📄 open.c
字号:
<a name=L95 href="source/fs/open.c#L95">95</a> return -<a href="ident?i=ENOENT">ENOENT</a>; <a name=L96 href="source/fs/open.c#L96">96</a> if (!<a href="ident?i=S_ISDIR">S_ISDIR</a>(inode->i_mode)) { <a name=L97 href="source/fs/open.c#L97">97</a> <a href="ident?i=iput">iput</a>(inode); <a name=L98 href="source/fs/open.c#L98">98</a> return -<a href="ident?i=ENOTDIR">ENOTDIR</a>; <a name=L99 href="source/fs/open.c#L99">99</a> }<a name=L100 href="source/fs/open.c#L100">100</a> <a href="ident?i=iput">iput</a>(<a href="ident?i=current">current</a>->root);<a name=L101 href="source/fs/open.c#L101">101</a> <a href="ident?i=current">current</a>->root = inode;<a name=L102 href="source/fs/open.c#L102">102</a> return (0);<a name=L103 href="source/fs/open.c#L103">103</a> }<a name=L104 href="source/fs/open.c#L104">104</a> <a name=L105 href="source/fs/open.c#L105">105</a> int <a href="ident?i=sys_chmod">sys_chmod</a>(const char * filename,int mode)<a name=L106 href="source/fs/open.c#L106">106</a> {<a name=L107 href="source/fs/open.c#L107">107</a> struct <a href="ident?i=m_inode">m_inode</a> * inode;<a name=L108 href="source/fs/open.c#L108">108</a> <a name=L109 href="source/fs/open.c#L109">109</a> if (!(inode=<a href="ident?i=namei">namei</a>(filename)))<a name=L110 href="source/fs/open.c#L110">110</a> return -<a href="ident?i=ENOENT">ENOENT</a>;<a name=L111 href="source/fs/open.c#L111">111</a> if ((<a href="ident?i=current">current</a>->euid != inode->i_uid) && !<a href="ident?i=suser">suser</a>()) {<a name=L112 href="source/fs/open.c#L112">112</a> <a href="ident?i=iput">iput</a>(inode);<a name=L113 href="source/fs/open.c#L113">113</a> return -<a href="ident?i=EACCES">EACCES</a>;<a name=L114 href="source/fs/open.c#L114">114</a> }<a name=L115 href="source/fs/open.c#L115">115</a> inode->i_mode = (mode & 07777) | (inode->i_mode & ~07777);<a name=L116 href="source/fs/open.c#L116">116</a> inode->i_dirt = 1;<a name=L117 href="source/fs/open.c#L117">117</a> <a href="ident?i=iput">iput</a>(inode);<a name=L118 href="source/fs/open.c#L118">118</a> return 0;<a name=L119 href="source/fs/open.c#L119">119</a> }<a name=L120 href="source/fs/open.c#L120">120</a> <a name=L121 href="source/fs/open.c#L121">121</a> int <a href="ident?i=sys_chown">sys_chown</a>(const char * filename,int uid,int gid)<a name=L122 href="source/fs/open.c#L122">122</a> {<a name=L123 href="source/fs/open.c#L123">123</a> struct <a href="ident?i=m_inode">m_inode</a> * inode;<a name=L124 href="source/fs/open.c#L124">124</a> <a name=L125 href="source/fs/open.c#L125">125</a> if (!(inode=<a href="ident?i=namei">namei</a>(filename)))<a name=L126 href="source/fs/open.c#L126">126</a> return -<a href="ident?i=ENOENT">ENOENT</a>;<a name=L127 href="source/fs/open.c#L127">127</a> if (!<a href="ident?i=suser">suser</a>()) {<a name=L128 href="source/fs/open.c#L128">128</a> <a href="ident?i=iput">iput</a>(inode);<a name=L129 href="source/fs/open.c#L129">129</a> return -<a href="ident?i=EACCES">EACCES</a>;<a name=L130 href="source/fs/open.c#L130">130</a> }<a name=L131 href="source/fs/open.c#L131">131</a> inode->i_uid=uid;<a name=L132 href="source/fs/open.c#L132">132</a> inode->i_gid=gid;<a name=L133 href="source/fs/open.c#L133">133</a> inode->i_dirt=1;<a name=L134 href="source/fs/open.c#L134">134</a> <a href="ident?i=iput">iput</a>(inode);<a name=L135 href="source/fs/open.c#L135">135</a> return 0;<a name=L136 href="source/fs/open.c#L136">136</a> }<a name=L137 href="source/fs/open.c#L137">137</a> <a name=L138 href="source/fs/open.c#L138">138</a> int <a href="ident?i=sys_open">sys_open</a>(const char * filename,int flag,int mode)<a name=L139 href="source/fs/open.c#L139">139</a> {<a name=L140 href="source/fs/open.c#L140">140</a> struct <a href="ident?i=m_inode">m_inode</a> * inode;<a name=L141 href="source/fs/open.c#L141">141</a> struct <a href="ident?i=file">file</a> * f;<a name=L142 href="source/fs/open.c#L142">142</a> int i,fd;<a name=L143 href="source/fs/open.c#L143">143</a> <a name=L144 href="source/fs/open.c#L144">144</a> mode &= 0777 & ~current-><a href="ident?i=umask">umask</a>;<a name=L145 href="source/fs/open.c#L145">145</a> for(fd=0 ; fd<<a href="ident?i=NR_OPEN">NR_OPEN</a> ; fd++)<a name=L146 href="source/fs/open.c#L146">146</a> if (!<a href="ident?i=current">current</a>->filp[fd])<a name=L147 href="source/fs/open.c#L147">147</a> break;<a name=L148 href="source/fs/open.c#L148">148</a> if (fd>=<a href="ident?i=NR_OPEN">NR_OPEN</a>)<a name=L149 href="source/fs/open.c#L149">149</a> return -<a href="ident?i=EINVAL">EINVAL</a>;<a name=L150 href="source/fs/open.c#L150">150</a> <a href="ident?i=current">current</a>->close_on_exec &= ~(1<<fd);<a name=L151 href="source/fs/open.c#L151">151</a> f=0+<a href="ident?i=file_table">file_table</a>;<a name=L152 href="source/fs/open.c#L152">152</a> for (i=0 ; i<<a href="ident?i=NR_FILE">NR_FILE</a> ; i++,f++)<a name=L153 href="source/fs/open.c#L153">153</a> if (!f->f_count) break;<a name=L154 href="source/fs/open.c#L154">154</a> if (i>=<a href="ident?i=NR_FILE">NR_FILE</a>)<a name=L155 href="source/fs/open.c#L155">155</a> return -<a href="ident?i=EINVAL">EINVAL</a>;<a name=L156 href="source/fs/open.c#L156">156</a> (<a href="ident?i=current">current</a>->filp[fd]=f)->f_count++;<a name=L157 href="source/fs/open.c#L157">157</a> if ((i=<a href="ident?i=open_namei">open_namei</a>(filename,flag,mode,&inode))<0) {<a name=L158 href="source/fs/open.c#L158">158</a> <a href="ident?i=current">current</a>->filp[fd]=<a href="ident?i=NULL">NULL</a>;<a name=L159 href="source/fs/open.c#L159">159</a> f->f_count=0;<a name=L160 href="source/fs/open.c#L160">160</a> return i;<a name=L161 href="source/fs/open.c#L161">161</a> }<a name=L162 href="source/fs/open.c#L162">162</a> <b><i>/* ttys are somewhat special (ttyxx major==4, tty major==5) */</i></b><a name=L163 href="source/fs/open.c#L163">163</a> if (<a href="ident?i=S_ISCHR">S_ISCHR</a>(inode->i_mode))<a name=L164 href="source/fs/open.c#L164">164</a> if (<a href="ident?i=MAJOR">MAJOR</a>(inode->i_zone[0])==4) {<a name=L165 href="source/fs/open.c#L165">165</a> if (<a href="ident?i=current">current</a>->leader && <a href="ident?i=current">current</a>->tty<0) {<a name=L166 href="source/fs/open.c#L166">166</a> <a href="ident?i=current">current</a>->tty = <a href="ident?i=MINOR">MINOR</a>(inode->i_zone[0]);<a name=L167 href="source/fs/open.c#L167">167</a> <a href="ident?i=tty_table">tty_table</a>[<a href="ident?i=current">current</a>->tty].pgrp = <a href="ident?i=current">current</a>->pgrp;<a name=L168 href="source/fs/open.c#L168">168</a> }<a name=L169 href="source/fs/open.c#L169">169</a> } else if (<a href="ident?i=MAJOR">MAJOR</a>(inode->i_zone[0])==5)<a name=L170 href="source/fs/open.c#L170">170</a> if (<a href="ident?i=current">current</a>->tty<0) {<a name=L171 href="source/fs/open.c#L171">171</a> <a href="ident?i=iput">iput</a>(inode);<a name=L172 href="source/fs/open.c#L172">172</a> <a href="ident?i=current">current</a>->filp[fd]=<a href="ident?i=NULL">NULL</a>;<a name=L173 href="source/fs/open.c#L173">173</a> f->f_count=0;<a name=L174 href="source/fs/open.c#L174">174</a> return -<a href="ident?i=EPERM">EPERM</a>;<a name=L175 href="source/fs/open.c#L175">175</a> }<a name=L176 href="source/fs/open.c#L176">176</a> <b><i>/* Likewise with block-devices: check for floppy_change */</i></b><a name=L177 href="source/fs/open.c#L177">177</a> if (<a href="ident?i=S_ISBLK">S_ISBLK</a>(inode->i_mode))<a name=L178 href="source/fs/open.c#L178">178</a> <a href="ident?i=check_disk_change">check_disk_change</a>(inode->i_zone[0]);<a name=L179 href="source/fs/open.c#L179">179</a> f->f_mode = inode->i_mode;<a name=L180 href="source/fs/open.c#L180">180</a> f->f_flags = flag;<a name=L181 href="source/fs/open.c#L181">181</a> f->f_count = 1;<a name=L182 href="source/fs/open.c#L182">182</a> f->f_inode = inode;<a name=L183 href="source/fs/open.c#L183">183</a> f->f_pos = 0;<a name=L184 href="source/fs/open.c#L184">184</a> return (fd);<a name=L185 href="source/fs/open.c#L185">185</a> }<a name=L186 href="source/fs/open.c#L186">186</a> <a name=L187 href="source/fs/open.c#L187">187</a> int <a href="ident?i=sys_creat">sys_creat</a>(const char * pathname, int mode)<a name=L188 href="source/fs/open.c#L188">188</a> {<a name=L189 href="source/fs/open.c#L189">189</a> return <a href="ident?i=sys_open">sys_open</a>(pathname, <a href="ident?i=O_CREAT">O_CREAT</a> | <a href="ident?i=O_TRUNC">O_TRUNC</a>, mode);<a name=L190 href="source/fs/open.c#L190">190</a> }<a name=L191 href="source/fs/open.c#L191">191</a> <a name=L192 href="source/fs/open.c#L192">192</a> int <a href="ident?i=sys_close">sys_close</a>(unsigned int fd)<a name=L193 href="source/fs/open.c#L193">193</a> { <a name=L194 href="source/fs/open.c#L194">194</a> struct <a href="ident?i=file">file</a> * filp;<a name=L195 href="source/fs/open.c#L195">195</a> <a name=L196 href="source/fs/open.c#L196">196</a> if (fd >= <a href="ident?i=NR_OPEN">NR_OPEN</a>)<a name=L197 href="source/fs/open.c#L197">197</a> return -<a href="ident?i=EINVAL">EINVAL</a>;<a name=L198 href="source/fs/open.c#L198">198</a> <a href="ident?i=current">current</a>->close_on_exec &= ~(1<<fd);<a name=L199 href="source/fs/open.c#L199">199</a> if (!(filp = <a href="ident?i=current">current</a>->filp[fd]))<a name=L200 href="source/fs/open.c#L200">200</a> return -<a href="ident?i=EINVAL">EINVAL</a>;<a name=L201 href="source/fs/open.c#L201">201</a> <a href="ident?i=current">current</a>->filp[fd] = <a href="ident?i=NULL">NULL</a>;<a name=L202 href="source/fs/open.c#L202">202</a> if (filp->f_count == 0)<a name=L203 href="source/fs/open.c#L203">203</a> <a href="ident?i=panic">panic</a>(<i>"Close: file count is 0"</i>);<a name=L204 href="source/fs/open.c#L204">204</a> if (--filp->f_count)<a name=L205 href="source/fs/open.c#L205">205</a> return (0);<a name=L206 href="source/fs/open.c#L206">206</a> <a href="ident?i=iput">iput</a>(filp->f_inode);<a name=L207 href="source/fs/open.c#L207">207</a> return (0);<a name=L208 href="source/fs/open.c#L208">208</a> }<a name=L209 href="source/fs/open.c#L209">209</a> </pre><hr><div align=center> [<b><i>源代码浏览</i></b>] [<a href="diff/fs/open.c">区别标定</a>] [<a href="ident">标识符搜索</a>] [<a href="search">文本搜索</a>] [<a href="find">文件搜索</a>] </div><hr>本网页由 <a href="http:blurb.html">LXR引擎</a> 自动生成.<br></html>⌨️ 快捷键说明
复制代码
Ctrl + C
搜索代码
Ctrl + F
全屏模式
F11
切换主题
Ctrl + Shift + D
显示快捷键
?
增大字号
Ctrl + =
减小字号
Ctrl + -