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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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420
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16 /*
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17 * When DIRECTIO is enabled FreeBSD, Solaris, and MacOSX read directly
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18 * to an application memory from a device if parameters are aligned
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19 * to device sector boundary(512 bytes). They fallback to usual read
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20 * operation if the parameters are not aligned.
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21 * Linux allows DIRECTIO only if the parameters are aligned to a filesystem
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22 * sector boundary, otherwise it returns EINVAL. The sector size is
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23 * usually 512 bytes, however, on XFS it may be 4096 bytes.
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24 */
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25 #define NGX_DIRECTIO_BLOCK 4096
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26
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18
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27
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28 #define NGX_NONE 1
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0
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29
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30
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16
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31 static ngx_inline ngx_int_t
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406
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32 ngx_output_chain_as_is(ngx_output_chain_ctx_t *ctx, ngx_buf_t *buf);
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18
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33 static ngx_int_t ngx_output_chain_add_copy(ngx_pool_t *pool,
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48
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34 ngx_chain_t **chain, ngx_chain_t *in);
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406
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35 static ngx_int_t ngx_output_chain_align_file_buf(ngx_output_chain_ctx_t *ctx,
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36 off_t bsize);
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37 static ngx_int_t ngx_output_chain_get_buf(ngx_output_chain_ctx_t *ctx,
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38 off_t bsize);
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39 static ngx_int_t ngx_output_chain_copy_buf(ngx_output_chain_ctx_t *ctx);
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0
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40
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41
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48
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42 ngx_int_t
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43 ngx_output_chain(ngx_output_chain_ctx_t *ctx, ngx_chain_t *in)
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0
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44 {
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22
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45 off_t bsize;
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146
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46 ngx_int_t rc, last;
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0
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47 ngx_chain_t *cl, *out, **last_out;
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48
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4
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49 if (ctx->in == NULL && ctx->busy == NULL) {
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0
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50
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18
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51 /*
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52 * the short path for the case when the ctx->in and ctx->busy chains
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53 * are empty, the incoming chain is empty too or has the single buf
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54 * that does not require the copy
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55 */
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0
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56
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57 if (in == NULL) {
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58 return ctx->output_filter(ctx->filter_ctx, in);
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59 }
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60
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61 if (in->next == NULL
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18
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62 #if (NGX_SENDFILE_LIMIT)
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63 && !(in->buf->in_file && in->buf->file_last > NGX_SENDFILE_LIMIT)
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64 #endif
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406
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65 && ngx_output_chain_as_is(ctx, in->buf))
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0
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66 {
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67 return ctx->output_filter(ctx->filter_ctx, in);
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68 }
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69 }
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70
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71 /* add the incoming buf to the chain ctx->in */
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72
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73 if (in) {
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18
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74 if (ngx_output_chain_add_copy(ctx->pool, &ctx->in, in) == NGX_ERROR) {
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0
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75 return NGX_ERROR;
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76 }
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77 }
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78
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79 out = NULL;
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80 last_out = &out;
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48
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81 last = NGX_NONE;
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0
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82
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83 for ( ;; ) {
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84
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85 while (ctx->in) {
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86
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87 /*
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88 * cycle while there are the ctx->in bufs
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406
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89 * and there are the free output bufs to copy in
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0
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90 */
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91
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92 bsize = ngx_buf_size(ctx->in->buf);
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93
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94 if (bsize == 0 && !ngx_buf_special(ctx->in->buf)) {
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95
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96 ngx_log_error(NGX_LOG_ALERT, ctx->pool->log, 0,
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32
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97 "zero size buf in output "
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98 "t:%d r:%d f:%d %p %p-%p %p %O-%O",
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99 ctx->in->buf->temporary,
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100 ctx->in->buf->recycled,
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101 ctx->in->buf->in_file,
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102 ctx->in->buf->start,
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103 ctx->in->buf->pos,
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104 ctx->in->buf->last,
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105 ctx->in->buf->file,
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106 ctx->in->buf->file_pos,
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107 ctx->in->buf->file_last);
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0
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108
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22
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109 ngx_debug_point();
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110
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0
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111 ctx->in = ctx->in->next;
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112
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113 continue;
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114 }
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115
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406
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116 if (ngx_output_chain_as_is(ctx, ctx->in->buf)) {
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0
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117
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118 /* move the chain link to the output chain */
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119
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120 cl = ctx->in;
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121 ctx->in = cl->next;
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122
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123 *last_out = cl;
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124 last_out = &cl->next;
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125 cl->next = NULL;
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126
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127 continue;
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128 }
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129
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130 if (ctx->buf == NULL) {
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131
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406
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132 rc = ngx_output_chain_align_file_buf(ctx, bsize);
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0
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133
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406
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134 if (rc == NGX_ERROR) {
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135 return NGX_ERROR;
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136 }
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0
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137
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406
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138 if (rc != NGX_OK) {
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0
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139
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406
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140 if (ctx->free) {
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0
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141
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406
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142 /* get the free buf */
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0
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143
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406
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144 cl = ctx->free;
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145 ctx->buf = cl->buf;
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146 ctx->free = cl->next;
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0
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147
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406
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148 ngx_free_chain(ctx->pool, cl);
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0
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149
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406
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150 } else if (out || ctx->allocated == ctx->bufs.num) {
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0
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151
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406
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152 break;
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0
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153
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406
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154 } else if (ngx_output_chain_get_buf(ctx, bsize) != NGX_OK) {
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0
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155 return NGX_ERROR;
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156 }
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157 }
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158 }
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159
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406
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160 rc = ngx_output_chain_copy_buf(ctx);
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0
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161
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162 if (rc == NGX_ERROR) {
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163 return rc;
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164 }
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165
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166 if (rc == NGX_AGAIN) {
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167 if (out) {
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168 break;
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169 }
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170
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171 return rc;
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172 }
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173
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174 /* delete the completed buf from the ctx->in chain */
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175
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176 if (ngx_buf_size(ctx->in->buf) == 0) {
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177 ctx->in = ctx->in->next;
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178 }
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179
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50
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180 cl = ngx_alloc_chain_link(ctx->pool);
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181 if (cl == NULL) {
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10
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182 return NGX_ERROR;
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183 }
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50
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184
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10
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185 cl->buf = ctx->buf;
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186 cl->next = NULL;
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0
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187 *last_out = cl;
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188 last_out = &cl->next;
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189 ctx->buf = NULL;
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190 }
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191
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192 if (out == NULL && last != NGX_NONE) {
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58
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193
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194 if (ctx->in) {
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195 return NGX_AGAIN;
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196 }
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197
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0
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198 return last;
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199 }
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200
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201 last = ctx->output_filter(ctx->filter_ctx, out);
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202
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118
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203 if (last == NGX_ERROR || last == NGX_DONE) {
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204 return last;
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205 }
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206
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0
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207 ngx_chain_update_chains(&ctx->free, &ctx->busy, &out, ctx->tag);
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208 last_out = &out;
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209 }
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210 }
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211
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212
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16
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213 static ngx_inline ngx_int_t
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406
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214 ngx_output_chain_as_is(ngx_output_chain_ctx_t *ctx, ngx_buf_t *buf)
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0
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215 {
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18
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216 ngx_uint_t sendfile;
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217
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0
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218 if (ngx_buf_special(buf)) {
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406
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219 return 1;
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220 }
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221
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222 if (buf->in_file && buf->file->directio) {
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0
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223 return 0;
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224 }
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225
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18
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226 sendfile = ctx->sendfile;
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227
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228 #if (NGX_SENDFILE_LIMIT)
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229
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230 if (buf->in_file && buf->file_pos >= NGX_SENDFILE_LIMIT) {
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231 sendfile = 0;
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232 }
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233
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234 #endif
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235
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236 if (!sendfile) {
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4
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237
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0
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238 if (!ngx_buf_in_memory(buf)) {
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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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242 buf->in_file = 0;
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243 }
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244
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245 if (ctx->need_in_memory && !ngx_buf_in_memory(buf)) {
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406
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246 return 0;
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0
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247 }
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248
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249 if (ctx->need_in_temp && (buf->memory || buf->mmap)) {
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406
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250 return 0;
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0
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251 }
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252
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406
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253 return 1;
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0
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254 }
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255
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256
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48
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257 static ngx_int_t
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258 ngx_output_chain_add_copy(ngx_pool_t *pool, ngx_chain_t **chain,
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259 ngx_chain_t *in)
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18
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260 {
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261 ngx_chain_t *cl, **ll;
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262 #if (NGX_SENDFILE_LIMIT)
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263 ngx_buf_t *b, *buf;
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264 #endif
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265
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266 ll = chain;
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267
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268 for (cl = *chain; cl; cl = cl->next) {
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269 ll = &cl->next;
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270 }
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271
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272 while (in) {
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273
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50
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274 cl = ngx_alloc_chain_link(pool);
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275 if (cl == NULL) {
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18
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276 return NGX_ERROR;
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277 }
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278
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279 #if (NGX_SENDFILE_LIMIT)
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280
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281 buf = in->buf;
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282
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283 if (buf->in_file
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284 && buf->file_pos < NGX_SENDFILE_LIMIT
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285 && buf->file_last > NGX_SENDFILE_LIMIT)
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286 {
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406
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287 /* split a file buf on two bufs by the sendfile limit */
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288
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50
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289 b = ngx_calloc_buf(pool);
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290 if (b == NULL) {
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18
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291 return NGX_ERROR;
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292 }
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293
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294 ngx_memcpy(b, buf, sizeof(ngx_buf_t));
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295
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296 if (ngx_buf_in_memory(buf)) {
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297 buf->pos += (ssize_t) (NGX_SENDFILE_LIMIT - buf->file_pos);
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298 b->last = buf->pos;
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299 }
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300
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301 buf->file_pos = NGX_SENDFILE_LIMIT;
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302 b->file_last = NGX_SENDFILE_LIMIT;
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303
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304 cl->buf = b;
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305
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306 } else {
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307 cl->buf = buf;
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308 in = in->next;
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309 }
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310
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311 #else
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312 cl->buf = in->buf;
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313 in = in->next;
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314
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315 #endif
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316
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317 *ll = cl;
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318 ll = &cl->next;
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319 }
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320
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321 *ll = NULL;
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322
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323 return NGX_OK;
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324 }
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325
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326
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48
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327 static ngx_int_t
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406
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328 ngx_output_chain_align_file_buf(ngx_output_chain_ctx_t *ctx, off_t bsize)
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329 {
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330 size_t size;
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331 ngx_buf_t *in;
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332
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333 in = ctx->in->buf;
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334
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335 if (in->file == NULL || !in->file->directio) {
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336 return NGX_DECLINED;
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337 }
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338
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339 ctx->directio = 1;
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340
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420
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341 size = (size_t) (in->file_pos - (in->file_pos & ~(NGX_DIRECTIO_BLOCK - 1)));
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406
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342
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343 if (size == 0) {
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344
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408
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345 if (bsize >= (off_t) ctx->bufs.size) {
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406
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346 return NGX_DECLINED;
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347 }
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348
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349 size = (size_t) bsize;
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350
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351 } else {
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420
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352 size = NGX_DIRECTIO_BLOCK - size;
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406
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353
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408
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354 if ((off_t) size > bsize) {
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406
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355 size = (size_t) bsize;
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356 }
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357 }
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358
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359 ctx->buf = ngx_create_temp_buf(ctx->pool, size);
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360 if (ctx->buf == NULL) {
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361 return NGX_ERROR;
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362 }
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363
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364 /*
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365 * we do not set ctx->buf->tag, because we do not want
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366 * to reuse the buf via ctx->free list
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367 */
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368
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410
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369 #if (NGX_HAVE_ALIGNED_DIRECTIO)
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370 ctx->unaligned = 1;
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371 #endif
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372
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406
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373 return NGX_OK;
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374 }
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375
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376
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377 static ngx_int_t
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378 ngx_output_chain_get_buf(ngx_output_chain_ctx_t *ctx, off_t bsize)
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0
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379 {
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406
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380 size_t size;
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381 ngx_buf_t *b, *in;
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382 ngx_uint_t recycled;
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383
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384 in = ctx->in->buf;
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385 size = ctx->bufs.size;
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386 recycled = 1;
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387
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388 if (in->last_in_chain) {
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389
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390 if (bsize < (off_t) size) {
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391
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392 /*
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393 * allocate a small temp buf for a small last buf
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394 * or its small last part
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395 */
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396
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397 size = (size_t) bsize;
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398 recycled = 0;
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399
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400 } else if (!ctx->directio
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401 && ctx->bufs.num == 1
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402 && (bsize < (off_t) (size + size / 4)))
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403 {
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404 /*
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405 * allocate a temp buf that equals to a last buf,
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406 * if there is no directio, the last buf size is lesser
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407 * than 1.25 of bufs.size and the temp buf is single
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408 */
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409
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410 size = (size_t) bsize;
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411 recycled = 0;
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412 }
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413 }
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414
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415 b = ngx_calloc_buf(ctx->pool);
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416 if (b == NULL) {
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417 return NGX_ERROR;
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418 }
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419
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|
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420 if (ctx->directio) {
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421
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|
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422 /*
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|
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423 * allocate block aligned to a disk sector size to enable
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424 * userland buffer direct usage conjunctly with directio
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425 */
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426
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420
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427 b->start = ngx_pmemalign(ctx->pool, size, NGX_DIRECTIO_BLOCK);
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|
406
|
428 if (b->start == NULL) {
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429 return NGX_ERROR;
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430 }
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|
431
|
|
|
432 } else {
|
|
|
433 b->start = ngx_palloc(ctx->pool, size);
|
|
|
434 if (b->start == NULL) {
|
|
|
435 return NGX_ERROR;
|
|
|
436 }
|
|
|
437 }
|
|
|
438
|
|
|
439 b->pos = b->start;
|
|
|
440 b->last = b->start;
|
|
|
441 b->end = b->last + size;
|
|
|
442 b->temporary = 1;
|
|
|
443 b->tag = ctx->tag;
|
|
|
444 b->recycled = recycled;
|
|
|
445
|
|
|
446 ctx->buf = b;
|
|
|
447 ctx->allocated++;
|
|
|
448
|
|
|
449 return NGX_OK;
|
|
|
450 }
|
|
|
451
|
|
|
452
|
|
|
453 static ngx_int_t
|
|
|
454 ngx_output_chain_copy_buf(ngx_output_chain_ctx_t *ctx)
|
|
|
455 {
|
|
|
456 off_t size;
|
|
|
457 ssize_t n;
|
|
|
458 ngx_buf_t *src, *dst;
|
|
|
459 ngx_uint_t sendfile;
|
|
|
460
|
|
|
461 src = ctx->in->buf;
|
|
|
462 dst = ctx->buf;
|
|
0
|
463
|
|
|
464 size = ngx_buf_size(src);
|
|
|
465
|
|
22
|
466 if (size > dst->end - dst->pos) {
|
|
0
|
467 size = dst->end - dst->pos;
|
|
|
468 }
|
|
|
469
|
|
406
|
470 sendfile = ctx->sendfile & !ctx->directio;
|
|
|
471
|
|
18
|
472 #if (NGX_SENDFILE_LIMIT)
|
|
|
473
|
|
|
474 if (src->in_file && src->file_pos >= NGX_SENDFILE_LIMIT) {
|
|
|
475 sendfile = 0;
|
|
|
476 }
|
|
|
477
|
|
|
478 #endif
|
|
|
479
|
|
0
|
480 if (ngx_buf_in_memory(src)) {
|
|
22
|
481 ngx_memcpy(dst->pos, src->pos, (size_t) size);
|
|
|
482 src->pos += (size_t) size;
|
|
|
483 dst->last += (size_t) size;
|
|
0
|
484
|
|
4
|
485 if (src->in_file) {
|
|
|
486
|
|
|
487 if (sendfile) {
|
|
|
488 dst->in_file = 1;
|
|
|
489 dst->file = src->file;
|
|
|
490 dst->file_pos = src->file_pos;
|
|
|
491 dst->file_last = src->file_pos + size;
|
|
|
492
|
|
|
493 } else {
|
|
|
494 dst->in_file = 0;
|
|
|
495 }
|
|
|
496
|
|
0
|
497 src->file_pos += size;
|
|
2
|
498
|
|
|
499 } else {
|
|
|
500 dst->in_file = 0;
|
|
0
|
501 }
|
|
|
502
|
|
306
|
503 if (src->pos == src->last) {
|
|
|
504 dst->flush = src->flush;
|
|
|
505 dst->last_buf = src->last_buf;
|
|
496
|
506 dst->last_in_chain = src->last_in_chain;
|
|
0
|
507 }
|
|
|
508
|
|
|
509 } else {
|
|
410
|
510
|
|
|
511 #if (NGX_HAVE_ALIGNED_DIRECTIO)
|
|
|
512
|
|
|
513 if (ctx->unaligned) {
|
|
|
514 if (ngx_directio_off(src->file->fd) == -1) {
|
|
|
515 ngx_log_error(NGX_LOG_ALERT, ctx->pool->log, ngx_errno,
|
|
|
516 ngx_directio_off_n " \"%s\" failed",
|
|
|
517 src->file->name.data);
|
|
|
518 }
|
|
|
519 }
|
|
|
520
|
|
|
521 #endif
|
|
|
522
|
|
22
|
523 n = ngx_read_file(src->file, dst->pos, (size_t) size, src->file_pos);
|
|
0
|
524
|
|
410
|
525 #if (NGX_HAVE_ALIGNED_DIRECTIO)
|
|
|
526
|
|
|
527 if (ctx->unaligned) {
|
|
|
528 ngx_err_t err;
|
|
|
529
|
|
|
530 err = ngx_errno;
|
|
|
531
|
|
|
532 if (ngx_directio_on(src->file->fd) == -1) {
|
|
|
533 ngx_log_error(NGX_LOG_ALERT, ctx->pool->log, ngx_errno,
|
|
|
534 ngx_directio_on_n " \"%s\" failed",
|
|
|
535 src->file->name.data);
|
|
|
536 }
|
|
|
537
|
|
|
538 ngx_set_errno(err);
|
|
|
539
|
|
|
540 ctx->unaligned = 0;
|
|
|
541 }
|
|
|
542
|
|
|
543 #endif
|
|
|
544
|
|
0
|
545 if (n == NGX_ERROR) {
|
|
66
|
546 return (ngx_int_t) n;
|
|
0
|
547 }
|
|
|
548
|
|
|
549 #if (NGX_FILE_AIO_READ)
|
|
|
550 if (n == NGX_AGAIN) {
|
|
66
|
551 return (ngx_int_t) n;
|
|
0
|
552 }
|
|
|
553 #endif
|
|
|
554
|
|
22
|
555 if (n != size) {
|
|
406
|
556 ngx_log_error(NGX_LOG_ALERT, ctx->pool->log, 0,
|
|
410
|
557 ngx_read_file_n " read only %z of %O from \"%s\"",
|
|
|
558 n, size, src->file->name.data);
|
|
0
|
559 if (n == 0) {
|
|
|
560 return NGX_ERROR;
|
|
|
561 }
|
|
|
562 }
|
|
|
563
|
|
|
564 dst->last += n;
|
|
|
565
|
|
2
|
566 if (sendfile) {
|
|
|
567 dst->in_file = 1;
|
|
|
568 dst->file = src->file;
|
|
|
569 dst->file_pos = src->file_pos;
|
|
4
|
570 dst->file_last = src->file_pos + n;
|
|
2
|
571
|
|
|
572 } else {
|
|
0
|
573 dst->in_file = 0;
|
|
|
574 }
|
|
|
575
|
|
4
|
576 src->file_pos += n;
|
|
|
577
|
|
308
|
578 if (src->file_pos == src->file_last) {
|
|
306
|
579 dst->flush = src->flush;
|
|
|
580 dst->last_buf = src->last_buf;
|
|
496
|
581 dst->last_in_chain = src->last_in_chain;
|
|
0
|
582 }
|
|
|
583 }
|
|
|
584
|
|
|
585 return NGX_OK;
|
|
|
586 }
|
|
|
587
|
|
|
588
|
|
48
|
589 ngx_int_t
|
|
|
590 ngx_chain_writer(void *data, ngx_chain_t *in)
|
|
0
|
591 {
|
|
|
592 ngx_chain_writer_ctx_t *ctx = data;
|
|
|
593
|
|
372
|
594 off_t size;
|
|
|
595 ngx_chain_t *cl;
|
|
|
596 ngx_connection_t *c;
|
|
|
597
|
|
|
598 c = ctx->connection;
|
|
0
|
599
|
|
22
|
600 for (size = 0; in; in = in->next) {
|
|
|
601
|
|
|
602 #if 1
|
|
|
603 if (ngx_buf_size(in->buf) == 0 && !ngx_buf_special(in->buf)) {
|
|
|
604 ngx_debug_point();
|
|
|
605 }
|
|
|
606 #endif
|
|
|
607
|
|
|
608 size += ngx_buf_size(in->buf);
|
|
0
|
609
|
|
372
|
610 ngx_log_debug2(NGX_LOG_DEBUG_CORE, c->log, 0,
|
|
306
|
611 "chain writer buf fl:%d s:%uO",
|
|
|
612 in->buf->flush, ngx_buf_size(in->buf));
|
|
0
|
613
|
|
50
|
614 cl = ngx_alloc_chain_link(ctx->pool);
|
|
|
615 if (cl == NULL) {
|
|
10
|
616 return NGX_ERROR;
|
|
|
617 }
|
|
50
|
618
|
|
10
|
619 cl->buf = in->buf;
|
|
|
620 cl->next = NULL;
|
|
0
|
621 *ctx->last = cl;
|
|
|
622 ctx->last = &cl->next;
|
|
|
623 }
|
|
|
624
|
|
372
|
625 ngx_log_debug1(NGX_LOG_DEBUG_CORE, c->log, 0,
|
|
10
|
626 "chain writer in: %p", ctx->out);
|
|
0
|
627
|
|
22
|
628 for (cl = ctx->out; cl; cl = cl->next) {
|
|
|
629
|
|
|
630 #if 1
|
|
|
631 if (ngx_buf_size(cl->buf) == 0 && !ngx_buf_special(cl->buf)) {
|
|
|
632 ngx_debug_point();
|
|
|
633 }
|
|
|
634
|
|
|
635 #endif
|
|
|
636
|
|
|
637 size += ngx_buf_size(cl->buf);
|
|
|
638 }
|
|
|
639
|
|
372
|
640 if (size == 0 && !c->buffered) {
|
|
22
|
641 return NGX_OK;
|
|
|
642 }
|
|
|
643
|
|
372
|
644 ctx->out = c->send_chain(c, ctx->out, ctx->limit);
|
|
0
|
645
|
|
372
|
646 ngx_log_debug1(NGX_LOG_DEBUG_CORE, c->log, 0,
|
|
10
|
647 "chain writer out: %p", ctx->out);
|
|
0
|
648
|
|
|
649 if (ctx->out == NGX_CHAIN_ERROR) {
|
|
|
650 return NGX_ERROR;
|
|
|
651 }
|
|
|
652
|
|
|
653 if (ctx->out == NULL) {
|
|
|
654 ctx->last = &ctx->out;
|
|
302
|
655
|
|
372
|
656 if (!c->buffered) {
|
|
304
|
657 return NGX_OK;
|
|
|
658 }
|
|
0
|
659 }
|
|
|
660
|
|
|
661 return NGX_AGAIN;
|
|
|
662 }
|
