📄 ramdisk.c
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<!doctype html public "-//W3C//DTD HTML 3.2//EN"><html><head><title>Linux/kernel/blk_drv/ramdisk.c</title><meta http-equiv=Content-Type content="text/html; charset=gb2312"><base href="http://oldlinux.org/lxr/http/"></head><body bgcolor=white><div align=center> [<b><i>源代码浏览</i></b>] [<a href="diff/kernel/blk_drv/ramdisk.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><h1 align=center> <a href="http:/"> OldLinux</a> <a href="http:blurb.html"> 交叉引用</a><br> <a href="source/">Linux</a>/<a href="source/kernel/">kernel</a>/<a href="source/kernel/blk_drv/">blk_drv</a>/<a href="source/kernel/blk_drv/ramdisk.c">ramdisk.c</a></h1><div align=center> <b>版本:</b> [<a href="source/kernel/blk_drv/ramdisk.c?v=1.0">1.0</a>] [<a href="source/kernel/blk_drv/ramdisk.c?v=0.99.11">0.99.11</a>] [<a href="source/kernel/blk_drv/ramdisk.c?v=0.99">0.99</a>] [<a href="source/kernel/blk_drv/ramdisk.c?v=0.97">0.97</a>] [<a href="source/kernel/blk_drv/ramdisk.c?v=0.96a">0.96a</a>] [<a href="source/kernel/blk_drv/ramdisk.c?v=0.95">0.95</a>] [<a href="source/kernel/blk_drv/ramdisk.c?v=0.12">0.12</a>] [<b><i>0.11</i></b>] [<a href="source/kernel/blk_drv/ramdisk.c?v=0.01">0.01</a>] <br> <b>体系结构:</b> [<b><i>i386</i></b>] <br></div><hr><pre> <a name=L1 href="source/kernel/blk_drv/ramdisk.c#L1">1</a> <b><i>/*</i></b> <a name=L2 href="source/kernel/blk_drv/ramdisk.c#L2">2</a> <b><i> * linux/kernel/blk_drv/ramdisk.c</i></b> <a name=L3 href="source/kernel/blk_drv/ramdisk.c#L3">3</a> <b><i> *</i></b> <a name=L4 href="source/kernel/blk_drv/ramdisk.c#L4">4</a> <b><i> * Written by Theodore Ts'o, 12/2/91</i></b> <a name=L5 href="source/kernel/blk_drv/ramdisk.c#L5">5</a> <b><i> */</i></b> <a name=L6 href="source/kernel/blk_drv/ramdisk.c#L6">6</a> <a name=L7 href="source/kernel/blk_drv/ramdisk.c#L7">7</a> #include <string.h> <a name=L8 href="source/kernel/blk_drv/ramdisk.c#L8">8</a> <a name=L9 href="source/kernel/blk_drv/ramdisk.c#L9">9</a> #include <linux/config.h> <a name=L10 href="source/kernel/blk_drv/ramdisk.c#L10">10</a> #include <linux/sched.h> <a name=L11 href="source/kernel/blk_drv/ramdisk.c#L11">11</a> #include <linux/fs.h> <a name=L12 href="source/kernel/blk_drv/ramdisk.c#L12">12</a> #include <linux/kernel.h> <a name=L13 href="source/kernel/blk_drv/ramdisk.c#L13">13</a> #include <asm/system.h> <a name=L14 href="source/kernel/blk_drv/ramdisk.c#L14">14</a> #include <asm/segment.h> <a name=L15 href="source/kernel/blk_drv/ramdisk.c#L15">15</a> #include <asm/memory.h> <a name=L16 href="source/kernel/blk_drv/ramdisk.c#L16">16</a> <a name=L17 href="source/kernel/blk_drv/ramdisk.c#L17">17</a> #define <a href="ident?i=MAJOR_NR">MAJOR_NR</a> 1 <a name=L18 href="source/kernel/blk_drv/ramdisk.c#L18">18</a> #include "<a href="source/kernel/blk_drv/blk.h">blk.h</a>" <a name=L19 href="source/kernel/blk_drv/ramdisk.c#L19">19</a> <a name=L20 href="source/kernel/blk_drv/ramdisk.c#L20">20</a> char *<a href="ident?i=rd_start">rd_start</a>; <a name=L21 href="source/kernel/blk_drv/ramdisk.c#L21">21</a> int <a href="ident?i=rd_length">rd_length</a> = 0; <a name=L22 href="source/kernel/blk_drv/ramdisk.c#L22">22</a> <a name=L23 href="source/kernel/blk_drv/ramdisk.c#L23">23</a> void <a href="ident?i=do_rd_request">do_rd_request</a>(void) <a name=L24 href="source/kernel/blk_drv/ramdisk.c#L24">24</a> { <a name=L25 href="source/kernel/blk_drv/ramdisk.c#L25">25</a> int len; <a name=L26 href="source/kernel/blk_drv/ramdisk.c#L26">26</a> char *addr; <a name=L27 href="source/kernel/blk_drv/ramdisk.c#L27">27</a> <a name=L28 href="source/kernel/blk_drv/ramdisk.c#L28">28</a> <a href="ident?i=INIT_REQUEST">INIT_REQUEST</a>; <a name=L29 href="source/kernel/blk_drv/ramdisk.c#L29">29</a> addr = <a href="ident?i=rd_start">rd_start</a> + (<a href="ident?i=CURRENT">CURRENT</a>-><a href="ident?i=sector">sector</a> << 9); <a name=L30 href="source/kernel/blk_drv/ramdisk.c#L30">30</a> len = <a href="ident?i=CURRENT">CURRENT</a>->nr_sectors << 9; <a name=L31 href="source/kernel/blk_drv/ramdisk.c#L31">31</a> if ((<a href="ident?i=MINOR">MINOR</a>(<a href="ident?i=CURRENT">CURRENT</a>->dev) != 1) || (addr+len > <a href="ident?i=rd_start">rd_start</a>+<a href="ident?i=rd_length">rd_length</a>)) { <a name=L32 href="source/kernel/blk_drv/ramdisk.c#L32">32</a> <a href="ident?i=end_request">end_request</a>(0); <a name=L33 href="source/kernel/blk_drv/ramdisk.c#L33">33</a> goto repeat; <a name=L34 href="source/kernel/blk_drv/ramdisk.c#L34">34</a> } <a name=L35 href="source/kernel/blk_drv/ramdisk.c#L35">35</a> if (<a href="ident?i=CURRENT">CURRENT</a>-> cmd == <a href="ident?i=WRITE">WRITE</a>) { <a name=L36 href="source/kernel/blk_drv/ramdisk.c#L36">36</a> (void ) <a href="ident?i=memcpy">memcpy</a>(addr, <a name=L37 href="source/kernel/blk_drv/ramdisk.c#L37">37</a> <a href="ident?i=CURRENT">CURRENT</a>->buffer, <a name=L38 href="source/kernel/blk_drv/ramdisk.c#L38">38</a> len); <a name=L39 href="source/kernel/blk_drv/ramdisk.c#L39">39</a> } else if (<a href="ident?i=CURRENT">CURRENT</a>->cmd == <a href="ident?i=READ">READ</a>) { <a name=L40 href="source/kernel/blk_drv/ramdisk.c#L40">40</a> (void) <a href="ident?i=memcpy">memcpy</a>(<a href="ident?i=CURRENT">CURRENT</a>->buffer, <a name=L41 href="source/kernel/blk_drv/ramdisk.c#L41">41</a> addr, <a name=L42 href="source/kernel/blk_drv/ramdisk.c#L42">42</a> len); <a name=L43 href="source/kernel/blk_drv/ramdisk.c#L43">43</a> } else <a name=L44 href="source/kernel/blk_drv/ramdisk.c#L44">44</a> <a href="ident?i=panic">panic</a>(<i>"unknown ramdisk-command"</i>); <a name=L45 href="source/kernel/blk_drv/ramdisk.c#L45">45</a> <a href="ident?i=end_request">end_request</a>(1); <a name=L46 href="source/kernel/blk_drv/ramdisk.c#L46">46</a> goto repeat; <a name=L47 href="source/kernel/blk_drv/ramdisk.c#L47">47</a> } <a name=L48 href="source/kernel/blk_drv/ramdisk.c#L48">48</a> <a name=L49 href="source/kernel/blk_drv/ramdisk.c#L49">49</a> <b><i>/*</i></b> <a name=L50 href="source/kernel/blk_drv/ramdisk.c#L50">50</a> <b><i> * Returns amount of memory which needs to be reserved.</i></b> <a name=L51 href="source/kernel/blk_drv/ramdisk.c#L51">51</a> <b><i> */</i></b> <a name=L52 href="source/kernel/blk_drv/ramdisk.c#L52">52</a> long <a href="ident?i=rd_init">rd_init</a>(long mem_start, int length) <a name=L53 href="source/kernel/blk_drv/ramdisk.c#L53">53</a> {⌨️ 快捷键说明
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