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<p class=ab><a name="_Toc53320637"><span style='font-family:黑体'>程序</span><span
lang=EN-US>12-8 linux/fs/block_dev.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/fs/block_dev.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;
(C) 1991&nbsp; Linus Torvalds</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; <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;errno.h&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; // </span>错误号头文件。包含系统中各种出错号。</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/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'>10</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形定义。</p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>11</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'>12</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>中断门等的嵌入式汇编宏。</p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>13</span></u> </span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>设备数据块总数指针数组。每个指针项指向指定主设备号的总块数数组<span
lang=EN-US>hd_sizes[]</span>。该总</p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>块数数组每一项对应子设备号确定的一个子设备上所拥有的数据块总数(<span
lang=EN-US>1</span>块大小<span lang=EN-US> = 1KB</span>)。</p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>14</span></u>
extern int *<u><span style='color:blue'>blk_size</span></u>[];&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
// blk_drv/ll_rw_blk.c</span><span lang=EN-US>49</span>行。</p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>15</span></u> </span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; //// </span>数据块写函数<span
lang=EN-US> - </span>向指定设备从给定偏移处写入指定长度数据。</p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>参数:<span lang=EN-US>dev
- </span>设备号;<span lang=EN-US>pos - </span>设备文件中偏移量指针;<span lang=EN-US>buf - </span>用户空间中缓冲区地址;</p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // count - </span>要传送的字节数。</p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>返回已写入字节数。若没有写入任何字节或出错,则返回出错号。</p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>对于内核来说,写操作是向高速缓冲区中写入数据。什么时候数据最终写入设备是由高速缓</p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>冲管理程序决定并处理的。另外,因为块设备是以块为单位进行读写,因此对于写开始位置</p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>不处于块起始处时,需要先将开始字节所在的整个块读出,然后将需要写的数据从写开始处</p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>填写满该块,再将完整的一块数据写盘(即交由高速缓冲程序去处理)。</p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>16</span></u> int
<u><span style='color:blue'>block_write</span></u>(int dev, long * <u><span
style='color:blue'>pos</span></u>, char * <u><span style='color:blue'>buf</span></u>,
int <u><span style='color:blue'>count</span></u>)</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>17</span></u> {</span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>首先由文件中位置<span
lang=EN-US>pos</span>换算成开始读写盘块的块序号<span lang=EN-US>block</span>,并求出需写第<span
lang=EN-US>1</span>字节在该块中</p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>的偏移位置<span lang=EN-US>offset</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>18</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
int block = *<u><span style='color:blue'>pos</span></u> &gt;&gt; <u><span
style='color:blue'>BLOCK_SIZE_BITS</span></u>;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
// pos</span>所在文件数据块号。</p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>19</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
int offset = *<u><span style='color:blue'>pos</span></u> &amp; (<u><span
style='color:blue'>BLOCK_SIZE</span></u>-1);&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
// pos</span>在数据块中偏移值。</p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>20</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
int chars;</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>21</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
int written = 0;</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>22</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
int size;</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>23</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
struct <u><span style='color:blue'>buffer_head</span></u> * bh;</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>24</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
register char * p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;// </span>局部寄存器变量,被存放在寄存器中。</p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>25</span></u> </span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>在写一个块设备文件时,要求写的总数据块数当然不能超过指定设备上容许的最大数据块总</p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>数。因此这里首先取出指定设备的块总数<span
lang=EN-US>size</span>来比较和限制函数参数给定的写入数据长度。</p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>如果系统中没有对设备指定长度,就使用默认长度<span
lang=EN-US>0x7fffffff</span><span lang=EN-US>2GB</span>个块)。</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;
if (<u><span style='color:blue'>blk_size</span></u>[<u><span style='color:blue'>MAJOR</span></u>(dev)])</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>27</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
size = <u><span style='color:blue'>blk_size</span></u>[<u><span
style='color:blue'>MAJOR</span></u>(dev)][<u><span style='color:blue'>MINOR</span></u>(dev)];</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;
else</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;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
size = 0x7fffffff;</span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>然后针对要写入的字节数<span
lang=EN-US>count</span>,循环执行以下操作,直到数据全部写入。在循环执行过程</p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>中,若当前写入数据的块号已经大于或等于指定设备的总块数,则返回已写字节数并退出。</p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>然后再计算在当前处理的数据块中可写入的字节数。如果需要写入的字节数填不满一块,那</p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>么就只需写<span lang=EN-US>count</span>字节。如果正好要写<span
lang=EN-US>1</span>块数据内容,则直接申请<span lang=EN-US>1</span>块高速缓冲块,并把用</p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>户数据放入即可。否则就需要读入将被写入部分数据的数据块,并预读下两块数据。然后将</p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>块号递增<span lang=EN-US>
1</span>,为下次操作做好准备。如果缓冲块操作失败,则返回已写字节数,如果没有写</p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>入任何字节,则返回出错号(负数)。</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;
while (<u><span style='color:blue'>count</span></u>&gt;0) {</span></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;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
if (block &gt;= size)</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;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
return written?written:-<u><span style='color:blue'>EIO</span></u>;</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;
chars = <u><span style='color:blue'>BLOCK_SIZE</span></u> - offset;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
// </span>本块可写入的字节数。</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;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
if (chars &gt; <u><span style='color:blue'>count</span></u>)</span></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;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
chars=<u><span style='color:blue'>count</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;
if (chars == <u><span style='color:blue'>BLOCK_SIZE</span></u>)</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;
bh = <u><span style='color:blue'>getblk</span></u>(dev,block);&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
// buffer.c </span><span lang=EN-US>206</span><span lang=EN-US>322</span>行。</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;
else</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;&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>(dev,block,block+1,block+2,-1);</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;
block++;</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;
if (!bh)</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;
return written?written:-<u><span style='color:blue'>EIO</span></u>;</span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>接着先把指针<span
lang=EN-US>p</span>指向读出数据的缓冲块中开始写入数据的位置处。若最后一次循环写入的数</p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>据不足一块,则需从块开始处填写(修改)所需的字节,因此这里需预先设置<span
lang=EN-US>offset</span>为零。</p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>此后将文件中偏移指针<span
lang=EN-US>pos</span>前移此次将要写的字节数<span lang=EN-US>chars</span>,并累加这些要写的字节数到统</p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>计值<span lang=EN-US>written</span>中。再把还需要写的计数值<span
lang=EN-US>count </span>减去此次要写的字节数<span lang=EN-US>chars</span>。然后我们从</p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>用户缓冲区复制<span
lang=EN-US>chars</span>个字节到<span lang=EN-US>p</span>指向的高速缓冲块中开始写入的位置处。复制完后就设置</p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>该缓冲区块已修改标志,并释放该缓冲区(也即该缓冲区引用计数递减<span
lang=EN-US>1</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;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
p = offset + bh-&gt;b_data;</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;
offset = 0;</span></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;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
*<u><span style='color:blue'>pos</span></u> += chars;</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;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
written += chars;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
// </span>累计写入字节数。</p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>47</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
<u><span style='color:blue'>count</span></u> -= chars;</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>48</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
while (chars--&gt;0)</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>49</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;
*(p++) = <u><span style='color:blue'>get_fs_byte</span></u>(<u><span
style='color:blue'>buf</span></u>++);</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>50</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
bh-&gt;b_dirt = 1;</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>51</span></u>&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><span lang=EN-US>&nbsp;<u><span style='color:blue'>52</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'>53</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
return written;&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>返回已写入的字节数,正常退出。</p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>54</span></u> }</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>55</span></u> </span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; //// </span>数据块读函数<span
lang=EN-US> - </span>从指定设备和位置处读入指定长度数据到用户缓冲区中。</p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>参数:<span lang=EN-US>dev
- </span>设备号;<span lang=EN-US>pos - </span>设备文件中偏移量指针;<span lang=EN-US>buf - </span>用户空间中缓冲区地址;</p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // count - </span>要传送的字节数。</p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>返回已读入字节数。若没有读入任何字节或出错,则返回出错号。</p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>56</span></u> int
<u><span style='color:blue'>block_read</span></u>(int dev, unsigned long * <u><span
style='color:blue'>pos</span></u>, char * <u><span style='color:blue'>buf</span></u>,
int <u><span style='color:blue'>count</span></u>)</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>57</span></u> {</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;
int block = *<u><span style='color:blue'>pos</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'>59</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
int offset = *<u><span style='color:blue'>pos</span></u> &amp; (<u><span
style='color:blue'>BLOCK_SIZE</span></u>-1);</span></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;
int chars;</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;
int size;</span></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;
int <u><span style='color:blue'>read</span></u> = 0;</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;
struct <u><span style='color:blue'>buffer_head</span></u> * bh;</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>64</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
register char * p;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;//
</span>局部寄存器变量,被存放在寄存器中。</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;&nbsp;&nbsp; // </span>在读一个块设备文件时,要求读的总数据块数当然不能超过指定设备上容许的最大数据块总</p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>数。因此这里首先取出指定设备的块总数<span
lang=EN-US>size</span>来比较和限制函数参数给定的读入数据长度。</p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>如果系统中没有对设备指定长度,就使用默认长度<span
lang=EN-US>0x7fffffff</span><span lang=EN-US>2GB</span>个块)。</p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>66</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
if (<u><span style='color:blue'>blk_size</span></u>[<u><span style='color:blue'>MAJOR</span></u>(dev)])</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>67</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
size = <u><span style='color:blue'>blk_size</span></u>[<u><span
style='color:blue'>MAJOR</span></u>(dev)][<u><span style='color:blue'>MINOR</span></u>(dev)];</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>68</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'>69</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
size = 0x7fffffff;</span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>然后针对要读入的字节数<span
lang=EN-US>count</span>,循环执行以下操作,直到数据全部读入。在循环执行过程</p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>中,若当前读入数据的块号已经大于或等于指定设备的总块数,则返回已读字节数并退出。</p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>然后再计算在当前处理的数据块中需读入的字节数。如果需要读入的字节数还不满一块,那</p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>么就只需读<span lang=EN-US>count</span>字节。然后调用读块函数<span
lang=EN-US>breada()</span>读入需要的数据块,并预读下两块数据,</p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>如果读操作出错,则返回已读字节数,如果没有读入任何字节,则返回出错号。然后将块号</p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>递增<span lang=EN-US>1</span>。为下次操作做好准备。如果缓冲块操作失败,则返回已写字节数,如果没有读入任</p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>何字节,则返回出错号(负数)。</p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>70</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
while (<u><span style='color:blue'>count</span></u>&gt;0) {</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>71</span></u> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;if
(block &gt;= size)</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>72</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;
return <u><span style='color:blue'>read</span></u>?<u><span style='color:blue'>read</span></u>:-<u><span
style='color:blue'>EIO</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;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
chars = <u><span style='color:blue'>BLOCK_SIZE</span></u>-offset;</span></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;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
if (chars &gt; <u><span style='color:blue'>count</span></u>)</span></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;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
chars = <u><span style='color:blue'>count</span></u>;</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;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
if (!(bh = <u><span style='color:blue'>breada</span></u>(dev,block,block+1,block+2,-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;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
return <u><span style='color:blue'>read</span></u>?<u><span style='color:blue'>read</span></u>:-<u><span
style='color:blue'>EIO</span></u>;</span></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;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
block++;</span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>接着先把指针<span
lang=EN-US>p</span>指向读出盘块的缓冲块中开始读入数据的位置处。若最后一次循环读操作的</p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>数据不足一块,则需从块起始处读取所需字节,因此这里需预先设置<span
lang=EN-US>offset</span>为零。 此后将</p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>文件中偏移指针<span
lang=EN-US>pos</span>前移此次将要读的字节数<span lang=EN-US>chars</span>,并且累加这些要读的字节数到统计值</p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // read</span>中。再把还需要读的计数值<span
lang=EN-US>count</span>减去此次要读的字节数<span lang=EN-US>chars</span>。然后我们从高速缓冲</p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>块中<span lang=EN-US>p</span>指向的开始读的位置处复制<span
lang=EN-US>chars</span>个字节到用户缓冲区中,同时把用户缓冲区指针前</p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>移。本次复制完后就释放该缓冲块。</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;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
p = offset + bh-&gt;b_data;</span></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;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
offset = 0;</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;
*<u><span style='color:blue'>pos</span></u> += chars;</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;&nbsp;
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<u><span style='color:blue'>read</span></u>
+= chars;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
// </span>累计读入字节数。</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;
<u><span style='color:blue'>count</span></u> -= chars;</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;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
while (chars--&gt;0)</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;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
<u><span style='color:blue'>put_fs_byte</span></u>(*(p++),<u><span
style='color:blue'>buf</span></u>++);</span></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;&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'>87</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'>88</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
return <u><span style='color:blue'>read</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;//
</span>返回已读取的字节数,正常退出。</p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>89</span></u> }</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>90</span></u> </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>
</body>
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