) {
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124 return NGX_ERROR;
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125 }
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0
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126
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406
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127 if (rc != NGX_OK) {
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0
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128
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406
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129 if (ctx->free) {
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0
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130
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406
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131 /* get the free buf */
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0
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132
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406
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133 cl = ctx->free;
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134 ctx->buf = cl->buf;
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135 ctx->free = cl->next;
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0
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136
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406
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137 ngx_free_chain(ctx->pool, cl);
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0
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138
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406
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139 } else if (out || ctx->allocated == ctx->bufs.num) {
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0
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140
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406
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141 break;
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0
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142
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406
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143 } else if (ngx_output_chain_get_buf(ctx, bsize) != NGX_OK) {
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0
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144 return NGX_ERROR;
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145 }
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146 }
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147 }
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148
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406
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149 rc = ngx_output_chain_copy_buf(ctx);
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0
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150
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151 if (rc == NGX_ERROR) {
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152 return rc;
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153 }
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154
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155 if (rc == NGX_AGAIN) {
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156 if (out) {
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157 break;
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158 }
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159
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160 return rc;
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161 }
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162
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163 /* delete the completed buf from the ctx->in chain */
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164
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165 if (ngx_buf_size(ctx->in->buf) == 0) {
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166 ctx->in = ctx->in->next;
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167 }
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168
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50
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169 cl = ngx_alloc_chain_link(ctx->pool);
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170 if (cl == NULL) {
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10
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171 return NGX_ERROR;
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172 }
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50
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173
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10
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174 cl->buf = ctx->buf;
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175 cl->next = NULL;
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0
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176 *last_out = cl;
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177 last_out = &cl->next;
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178 ctx->buf = NULL;
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179 }
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180
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181 if (out == NULL && last != NGX_NONE) {
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58
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182
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183 if (ctx->in) {
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184 return NGX_AGAIN;
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185 }
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186
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0
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187 return last;
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188 }
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189
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190 last = ctx->output_filter(ctx->filter_ctx, out);
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191
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118
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192 if (last == NGX_ERROR || last == NGX_DONE) {
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193 return last;
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194 }
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195
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0
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196 ngx_chain_update_chains(&ctx->free, &ctx->busy, &out, ctx->tag);
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197 last_out = &out;
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198 }
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199 }
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200
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201
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16
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202 static ngx_inline ngx_int_t
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406
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203 ngx_output_chain_as_is(ngx_output_chain_ctx_t *ctx, ngx_buf_t *buf)
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0
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204 {
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18
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205 ngx_uint_t sendfile;
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206
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0
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207 if (ngx_buf_special(buf)) {
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406
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208 return 1;
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209 }
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210
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211 if (buf->in_file && buf->file->directio) {
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0
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212 return 0;
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213 }
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214
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18
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215 sendfile = ctx->sendfile;
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216
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217 #if (NGX_SENDFILE_LIMIT)
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218
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219 if (buf->in_file && buf->file_pos >= NGX_SENDFILE_LIMIT) {
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220 sendfile = 0;
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221 }
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222
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223 #endif
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224
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225 if (!sendfile) {
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4
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226
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0
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227 if (!ngx_buf_in_memory(buf)) {
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406
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228 return 0;
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0
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229 }
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230
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231 buf->in_file = 0;
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232 }
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233
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234 if (ctx->need_in_memory && !ngx_buf_in_memory(buf)) {
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406
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235 return 0;
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0
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236 }
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237
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238 if (ctx->need_in_temp && (buf->memory || buf->mmap)) {
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406
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239 return 0;
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0
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240 }
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241
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406
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242 return 1;
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0
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243 }
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244
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245
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48
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246 static ngx_int_t
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247 ngx_output_chain_add_copy(ngx_pool_t *pool, ngx_chain_t **chain,
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248 ngx_chain_t *in)
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18
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249 {
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250 ngx_chain_t *cl, **ll;
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251 #if (NGX_SENDFILE_LIMIT)
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252 ngx_buf_t *b, *buf;
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253 #endif
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254
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255 ll = chain;
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256
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257 for (cl = *chain; cl; cl = cl->next) {
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258 ll = &cl->next;
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259 }
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260
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261 while (in) {
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262
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50
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263 cl = ngx_alloc_chain_link(pool);
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264 if (cl == NULL) {
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18
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265 return NGX_ERROR;
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266 }
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267
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268 #if (NGX_SENDFILE_LIMIT)
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269
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270 buf = in->buf;
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271
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272 if (buf->in_file
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273 && buf->file_pos < NGX_SENDFILE_LIMIT
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274 && buf->file_last > NGX_SENDFILE_LIMIT)
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275 {
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406
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276 /* split a file buf on two bufs by the sendfile limit */
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277
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50
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278 b = ngx_calloc_buf(pool);
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279 if (b == NULL) {
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18
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280 return NGX_ERROR;
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281 }
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282
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283 ngx_memcpy(b, buf, sizeof(ngx_buf_t));
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284
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285 if (ngx_buf_in_memory(buf)) {
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286 buf->pos += (ssize_t) (NGX_SENDFILE_LIMIT - buf->file_pos);
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287 b->last = buf->pos;
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288 }
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289
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290 buf->file_pos = NGX_SENDFILE_LIMIT;
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291 b->file_last = NGX_SENDFILE_LIMIT;
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292
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293 cl->buf = b;
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294
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295 } else {
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296 cl->buf = buf;
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297 in = in->next;
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298 }
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299
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300 #else
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301 cl->buf = in->buf;
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302 in = in->next;
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303
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304 #endif
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305
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306 *ll = cl;
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307 ll = &cl->next;
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308 }
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309
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310 *ll = NULL;
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311
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312 return NGX_OK;
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313 }
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314
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315
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48
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316 static ngx_int_t
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406
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317 ngx_output_chain_align_file_buf(ngx_output_chain_ctx_t *ctx, off_t bsize)
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318 {
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319 size_t size;
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320 ngx_buf_t *in;
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321
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322 in = ctx->in->buf;
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323
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324 if (in->file == NULL || !in->file->directio) {
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325 return NGX_DECLINED;
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326 }
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327
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328 ctx->directio = 1;
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329
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330 size = (size_t) (in->file_pos - (in->file_pos & ~511));
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331
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332 if (size == 0) {
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333
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334 if (bsize >= ctx->bufs.size) {
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335 return NGX_DECLINED;
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336 }
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337
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338 size = (size_t) bsize;
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339
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340 } else {
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341 size = 512 - size;
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342
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343 if (size > bsize) {
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344 size = (size_t) bsize;
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345 }
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346 }
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347
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348 ctx->buf = ngx_create_temp_buf(ctx->pool, size);
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349 if (ctx->buf == NULL) {
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350 return NGX_ERROR;
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351 }
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352
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353 /*
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354 * we do not set ctx->buf->tag, because we do not want
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355 * to reuse the buf via ctx->free list
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356 */
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357
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358 return NGX_OK;
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359 }
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360
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361
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362 static ngx_int_t
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363 ngx_output_chain_get_buf(ngx_output_chain_ctx_t *ctx, off_t bsize)
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0
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364 {
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406
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365 size_t size;
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366 ngx_buf_t *b, *in;
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367 ngx_uint_t recycled;
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368
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369 in = ctx->in->buf;
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370 size = ctx->bufs.size;
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371 recycled = 1;
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372
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373 if (in->last_in_chain) {
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374
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375 if (bsize < (off_t) size) {
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376
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377 /*
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378 * allocate a small temp buf for a small last buf
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379 * or its small last part
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380 */
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381
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382 size = (size_t) bsize;
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383 recycled = 0;
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384
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385 } else if (!ctx->directio
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386 && ctx->bufs.num == 1
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387 && (bsize < (off_t) (size + size / 4)))
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388 {
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389 /*
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390 * allocate a temp buf that equals to a last buf,
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391 * if there is no directio, the last buf size is lesser
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392 * than 1.25 of bufs.size and the temp buf is single
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393 */
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394
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395 size = (size_t) bsize;
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396 recycled = 0;
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397 }
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398 }
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399
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400 b = ngx_calloc_buf(ctx->pool);
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401 if (b == NULL) {
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402 return NGX_ERROR;
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403 }
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404
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405 if (ctx->directio) {
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406
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407 /*
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408 * allocate block aligned to a disk sector size to enable
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409 * userland buffer direct usage conjunctly with directio
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410 */
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411
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412 b->start = ngx_pmemalign(ctx->pool, size, 512);
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413 if (b->start == NULL) {
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414 return NGX_ERROR;
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415 }
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416
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417 } else {
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418 b->start = ngx_palloc(ctx->pool, size);
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419 if (b->start == NULL) {
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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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424 b->pos = b->start;
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425 b->last = b->start;
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426 b->end = b->last + size;
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427 b->temporary = 1;
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428 b->tag = ctx->tag;
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429 b->recycled = recycled;
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430
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431 ctx->buf = b;
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432 ctx->allocated++;
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433
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434 return NGX_OK;
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435 }
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436
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437
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438 static ngx_int_t
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439 ngx_output_chain_copy_buf(ngx_output_chain_ctx_t *ctx)
|
|
|
440 {
|
|
|
441 off_t size;
|
|
|
442 ssize_t n;
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|
|
443 ngx_buf_t *src, *dst;
|
|
|
444 ngx_uint_t sendfile;
|
|
|
445
|
|
|
446 src = ctx->in->buf;
|
|
|
447 dst = ctx->buf;
|
|
0
|
448
|
|
|
449 size = ngx_buf_size(src);
|
|
|
450
|
|
22
|
451 if (size > dst->end - dst->pos) {
|
|
0
|
452 size = dst->end - dst->pos;
|
|
|
453 }
|
|
|
454
|
|
406
|
455 sendfile = ctx->sendfile & !ctx->directio;
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|
|
456
|
|
18
|
457 #if (NGX_SENDFILE_LIMIT)
|
|
|
458
|
|
|
459 if (src->in_file && src->file_pos >= NGX_SENDFILE_LIMIT) {
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|
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460 sendfile = 0;
|
|
|
461 }
|
|
|
462
|
|
|
463 #endif
|
|
|
464
|
|
0
|
465 if (ngx_buf_in_memory(src)) {
|
|
22
|
466 ngx_memcpy(dst->pos, src->pos, (size_t) size);
|
|
|
467 src->pos += (size_t) size;
|
|
|
468 dst->last += (size_t) size;
|
|
0
|
469
|
|
4
|
470 if (src->in_file) {
|
|
|
471
|
|
|
472 if (sendfile) {
|
|
|
473 dst->in_file = 1;
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|
|
474 dst->file = src->file;
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|
|
475 dst->file_pos = src->file_pos;
|
|
|
476 dst->file_last = src->file_pos + size;
|
|
|
477
|
|
|
478 } else {
|
|
|
479 dst->in_file = 0;
|
|
|
480 }
|
|
|
481
|
|
0
|
482 src->file_pos += size;
|
|
2
|
483
|
|
|
484 } else {
|
|
|
485 dst->in_file = 0;
|
|
0
|
486 }
|
|
|
487
|
|
306
|
488 if (src->pos == src->last) {
|
|
|
489 dst->flush = src->flush;
|
|
|
490 dst->last_buf = src->last_buf;
|
|
0
|
491 }
|
|
|
492
|
|
|
493 } else {
|
|
22
|
494 n = ngx_read_file(src->file, dst->pos, (size_t) size, src->file_pos);
|
|
0
|
495
|
|
|
496 if (n == NGX_ERROR) {
|
|
66
|
497 return (ngx_int_t) n;
|
|
0
|
498 }
|
|
|
499
|
|
|
500 #if (NGX_FILE_AIO_READ)
|
|
|
501 if (n == NGX_AGAIN) {
|
|
66
|
502 return (ngx_int_t) n;
|
|
0
|
503 }
|
|
|
504 #endif
|
|
|
505
|
|
22
|
506 if (n != size) {
|
|
406
|
507 ngx_log_error(NGX_LOG_ALERT, ctx->pool->log, 0,
|
|
398
|
508 ngx_read_file_n " read only %z of %O from file",
|
|
0
|
509 n, size);
|
|
|
510 if (n == 0) {
|
|
|
511 return NGX_ERROR;
|
|
|
512 }
|
|
|
513 }
|
|
|
514
|
|
|
515 dst->last += n;
|
|
|
516
|
|
2
|
517 if (sendfile) {
|
|
|
518 dst->in_file = 1;
|
|
|
519 dst->file = src->file;
|
|
|
520 dst->file_pos = src->file_pos;
|
|
4
|
521 dst->file_last = src->file_pos + n;
|
|
2
|
522
|
|
|
523 } else {
|
|
0
|
524 dst->in_file = 0;
|
|
|
525 }
|
|
|
526
|
|
4
|
527 src->file_pos += n;
|
|
|
528
|
|
308
|
529 if (src->file_pos == src->file_last) {
|
|
306
|
530 dst->flush = src->flush;
|
|
|
531 dst->last_buf = src->last_buf;
|
|
0
|
532 }
|
|
|
533 }
|
|
|
534
|
|
|
535 return NGX_OK;
|
|
|
536 }
|
|
|
537
|
|
|
538
|
|
48
|
539 ngx_int_t
|
|
|
540 ngx_chain_writer(void *data, ngx_chain_t *in)
|
|
0
|
541 {
|
|
|
542 ngx_chain_writer_ctx_t *ctx = data;
|
|
|
543
|
|
372
|
544 off_t size;
|
|
|
545 ngx_chain_t *cl;
|
|
|
546 ngx_connection_t *c;
|
|
|
547
|
|
|
548 c = ctx->connection;
|
|
0
|
549
|
|
22
|
550 for (size = 0; in; in = in->next) {
|
|
|
551
|
|
|
552 #if 1
|
|
|
553 if (ngx_buf_size(in->buf) == 0 && !ngx_buf_special(in->buf)) {
|
|
|
554 ngx_debug_point();
|
|
|
555 }
|
|
|
556 #endif
|
|
|
557
|
|
|
558 size += ngx_buf_size(in->buf);
|
|
0
|
559
|
|
372
|
560 ngx_log_debug2(NGX_LOG_DEBUG_CORE, c->log, 0,
|
|
306
|
561 "chain writer buf fl:%d s:%uO",
|
|
|
562 in->buf->flush, ngx_buf_size(in->buf));
|
|
0
|
563
|
|
50
|
564 cl = ngx_alloc_chain_link(ctx->pool);
|
|
|
565 if (cl == NULL) {
|
|
10
|
566 return NGX_ERROR;
|
|
|
567 }
|
|
50
|
568
|
|
10
|
569 cl->buf = in->buf;
|
|
|
570 cl->next = NULL;
|
|
0
|
571 *ctx->last = cl;
|
|
|
572 ctx->last = &cl->next;
|
|
|
573 }
|
|
|
574
|
|
372
|
575 ngx_log_debug1(NGX_LOG_DEBUG_CORE, c->log, 0,
|
|
10
|
576 "chain writer in: %p", ctx->out);
|
|
0
|
577
|
|
22
|
578 for (cl = ctx->out; cl; cl = cl->next) {
|
|
|
579
|
|
|
580 #if 1
|
|
|
581 if (ngx_buf_size(cl->buf) == 0 && !ngx_buf_special(cl->buf)) {
|
|
|
582 ngx_debug_point();
|
|
|
583 }
|
|
|
584
|
|
|
585 #endif
|
|
|
586
|
|
|
587 size += ngx_buf_size(cl->buf);
|
|
|
588 }
|
|
|
589
|
|
372
|
590 if (size == 0 && !c->buffered) {
|
|
22
|
591 return NGX_OK;
|
|
|
592 }
|
|
|
593
|
|
372
|
594 ctx->out = c->send_chain(c, ctx->out, ctx->limit);
|
|
0
|
595
|
|
372
|
596 ngx_log_debug1(NGX_LOG_DEBUG_CORE, c->log, 0,
|
|
10
|
597 "chain writer out: %p", ctx->out);
|
|
0
|
598
|
|
|
599 if (ctx->out == NGX_CHAIN_ERROR) {
|
|
|
600 return NGX_ERROR;
|
|
|
601 }
|
|
|
602
|
|
|
603 if (ctx->out == NULL) {
|
|
|
604 ctx->last = &ctx->out;
|
|
302
|
605
|
|
372
|
606 if (!c->buffered) {
|
|
304
|
607 return NGX_OK;
|
|
|
608 }
|
|
0
|
609 }
|
|
|
610
|
|
|
611 return NGX_AGAIN;
|
|
|
612 }
|
