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<p class=ab><a name="_Toc53320620"><span style='font-family:黑体'>程序</span><span
lang=EN-US>9-4 linux/kernel/blk_drv/ramdisk.c</span></a></p>
<div class=a align=center style='text-align:center'><span lang=EN-US>
<hr size=4 width="100%" align=center>
</span></div>
<p class=a><span lang=EN-US>&nbsp; <u><span style='color:blue'>1</span></u> <b><i>/*</i></b></span></p>
<p class=a><span lang=EN-US>&nbsp; <u><span style='color:blue'>2</span></u> <b><i>&nbsp;*&nbsp;
linux/kernel/blk_drv/ramdisk.c</i></b></span></p>
<p class=a><span lang=EN-US>&nbsp; <u><span style='color:blue'>3</span></u> <b><i>&nbsp;*</i></b></span></p>
<p class=a><span lang=EN-US>&nbsp; <u><span style='color:blue'>4</span></u> <b><i>&nbsp;*&nbsp;
Written by Theodore Ts'o, 12/2/91</i></b></span></p>
<p class=a><span lang=EN-US>&nbsp; <u><span style='color:blue'>5</span></u> <b><i>&nbsp;*/</i></b></span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; /* </span><span lang=EN-US>Theodore
Ts'o</span>编制,<span
lang=EN-US>12/2/91</span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp; */</span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // Theodore Ts'o (Ted Ts'o)</span><span
lang=EN-US>Linux</span>社区中的著名人物。<span lang=EN-US>Linux</span>在世界范围内的流行也有他很</p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>大的功劳。早在<span
lang=EN-US>Linux</span>操作系统刚问世时,他就怀着极大的热情为<span lang=EN-US>Linux</span>的发展提供了电子邮</p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>件列表服务<span lang=EN-US>maillist</span>,并在北美地区最早设立了<span
lang=EN-US>Linux</span><span lang=EN-US>ftp</span>服务器站点(<span lang=EN-US>tsx-11.mit.edu</span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>而且至今仍为广大<span
lang=EN-US>Linux</span>用户提供服务。他对<span lang=EN-US>Linux</span>作出的最大贡献之一是提出并实现了<span
lang=EN-US>ext2</span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>文件系统。该文件系统已成为<span
lang=EN-US>Linux</span>世界中事实上的文件系统标准。最近他又推出了<span lang=EN-US>ext3</span>文件</p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>系统,大大提高了文件系统的稳定性、可恢复性和访问效率。作为对他的推崇,第<span
lang=EN-US>97</span>期(<span lang=EN-US>2002</span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><span lang=EN-US>5</span>月)的<span
lang=EN-US>LinuxJournal</span>期刊将他作为了封面人物,并对他进行了采访。目前他为<span lang=EN-US>IBM Linux</span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>技术中心工作,并从事着有关<span
lang=EN-US>LSB (Linux Standard Base)</span>等方面的工作。(他的个人主页是:</p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // http://thunk.org/tytso/)</span></p>
<p class=a><span lang=EN-US>&nbsp; <u><span style='color:blue'>6</span></u> </span></p>
<p class=a><span lang=EN-US>&nbsp; <u><span style='color:blue'>7</span></u>
#include &lt;string.h&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; // </span>字符串头文件。主要定义了一些有关字符串操作的嵌入函数。</p>
<p class=a><span lang=EN-US>&nbsp; <u><span style='color:blue'>8</span></u> </span></p>
<p class=a><span lang=EN-US>&nbsp; <u><span style='color:blue'>9</span></u>
#include &lt;linux/config.h&gt; // </span>内核配置头文件。定义键盘语言和硬盘类型(<span lang=EN-US>HD_TYPE</span>)可选项。</p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>10</span></u>
#include &lt;linux/sched.h&gt;&nbsp; // </span>调度程序头文件,定义了任务结构<span lang=EN-US>task_struct</span>、任务<span
lang=EN-US>0</span>的数据,</p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
&nbsp;&nbsp;// </span>还有一些有关描述符参数设置和获取的嵌入式汇编函数宏语句。</p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>11</span></u>
#include &lt;linux/fs.h&gt;&nbsp;&nbsp;&nbsp;&nbsp; // </span>文件系统头文件。定义文件表结构(<span
lang=EN-US>file</span><span lang=EN-US>m_inode</span>)等。</p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>12</span></u>
#include &lt;linux/kernel.h&gt; // </span>内核头文件。含有一些内核常用函数的原型定义。</p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>13</span></u>
#include &lt;asm/system.h&gt;&nbsp;&nbsp; // </span>系统头文件。定义了设置或修改描述符<span
lang=EN-US>/</span>中断门等嵌入式汇编宏。</p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>14</span></u>
#include &lt;asm/segment.h&gt;&nbsp; // </span>段操作头文件。定义了有关段寄存器操作的嵌入式汇编函数。</p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>15</span></u>
#include &lt;asm/memory.h&gt;&nbsp;&nbsp; // </span>内存拷贝头文件。含有<span lang=EN-US>memcpy()</span>嵌入式汇编宏函数。</p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>16</span></u> </span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>定义<span lang=EN-US>RAM</span>盘主设备号符号常数。在驱动程序中主设备号必须在包含<span
lang=EN-US>blk.h</span>文件之前被定义。</p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>因为<span lang=EN-US>blk.h</span>文件中要用到这个符号常数值来确定一些列的其他常数符号和宏。</p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>17</span></u>
#define <u><span style='color:blue'>MAJOR_NR</span></u> 1</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>18</span></u>
#include &quot;<u><span style='color:blue'>blk.h</span></u>&quot;</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>19</span></u> </span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>虚拟盘在内存中的起始位置。该位置会在第<span
lang=EN-US>52</span>行上初始化函数<span lang=EN-US>rd_init()</span>中确定。参见内核</p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>初始化程序<span lang=EN-US>init/main.c</span>,第<span
lang=EN-US>124</span>行。<span lang=EN-US>'rd'</span><span lang=EN-US>'ramdisk'</span>的缩写。</p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>20</span></u>
char&nbsp; &nbsp;&nbsp;*<u><span style='color:blue'>rd_start</span></u>;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
// </span>虚拟盘在内存中的开始地址。</p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>21</span></u>
int&nbsp;&nbsp;&nbsp;&nbsp; <u><span style='color:blue'>rd_length</span></u> =
0;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
// </span>虚拟盘所占内存大小(字节)。</p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>22</span></u> </span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>虚拟盘当前请求项操作函数。</p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>该函数的程序结构与硬盘的<span
lang=EN-US>do_hd_request()</span>函数类似,参见<span lang=EN-US>hd.c</span><span
lang=EN-US>294</span>行。在低级块设备</p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>接口函数<span lang=EN-US>ll_rw_block()</span>建立起虚拟盘(<span
lang=EN-US>rd</span>)的请求项并添加到 <span lang=EN-US>rd</span>的链表中之后,就会调</p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>用该函数对 <span
lang=EN-US>rd</span>当前请求项进行处理。该函数首先计算当前请求项中指定的起始扇区对应虚</p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>拟盘所处内存的起始位置<span
lang=EN-US>addr </span>和要求的扇区数对应的字节长度值 <span lang=EN-US>len</span>,然后根据请求项中</p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>的命令进行操作。若是写命令<span
lang=EN-US>WRITE</span>,就把请求项所指缓冲区中的数据直接复制到内存位置</p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // addr</span>处。若是读操作则反之。数据复制完成后即可直接调用
<span lang=EN-US>end_request() </span>对本次请求项</p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>作结束处理。然后跳转到函数开始处再去处理下一个请求项。若已没有请求项则退出。</p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>23</span></u>
void <u><span style='color:blue'>do_rd_request</span></u>(void)</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>24</span></u> {</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>25</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
int&nbsp;&nbsp;&nbsp;&nbsp; len;</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>26</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
char&nbsp;&nbsp;&nbsp; *addr;</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>27</span></u> </span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>首先检测请求项的合法性,若已没有请求项则退出(参见<span
lang=EN-US>blk.h</span>,第<span lang=EN-US>127</span>行)。然后计算请</p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>求项处理的虚拟盘中起始扇区在物理内存中对应的地址<span
lang=EN-US>addr</span>和占用的内存字节长度值<span lang=EN-US>len</span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>下句用于取得请求项中的起始扇区对应的内存起始位置和内存长度。其中<span
lang=EN-US>sector &lt;&lt; 9</span>表示</p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // sector * 512</span>,换算成字节值。<span
lang=EN-US>CURRENT</span>被定义为 <span lang=EN-US>(blk_dev[MAJOR_NR].current_request)</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>28</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
<u><span style='color:blue'>INIT_REQUEST</span></u>;</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>29</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
addr = <u><span style='color:blue'>rd_start</span></u> + (<u><span
style='color:blue'>CURRENT</span></u>-&gt;<u><span style='color:blue'>sector</span></u>
&lt;&lt; 9);</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>30</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
len = <u><span style='color:blue'>CURRENT</span></u>-&gt;nr_sectors &lt;&lt; 9;</span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>如果当前请求项中子设备号不为<span
lang=EN-US>1</span>或者对应内存起始位置大于虚拟盘末尾,则结束该请求项,</p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>并跳转到 <span lang=EN-US>repeat
</span>处去处理下一个虚拟盘请求项。标号 <span lang=EN-US>repeat </span>定义在宏<span lang=EN-US>
INIT_REQUEST </span>内,</p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>位于宏的开始处,参见<span
lang=EN-US>blk.h</span>文件第<span lang=EN-US>127</span>行。</p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>31</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
if ((<u><span style='color:blue'>MINOR</span></u>(<u><span style='color:blue'>CURRENT</span></u>-&gt;dev)
!= 1) || (addr+len &gt; <u><span style='color:blue'>rd_start</span></u>+<u><span
style='color:blue'>rd_length</span></u>)) {</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>32</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
<u><span style='color:blue'>end_request</span></u>(0);</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>33</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
goto repeat;</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>34</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
}</span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>然后进行实际的读写操作。如果是写命令(<span
lang=EN-US>WRITE</span>),则将请求项中缓冲区的内容复制到地址</p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // addr</span>处,长度为<span
lang=EN-US>len</span>字节。如果是读命令(<span lang=EN-US>READ</span>),则将<span
lang=EN-US>addr</span>开始的内存内容复制到请求项</p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>缓冲区中,长度为<span
lang=EN-US>len</span>字节。否则显示命令不存在,死机。</p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>35</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
if (<u><span style='color:blue'>CURRENT</span></u>-&gt; cmd == <u><span
style='color:blue'>WRITE</span></u>) {</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>36</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
(void ) <u><span style='color:blue'>memcpy</span></u>(addr,</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>37</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
<u><span style='color:blue'>CURRENT</span></u>-&gt;buffer,</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>38</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
len);</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>39</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
} else if (<u><span style='color:blue'>CURRENT</span></u>-&gt;cmd == <u><span
style='color:blue'>READ</span></u>) {</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>40</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
(void) <u><span style='color:blue'>memcpy</span></u>(<u><span style='color:
blue'>CURRENT</span></u>-&gt;buffer, </span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>41</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
addr,</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>42</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
len);</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>43</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
} else</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>44</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<u><span style='color:blue'>panic</span></u>(<i>&quot;unknown
ramdisk-command&quot;</i>);</span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>然后在请求项成功后处理,置更新标志。并继续处理本设备的下一请求项。</p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>45</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
<u><span style='color:blue'>end_request</span></u>(1);</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>46</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
goto repeat;</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>47</span></u> }</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>48</span></u> </span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>49</span></u> <b><i>/*</i></b></span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>50</span></u> <b><i>&nbsp;*
Returns amount of memory which needs to be reserved.</i></b></span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>51</span></u> <b><i>&nbsp;*/</i></b></span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; /* </span>返回内存虚拟盘<span
lang=EN-US>ramdisk</span>所需的内存量<span lang=EN-US> */</span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>虚拟盘初始化函数。</p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>该函数首先设置虚拟盘设备的请求项处理函数指针指向<span
lang=EN-US>do_rd_request()</span>,然后确定虚拟盘</p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>在物理内存中的起始地址、占用字节长度值。并对整个虚拟盘区清零。最后返回盘区长度。</p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><span lang=EN-US>linux/Makefile</span>文件中设置过<span
lang=EN-US>RAMDISK</span>值不为零时,表示系统中会创建<span lang=EN-US>RAM</span>虚拟盘设备。</p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>在这种情况下的内核初始化过程中,本函数就会被调用(<span
lang=EN-US>init/main.c</span><span lang=EN-US>L151</span>行)。该函数</p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>的第<span lang=EN-US>2</span>个参数<span
lang=EN-US>length</span>会被赋值成<span lang=EN-US>RAMDISK * 1024</span>,单位为字节。</p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>52</span></u>
long <u><span style='color:blue'>rd_init</span></u>(long mem_start, int length)</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>53</span></u> {</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>54</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
int&nbsp;&nbsp;&nbsp;&nbsp; i;</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>55</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
char&nbsp;&nbsp;&nbsp; *cp;</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>56</span></u> </span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>57</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
<u><span style='color:blue'>blk_dev</span></u>[<u><span style='color:blue'>MAJOR_NR</span></u>].request_fn
= <u><span style='color:blue'>DEVICE_REQUEST</span></u>;&nbsp; // do_rd_request()</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>58</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
<u><span style='color:blue'>rd_start</span></u> = (char *) mem_start;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;// </span>对于<span
lang=EN-US>16MB</span>系统该值为<span lang=EN-US>4MB</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>59</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
<u><span style='color:blue'>rd_length</span></u> = length;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
// </span>虚拟盘区域长度值。</p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>60</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
cp = <u><span style='color:blue'>rd_start</span></u>;</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>61</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
for (i=0; i &lt; length; i++)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
// </span>盘区清零。</p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>62</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
*cp++ = <i>'\0'</i>;</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>63</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
return(length);</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>64</span></u> }</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>65</span></u> </span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>66</span></u> <b><i>/*</i></b></span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>67</span></u> <b><i>&nbsp;*
If the root device is the ram disk, try to load it.</i></b></span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>68</span></u> <b><i>&nbsp;*
In order to do this, the root device is originally set to the</i></b></span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>69</span></u> <b><i>&nbsp;*
floppy, and we later change it to be ram disk.</i></b></span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>70</span></u> <b><i>&nbsp;*/</i></b></span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; /*</span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp; * </span>如果根文件系统设备<span
lang=EN-US>(root device)</span><span lang=EN-US>ramdisk</span>的话,则尝试加载它。</p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp; * root device</span>原先是指向软盘的,我们将它改成指向<span
lang=EN-US>ramdisk</span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp; */</span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; //// </span>尝试把根文件系统加载到虚拟盘中。</p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>该函数将在内核设置函数<span
lang=EN-US>setup()</span><span lang=EN-US>hd.c</span><span lang=EN-US>156</span>行)中被调用。另外,<span
lang=EN-US>1</span>磁盘块<span lang=EN-US> = 1024</span>字节。</p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><span lang=EN-US>75</span>行上的变量<span
lang=EN-US>block=256</span>表示根文件系统映像文件被存储于<span lang=EN-US>boot</span>盘第<span
lang=EN-US>256</span>磁盘块开始处。</p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>71</span></u>
void <u><span style='color:blue'>rd_load</span></u>(void)</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>72</span></u> {</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>73</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
struct <u><span style='color:blue'>buffer_head</span></u> *bh;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
// </span>高速缓冲块头指针。</p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>74</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
struct <u><span style='color:blue'>super_block</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
s;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; // </span>文件超级块结构。</p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>75</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
int&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
block = 256;&nbsp;&nbsp;&nbsp; <b><i>/* Start at block 256 */</i></b> /* </span>开始于<span
lang=EN-US>256</span>盘块<span lang=EN-US> */</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>76</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
int&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; i =
1;</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>77</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
int&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
nblocks;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; // </span>文件系统盘块总数。</p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>78</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
char&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
*cp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <b><i>/*
Move pointer */</i></b></span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>79</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>首先检查虚拟盘的有效性和完整性。如果<span
lang=EN-US>ramdisk</span>的长度为零,则退出。否则显示<span lang=EN-US>ramdisk</span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>的大小以及内存起始位置。如果此时根文件设备不是软盘设备,则也退出。</p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>80</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
if (!<u><span style='color:blue'>rd_length</span></u>)</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>81</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
return;</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>82</span></u>&nbsp;&nbsp;&nbsp;&nbsp;
&nbsp;&nbsp;&nbsp;&nbsp;<u><span style='color:blue'>printk</span></u>(<i>&quot;Ram
disk: %d bytes, starting at 0x%x\n&quot;</i>, <u><span style='color:blue'>rd_length</span></u>,</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>83</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
(int) <u><span style='color:blue'>rd_start</span></u>);</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>84</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
if (<u><span style='color:blue'>MAJOR</span></u>(<u><span style='color:blue'>ROOT_DEV</span></u>)
!= 2) </span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>85</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
return;</span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>然后读根文件系统的基本参数。即读软盘块<span
lang=EN-US>256+1</span><span lang=EN-US>256</span><span lang=EN-US>256+2</span>。这里<span
lang=EN-US>block+1</span>是指磁盘上</p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>的超级块。<span lang=EN-US>breada()
</span>用于读取指定的数据块,并标出还需要读的块,然后返回含有数据块的</p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>缓冲区指针。如果返回<span
lang=EN-US>NULL</span>,则表示数据块不可读(<span lang=EN-US>fs/buffer.c</span><span
lang=EN-US>322</span>)。然后把缓冲区中</p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>的磁盘超级块(<span
lang=EN-US>d_super_block</span>是磁盘超级块结构)复制到<span lang=EN-US>s</span>变量中,并释放缓冲区。
接着</p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>我们开始对超级块的有效性进行判断。 如果超级块中文件系统魔数不对,则说明加载的数据</p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>块不是<span lang=EN-US>MINIX</span>文件系统,于是退出。有关<span
lang=EN-US>MINIX</span>超级块的结构请参见文件系统一章内容。</p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>86</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
bh = <u><span style='color:blue'>breada</span></u>(<u><span style='color:blue'>ROOT_DEV</span></u>,block+1,block,block+2,-1);</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>87</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
if (!bh) {</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>88</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
<u><span style='color:blue'>printk</span></u>(<i>&quot;Disk error while looking
for ramdisk!\n&quot;</i>);</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>89</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
return;</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>90</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
}</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>91</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
*((struct <u><span style='color:blue'>d_super_block</span></u> *) &amp;s) =
*((struct <u><span style='color:blue'>d_super_block</span></u> *) bh-&gt;b_data);</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>92</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
<u><span style='color:blue'>brelse</span></u>(bh);</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>93</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
if (s.s_magic != <u><span style='color:blue'>SUPER_MAGIC</span></u>)</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>94</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
<b><i>/* No ram disk image present, assume normal floppy boot */</i></b></span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
/* </span>磁盘中没有<span lang=EN-US>ramdisk</span>映像文件,退出去执行通常的软盘引导 <span
lang=EN-US>*/</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>95</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
return;</span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>然后我们试图把整个根文件系统读入到内存虚拟盘区中。对于一个文件系统来说,其超级块</p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>结构的<span lang=EN-US>
s_nzones </span>字段中保存着总逻辑块数(或称为区段数)。一个逻辑块中含有的数据块</p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>数则由字段<span lang=EN-US>s_log_zone_size</span>指定。因此文件系统中的数据块总数<span
lang=EN-US>nblocks </span>就等于<span lang=EN-US> (</span>逻辑块</p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><span lang=EN-US> *
2^(</span>每区段块数的次方<span lang=EN-US>))</span>,即<span lang=EN-US>nblocks =
(s_nzones * 2^s_log_zone_size)</span>。如果遇到</p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>文件系统中数据块总数大于内存虚拟盘所能容纳的块数的情况,则不能执行加载操作,而只</p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>能显示出错信息并返回。</p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>96</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
nblocks = s.s_nzones &lt;&lt; s.s_log_zone_size;</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>97</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
if (nblocks &gt; (<u><span style='color:blue'>rd_length</span></u> &gt;&gt; <u><span
style='color:blue'>BLOCK_SIZE_BITS</span></u>)) {</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>98</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
<u><span style='color:blue'>printk</span></u>(<i>&quot;Ram disk image too
big!&nbsp; (%d blocks, %d avail)\n&quot;</i>, </span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>99</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
nblocks, <u><span style='color:blue'>rd_length</span></u> &gt;&gt; <u><span
style='color:blue'>BLOCK_SIZE_BITS</span></u>);</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>100</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
return;</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>101</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; }</span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>否则若虚拟盘能容纳得下文件系统总数据块数,则我们显示加载数据块信息,并让<span
lang=EN-US>cp</span>指向</p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>内存虚拟盘起始处,然后开始执行循环操作将磁盘上根文件系统映像文件加载到虚拟盘上。</p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>在操作过程中,如果一次需要加载的盘块数大于<span
lang=EN-US>2</span>块,我们就是用超前预读函数<span lang=EN-US>breada()</span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>否则就使用<span lang=EN-US>bread()</span>函数进行单块读取。若在读盘过程中出现<span
lang=EN-US>I/O</span>操作错误,就只能放弃加</p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>载过程返回。所读取的磁盘块会使用<span
lang=EN-US>memcpy()</span>函数从高速缓冲区中复制到内存虚拟盘相应</p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>位置处,同时显示已加载的块数。显示字符串中的八进制数<span
lang=EN-US>'\010'</span>表示显示一个制表符。</p>
<p class=a><u><span lang=EN-US style='color:blue'>102</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <u><span
style='color:blue'>printk</span></u>(<i>&quot;Loading %d bytes into ram disk...
0000k&quot;</i>, </span></p>
<p class=a><u><span lang=EN-US style='color:blue'>103</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
nblocks &lt;&lt; <u><span style='color:blue'>BLOCK_SIZE_BITS</span></u>);</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>104</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; cp = <u><span
style='color:blue'>rd_start</span></u>;</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>105</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; while (nblocks) {</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>106</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
if (nblocks &gt; 2) &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;//
</span>若读取块数多于<span lang=EN-US>2</span>块则采用超前预读。</p>
<p class=a><u><span lang=EN-US style='color:blue'>107</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
bh = <u><span style='color:blue'>breada</span></u>(<u><span style='color:blue'>ROOT_DEV</span></u>,
block, block+1, block+2, -1);</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>108</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
else&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
// </span>否则就单块读取。</p>
<p class=a><u><span lang=EN-US style='color:blue'>109</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
bh = <u><span style='color:blue'>bread</span></u>(<u><span style='color:blue'>ROOT_DEV</span></u>,
block);</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>110</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
if (!bh) {</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>111</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
<u><span style='color:blue'>printk</span></u>(<i>&quot;I/O error on block %d,
aborting load\n&quot;</i>, </span></p>
<p class=a><u><span lang=EN-US style='color:blue'>112</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
block);</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>113</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
return;</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>114</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;}</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>115</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
(void) <u><span style='color:blue'>memcpy</span></u>(cp, bh-&gt;b_data, <u><span
style='color:blue'>BLOCK_SIZE</span></u>);&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
// </span>复制到<span lang=EN-US>cp</span>处。</p>
<p class=a><u><span lang=EN-US style='color:blue'>116</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
<u><span style='color:blue'>brelse</span></u>(bh);</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>117</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
<u><span style='color:blue'>printk</span></u>(<i>&quot;\010\010\010\010\010%4dk&quot;</i>,i);&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
// </span>打印加载块计数值。</p>
<p class=a><u><span lang=EN-US style='color:blue'>118</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
cp += <u><span style='color:blue'>BLOCK_SIZE</span></u>;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;// </span>虚拟盘指针前移。</p>
<p class=a><u><span lang=EN-US style='color:blue'>119</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
block++;</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>120</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
nblocks--;</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>121</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
i++;</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>122</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; }</span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><span lang=EN-US>boot</span>盘中从<span
lang=EN-US>256</span>盘块开始的整个根文件系统加载完毕后,我们显示“<span lang=EN-US>done</span>”,并把目前</p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>根文件设备号修改成虚拟盘的设备号<span
lang=EN-US>0x0101</span>,最后返回。</p>
<p class=a><u><span lang=EN-US style='color:blue'>123</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <u><span
style='color:blue'>printk</span></u>(<i>&quot;\010\010\010\010\010done \n&quot;</i>);</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>124</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <u><span
style='color:blue'>ROOT_DEV</span></u>=0x0101;</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>125</span></u><span
lang=EN-US> }</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>126</span></u><span
lang=EN-US> </span></p>
<div class=a align=center style='text-align:center'><span lang=EN-US>
<hr size=4 width="100%" align=center>
</span></div>
<p class=MsoNormal><span lang=EN-US>&nbsp;</span></p>
<p class=MsoNormal><span lang=EN-US>&nbsp;</span></p>
</div>
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