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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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518
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19 * to device sector boundary (512 bytes). They fallback to usual read
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420
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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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18
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25
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26 #define NGX_NONE 1
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0
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27
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28
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16
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29 static ngx_inline ngx_int_t
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406
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30 ngx_output_chain_as_is(ngx_output_chain_ctx_t *ctx, ngx_buf_t *buf);
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18
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31 static ngx_int_t ngx_output_chain_add_copy(ngx_pool_t *pool,
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48
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32 ngx_chain_t **chain, ngx_chain_t *in);
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406
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33 static ngx_int_t ngx_output_chain_align_file_buf(ngx_output_chain_ctx_t *ctx,
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34 off_t bsize);
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35 static ngx_int_t ngx_output_chain_get_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_copy_buf(ngx_output_chain_ctx_t *ctx);
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0
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38
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39
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48
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40 ngx_int_t
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41 ngx_output_chain(ngx_output_chain_ctx_t *ctx, ngx_chain_t *in)
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0
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42 {
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22
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43 off_t bsize;
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146
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44 ngx_int_t rc, last;
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0
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45 ngx_chain_t *cl, *out, **last_out;
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46
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4
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47 if (ctx->in == NULL && ctx->busy == NULL) {
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0
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48
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18
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49 /*
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50 * the short path for the case when the ctx->in and ctx->busy chains
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51 * are empty, the incoming chain is empty too or has the single buf
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52 * that does not require the copy
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53 */
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0
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54
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55 if (in == NULL) {
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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 if (in->next == NULL
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18
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60 #if (NGX_SENDFILE_LIMIT)
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61 && !(in->buf->in_file && in->buf->file_last > NGX_SENDFILE_LIMIT)
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62 #endif
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406
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63 && ngx_output_chain_as_is(ctx, in->buf))
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0
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64 {
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65 return ctx->output_filter(ctx->filter_ctx, in);
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66 }
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67 }
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68
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69 /* add the incoming buf to the chain ctx->in */
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70
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71 if (in) {
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18
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72 if (ngx_output_chain_add_copy(ctx->pool, &ctx->in, in) == NGX_ERROR) {
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0
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73 return NGX_ERROR;
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74 }
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75 }
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76
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77 out = NULL;
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78 last_out = &out;
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48
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79 last = NGX_NONE;
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0
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80
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81 for ( ;; ) {
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82
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83 while (ctx->in) {
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84
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85 /*
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86 * cycle while there are the ctx->in bufs
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406
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87 * and there are the free output bufs to copy in
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0
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88 */
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89
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90 bsize = ngx_buf_size(ctx->in->buf);
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91
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92 if (bsize == 0 && !ngx_buf_special(ctx->in->buf)) {
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93
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94 ngx_log_error(NGX_LOG_ALERT, ctx->pool->log, 0,
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32
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95 "zero size buf in output "
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96 "t:%d r:%d f:%d %p %p-%p %p %O-%O",
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97 ctx->in->buf->temporary,
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98 ctx->in->buf->recycled,
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99 ctx->in->buf->in_file,
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100 ctx->in->buf->start,
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101 ctx->in->buf->pos,
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102 ctx->in->buf->last,
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103 ctx->in->buf->file,
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104 ctx->in->buf->file_pos,
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105 ctx->in->buf->file_last);
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0
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106
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22
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107 ngx_debug_point();
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108
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0
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109 ctx->in = ctx->in->next;
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110
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111 continue;
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112 }
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113
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406
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114 if (ngx_output_chain_as_is(ctx, ctx->in->buf)) {
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0
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115
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116 /* move the chain link to the output chain */
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117
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118 cl = ctx->in;
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119 ctx->in = cl->next;
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120
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121 *last_out = cl;
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122 last_out = &cl->next;
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123 cl->next = NULL;
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124
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125 continue;
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126 }
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127
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128 if (ctx->buf == NULL) {
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129
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406
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130 rc = ngx_output_chain_align_file_buf(ctx, bsize);
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0
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131
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406
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132 if (rc == NGX_ERROR) {
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133 return NGX_ERROR;
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134 }
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0
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135
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406
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136 if (rc != NGX_OK) {
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0
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137
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406
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138 if (ctx->free) {
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0
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139
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406
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140 /* get the free buf */
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0
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141
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406
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142 cl = ctx->free;
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143 ctx->buf = cl->buf;
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144 ctx->free = cl->next;
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0
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145
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406
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146 ngx_free_chain(ctx->pool, cl);
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0
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147
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406
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148 } else if (out || ctx->allocated == ctx->bufs.num) {
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0
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149
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406
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150 break;
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0
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151
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406
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152 } else if (ngx_output_chain_get_buf(ctx, bsize) != NGX_OK) {
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153 return NGX_ERROR;
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154 }
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155 }
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156 }
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157
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406
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158 rc = ngx_output_chain_copy_buf(ctx);
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0
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159
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160 if (rc == NGX_ERROR) {
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161 return rc;
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162 }
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163
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164 if (rc == NGX_AGAIN) {
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165 if (out) {
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166 break;
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167 }
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168
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169 return rc;
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170 }
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171
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172 /* delete the completed buf from the ctx->in chain */
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173
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174 if (ngx_buf_size(ctx->in->buf) == 0) {
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175 ctx->in = ctx->in->next;
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176 }
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177
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50
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178 cl = ngx_alloc_chain_link(ctx->pool);
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179 if (cl == NULL) {
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10
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180 return NGX_ERROR;
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181 }
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50
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182
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10
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183 cl->buf = ctx->buf;
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184 cl->next = NULL;
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0
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185 *last_out = cl;
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186 last_out = &cl->next;
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187 ctx->buf = NULL;
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188 }
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189
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190 if (out == NULL && last != NGX_NONE) {
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58
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191
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192 if (ctx->in) {
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193 return NGX_AGAIN;
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194 }
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195
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0
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196 return last;
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197 }
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198
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199 last = ctx->output_filter(ctx->filter_ctx, out);
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200
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118
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201 if (last == NGX_ERROR || last == NGX_DONE) {
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202 return last;
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203 }
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204
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0
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205 ngx_chain_update_chains(&ctx->free, &ctx->busy, &out, ctx->tag);
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206 last_out = &out;
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207 }
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208 }
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209
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210
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16
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211 static ngx_inline ngx_int_t
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406
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212 ngx_output_chain_as_is(ngx_output_chain_ctx_t *ctx, ngx_buf_t *buf)
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0
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213 {
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18
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214 ngx_uint_t sendfile;
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215
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0
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216 if (ngx_buf_special(buf)) {
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406
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217 return 1;
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218 }
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219
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220 if (buf->in_file && buf->file->directio) {
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0
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221 return 0;
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222 }
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223
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18
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224 sendfile = ctx->sendfile;
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225
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226 #if (NGX_SENDFILE_LIMIT)
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227
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228 if (buf->in_file && buf->file_pos >= NGX_SENDFILE_LIMIT) {
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229 sendfile = 0;
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230 }
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231
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232 #endif
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233
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234 if (!sendfile) {
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4
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235
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0
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236 if (!ngx_buf_in_memory(buf)) {
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406
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237 return 0;
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0
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238 }
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239
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240 buf->in_file = 0;
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241 }
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242
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243 if (ctx->need_in_memory && !ngx_buf_in_memory(buf)) {
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406
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244 return 0;
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0
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245 }
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246
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247 if (ctx->need_in_temp && (buf->memory || buf->mmap)) {
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406
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248 return 0;
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0
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249 }
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250
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406
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251 return 1;
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0
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252 }
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253
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254
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48
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255 static ngx_int_t
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256 ngx_output_chain_add_copy(ngx_pool_t *pool, ngx_chain_t **chain,
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257 ngx_chain_t *in)
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18
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258 {
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259 ngx_chain_t *cl, **ll;
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260 #if (NGX_SENDFILE_LIMIT)
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261 ngx_buf_t *b, *buf;
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262 #endif
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263
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264 ll = chain;
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265
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266 for (cl = *chain; cl; cl = cl->next) {
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267 ll = &cl->next;
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268 }
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269
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270 while (in) {
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271
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50
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272 cl = ngx_alloc_chain_link(pool);
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273 if (cl == NULL) {
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18
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274 return NGX_ERROR;
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275 }
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276
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277 #if (NGX_SENDFILE_LIMIT)
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278
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279 buf = in->buf;
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280
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281 if (buf->in_file
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282 && buf->file_pos < NGX_SENDFILE_LIMIT
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283 && buf->file_last > NGX_SENDFILE_LIMIT)
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284 {
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406
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285 /* split a file buf on two bufs by the sendfile limit */
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286
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50
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287 b = ngx_calloc_buf(pool);
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288 if (b == NULL) {
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18
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289 return NGX_ERROR;
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290 }
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291
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292 ngx_memcpy(b, buf, sizeof(ngx_buf_t));
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293
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294 if (ngx_buf_in_memory(buf)) {
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295 buf->pos += (ssize_t) (NGX_SENDFILE_LIMIT - buf->file_pos);
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296 b->last = buf->pos;
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297 }
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298
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299 buf->file_pos = NGX_SENDFILE_LIMIT;
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300 b->file_last = NGX_SENDFILE_LIMIT;
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301
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302 cl->buf = b;
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303
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304 } else {
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305 cl->buf = buf;
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306 in = in->next;
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307 }
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308
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309 #else
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310 cl->buf = in->buf;
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311 in = in->next;
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312
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313 #endif
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314
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496
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315 cl->next = NULL;
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18
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316 *ll = cl;
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317 ll = &cl->next;
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318 }
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319
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320 return NGX_OK;
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321 }
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322
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323
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48
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324 static ngx_int_t
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406
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325 ngx_output_chain_align_file_buf(ngx_output_chain_ctx_t *ctx, off_t bsize)
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326 {
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327 size_t size;
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328 ngx_buf_t *in;
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329
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330 in = ctx->in->buf;
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331
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332 if (in->file == NULL || !in->file->directio) {
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333 return NGX_DECLINED;
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334 }
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335
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336 ctx->directio = 1;
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337
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518
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338 size = (size_t) (in->file_pos - (in->file_pos & ~(ctx->alignment - 1)));
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406
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339
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340 if (size == 0) {
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341
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408
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342 if (bsize >= (off_t) ctx->bufs.size) {
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406
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343 return NGX_DECLINED;
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344 }
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345
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346 size = (size_t) bsize;
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347
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348 } else {
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518
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349 size = (size_t) ctx->alignment - size;
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406
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350
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408
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351 if ((off_t) size > bsize) {
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406
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352 size = (size_t) bsize;
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353 }
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354 }
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355
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356 ctx->buf = ngx_create_temp_buf(ctx->pool, size);
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357 if (ctx->buf == NULL) {
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358 return NGX_ERROR;
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359 }
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360
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361 /*
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362 * we do not set ctx->buf->tag, because we do not want
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363 * to reuse the buf via ctx->free list
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364 */
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365
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410
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366 #if (NGX_HAVE_ALIGNED_DIRECTIO)
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367 ctx->unaligned = 1;
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368 #endif
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369
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406
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370 return NGX_OK;
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371 }
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372
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373
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374 static ngx_int_t
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375 ngx_output_chain_get_buf(ngx_output_chain_ctx_t *ctx, off_t bsize)
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0
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376 {
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406
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377 size_t size;
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378 ngx_buf_t *b, *in;
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379 ngx_uint_t recycled;
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380
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381 in = ctx->in->buf;
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382 size = ctx->bufs.size;
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383 recycled = 1;
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384
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385 if (in->last_in_chain) {
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386
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387 if (bsize < (off_t) size) {
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388
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389 /*
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390 * allocate a small temp buf for a small last buf
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391 * or its small last part
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392 */
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393
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394 size = (size_t) bsize;
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395 recycled = 0;
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396
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397 } else if (!ctx->directio
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398 && ctx->bufs.num == 1
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399 && (bsize < (off_t) (size + size / 4)))
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400 {
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401 /*
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402 * allocate a temp buf that equals to a last buf,
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403 * if there is no directio, the last buf size is lesser
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404 * than 1.25 of bufs.size and the temp buf is single
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405 */
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406
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407 size = (size_t) bsize;
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408 recycled = 0;
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409 }
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410 }
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411
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412 b = ngx_calloc_buf(ctx->pool);
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413 if (b == NULL) {
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414 return NGX_ERROR;
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415 }
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416
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417 if (ctx->directio) {
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418
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|
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419 /*
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420 * allocate block aligned to a disk sector size to enable
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421 * userland buffer direct usage conjunctly with directio
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422 */
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423
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518
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424 b->start = ngx_pmemalign(ctx->pool, size, (size_t) ctx->alignment);
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406
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425 if (b->start == NULL) {
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426 return NGX_ERROR;
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427 }
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428
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|
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429 } else {
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|
|
430 b->start = ngx_palloc(ctx->pool, size);
|
|
|
431 if (b->start == NULL) {
|
|
|
432 return NGX_ERROR;
|
|
|
433 }
|
|
|
434 }
|
|
|
435
|
|
|
436 b->pos = b->start;
|
|
|
437 b->last = b->start;
|
|
|
438 b->end = b->last + size;
|
|
|
439 b->temporary = 1;
|
|
|
440 b->tag = ctx->tag;
|
|
|
441 b->recycled = recycled;
|
|
|
442
|
|
|
443 ctx->buf = b;
|
|
|
444 ctx->allocated++;
|
|
|
445
|
|
|
446 return NGX_OK;
|
|
|
447 }
|
|
|
448
|
|
|
449
|
|
|
450 static ngx_int_t
|
|
|
451 ngx_output_chain_copy_buf(ngx_output_chain_ctx_t *ctx)
|
|
|
452 {
|
|
|
453 off_t size;
|
|
|
454 ssize_t n;
|
|
|
455 ngx_buf_t *src, *dst;
|
|
|
456 ngx_uint_t sendfile;
|
|
|
457
|
|
|
458 src = ctx->in->buf;
|
|
|
459 dst = ctx->buf;
|
|
0
|
460
|
|
|
461 size = ngx_buf_size(src);
|
|
|
462
|
|
22
|
463 if (size > dst->end - dst->pos) {
|
|
0
|
464 size = dst->end - dst->pos;
|
|
|
465 }
|
|
|
466
|
|
406
|
467 sendfile = ctx->sendfile & !ctx->directio;
|
|
|
468
|
|
18
|
469 #if (NGX_SENDFILE_LIMIT)
|
|
|
470
|
|
|
471 if (src->in_file && src->file_pos >= NGX_SENDFILE_LIMIT) {
|
|
|
472 sendfile = 0;
|
|
|
473 }
|
|
|
474
|
|
|
475 #endif
|
|
|
476
|
|
0
|
477 if (ngx_buf_in_memory(src)) {
|
|
22
|
478 ngx_memcpy(dst->pos, src->pos, (size_t) size);
|
|
|
479 src->pos += (size_t) size;
|
|
|
480 dst->last += (size_t) size;
|
|
0
|
481
|
|
4
|
482 if (src->in_file) {
|
|
|
483
|
|
|
484 if (sendfile) {
|
|
|
485 dst->in_file = 1;
|
|
|
486 dst->file = src->file;
|
|
|
487 dst->file_pos = src->file_pos;
|
|
|
488 dst->file_last = src->file_pos + size;
|
|
|
489
|
|
|
490 } else {
|
|
|
491 dst->in_file = 0;
|
|
|
492 }
|
|
|
493
|
|
0
|
494 src->file_pos += size;
|
|
2
|
495
|
|
|
496 } else {
|
|
|
497 dst->in_file = 0;
|
|
0
|
498 }
|
|
|
499
|
|
306
|
500 if (src->pos == src->last) {
|
|
|
501 dst->flush = src->flush;
|
|
|
502 dst->last_buf = src->last_buf;
|
|
496
|
503 dst->last_in_chain = src->last_in_chain;
|
|
0
|
504 }
|
|
|
505
|
|
|
506 } else {
|
|
410
|
507
|
|
|
508 #if (NGX_HAVE_ALIGNED_DIRECTIO)
|
|
|
509
|
|
|
510 if (ctx->unaligned) {
|
|
|
511 if (ngx_directio_off(src->file->fd) == -1) {
|
|
|
512 ngx_log_error(NGX_LOG_ALERT, ctx->pool->log, ngx_errno,
|
|
|
513 ngx_directio_off_n " \"%s\" failed",
|
|
|
514 src->file->name.data);
|
|
|
515 }
|
|
|
516 }
|
|
|
517
|
|
|
518 #endif
|
|
|
519
|
|
518
|
520 #if (NGX_HAVE_FILE_AIO)
|
|
|
521
|
|
|
522 if (ctx->aio) {
|
|
|
523 n = ngx_file_aio_read(src->file, dst->pos, (size_t) size,
|
|
|
524 src->file_pos, ctx->pool);
|
|
|
525 if (n == NGX_AGAIN) {
|
|
|
526 ctx->aio(ctx, src->file);
|
|
|
527 return NGX_AGAIN;
|
|
|
528 }
|
|
|
529
|
|
|
530 } else {
|
|
|
531 n = ngx_read_file(src->file, dst->pos, (size_t) size,
|
|
|
532 src->file_pos);
|
|
|
533 }
|
|
|
534 #else
|
|
|
535
|
|
22
|
536 n = ngx_read_file(src->file, dst->pos, (size_t) size, src->file_pos);
|
|
0
|
537
|
|
518
|
538 #endif
|
|
|
539
|
|
410
|
540 #if (NGX_HAVE_ALIGNED_DIRECTIO)
|
|
|
541
|
|
|
542 if (ctx->unaligned) {
|
|
|
543 ngx_err_t err;
|
|
|
544
|
|
|
545 err = ngx_errno;
|
|
|
546
|
|
|
547 if (ngx_directio_on(src->file->fd) == -1) {
|
|
|
548 ngx_log_error(NGX_LOG_ALERT, ctx->pool->log, ngx_errno,
|
|
|
549 ngx_directio_on_n " \"%s\" failed",
|
|
|
550 src->file->name.data);
|
|
|
551 }
|
|
|
552
|
|
|
553 ngx_set_errno(err);
|
|
|
554
|
|
|
555 ctx->unaligned = 0;
|
|
|
556 }
|
|
|
557
|
|
|
558 #endif
|
|
|
559
|
|
0
|
560 if (n == NGX_ERROR) {
|
|
66
|
561 return (ngx_int_t) n;
|
|
0
|
562 }
|
|
|
563
|
|
22
|
564 if (n != size) {
|
|
406
|
565 ngx_log_error(NGX_LOG_ALERT, ctx->pool->log, 0,
|
|
410
|
566 ngx_read_file_n " read only %z of %O from \"%s\"",
|
|
|
567 n, size, src->file->name.data);
|
|
0
|
568 if (n == 0) {
|
|
|
569 return NGX_ERROR;
|
|
|
570 }
|
|
|
571 }
|
|
|
572
|
|
|
573 dst->last += n;
|
|
|
574
|
|
2
|
575 if (sendfile) {
|
|
|
576 dst->in_file = 1;
|
|
|
577 dst->file = src->file;
|
|
|
578 dst->file_pos = src->file_pos;
|
|
4
|
579 dst->file_last = src->file_pos + n;
|
|
2
|
580
|
|
|
581 } else {
|
|
0
|
582 dst->in_file = 0;
|
|
|
583 }
|
|
|
584
|
|
4
|
585 src->file_pos += n;
|
|
|
586
|
|
308
|
587 if (src->file_pos == src->file_last) {
|
|
306
|
588 dst->flush = src->flush;
|
|
|
589 dst->last_buf = src->last_buf;
|
|
496
|
590 dst->last_in_chain = src->last_in_chain;
|
|
0
|
591 }
|
|
|
592 }
|
|
|
593
|
|
|
594 return NGX_OK;
|
|
|
595 }
|
|
|
596
|
|
|
597
|
|
48
|
598 ngx_int_t
|
|
|
599 ngx_chain_writer(void *data, ngx_chain_t *in)
|
|
0
|
600 {
|
|
|
601 ngx_chain_writer_ctx_t *ctx = data;
|
|
|
602
|
|
372
|
603 off_t size;
|
|
|
604 ngx_chain_t *cl;
|
|
|
605 ngx_connection_t *c;
|
|
|
606
|
|
|
607 c = ctx->connection;
|
|
0
|
608
|
|
22
|
609 for (size = 0; in; in = in->next) {
|
|
|
610
|
|
|
611 #if 1
|
|
|
612 if (ngx_buf_size(in->buf) == 0 && !ngx_buf_special(in->buf)) {
|
|
|
613 ngx_debug_point();
|
|
|
614 }
|
|
|
615 #endif
|
|
|
616
|
|
|
617 size += ngx_buf_size(in->buf);
|
|
0
|
618
|
|
372
|
619 ngx_log_debug2(NGX_LOG_DEBUG_CORE, c->log, 0,
|
|
306
|
620 "chain writer buf fl:%d s:%uO",
|
|
|
621 in->buf->flush, ngx_buf_size(in->buf));
|
|
0
|
622
|
|
50
|
623 cl = ngx_alloc_chain_link(ctx->pool);
|
|
|
624 if (cl == NULL) {
|
|
10
|
625 return NGX_ERROR;
|
|
|
626 }
|
|
50
|
627
|
|
10
|
628 cl->buf = in->buf;
|
|
|
629 cl->next = NULL;
|
|
0
|
630 *ctx->last = cl;
|
|
|
631 ctx->last = &cl->next;
|
|
|
632 }
|
|
|
633
|
|
372
|
634 ngx_log_debug1(NGX_LOG_DEBUG_CORE, c->log, 0,
|
|
10
|
635 "chain writer in: %p", ctx->out);
|
|
0
|
636
|
|
22
|
637 for (cl = ctx->out; cl; cl = cl->next) {
|
|
|
638
|
|
|
639 #if 1
|
|
|
640 if (ngx_buf_size(cl->buf) == 0 && !ngx_buf_special(cl->buf)) {
|
|
|
641 ngx_debug_point();
|
|
|
642 }
|
|
|
643
|
|
|
644 #endif
|
|
|
645
|
|
|
646 size += ngx_buf_size(cl->buf);
|
|
|
647 }
|
|
|
648
|
|
372
|
649 if (size == 0 && !c->buffered) {
|
|
22
|
650 return NGX_OK;
|
|
|
651 }
|
|
|
652
|
|
372
|
653 ctx->out = c->send_chain(c, ctx->out, ctx->limit);
|
|
0
|
654
|
|
372
|
655 ngx_log_debug1(NGX_LOG_DEBUG_CORE, c->log, 0,
|
|
10
|
656 "chain writer out: %p", ctx->out);
|
|
0
|
657
|
|
|
658 if (ctx->out == NGX_CHAIN_ERROR) {
|
|
|
659 return NGX_ERROR;
|
|
|
660 }
|
|
|
661
|
|
|
662 if (ctx->out == NULL) {
|
|
|
663 ctx->last = &ctx->out;
|
|
302
|
664
|
|
372
|
665 if (!c->buffered) {
|
|
304
|
666 return NGX_OK;
|
|
|
667 }
|
|
0
|
668 }
|
|
|
669
|
|
|
670 return NGX_AGAIN;
|
|
|
671 }
|
