2696 lines
100 KiB
HTML
2696 lines
100 KiB
HTML
<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
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<meta name=Generator content="Microsoft Word 14 (filtered)">
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<style>
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p
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pre
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tt
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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{mso-style-name:"图中文字小5号 Char2";
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|
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{mso-style-name:"图中文字3 Char Char Char Char";
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|
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|
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|
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p.post3, li.post3, div.post3
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{mso-style-name:邮件post3;
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|
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|
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|
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|
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|
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|
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{mso-style-name:列表8;
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|
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{mso-style-name:图说明10;
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|
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{mso-style-name:图说明13;
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|
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|
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{mso-style-name:附录3;
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|
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|
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|
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|
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|
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|
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{mso-style-name:索引标题1;
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|
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|
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|
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|
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|
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{mso-style-name:"图说明14 Char";
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|
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|
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|
||
{mso-style-name:"批注文字 Char";
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|
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|
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|
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{mso-style-name:"页脚 Char";
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|
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|
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{mso-style-name:"日期 Char";
|
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mso-style-link:日期;
|
||
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|
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|
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|
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|
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|
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|
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|
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/* Page Definitions */
|
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@page WordSection1
|
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{size:595.3pt 841.9pt;
|
||
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|
||
layout-grid:15.6pt;}
|
||
div.WordSection1
|
||
{page:WordSection1;}
|
||
/* List Definitions */
|
||
ol
|
||
{margin-bottom:0cm;}
|
||
ul
|
||
{margin-bottom:0cm;}
|
||
-->
|
||
</style>
|
||
|
||
</head>
|
||
|
||
<body lang=ZH-CN link=blue vlink=purple style='text-justify-trim:punctuation'>
|
||
|
||
<div class=WordSection1 style='layout-grid:15.6pt'>
|
||
|
||
<p class=ab><a name="_Toc53320634"><span style='font-family:黑体'>程序</span> <span
|
||
lang=EN-US>12-2 linux/fs/bitmap.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> <u><span style='color:blue'>1</span></u> <b><i>/*</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>2</span></u> <b><i> *
|
||
linux/fs/bitmap.c</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>3</span></u> <b><i> *</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>4</span></u> <b><i> *
|
||
(C) 1991 Linus Torvalds</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>5</span></u> <b><i> */</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>6</span></u> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>7</span></u> <b><i>/*
|
||
bitmap.c contains the code that handles the inode and block bitmaps */</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> /* bitmap.c</span>程序含有处理<span
|
||
lang=EN-US>i</span>节点和磁盘块位图的代码<span lang=EN-US> */</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>8</span></u>
|
||
#include <string.h> // </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> <u><span style='color:blue'>9</span></u> //
|
||
</span>这里使用了其中的<span lang=EN-US>memset()</span>函数。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>10</span></u>
|
||
#include <linux/sched.h> // </span>调度程序头文件，定义任务结构<span lang=EN-US>task_struct</span>、任务<span
|
||
lang=EN-US>0</span>数据。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>11</span></u>
|
||
#include <linux/kernel.h> // </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> <u><span style='color:blue'>12</span></u> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> //// </span>将指定地址（<span
|
||
lang=EN-US>addr</span>）处的一块<span lang=EN-US>1024</span>字节内存清零。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>输入：<span lang=EN-US>eax
|
||
= 0</span>；<span lang=EN-US>ecx = </span>以长字为单位的数据块长度（<span lang=EN-US>BLOCK_SIZE/4</span>）；<span
|
||
lang=EN-US>edi = </span>指定起始地</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>址<span lang=EN-US>addr</span>。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>13</span></u>
|
||
#define <u><span style='color:blue'>clear_block</span></u>(addr) \</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>14</span></u>
|
||
__asm__(<i>"cld\n\t"</i> \
|
||
// </span>清方向位。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>15</span></u>
|
||
<i>"rep\n\t"</i> \
|
||
// </span>重复执行存储数据（<span lang=EN-US>0</span>）。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>16</span></u>
|
||
<i>"stosl"</i> \</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>17</span></u>
|
||
::<i>"a"</i> (0),<i>"c"</i> (<u><span style='color:blue'>BLOCK_SIZE</span></u>/4),<i>"D"</i>
|
||
((long) (addr)):<i>"cx"</i>,<i>"di"</i>)</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>18</span></u> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> //// </span>把指定地址开始的第<span
|
||
lang=EN-US>nr</span>个位偏移处的比特位置位（<span lang=EN-US>nr</span>可大于<span lang=EN-US>32</span>！）。返回原比特位值。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>输入：<span lang=EN-US>%0
|
||
-eax</span>（返回值）；<span lang=EN-US>%1 -eax(0)</span>；<span lang=EN-US>%2 -nr</span>，位偏移值；<span
|
||
lang=EN-US>%3 -(addr)</span>，<span lang=EN-US>addr</span>的内容。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>第<span lang=EN-US>20</span>行定义了一个局部寄存器变量<span
|
||
lang=EN-US>res</span>。该变量将被保存在指定的<span lang=EN-US>eax</span>寄存器中，以便于</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>高效访问和操作。这种定义变量的方法主要用于内嵌汇编程序中。详细说明参见<span
|
||
lang=EN-US>gcc</span>手册</p>
|
||
|
||
<p class=a><span lang=EN-US> // “</span>在指定寄存器中的变量<span
|
||
lang=EN-US>”</span>。整个宏定义是一个语句表达式，该表达式值是最后<span lang=EN-US>res</span>的值。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>第<span lang=EN-US>21</span>行上的<span
|
||
lang=EN-US>btsl</span>指令用于测试并设置比特位（<span lang=EN-US>Bit Test and Set</span>）。把基地址（<span
|
||
lang=EN-US>%3</span>）和</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>比特位偏移值（<span
|
||
lang=EN-US>%2</span>）所指定的比特位值先保存到进位标志<span lang=EN-US>CF</span>中，然后设置该比特位为<span
|
||
lang=EN-US>1</span>。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>指令<span lang=EN-US>setb</span>用于根据进位标志<span
|
||
lang=EN-US>CF</span>设置操作数（<span lang=EN-US>%al</span>）。如果<span lang=EN-US>CF=1</span>则<span
|
||
lang=EN-US>%al =1</span>，否则<span lang=EN-US>%al =0</span>。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>19</span></u>
|
||
#define <u><span style='color:blue'>set_bit</span></u>(nr,addr) ({\</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>20</span></u>
|
||
register int res __asm__(<i>"ax"</i>); \</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>21</span></u>
|
||
__asm__ __volatile__(<i>"btsl %2,%3\n\tsetb %%al"</i>: \</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>22</span></u> <i>"=a"</i>
|
||
(res):<i>""</i> (0),<i>"r"</i> (nr),<i>"m"</i>
|
||
(*(addr))); \</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>23</span></u>
|
||
res;})</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>24</span></u> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> //// </span>复位指定地址开始的第<span
|
||
lang=EN-US>nr</span>位偏移处的比特位。返回原比特位值的反码。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>输入：<span lang=EN-US>%0
|
||
-eax</span>（返回值）；<span lang=EN-US>%1 -eax(0)</span>；<span lang=EN-US>%2 -nr</span>，位偏移值；<span
|
||
lang=EN-US>%3 -(addr)</span>，<span lang=EN-US>addr</span>的内容。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>第<span lang=EN-US>27</span>行上的<span
|
||
lang=EN-US>btrl</span>指令用于测试并复位比特位（<span lang=EN-US>Bit Test and Reset</span>）。其作用与上面的</p>
|
||
|
||
<p class=a><span lang=EN-US> // btsl</span>类似，但是复位指定比特位。指令<span
|
||
lang=EN-US>setnb</span>用于根据进位标志<span lang=EN-US>CF</span>设置操作数（<span
|
||
lang=EN-US>%al</span>）。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>如果<span lang=EN-US>CF
|
||
= 1</span>则<span lang=EN-US>%al = 0</span>，否则<span lang=EN-US>%al = 1</span>。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>25</span></u>
|
||
#define <u><span style='color:blue'>clear_bit</span></u>(nr,addr) ({\</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>26</span></u>
|
||
register int res __asm__(<i>"ax"</i>); \</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>27</span></u>
|
||
__asm__ __volatile__(<i>"btrl %2,%3\n\tsetnb %%al"</i>: \</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>28</span></u> <i>"=a"</i>
|
||
(res):<i>""</i> (0),<i>"r"</i> (nr),<i>"m"</i>
|
||
(*(addr))); \</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>29</span></u>
|
||
res;})</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>30</span></u> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> //// </span>从<span lang=EN-US>addr</span>开始寻找第<span
|
||
lang=EN-US>1</span>个<span lang=EN-US>0</span>值比特位。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>输入：<span lang=EN-US>%0
|
||
- ecx(</span>返回值<span lang=EN-US>)</span>；<span lang=EN-US>%1 - ecx(0)</span>；<span
|
||
lang=EN-US>%2 - esi(addr)</span>。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>在<span lang=EN-US>addr</span>指定地址开始的位图中寻找第<span
|
||
lang=EN-US>1</span>个是<span lang=EN-US>0</span>的比特位，并将其距离<span lang=EN-US>addr</span>的比特位偏移</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>值返回。<span lang=EN-US>addr</span>是缓冲块数据区的地址，扫描寻找的范围是<span
|
||
lang=EN-US>1024</span>字节（<span lang=EN-US>8192</span>比特位）。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>31</span></u>
|
||
#define <u><span style='color:blue'>find_first_zero</span></u>(addr) ({ \</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>32</span></u> int
|
||
__res; \</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>33</span></u>
|
||
__asm__(<i>"cld\n"</i> \
|
||
// </span>清方向位。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>34</span></u>
|
||
<i>"1:\tlodsl\n\t"</i> \
|
||
// </span>取<span lang=EN-US>[esi]</span><span lang=EN-US style='font-family:
|
||
Wingdings'>è</span><span lang=EN-US>eax</span>。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>35</span></u>
|
||
<i>"notl %%eax\n\t"</i> \
|
||
// eax</span>中每位取反。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>36</span></u>
|
||
<i>"bsfl %%eax,%%edx\n\t"</i> \ // </span>从位<span
|
||
lang=EN-US>0</span>扫描<span lang=EN-US>eax</span>中是<span lang=EN-US>1</span>的第<span
|
||
lang=EN-US>1</span>个位，其偏移值<span lang=EN-US style='font-family:Wingdings'>è</span><span
|
||
lang=EN-US>edx</span>。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>37</span></u>
|
||
<i>"je 2f\n\t"</i> \ // </span>如果<span lang=EN-US>eax</span>中全是<span
|
||
lang=EN-US>0</span>，则向前跳转到标号<span lang=EN-US>2</span>处<span lang=EN-US>(40</span>行<span
|
||
lang=EN-US>)</span>。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>38</span></u>
|
||
<i>"addl %%edx,%%ecx\n\t"</i> \ // </span>偏移值加入<span
|
||
lang=EN-US>ecx</span>（<span lang=EN-US>ecx</span>是位图首个<span lang=EN-US>0</span>值位的偏移值）。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>39</span></u>
|
||
<i>"jmp 3f\n"</i> \ // </span>向前跳转到标号<span
|
||
lang=EN-US>3</span>处（结束）。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>40</span></u>
|
||
<i>"2:\taddl $32,%%ecx\n\t"</i> \ // </span>未找到<span
|
||
lang=EN-US>0</span>值位，则将<span lang=EN-US>ecx</span>加<span lang=EN-US>1</span>个长字的位偏移量<span
|
||
lang=EN-US>32</span>。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>41</span></u>
|
||
<i>"cmpl $8192,%%ecx\n\t"</i> \ // </span>已经扫描了<span
|
||
lang=EN-US>8192</span>比特位（<span lang=EN-US>1024</span>字节）了吗？</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>42</span></u>
|
||
<i>"jl 1b\n"</i> \
|
||
// </span>若还没有扫描完<span lang=EN-US>1</span>块数据，则向前跳转到标号<span lang=EN-US>1</span>处。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>43</span></u>
|
||
<i>"3:"</i> \
|
||
// </span>结束。此时<span lang=EN-US>ecx</span>中是位偏移量。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>44</span></u>
|
||
:<i>"=c"</i> (__res):<i>"c"</i> (0),<i>"S"</i>
|
||
(addr):<i>"ax"</i>,<i>"dx"</i>,<i>"si"</i>); \</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>45</span></u>
|
||
__res;})</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>46</span></u> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> //// </span>释放设备<span
|
||
lang=EN-US>dev</span>上数据区中的逻辑块<span lang=EN-US>block</span>。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>复位指定逻辑块<span
|
||
lang=EN-US>block</span>对应的逻辑块位图比特位。成功则返回<span lang=EN-US>1</span>，否则返回<span
|
||
lang=EN-US>0</span>。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>参数：<span lang=EN-US>dev</span>是设备号，<span
|
||
lang=EN-US>block</span>是逻辑块号（盘块号）。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>47</span></u> int
|
||
<u><span style='color:blue'>free_block</span></u>(int dev, int block)</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>48</span></u> {</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>49</span></u>
|
||
struct <u><span style='color:blue'>super_block</span></u> * sb;</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>50</span></u>
|
||
struct <u><span style='color:blue'>buffer_head</span></u> * bh;</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>51</span></u> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>首先取设备<span lang=EN-US>dev</span>上文件系统的超级块信息，根据其中数据区开始逻辑块号和文件系统中逻辑</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>块总数信息判断参数<span
|
||
lang=EN-US>block</span>的有效性。如果指定设备超级块不存在，则出错停机。若逻辑块</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>号小于盘上数据区第<span
|
||
lang=EN-US>1</span>个逻辑块的块号或者大于设备上总逻辑块数，也出错停机。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>52</span></u>
|
||
if (!(sb = <u><span style='color:blue'>get_super</span></u>(dev)))
|
||
// fs/super.c</span>，第<span
|
||
lang=EN-US>56</span>行。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>53</span></u>
|
||
<u><span style='color:blue'>panic</span></u>(<i>"trying to free block on
|
||
nonexistent device"</i>);</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>54</span></u>
|
||
if (block < sb->s_firstdatazone || block >= sb->s_nzones)</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>55</span></u>
|
||
<u><span style='color:blue'>panic</span></u>(<i>"trying to free block not
|
||
in datazone"</i>);</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>56</span></u>
|
||
bh = <u><span style='color:blue'>get_hash_table</span></u>(dev,block);</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>然后从 <span lang=EN-US>hash</span>表中寻找该块数据。若找到了则判断其有效性，并清已修改和更新标志，释放</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>该数据块。该段代码的主要用途是如果该逻辑块目前存在于高速缓冲区中，就释放对应的缓</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>冲块。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>57</span></u>
|
||
if (bh) {</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>58</span></u>
|
||
if (bh->b_count > 1) { // </span>如果引用次数大于<span
|
||
lang=EN-US>1</span>，则调用<span lang=EN-US>brelse()</span>，</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>59</span></u>
|
||
<u><span style='color:blue'>brelse</span></u>(bh); //
|
||
b_count--</span>后即退出，该块还有人用。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>60</span></u>
|
||
return 0;</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>61</span></u>
|
||
}</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>62</span></u>
|
||
bh->b_dirt=0; //
|
||
</span>否则复位已修改和已更新标志。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>63</span></u>
|
||
bh->b_uptodate=0;</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>64</span></u>
|
||
if (bh->b_count) //
|
||
</span>若此时<span lang=EN-US>b_count</span>为<span lang=EN-US>1</span>，则调用<span
|
||
lang=EN-US>brelse()</span>释放之。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>65</span></u>
|
||
<u><span style='color:blue'>brelse</span></u>(bh);</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>66</span></u>
|
||
}</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>接着我们复位<span
|
||
lang=EN-US>block</span>在逻辑块位图中的比特位（置<span lang=EN-US>0</span>）。先计算<span
|
||
lang=EN-US>block</span>在数据区开始算起的</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>数据逻辑块号（从<span
|
||
lang=EN-US>1</span>开始计数）。然后对逻辑块<span lang=EN-US>(</span>区块<span lang=EN-US>)</span>位图进行操作，复位对应的比特位。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>如果对应比特位原来就是<span
|
||
lang=EN-US>0</span>，则出错停机。由于<span lang=EN-US>1</span>个缓冲块有<span lang=EN-US>1024</span>字节，即<span
|
||
lang=EN-US>8192</span>比特位，</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>因此 <span lang=EN-US>block/8192
|
||
</span>即可计算出指定块 <span lang=EN-US>block </span>在逻辑位图中的哪个块上。而 <span lang=EN-US>block&8191
|
||
</span>可</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>以得到<span lang=EN-US>block</span>在逻辑块位图当前块中的比特偏移位置。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>67</span></u>
|
||
block -= sb->s_firstdatazone - 1 ; // </span>即<span lang=EN-US>block = block
|
||
- ( s_firstdatazone -1);</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>68</span></u>
|
||
if (<u><span style='color:blue'>clear_bit</span></u>(block&8191,sb->s_zmap[block/8192]->b_data))
|
||
{</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>69</span></u>
|
||
<u><span style='color:blue'>printk</span></u>(<i>"block (%04x:%d) "</i>,dev,block+sb->s_firstdatazone-1);</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>70</span></u>
|
||
<u><span style='color:blue'>printk</span></u>(<i>"free_block: bit already
|
||
cleared\n"</i>);</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>71</span></u>
|
||
}</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>最后置相应逻辑块位图所在缓冲区已修改标志。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>72</span></u>
|
||
sb->s_zmap[block/8192]->b_dirt = 1;</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>73</span></u>
|
||
return 1;</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>74</span></u> }</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>75</span></u> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> ////</span>向设备申请一个逻辑块（盘块，区块）。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>函数首先取得设备的超级块，并在超级块中的逻辑块位图中寻找第一个<span
|
||
lang=EN-US>0</span>值比特位（代表</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>一个空闲逻辑块）。然后置位对应逻辑块在逻辑块位图中的比特位。接着为该逻辑块在缓</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>冲区中取得一块对应缓冲块。最后将该缓冲块清零，并设置其已更新标志和已修改标志。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>并返回逻辑块号。函数执行成功则返回逻辑块号（盘块号），否则返回<span
|
||
lang=EN-US>0</span>。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>76</span></u> int
|
||
<u><span style='color:blue'>new_block</span></u>(int dev)</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>77</span></u> {</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>78</span></u>
|
||
struct <u><span style='color:blue'>buffer_head</span></u> * bh;</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>79</span></u>
|
||
struct <u><span style='color:blue'>super_block</span></u> * sb;</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>80</span></u>
|
||
int i,j;</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>81</span></u> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>首先获取设备<span
|
||
lang=EN-US>dev</span>的超级块。如果指定设备的超级块不存在，则出错停机。然后扫描文件</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>系统的<span lang=EN-US>8</span>块逻辑块位图，寻找首个<span
|
||
lang=EN-US>0</span>值比特位，以寻找空闲逻辑块，获取放置该逻辑块的</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>块号。 如果全部扫描完<span
|
||
lang=EN-US>8</span>块逻辑块位图的所有比特位（<span lang=EN-US>i >= 8 </span>或 <span
|
||
lang=EN-US>j >= 8192</span>）还没找到</p>
|
||
|
||
<p class=a><span lang=EN-US> // 0</span>值比特位或者位图所在的缓冲块指针无效<span
|
||
lang=EN-US>(bh = NULL)</span>则 返回<span lang=EN-US>0</span>退出（没有空闲逻辑块）。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>82</span></u>
|
||
if (!(sb = <u><span style='color:blue'>get_super</span></u>(dev)))</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>83</span></u>
|
||
<u><span style='color:blue'>panic</span></u>(<i>"trying to get new block
|
||
from nonexistant device"</i>);</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>84</span></u>
|
||
j = 8192;</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>85</span></u>
|
||
for (i=0 ; i<8 ; i++)</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>86</span></u>
|
||
if (bh=sb->s_zmap[i])</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>87</span></u>
|
||
if ((j=<u><span style='color:blue'>find_first_zero</span></u>(bh->b_data))<8192)</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>88</span></u>
|
||
break;</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>89</span></u>
|
||
if (i>=8 || !bh || j>=8192)</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>90</span></u>
|
||
return 0;</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>接着设置找到的新逻辑块<span
|
||
lang=EN-US>j</span>对应逻辑块位图中的比特位。若对应比特位已经置位，则出错</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>停机。否则置存放位图的对应缓冲区块已修改标志。因为逻辑块位图仅表示盘上数据区中</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>逻辑块的占用情况，即逻辑块位图中比特位偏移值表示从数据区开始处算起的块号，因此</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>这里需要加上数据区第<span
|
||
lang=EN-US>1</span>个逻辑块的块号，把<span lang=EN-US>j</span>转换成逻辑块号。此时如果新逻辑块大于</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>该设备上的总逻辑块数，则说明指定逻辑块在对应设备上不存在。申请失败，返回<span
|
||
lang=EN-US>0</span>退出。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>91</span></u>
|
||
if (<u><span style='color:blue'>set_bit</span></u>(j,bh->b_data))</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>92</span></u>
|
||
<u><span style='color:blue'>panic</span></u>(<i>"new_block: bit already
|
||
set"</i>);</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>93</span></u>
|
||
bh->b_dirt = 1;</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>94</span></u>
|
||
j += i*8192 + sb->s_firstdatazone-1;</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>95</span></u>
|
||
if (j >= sb->s_nzones)</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>96</span></u>
|
||
return 0;</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>然后在高速缓冲区中为该设备上指定的逻辑块号取得一个缓冲块，并返回缓冲块头指针。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>因为刚取得的逻辑块其引用次数一定为<span
|
||
lang=EN-US>1</span>（<span lang=EN-US>getblk()</span>中会设置），因此若不为<span
|
||
lang=EN-US>1</span>则停机。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>最后将新逻辑块清零，并设置其已更新标志和已修改标志。然后释放对应缓冲块，返回</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>逻辑块号。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>97</span></u>
|
||
if (!(bh=<u><span style='color:blue'>getblk</span></u>(dev,j)))</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>98</span></u>
|
||
<u><span style='color:blue'>panic</span></u>(<i>"new_block: cannot get
|
||
block"</i>);</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>99</span></u>
|
||
if (bh->b_count != 1)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>100</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>panic</span></u>(<i>"new block: count is != 1"</i>);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>101</span></u><span
|
||
lang=EN-US> <u><span
|
||
style='color:blue'>clear_block</span></u>(bh->b_data);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>102</span></u><span
|
||
lang=EN-US> bh->b_uptodate =
|
||
1;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>103</span></u><span
|
||
lang=EN-US> bh->b_dirt = 1;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>104</span></u><span
|
||
lang=EN-US> <u><span
|
||
style='color:blue'>brelse</span></u>(bh);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>105</span></u><span
|
||
lang=EN-US> return j;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>106</span></u><span
|
||
lang=EN-US> }</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>107</span></u><span
|
||
lang=EN-US> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> //// </span>释放指定的<span
|
||
lang=EN-US>i</span>节点。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>该函数首先判断参数给出的<span
|
||
lang=EN-US>i</span>节点号的有效性和可释放性。若<span lang=EN-US>i</span>节点仍然在使用中则不能</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>被释放。然后利用超级块信息对<span
|
||
lang=EN-US>i</span>节点位图进行操作，复位<span lang=EN-US>i</span>节点号对应的<span lang=EN-US>i</span>节点位图中</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>比特位，并清空<span
|
||
lang=EN-US>i</span>节点结构。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>108</span></u><span
|
||
lang=EN-US> void <u><span style='color:blue'>free_inode</span></u>(struct <u><span
|
||
style='color:blue'>m_inode</span></u> * inode)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>109</span></u><span
|
||
lang=EN-US> {</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>110</span></u><span
|
||
lang=EN-US> struct <u><span
|
||
style='color:blue'>super_block</span></u> * sb;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>111</span></u><span
|
||
lang=EN-US> struct <u><span
|
||
style='color:blue'>buffer_head</span></u> * bh;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>112</span></u><span
|
||
lang=EN-US> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>首先判断参数给出的需要释放的<span
|
||
lang=EN-US>i</span>节点有效性或合法性。如果<span lang=EN-US>i</span>节点指针<span lang=EN-US>=NULL</span>，则退出。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>如果<span lang=EN-US>i</span>节点上的设备号字段为<span
|
||
lang=EN-US>0</span>，说明该节点没有使用。于是用<span lang=EN-US>0</span>清空对应<span lang=EN-US>i</span>节点所占内存</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>区并返回。<span lang=EN-US>memset()</span>定义在
|
||
<span lang=EN-US>include/string.h </span>第<span lang=EN-US>395</span>行开始处。这里表示用<span
|
||
lang=EN-US>0</span>填写<span lang=EN-US>inode</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>指针指定处、长度是 <span
|
||
lang=EN-US>sizeof(*inode) </span>的内存块。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>113</span></u><span
|
||
lang=EN-US> if (!inode)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>114</span></u><span
|
||
lang=EN-US>
|
||
return;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>115</span></u><span
|
||
lang=EN-US> if
|
||
(!inode->i_dev) {</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>116</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>memset</span></u>(inode,0,sizeof(*inode));</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>117</span></u><span
|
||
lang=EN-US> return;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>118</span></u><span
|
||
lang=EN-US> }</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>如果此<span lang=EN-US>i</span>节点还有其他程序引用，则不能释放，说明内核有问题，停机。如果文件连接数</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>不为<span lang=EN-US>0</span>，则表示还有其他文件目录项在使用该节点，因此也不应释放，而应该放回等。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>119</span></u><span
|
||
lang=EN-US> if
|
||
(inode->i_count>1) {</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>120</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>printk</span></u>(<i>"trying to free inode
|
||
with count=%d\n"</i>,inode->i_count);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>121</span></u><span
|
||
lang=EN-US> <u><span
|
||
style='color:blue'>panic</span></u>(<i>"free_inode"</i>);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>122</span></u><span
|
||
lang=EN-US> }</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>123</span></u><span
|
||
lang=EN-US> if
|
||
(inode->i_nlinks)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>124</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>panic</span></u>(<i>"trying to free inode with
|
||
links"</i>);</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>在判断完<span lang=EN-US>i</span>节点的合理性之后，我们开始利用其超级块信息对其中的<span
|
||
lang=EN-US>i</span>节点位图进行操作。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>首先取<span lang=EN-US>i</span>节点所在设备的超级块，测试设备是否存在。然后判断<span
|
||
lang=EN-US>i</span>节点号的范围是否正确，</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>如果 <span lang=EN-US>i</span>节点号等于<span
|
||
lang=EN-US>0 </span>或 大于该设备上 <span lang=EN-US>i</span>节点总数，则出错（<span
|
||
lang=EN-US>0</span>号<span lang=EN-US>i</span>节点保留没有使用）。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>如果该<span lang=EN-US>i</span>节点对应的节点位图不存在，则出错。因为一个缓冲块的<span
|
||
lang=EN-US>i</span>节点位图有<span lang=EN-US> 8192 </span>比</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>特位。因此<span lang=EN-US>i_num>>13</span>（即<span
|
||
lang=EN-US>i_num/8192</span>）可以得到当前<span lang=EN-US>i</span>节点号所在的<span
|
||
lang=EN-US>s_imap[]</span>项，即所</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>在盘块。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>125</span></u><span
|
||
lang=EN-US> if (!(sb = <u><span
|
||
style='color:blue'>get_super</span></u>(inode->i_dev)))</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>126</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>panic</span></u>(<i>"trying to free inode on
|
||
nonexistent device"</i>);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>127</span></u><span
|
||
lang=EN-US> if (inode->i_num
|
||
< 1 || inode->i_num > sb->s_ninodes)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>128</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>panic</span></u>(<i>"trying to free inode 0 or
|
||
nonexistant inode"</i>);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>129</span></u><span
|
||
lang=EN-US> if
|
||
(!(bh=sb->s_imap[inode->i_num>>13]))</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>130</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>panic</span></u>(<i>"nonexistent imap in
|
||
superblock"</i>);</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>现在我们复位<span
|
||
lang=EN-US>i</span>节点对应的节点位图中的比特位。如果该比特位已经等于<span lang=EN-US>0</span>，则显示出错</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>警告信息。最后置<span
|
||
lang=EN-US>i</span>节点位图所在缓冲区已修改标志，并清空该<span lang=EN-US>i</span>节点结构所占内存区。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>131</span></u><span
|
||
lang=EN-US> if (<u><span
|
||
style='color:blue'>clear_bit</span></u>(inode->i_num&8191,bh->b_data))</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>132</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>printk</span></u>(<i>"free_inode: bit already
|
||
cleared.\n\r"</i>);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>133</span></u><span
|
||
lang=EN-US> bh->b_dirt = 1;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>134</span></u><span
|
||
lang=EN-US> <u><span
|
||
style='color:blue'>memset</span></u>(inode,0,sizeof(*inode));</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>135</span></u><span
|
||
lang=EN-US> }</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>136</span></u><span
|
||
lang=EN-US> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> //// </span>为设备<span lang=EN-US>dev</span>建立一个新<span
|
||
lang=EN-US>i</span>节点。初始化并返回该新<span lang=EN-US>i</span>节点的指针。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>在内存<span lang=EN-US>i</span>节点表中获取一个空闲<span
|
||
lang=EN-US>i</span>节点表项，并从<span lang=EN-US>i</span>节点位图中找一个空闲<span lang=EN-US>i</span>节点。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>137</span></u><span
|
||
lang=EN-US> struct <u><span style='color:blue'>m_inode</span></u> * <u><span
|
||
style='color:blue'>new_inode</span></u>(int dev)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>138</span></u><span
|
||
lang=EN-US> {</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>139</span></u><span
|
||
lang=EN-US> struct <u><span
|
||
style='color:blue'>m_inode</span></u> * inode;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>140</span></u><span
|
||
lang=EN-US> struct <u><span
|
||
style='color:blue'>super_block</span></u> * sb;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>141</span></u><span
|
||
lang=EN-US> struct <u><span
|
||
style='color:blue'>buffer_head</span></u> * bh;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>142</span></u><span
|
||
lang=EN-US> int i,j;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>143</span></u><span
|
||
lang=EN-US> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>首先从内存<span lang=EN-US>i</span>节点表（<span
|
||
lang=EN-US>inode_table</span>）中获取一个空闲<span lang=EN-US>i</span>节点项，并读取指定设备的超级块</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>结构。 然后扫描超级块中<span
|
||
lang=EN-US>8</span>块<span lang=EN-US>i</span>节点位图，寻找首个<span lang=EN-US>0</span>比特位，寻找空闲节点，获取放置</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>该<span lang=EN-US>i</span>节点的节点号。如果全部扫描完还没找到，或者位图所在的缓冲块无效（<span
|
||
lang=EN-US>bh = NULL</span>），</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>则放回先前申请的<span
|
||
lang=EN-US>i</span>节点表中的<span lang=EN-US>i</span>节点，并返回空指针退出（没有空闲<span
|
||
lang=EN-US>i</span>节点）。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>144</span></u><span
|
||
lang=EN-US> if (!(inode=<u><span
|
||
style='color:blue'>get_empty_inode</span></u>()))
|
||
// fs/inode.c</span>，第<span lang=EN-US>197</span>行。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>145</span></u><span
|
||
lang=EN-US>
|
||
return <u><span style='color:blue'>NULL</span></u>;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>146</span></u><span
|
||
lang=EN-US> if (!(sb = <u><span
|
||
style='color:blue'>get_super</span></u>(dev)))
|
||
// fs/super.c</span>，第<span
|
||
lang=EN-US>56</span>行。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>147</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>panic</span></u>(<i>"new_inode with unknown
|
||
device"</i>);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>148</span></u><span
|
||
lang=EN-US> j = 8192;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>149</span></u><span
|
||
lang=EN-US> for (i=0 ; i<8 ;
|
||
i++)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>150</span></u><span
|
||
lang=EN-US>
|
||
if (bh=sb->s_imap[i])</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>151</span></u><span
|
||
lang=EN-US>
|
||
if ((j=<u><span style='color:blue'>find_first_zero</span></u>(bh->b_data))<8192)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>152</span></u><span
|
||
lang=EN-US>
|
||
break;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>153</span></u><span
|
||
lang=EN-US> if (!bh || j >=
|
||
8192 || j+i*8192 > sb->s_ninodes) {</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>154</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>iput</span></u>(inode);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>155</span></u><span
|
||
lang=EN-US>
|
||
return <u><span style='color:blue'>NULL</span></u>;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>156</span></u><span
|
||
lang=EN-US> }</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>现在我们已经找到了还未使用的<span
|
||
lang=EN-US>i</span>节点号<span lang=EN-US>j</span>。于是置位<span lang=EN-US>i</span>节点<span
|
||
lang=EN-US>j</span>对应的<span lang=EN-US>i</span>节点位图相应比</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>特位（如果已经置位，则出错）。然后置<span
|
||
lang=EN-US>i</span>节点位图所在缓冲块已修改标志。最后初始化</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>该<span lang=EN-US>i</span>节点结构（<span
|
||
lang=EN-US>i_ctime</span>是<span lang=EN-US>i</span>节点内容改变时间）。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>157</span></u><span
|
||
lang=EN-US> if (<u><span
|
||
style='color:blue'>set_bit</span></u>(j,bh->b_data))</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>158</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>panic</span></u>(<i>"new_inode: bit already
|
||
set"</i>);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>159</span></u><span
|
||
lang=EN-US> bh->b_dirt = 1;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>160</span></u><span
|
||
lang=EN-US>
|
||
inode->i_count=1;
|
||
// </span>引用计数。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>161</span></u><span
|
||
lang=EN-US>
|
||
inode->i_nlinks=1;
|
||
// </span>文件目录项链接数。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>162</span></u><span
|
||
lang=EN-US> inode->i_dev=dev;
|
||
// i</span>节点所在的设备号。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>163</span></u><span
|
||
lang=EN-US> inode->i_uid=<u><span
|
||
style='color:blue'>current</span></u>->euid;
|
||
// i</span>节点所属用户<span lang=EN-US>id</span>。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>164</span></u><span
|
||
lang=EN-US> inode->i_gid=<u><span
|
||
style='color:blue'>current</span></u>->egid;
|
||
// </span>组<span lang=EN-US>id</span>。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>165</span></u><span
|
||
lang=EN-US> inode->i_dirt=1;
|
||
// </span>已修改标志置位。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>166</span></u><span
|
||
lang=EN-US> inode->i_num = j
|
||
+ i*8192;
|
||
// </span>对应设备中的<span lang=EN-US>i</span>节点号。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>167</span></u><span
|
||
lang=EN-US> inode->i_mtime =
|
||
inode->i_atime = inode->i_ctime = <u><span style='color:blue'>CURRENT_TIME</span></u>;
|
||
// </span>设置时间。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>168</span></u><span
|
||
lang=EN-US> return inode;
|
||
// </span>返回该<span lang=EN-US>i</span>节点指针。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>169</span></u><span
|
||
lang=EN-US> }</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>170</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> </span></p>
|
||
|
||
<p class=MsoNormal><span lang=EN-US> </span></p>
|
||
|
||
</div>
|
||
|
||
</body>
|
||
|
||
</html>
|