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pre
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span.1Char
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span.3CharChar5
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span.2Char
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p.100, li.100, div.100
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p.114, li.114, div.114
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p.ac, li.ac, div.ac
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p.ad, li.ad, div.ad
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p.ListTitle, li.ListTitle, div.ListTitle
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p.FigureTitle, li.FigureTitle, div.FigureTitle
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p.TableTitle, li.TableTitle, div.TableTitle
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p.ProgramTitle, li.ProgramTitle, div.ProgramTitle
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span.Char3
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span.Char4
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span.Char5
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span.Char6
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span.Char7
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span.Char8
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span.Char9
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p.59, li.59, div.59
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<div class=WordSection1 style='layout-grid:15.6pt'>
<p class=ab><a name="_Toc53320634"><span style='font-family:<3A><><EFBFBD><EFBFBD>'><EFBFBD><EFBFBD><EFBFBD><EFBFBD></span> <span
lang=EN-US>12-2 &nbsp;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>&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/bitmap.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> <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>&nbsp;&nbsp;&nbsp; /* bitmap.c</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>д<EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>i</span><EFBFBD>ڵ<EFBFBD>ʹ<EFBFBD><EFBFBD>̿<EFBFBD>λͼ<EFBFBD>Ĵ<EFBFBD><EFBFBD><EFBFBD><span lang=EN-US> */</span></p>
<p class=a><span lang=EN-US>&nbsp; <u><span style='color:blue'>8</span></u>
#include &lt;string.h&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; // </span><EFBFBD>ַ<EFBFBD><EFBFBD><EFBFBD>ͷ<EFBFBD>ļ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ҫ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>һЩ<EFBFBD>й<EFBFBD><EFBFBD>ַ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ƕ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp; <u><span style='color:blue'>9</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;//
</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʹ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>е<EFBFBD><span lang=EN-US>memset()</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD></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><EFBFBD><EFBFBD><EFBFBD>ȳ<EFBFBD><EFBFBD><EFBFBD>ͷ<EFBFBD>ļ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>task_struct</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>0</span><EFBFBD><EFBFBD><EFBFBD>ݡ<EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>11</span></u>
#include &lt;linux/kernel.h&gt; // </span><EFBFBD>ں<EFBFBD>ͷ<EFBFBD>ļ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>һЩ<EFBFBD>ں˳<EFBFBD><EFBFBD>ú<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ԭ<EFBFBD>ζ<EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>12</span></u> </span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp; &nbsp;//// </span><EFBFBD><EFBFBD>ָ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ַ<EFBFBD><EFBFBD><span
lang=EN-US>addr</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>һ<EFBFBD><EFBFBD><span lang=EN-US>1024</span><EFBFBD>ֽ<EFBFBD><EFBFBD>ڴ<EFBFBD><EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp; &nbsp;&nbsp;// </span><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>eax
= 0</span><EFBFBD><EFBFBD><span lang=EN-US>ecx = </span><EFBFBD>Գ<EFBFBD><EFBFBD><EFBFBD>Ϊ<EFBFBD><EFBFBD>λ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ݿ鳤<EFBFBD>ȣ<EFBFBD><span lang=EN-US>BLOCK_SIZE/4</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>edi = </span>ָ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʼ<EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>ַ<span lang=EN-US>addr</span><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;<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>&nbsp;<u><span style='color:blue'>14</span></u>
__asm__(<i>&quot;cld\n\t&quot;</i> \&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
// </span><EFBFBD><EFBFBD><EFBFBD>λ<EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>15</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
<i>&quot;rep\n\t&quot;</i> \&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
// </span><EFBFBD>ظ<EFBFBD>ִ<EFBFBD>д洢<EFBFBD><EFBFBD><EFBFBD>ݣ<EFBFBD><span lang=EN-US>0</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>16</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
<i>&quot;stosl&quot;</i> \</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>17</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
::<i>&quot;a&quot;</i> (0),<i>&quot;c&quot;</i> (<u><span style='color:blue'>BLOCK_SIZE</span></u>/4),<i>&quot;D&quot;</i>
((long) (addr)):<i>&quot;cx&quot;</i>,<i>&quot;di&quot;</i>)</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>18</span></u> </span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; //// </span><EFBFBD><EFBFBD>ָ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ַ<EFBFBD><EFBFBD>ʼ<EFBFBD>ĵ<EFBFBD><span
lang=EN-US>nr</span><EFBFBD><EFBFBD>λƫ<EFBFBD>ƴ<EFBFBD><EFBFBD>ı<EFBFBD><EFBFBD><EFBFBD>λ<EFBFBD><EFBFBD>λ<EFBFBD><EFBFBD><span lang=EN-US>nr</span><EFBFBD>ɴ<EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>32</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ԭ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>λֵ<EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>%0
-eax</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ֵ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>%1 -eax(0)</span><EFBFBD><EFBFBD><span lang=EN-US>%2 -nr</span><EFBFBD><EFBFBD>λƫ<EFBFBD><EFBFBD>ֵ<EFBFBD><EFBFBD><span
lang=EN-US>%3 -(addr)</span><EFBFBD><EFBFBD><span lang=EN-US>addr</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ݡ<EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD><span lang=EN-US>20</span><EFBFBD>ж<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>һ<EFBFBD><EFBFBD><EFBFBD>ֲ<EFBFBD><EFBFBD>Ĵ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>res</span><EFBFBD><EFBFBD><EFBFBD>ñ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ָ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>eax</span><EFBFBD>Ĵ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>У<EFBFBD><EFBFBD>Ա<EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD>Ч<EFBFBD><EFBFBD><EFBFBD>ʺͲ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ֶ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ķ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ҫ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ƕ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>С<EFBFBD><EFBFBD><EFBFBD>ϸ˵<EFBFBD><EFBFBD><EFBFBD>μ<EFBFBD><span
lang=EN-US>gcc</span><EFBFBD>ֲ<EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // <20><></span><EFBFBD><EFBFBD>ָ<EFBFBD><EFBFBD><EFBFBD>Ĵ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>еı<EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US><EFBFBD><EFBFBD></span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>һ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʽ<EFBFBD><EFBFBD><EFBFBD>ñ<EFBFBD><EFBFBD><EFBFBD>ʽֵ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>res</span><EFBFBD><EFBFBD>ֵ<EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD><span lang=EN-US>21</span><EFBFBD><EFBFBD><EFBFBD>ϵ<EFBFBD><span
lang=EN-US>btsl</span>ָ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ڲ<EFBFBD><EFBFBD>Բ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ñ<EFBFBD><EFBFBD><EFBFBD>λ<EFBFBD><EFBFBD><span lang=EN-US>Bit Test and Set</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ѻ<EFBFBD><EFBFBD><EFBFBD>ַ<EFBFBD><EFBFBD><span
lang=EN-US>%3</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD>λƫ<EFBFBD><EFBFBD>ֵ<EFBFBD><EFBFBD><span
lang=EN-US>%2</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ָ<EFBFBD><EFBFBD><EFBFBD>ı<EFBFBD><EFBFBD><EFBFBD>λֵ<EFBFBD>ȱ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>λ<EFBFBD><EFBFBD>־<span lang=EN-US>CF</span><EFBFBD>У<EFBFBD>Ȼ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>øñ<EFBFBD><EFBFBD><EFBFBD>λΪ<span
lang=EN-US>1</span><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>ָ<EFBFBD><EFBFBD><span lang=EN-US>setb</span><EFBFBD><EFBFBD><EFBFBD>ڸ<EFBFBD><EFBFBD>ݽ<EFBFBD>λ<EFBFBD><EFBFBD>־<span
lang=EN-US>CF</span><EFBFBD><EFBFBD><EFBFBD>ò<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>%al</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>CF=1</span><EFBFBD><EFBFBD><span
lang=EN-US>%al =1</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>%al =0</span><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;<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>&nbsp;<u><span style='color:blue'>20</span></u>
register int res __asm__(<i>&quot;ax&quot;</i>); \</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>21</span></u>
__asm__ __volatile__(<i>&quot;btsl %2,%3\n\tsetb %%al&quot;</i>: \</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>22</span></u> <i>&quot;=a&quot;</i>
(res):<i>&quot;&quot;</i> (0),<i>&quot;r&quot;</i> (nr),<i>&quot;m&quot;</i>
(*(addr))); \</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>23</span></u>
res;})</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;&nbsp;&nbsp; //// </span><EFBFBD><EFBFBD>λָ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ַ<EFBFBD><EFBFBD>ʼ<EFBFBD>ĵ<EFBFBD><span
lang=EN-US>nr</span>λƫ<EFBFBD>ƴ<EFBFBD><EFBFBD>ı<EFBFBD><EFBFBD><EFBFBD>λ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ԭ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>λֵ<EFBFBD>ķ<EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>%0
-eax</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ֵ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>%1 -eax(0)</span><EFBFBD><EFBFBD><span lang=EN-US>%2 -nr</span><EFBFBD><EFBFBD>λƫ<EFBFBD><EFBFBD>ֵ<EFBFBD><EFBFBD><span
lang=EN-US>%3 -(addr)</span><EFBFBD><EFBFBD><span lang=EN-US>addr</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ݡ<EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD><span lang=EN-US>27</span><EFBFBD><EFBFBD><EFBFBD>ϵ<EFBFBD><span
lang=EN-US>btrl</span>ָ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ڲ<EFBFBD><EFBFBD>Բ<EFBFBD><EFBFBD><EFBFBD>λ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>λ<EFBFBD><EFBFBD><span lang=EN-US>Bit Test and Reset</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // btsl</span><EFBFBD><EFBFBD><EFBFBD>ƣ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ǹ<EFBFBD>λָ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>λ<EFBFBD><EFBFBD>ָ<EFBFBD><EFBFBD><span
lang=EN-US>setnb</span><EFBFBD><EFBFBD><EFBFBD>ڸ<EFBFBD><EFBFBD>ݽ<EFBFBD>λ<EFBFBD><EFBFBD>־<span lang=EN-US>CF</span><EFBFBD><EFBFBD><EFBFBD>ò<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>%al</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>CF
= 1</span><EFBFBD><EFBFBD><span lang=EN-US>%al = 0</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>%al = 1</span><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;<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>&nbsp;<u><span style='color:blue'>26</span></u>
register int res __asm__(<i>&quot;ax&quot;</i>); \</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>27</span></u>
__asm__ __volatile__(<i>&quot;btrl %2,%3\n\tsetnb %%al&quot;</i>: \</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>28</span></u> <i>&quot;=a&quot;</i>
(res):<i>&quot;&quot;</i> (0),<i>&quot;r&quot;</i> (nr),<i>&quot;m&quot;</i>
(*(addr))); \</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>29</span></u>
res;})</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>30</span></u> </span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; //// </span><EFBFBD><EFBFBD><span lang=EN-US>addr</span><EFBFBD><EFBFBD>ʼѰ<EFBFBD>ҵ<EFBFBD><span
lang=EN-US>1</span><EFBFBD><EFBFBD><span lang=EN-US>0</span>ֵ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>λ<EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>%0
- ecx(</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ֵ<span lang=EN-US>)</span><EFBFBD><EFBFBD><span lang=EN-US>%1 - ecx(0)</span><EFBFBD><EFBFBD><span
lang=EN-US>%2 - esi(addr)</span><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD><span lang=EN-US>addr</span>ָ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ַ<EFBFBD><EFBFBD>ʼ<EFBFBD><EFBFBD>λͼ<EFBFBD><EFBFBD>Ѱ<EFBFBD>ҵ<EFBFBD><span
lang=EN-US>1</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>0</span><EFBFBD>ı<EFBFBD><EFBFBD><EFBFBD>λ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>addr</span><EFBFBD>ı<EFBFBD><EFBFBD><EFBFBD>λƫ<EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>ֵ<EFBFBD><EFBFBD><EFBFBD>ء<EFBFBD><span lang=EN-US>addr</span><EFBFBD>ǻ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ĵ<EFBFBD>ַ<EFBFBD><EFBFBD>ɨ<EFBFBD><EFBFBD>Ѱ<EFBFBD>ҵķ<EFBFBD>Χ<EFBFBD><EFBFBD><span
lang=EN-US>1024</span><EFBFBD>ֽڣ<EFBFBD><span lang=EN-US>8192</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD>λ<EFBFBD><EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;<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>&nbsp;<u><span style='color:blue'>32</span></u> int
__res; \</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>33</span></u>
__asm__(<i>&quot;cld\n&quot;</i> \&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
// </span><EFBFBD><EFBFBD><EFBFBD>λ<EFBFBD><EFBFBD></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;
<i>&quot;1:\tlodsl\n\t&quot;</i> \&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
// </span>ȡ<span lang=EN-US>[esi]</span><span lang=EN-US style='font-family:
Wingdings'><EFBFBD><EFBFBD></span><span lang=EN-US>eax</span><EFBFBD><EFBFBD></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;
<i>&quot;notl %%eax\n\t&quot;</i> \&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
// eax</span><EFBFBD><EFBFBD>ÿλȡ<EFBFBD><EFBFBD><EFBFBD><EFBFBD></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;
<i>&quot;bsfl %%eax,%%edx\n\t&quot;</i> \&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD>λ<span
lang=EN-US>0</span>ɨ<EFBFBD><EFBFBD><span lang=EN-US>eax</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>1</span><EFBFBD>ĵ<EFBFBD><span
lang=EN-US>1</span><EFBFBD><EFBFBD>λ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ƫ<EFBFBD><EFBFBD>ֵ<span lang=EN-US style='font-family:Wingdings'><EFBFBD><EFBFBD></span><span
lang=EN-US>edx</span><EFBFBD><EFBFBD></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;
<i>&quot;je 2f\n\t&quot;</i> \&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>eax</span><EFBFBD><EFBFBD>ȫ<EFBFBD><EFBFBD><span
lang=EN-US>0</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ǰ<EFBFBD><EFBFBD>ת<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>2</span><EFBFBD><EFBFBD><span lang=EN-US>(40</span><EFBFBD><EFBFBD><span
lang=EN-US>)</span><EFBFBD><EFBFBD></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;
<i>&quot;addl %%edx,%%ecx\n\t&quot;</i> \&nbsp;&nbsp;&nbsp; // </span>ƫ<EFBFBD><EFBFBD>ֵ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>ecx</span><EFBFBD><EFBFBD><span lang=EN-US>ecx</span><EFBFBD><EFBFBD>λͼ<EFBFBD>׸<EFBFBD><span lang=EN-US>0</span>ֵλ<EFBFBD><EFBFBD>ƫ<EFBFBD><EFBFBD>ֵ<EFBFBD><EFBFBD><EFBFBD><EFBFBD></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;
<i>&quot;jmp 3f\n&quot;</i> \&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD>ǰ<EFBFBD><EFBFBD>ת<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>3</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD></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;<i>&quot;2:\taddl $32,%%ecx\n\t&quot;</i> \&nbsp; // </span>δ<EFBFBD>ҵ<EFBFBD><span
lang=EN-US>0</span>ֵλ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>ecx</span><EFBFBD><EFBFBD><span lang=EN-US>1</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ֵ<EFBFBD>λƫ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>32</span><EFBFBD><EFBFBD></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;
<i>&quot;cmpl $8192,%%ecx\n\t&quot;</i> \&nbsp;&nbsp;&nbsp; // </span><EFBFBD>Ѿ<EFBFBD>ɨ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>8192</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD>λ<EFBFBD><EFBFBD><span lang=EN-US>1024</span><EFBFBD>ֽڣ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD></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;
<i>&quot;jl 1b\n&quot;</i> \&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
// </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD>û<EFBFBD><EFBFBD>ɨ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>1</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ݣ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ǰ<EFBFBD><EFBFBD>ת<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>1</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD></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;
<i>&quot;3:&quot;</i> \&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
// </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʱ<span lang=EN-US>ecx</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD>λƫ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD></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;
:<i>&quot;=c&quot;</i> (__res):<i>&quot;c&quot;</i> (0),<i>&quot;S&quot;</i>
(addr):<i>&quot;ax&quot;</i>,<i>&quot;dx&quot;</i>,<i>&quot;si&quot;</i>); \</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>45</span></u>
__res;})</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>46</span></u> </span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; //// </span><EFBFBD>ͷ<EFBFBD><EFBFBD><span
lang=EN-US>dev</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>е<EFBFBD><EFBFBD>߼<EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>block</span><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD>λָ<EFBFBD><EFBFBD><EFBFBD>߼<EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>block</span><EFBFBD><EFBFBD>Ӧ<EFBFBD><EFBFBD><EFBFBD>߼<EFBFBD><EFBFBD><EFBFBD>λͼ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>λ<EFBFBD><EFBFBD><EFBFBD>ɹ<EFBFBD><EFBFBD>򷵻<EFBFBD><span lang=EN-US>1</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>򷵻<EFBFBD><span
lang=EN-US>0</span><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>dev</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ţ<EFBFBD><span
lang=EN-US>block</span><EFBFBD><EFBFBD><EFBFBD>߼<EFBFBD><EFBFBD><EFBFBD>ţ<EFBFBD><EFBFBD>̿<EFBFBD>ţ<EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;<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>&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>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
struct <u><span style='color:blue'>super_block</span></u> * sb;</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;
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'>51</span></u> </span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ȡ<EFBFBD><span lang=EN-US>dev</span><EFBFBD><EFBFBD><EFBFBD>ļ<EFBFBD>ϵͳ<EFBFBD>ij<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ϣ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʼ<EFBFBD>߼<EFBFBD><EFBFBD><EFBFBD>ź<EFBFBD><EFBFBD>ļ<EFBFBD>ϵͳ<EFBFBD><EFBFBD><EFBFBD>߼<EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ϣ<EFBFBD>жϲ<EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>block</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ч<EFBFBD>ԡ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ָ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ڣ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ͣ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>߼<EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD>С<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>1</span><EFBFBD><EFBFBD><EFBFBD>߼<EFBFBD><EFBFBD><EFBFBD>Ŀ<EFBFBD>Ż<EFBFBD><EFBFBD>ߴ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>߼<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ҳ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ͣ<EFBFBD><EFBFBD><EFBFBD><EFBFBD></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;
if (!(sb = <u><span style='color:blue'>get_super</span></u>(dev)))&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;// fs/super.c</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>56</span><EFBFBD>С<EFBFBD></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;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
<u><span style='color:blue'>panic</span></u>(<i>&quot;trying to free block on
nonexistent device&quot;</i>);</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;
if (block &lt; sb-&gt;s_firstdatazone || block &gt;= sb-&gt;s_nzones)</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;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
<u><span style='color:blue'>panic</span></u>(<i>&quot;trying to free block not
in datazone&quot;</i>);</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>56</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
bh = <u><span style='color:blue'>get_hash_table</span></u>(dev,block);</span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>Ȼ<EFBFBD><EFBFBD><EFBFBD> <span lang=EN-US>hash</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ѱ<EFBFBD>Ҹÿ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ݡ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ҵ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ж<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ч<EFBFBD>ԣ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>޸ĺ͸<EFBFBD><EFBFBD>±<EFBFBD>־<EFBFBD><EFBFBD><EFBFBD>ͷ<EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ݿ顣<EFBFBD>öδ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ҫ<EFBFBD><EFBFBD>;<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>߼<EFBFBD><EFBFBD><EFBFBD>Ŀǰ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ڸ<EFBFBD><EFBFBD>ٻ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>У<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ͷŶ<EFBFBD>Ӧ<EFBFBD>Ļ<EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD></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;
if (bh) {</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;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
if (bh-&gt;b_count &gt; 1) {&nbsp;&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ô<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>1</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>brelse()</span><EFBFBD><EFBFBD></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;&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);&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;//
b_count--</span><EFBFBD><EFBFBD><EFBFBD>˳<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ÿ黹<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>á<EFBFBD></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;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
return 0;</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;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
}</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;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
bh-&gt;b_dirt=0;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;//
</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD>λ<EFBFBD><EFBFBD><EFBFBD>޸ĺ<EFBFBD><EFBFBD>Ѹ<EFBFBD><EFBFBD>±<EFBFBD>־<EFBFBD><EFBFBD></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;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
bh-&gt;b_uptodate=0;</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;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
if (bh-&gt;b_count)&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;//
</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʱ<span lang=EN-US>b_count</span>Ϊ<span lang=EN-US>1</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>brelse()</span><EFBFBD>ͷ<EFBFBD>֮<EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>65</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'>brelse</span></u>(bh);</span></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;
}</span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ǹ<EFBFBD>λ<span
lang=EN-US>block</span><EFBFBD><EFBFBD><EFBFBD>߼<EFBFBD><EFBFBD><EFBFBD>λͼ<EFBFBD>еı<EFBFBD><EFBFBD><EFBFBD>λ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>0</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ȼ<EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>block</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʼ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>߼<EFBFBD><EFBFBD><EFBFBD>ţ<EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>1</span><EFBFBD><EFBFBD>ʼ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ȼ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>߼<EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>(</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>)</span>λͼ<EFBFBD><EFBFBD><EFBFBD>в<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>λ<EFBFBD><EFBFBD>Ӧ<EFBFBD>ı<EFBFBD><EFBFBD><EFBFBD>λ<EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ӧ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>λԭ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>0</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ͣ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>1</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>1024</span><EFBFBD>ֽڣ<EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>8192</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD>λ<EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD><EFBFBD> <span lang=EN-US>block/8192
</span><EFBFBD><EFBFBD><EFBFBD>ɼ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ָ<EFBFBD><EFBFBD><EFBFBD><EFBFBD> <span lang=EN-US>block </span><EFBFBD><EFBFBD><EFBFBD>߼<EFBFBD>λͼ<EFBFBD>е<EFBFBD><EFBFBD>ĸ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ϡ<EFBFBD><EFBFBD><EFBFBD> <span lang=EN-US>block&amp;8191
</span><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD>Եõ<EFBFBD><span lang=EN-US>block</span><EFBFBD><EFBFBD><EFBFBD>߼<EFBFBD><EFBFBD><EFBFBD>λͼ<EFBFBD><EFBFBD>ǰ<EFBFBD><EFBFBD><EFBFBD>еı<EFBFBD><EFBFBD><EFBFBD>ƫ<EFBFBD><EFBFBD>λ<EFBFBD>á<EFBFBD></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;
block -= sb-&gt;s_firstdatazone - 1 ; // </span><EFBFBD><EFBFBD><span lang=EN-US>block = block
- ( s_firstdatazone -1);</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;
if (<u><span style='color:blue'>clear_bit</span></u>(block&amp;8191,sb-&gt;s_zmap[block/8192]-&gt;b_data))
{</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;
<u><span style='color:blue'>printk</span></u>(<i>&quot;block (%04x:%d) &quot;</i>,dev,block+sb-&gt;s_firstdatazone-1);</span></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;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
<u><span style='color:blue'>printk</span></u>(<i>&quot;free_block: bit already
cleared\n&quot;</i>);</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;
}</span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ӧ<EFBFBD>߼<EFBFBD><EFBFBD><EFBFBD>λͼ<EFBFBD><EFBFBD><EFBFBD>ڻ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>޸ı<EFBFBD>־<EFBFBD><EFBFBD></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;
sb-&gt;s_zmap[block/8192]-&gt;b_dirt = 1;</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;
return 1;</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>74</span></u> }</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>75</span></u> </span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; ////</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>һ<EFBFBD><EFBFBD><EFBFBD>߼<EFBFBD><EFBFBD><EFBFBD>̿飬<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ȡ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ij<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ڳ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>е<EFBFBD><EFBFBD>߼<EFBFBD><EFBFBD><EFBFBD>λͼ<EFBFBD><EFBFBD>Ѱ<EFBFBD>ҵ<EFBFBD>һ<EFBFBD><EFBFBD><span
lang=EN-US>0</span>ֵ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>λ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>һ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>߼<EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ȼ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>λ<EFBFBD><EFBFBD>Ӧ<EFBFBD>߼<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>߼<EFBFBD><EFBFBD><EFBFBD>λͼ<EFBFBD>еı<EFBFBD><EFBFBD><EFBFBD>λ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ϊ<EFBFBD><EFBFBD><EFBFBD>߼<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ڻ<EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ȡ<EFBFBD><EFBFBD>һ<EFBFBD><EFBFBD><EFBFBD>Ӧ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>󽫸û<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ѹ<EFBFBD><EFBFBD>±<EFBFBD>־<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>޸ı<EFBFBD>־<EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>߼<EFBFBD><EFBFBD><EFBFBD>š<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ִ<EFBFBD>гɹ<EFBFBD><EFBFBD>򷵻<EFBFBD><EFBFBD>߼<EFBFBD><EFBFBD><EFBFBD>ţ<EFBFBD><EFBFBD>̿<EFBFBD>ţ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>򷵻<EFBFBD><span
lang=EN-US>0</span><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;<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>&nbsp;<u><span style='color:blue'>77</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;
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'>79</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
struct <u><span style='color:blue'>super_block</span></u> * sb;</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;
int i,j;</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>81</span></u> </span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD><EFBFBD>Ȼ<EFBFBD>ȡ<EFBFBD><span
lang=EN-US>dev</span><EFBFBD>ij<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ָ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ij<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ڣ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ͣ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ȼ<EFBFBD><EFBFBD>ɨ<EFBFBD><EFBFBD><EFBFBD>ļ<EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>ϵͳ<EFBFBD><EFBFBD><span lang=EN-US>8</span><EFBFBD><EFBFBD><EFBFBD>߼<EFBFBD><EFBFBD><EFBFBD>λͼ<EFBFBD><EFBFBD>Ѱ<EFBFBD><EFBFBD><EFBFBD>׸<EFBFBD><span
lang=EN-US>0</span>ֵ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>λ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ѱ<EFBFBD>ҿ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>߼<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ȡ<EFBFBD><EFBFBD><EFBFBD>ø<EFBFBD><EFBFBD>߼<EFBFBD><EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD>š<EFBFBD> <20><><EFBFBD>ȫ<EFBFBD><C8AB>ɨ<EFBFBD><C9A8><EFBFBD><EFBFBD><span
lang=EN-US>8</span><EFBFBD><EFBFBD><EFBFBD>߼<EFBFBD><EFBFBD><EFBFBD>λͼ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>б<EFBFBD><EFBFBD><EFBFBD>λ<EFBFBD><EFBFBD><span lang=EN-US>i &gt;= 8 </span><EFBFBD><EFBFBD> <span
lang=EN-US>j &gt;= 8192</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD>û<EFBFBD>ҵ<EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // 0</span>ֵ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>λ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>λͼ<EFBFBD><EFBFBD><EFBFBD>ڵĻ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ָ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ч<span
lang=EN-US>(bh = NULL)</span><EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD><span lang=EN-US>0</span><EFBFBD>˳<EFBFBD><EFBFBD><EFBFBD>û<EFBFBD>п<EFBFBD><EFBFBD><EFBFBD><EFBFBD>߼<EFBFBD><EFBFBD><EFBFBD><EFBFBD></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;
if (!(sb = <u><span style='color:blue'>get_super</span></u>(dev)))</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;
<u><span style='color:blue'>panic</span></u>(<i>&quot;trying to get new block
from nonexistant device&quot;</i>);</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;
j = 8192;</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;
for (i=0 ; i&lt;8 ; i++)</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;
if (bh=sb-&gt;s_zmap[i])</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;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
if ((j=<u><span style='color:blue'>find_first_zero</span></u>(bh-&gt;b_data))&lt;8192)</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;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
break;</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;
if (i&gt;=8 || !bh || j&gt;=8192)</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;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
return 0;</span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ҵ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>߼<EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>j</span><EFBFBD><EFBFBD>Ӧ<EFBFBD>߼<EFBFBD><EFBFBD><EFBFBD>λͼ<EFBFBD>еı<EFBFBD><EFBFBD><EFBFBD>λ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ӧ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>λ<EFBFBD>Ѿ<EFBFBD><EFBFBD><EFBFBD>λ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>ͣ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ô<EFBFBD><EFBFBD>λͼ<EFBFBD>Ķ<EFBFBD>Ӧ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>޸ı<EFBFBD>־<EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ϊ<EFBFBD>߼<EFBFBD><EFBFBD><EFBFBD>λͼ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʾ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD>߼<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ռ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>߼<EFBFBD><EFBFBD><EFBFBD>λͼ<EFBFBD>б<EFBFBD><EFBFBD><EFBFBD>λƫ<EFBFBD><EFBFBD>ֵ<EFBFBD><EFBFBD>ʾ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʼ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ŀ<EFBFBD>ţ<EFBFBD><EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ҫ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>1</span><EFBFBD><EFBFBD><EFBFBD>߼<EFBFBD><EFBFBD><EFBFBD>Ŀ<EFBFBD>ţ<EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>j</span>ת<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>߼<EFBFBD><EFBFBD><EFBFBD>š<EFBFBD><EFBFBD><EFBFBD>ʱ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>߼<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ϵ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>߼<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>˵<EFBFBD><EFBFBD>ָ<EFBFBD><EFBFBD><EFBFBD>߼<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ڶ<EFBFBD>Ӧ<EFBFBD><EFBFBD>ϲ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ڡ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʧ<EFBFBD>ܣ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>0</span><EFBFBD>˳<EFBFBD><EFBFBD><EFBFBD></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;
if (<u><span style='color:blue'>set_bit</span></u>(j,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;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
<u><span style='color:blue'>panic</span></u>(<i>&quot;new_block: bit already
set&quot;</i>);</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;
bh-&gt;b_dirt = 1;</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;
j += i*8192 + sb-&gt;s_firstdatazone-1;</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;
if (j &gt;= sb-&gt;s_nzones)</span></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;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
return 0;</span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>Ȼ<EFBFBD><EFBFBD><EFBFBD>ڸ<EFBFBD><EFBFBD>ٻ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ϊ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ָ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>߼<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ȡ<EFBFBD><EFBFBD>һ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ػ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ͷָ<EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD>Ϊ<EFBFBD><EFBFBD>ȡ<EFBFBD>õ<EFBFBD><EFBFBD>߼<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ô<EFBFBD><EFBFBD><EFBFBD>һ<EFBFBD><EFBFBD>Ϊ<span
lang=EN-US>1</span><EFBFBD><EFBFBD><span lang=EN-US>getblk()</span><EFBFBD>л<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ã<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ϊ<span
lang=EN-US>1</span><EFBFBD><EFBFBD>ͣ<EFBFBD><EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>߼<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ѹ<EFBFBD><EFBFBD>±<EFBFBD>־<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>޸ı<EFBFBD>־<EFBFBD><EFBFBD>Ȼ<EFBFBD><EFBFBD><EFBFBD>ͷŶ<EFBFBD>Ӧ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD>߼<EFBFBD><EFBFBD><EFBFBD>š<EFBFBD></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 (!(bh=<u><span style='color:blue'>getblk</span></u>(dev,j)))</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'>panic</span></u>(<i>&quot;new_block: cannot get
block&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;
if (bh-&gt;b_count != 1)</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;
<u><span style='color:blue'>panic</span></u>(<i>&quot;new block: count is != 1&quot;</i>);</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; <u><span
style='color:blue'>clear_block</span></u>(bh-&gt;b_data);</span></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; bh-&gt;b_uptodate =
1;</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; bh-&gt;b_dirt = 1;</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; <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>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 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>&nbsp;&nbsp;&nbsp; //// </span><EFBFBD>ͷ<EFBFBD>ָ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>i</span><EFBFBD>ڵ㡣</p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD>ú<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>жϲ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>i</span><EFBFBD>ڵ<EFBFBD>ŵ<EFBFBD><EFBFBD><EFBFBD>Ч<EFBFBD>ԺͿ<EFBFBD><EFBFBD>ͷ<EFBFBD><EFBFBD>ԡ<EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>i</span><EFBFBD>ڵ<EFBFBD><EFBFBD><EFBFBD>Ȼ<EFBFBD><EFBFBD>ʹ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD><EFBFBD>ͷš<EFBFBD>Ȼ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ó<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ϣ<EFBFBD><EFBFBD><span
lang=EN-US>i</span><EFBFBD>ڵ<EFBFBD>λͼ<EFBFBD><EFBFBD><EFBFBD>в<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>λ<span lang=EN-US>i</span><EFBFBD>ڵ<EFBFBD>Ŷ<EFBFBD>Ӧ<EFBFBD><EFBFBD><span lang=EN-US>i</span><EFBFBD>ڵ<EFBFBD>λͼ<EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD>λ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>i</span><EFBFBD>ڵ<EFBFBD><EFBFBD><EFBFBD></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>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 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>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 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>&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>жϲ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ҫ<EFBFBD>ͷŵ<EFBFBD><span
lang=EN-US>i</span><EFBFBD>ڵ<EFBFBD><EFBFBD><EFBFBD>Ч<EFBFBD>Ի<EFBFBD>Ϸ<EFBFBD><EFBFBD>ԡ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>i</span><EFBFBD>ڵ<EFBFBD>ָ<EFBFBD><EFBFBD><span lang=EN-US>=NULL</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>˳<EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>i</span><EFBFBD>ڵ<EFBFBD><EFBFBD>ϵ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ֶ<EFBFBD>Ϊ<span
lang=EN-US>0</span><EFBFBD><EFBFBD>˵<EFBFBD><EFBFBD><EFBFBD>ýڵ<EFBFBD>û<EFBFBD><EFBFBD>ʹ<EFBFBD>á<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>0</span><EFBFBD><EFBFBD>ն<EFBFBD>Ӧ<span lang=EN-US>i</span><EFBFBD>ڵ<EFBFBD><EFBFBD><EFBFBD>ռ<EFBFBD>ڴ<EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ء<EFBFBD><span lang=EN-US>memset()</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
<span lang=EN-US>include/string.h </span><EFBFBD><EFBFBD><span lang=EN-US>395</span><EFBFBD>п<EFBFBD>ʼ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʾ<EFBFBD><EFBFBD><span
lang=EN-US>0</span><EFBFBD><EFBFBD>д<span lang=EN-US>inode</span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>ָ<EFBFBD><EFBFBD>ָ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <span
lang=EN-US>sizeof(*inode) </span><EFBFBD><EFBFBD><EFBFBD>ڴ<EFBFBD></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; if (!inode)</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;
return;</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; if
(!inode-&gt;i_dev) {</span></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'>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>&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'>118</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><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>i</span><EFBFBD>ڵ㻹<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ã<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ͷţ<EFBFBD>˵<EFBFBD><EFBFBD><EFBFBD>ں<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>⣬ͣ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ļ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD>Ϊ<span lang=EN-US>0</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʾ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ļ<EFBFBD>Ŀ¼<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʹ<EFBFBD>øýڵ㣬<EFBFBD><EFBFBD><EFBFBD>Ҳ<EFBFBD><EFBFBD>Ӧ<EFBFBD>ͷţ<EFBFBD><EFBFBD><EFBFBD>Ӧ<EFBFBD>÷Żصȡ<EFBFBD></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; if
(inode-&gt;i_count&gt;1) {</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;
<u><span style='color:blue'>printk</span></u>(<i>&quot;trying to free inode
with count=%d\n&quot;</i>,inode-&gt;i_count);</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;<u><span
style='color:blue'>panic</span></u>(<i>&quot;free_inode&quot;</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><u><span lang=EN-US style='color:blue'>123</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; if
(inode-&gt;i_nlinks)</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;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
<u><span style='color:blue'>panic</span></u>(<i>&quot;trying to free inode with
links&quot;</i>);</span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD><EFBFBD>ж<EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>i</span><EFBFBD>ڵ<EFBFBD>ĺ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>֮<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ǿ<EFBFBD>ʼ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ϣ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>е<EFBFBD><span
lang=EN-US>i</span><EFBFBD>ڵ<EFBFBD>λͼ<EFBFBD><EFBFBD><EFBFBD>в<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ȡ<span lang=EN-US>i</span><EFBFBD>ڵ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ij<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ƿ<EFBFBD><EFBFBD><EFBFBD>ڡ<EFBFBD>Ȼ<EFBFBD><EFBFBD><EFBFBD>ж<EFBFBD><span
lang=EN-US>i</span><EFBFBD>ڵ<EFBFBD>ŵķ<EFBFBD>Χ<EFBFBD>Ƿ<EFBFBD><EFBFBD><EFBFBD>ȷ<EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD><EFBFBD> <span lang=EN-US>i</span><EFBFBD>ڵ<EFBFBD>ŵ<EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>0 </span><EFBFBD><EFBFBD> <20><><EFBFBD>ڸ<EFBFBD><DAB8><EFBFBD><E8B1B8> <span lang=EN-US>i</span><EFBFBD>ڵ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>0</span><EFBFBD><EFBFBD><span lang=EN-US>i</span><EFBFBD>ڵ㱣<EFBFBD><EFBFBD>û<EFBFBD><EFBFBD>ʹ<EFBFBD>ã<EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>i</span><EFBFBD>ڵ<EFBFBD><EFBFBD>Ӧ<EFBFBD>Ľڵ<EFBFBD>λͼ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ڣ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ϊһ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>i</span><EFBFBD>ڵ<EFBFBD>λͼ<EFBFBD><EFBFBD><span lang=EN-US> 8192 </span><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD>λ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>i_num&gt;&gt;13</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>i_num/8192</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Եõ<EFBFBD><EFBFBD><EFBFBD>ǰ<span lang=EN-US>i</span><EFBFBD>ڵ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ڵ<EFBFBD><span
lang=EN-US>s_imap[]</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD><EFBFBD>̿顣</p>
<p class=a><u><span lang=EN-US style='color:blue'>125</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; if (!(sb = <u><span
style='color:blue'>get_super</span></u>(inode-&gt;i_dev)))</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>126</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'>panic</span></u>(<i>&quot;trying to free inode on
nonexistent device&quot;</i>);</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>127</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; if (inode-&gt;i_num
&lt; 1 || inode-&gt;i_num &gt; sb-&gt;s_ninodes)</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>128</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'>panic</span></u>(<i>&quot;trying to free inode 0 or
nonexistant inode&quot;</i>);</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>129</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; if
(!(bh=sb-&gt;s_imap[inode-&gt;i_num&gt;&gt;13]))</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>130</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'>panic</span></u>(<i>&quot;nonexistent imap in
superblock&quot;</i>);</span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ǹ<EFBFBD>λ<span
lang=EN-US>i</span><EFBFBD>ڵ<EFBFBD><EFBFBD>Ӧ<EFBFBD>Ľڵ<EFBFBD>λͼ<EFBFBD>еı<EFBFBD><EFBFBD><EFBFBD>λ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ñ<EFBFBD><EFBFBD><EFBFBD>λ<EFBFBD>Ѿ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>0</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʾ<EFBFBD><EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ϣ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>i</span><EFBFBD>ڵ<EFBFBD>λͼ<EFBFBD><EFBFBD><EFBFBD>ڻ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>޸ı<EFBFBD>־<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ո<EFBFBD><span lang=EN-US>i</span><EFBFBD>ڵ<EFBFBD><EFBFBD><EFBFBD>ռ<EFBFBD>ڴ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><u><span lang=EN-US style='color:blue'>131</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; if (<u><span
style='color:blue'>clear_bit</span></u>(inode-&gt;i_num&amp;8191,bh-&gt;b_data))</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>132</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;free_inode: bit already
cleared.\n\r&quot;</i>);</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>133</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; bh-&gt;b_dirt = 1;</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>134</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <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>&nbsp;&nbsp;&nbsp; //// </span>Ϊ<EFBFBD><span lang=EN-US>dev</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD>һ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>i</span><EFBFBD>ڵ㡣<EFBFBD><EFBFBD>ʼ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ظ<EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>i</span><EFBFBD>ڵ<EFBFBD><EFBFBD>ָ<EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD><EFBFBD>ڴ<EFBFBD><span lang=EN-US>i</span><EFBFBD>ڵ<EFBFBD><EFBFBD><EFBFBD>л<EFBFBD>ȡһ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>i</span><EFBFBD>ڵ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>i</span><EFBFBD>ڵ<EFBFBD>λͼ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>һ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>i</span><EFBFBD>ڵ㡣</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>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 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>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 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>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 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>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 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>&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD><EFBFBD>ȴ<EFBFBD><EFBFBD>ڴ<EFBFBD><span lang=EN-US>i</span><EFBFBD>ڵ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>inode_table</span><EFBFBD><EFBFBD><EFBFBD>л<EFBFBD>ȡһ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>i</span><EFBFBD>ڵ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ȡָ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ij<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD><EFBFBD> Ȼ<><C8BB>ɨ<EFBFBD><EFBFBD><E8B3AC><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>8</span><EFBFBD><EFBFBD><span lang=EN-US>i</span><EFBFBD>ڵ<EFBFBD>λͼ<EFBFBD><EFBFBD>Ѱ<EFBFBD><EFBFBD><EFBFBD>׸<EFBFBD><span lang=EN-US>0</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD>λ<EFBFBD><EFBFBD>Ѱ<EFBFBD>ҿ<EFBFBD><EFBFBD>нڵ㣬<EFBFBD><EFBFBD>ȡ<EFBFBD><EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD><span lang=EN-US>i</span><EFBFBD>ڵ<EFBFBD>Ľڵ<EFBFBD>š<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ȫ<EFBFBD><EFBFBD>ɨ<EFBFBD><EFBFBD><EFBFBD>껹û<EFBFBD>ҵ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>λͼ<EFBFBD><EFBFBD><EFBFBD>ڵĻ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ч<EFBFBD><EFBFBD><span
lang=EN-US>bh = NULL</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD>Ż<EFBFBD><EFBFBD><EFBFBD>ǰ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>i</span><EFBFBD>ڵ<EFBFBD><EFBFBD><EFBFBD>е<EFBFBD><span lang=EN-US>i</span><EFBFBD>ڵ㣬<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ؿ<EFBFBD>ָ<EFBFBD><EFBFBD><EFBFBD>˳<EFBFBD><EFBFBD><EFBFBD>û<EFBFBD>п<EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>i</span><EFBFBD>ڵ㣩<EFBFBD><EFBFBD></p>
<p class=a><u><span lang=EN-US style='color:blue'>144</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; if (!(inode=<u><span
style='color:blue'>get_empty_inode</span></u>()))&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
// fs/inode.c</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>197</span><EFBFBD>С<EFBFBD></p>
<p class=a><u><span lang=EN-US style='color:blue'>145</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
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>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; if (!(sb = <u><span
style='color:blue'>get_super</span></u>(dev)))&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;// fs/super.c</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>56</span><EFBFBD>С<EFBFBD></p>
<p class=a><u><span lang=EN-US style='color:blue'>147</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'>panic</span></u>(<i>&quot;new_inode with unknown
device&quot;</i>);</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>148</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; j = 8192;</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>149</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; for (i=0 ; i&lt;8 ;
i++)</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>150</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
if (bh=sb-&gt;s_imap[i])</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>151</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;
if ((j=<u><span style='color:blue'>find_first_zero</span></u>(bh-&gt;b_data))&lt;8192)</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>152</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;
break;</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>153</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; if (!bh || j &gt;=
8192 || j+i*8192 &gt; sb-&gt;s_ninodes) {</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>154</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'>iput</span></u>(inode);</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>155</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
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>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; }</span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ѿ<EFBFBD><EFBFBD>ҵ<EFBFBD><EFBFBD>˻<EFBFBD>δʹ<EFBFBD>õ<EFBFBD><span
lang=EN-US>i</span><EFBFBD>ڵ<EFBFBD><EFBFBD><span lang=EN-US>j</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>λ<span lang=EN-US>i</span><EFBFBD>ڵ<EFBFBD><span
lang=EN-US>j</span><EFBFBD><EFBFBD>Ӧ<EFBFBD><EFBFBD><span lang=EN-US>i</span><EFBFBD>ڵ<EFBFBD>λͼ<EFBFBD><EFBFBD>Ӧ<EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD>λ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ѿ<EFBFBD><EFBFBD><EFBFBD>λ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ȼ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>i</span><EFBFBD>ڵ<EFBFBD>λͼ<EFBFBD><EFBFBD><EFBFBD>ڻ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>޸ı<EFBFBD>־<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʼ<EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span><EFBFBD><EFBFBD><span lang=EN-US>i</span><EFBFBD>ڵ<EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>i_ctime</span><EFBFBD><EFBFBD><span lang=EN-US>i</span><EFBFBD>ڵ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ݸı<EFBFBD>ʱ<EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><u><span lang=EN-US style='color:blue'>157</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; if (<u><span
style='color:blue'>set_bit</span></u>(j,bh-&gt;b_data))</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>158</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'>panic</span></u>(<i>&quot;new_inode: bit already
set&quot;</i>);</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>159</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; bh-&gt;b_dirt = 1;</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>160</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
inode-&gt;i_count=1;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
// </span><EFBFBD><EFBFBD><EFBFBD>ü<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><u><span lang=EN-US style='color:blue'>161</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
inode-&gt;i_nlinks=1;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
// </span><EFBFBD>ļ<EFBFBD>Ŀ¼<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><u><span lang=EN-US style='color:blue'>162</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;inode-&gt;i_dev=dev;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
// i</span><EFBFBD>ڵ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ڵ<EFBFBD><EFBFBD><EFBFBD>š<EFBFBD></p>
<p class=a><u><span lang=EN-US style='color:blue'>163</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; inode-&gt;i_uid=<u><span
style='color:blue'>current</span></u>-&gt;euid;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
// i</span><EFBFBD>ڵ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>û<EFBFBD><span lang=EN-US>id</span><EFBFBD><EFBFBD></p>
<p class=a><u><span lang=EN-US style='color:blue'>164</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; inode-&gt;i_gid=<u><span
style='color:blue'>current</span></u>-&gt;egid;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
// </span><EFBFBD><EFBFBD><span lang=EN-US>id</span><EFBFBD><EFBFBD></p>
<p class=a><u><span lang=EN-US style='color:blue'>165</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; inode-&gt;i_dirt=1;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
// </span><EFBFBD><EFBFBD><EFBFBD>޸ı<EFBFBD>־<EFBFBD><EFBFBD>λ<EFBFBD><EFBFBD></p>
<p class=a><u><span lang=EN-US style='color:blue'>166</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; inode-&gt;i_num = j
+ i*8192;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
// </span><EFBFBD><EFBFBD>Ӧ<EFBFBD><EFBFBD>е<EFBFBD><span lang=EN-US>i</span><EFBFBD>ڵ<EFBFBD>š<EFBFBD></p>
<p class=a><u><span lang=EN-US style='color:blue'>167</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; inode-&gt;i_mtime =
inode-&gt;i_atime = inode-&gt;i_ctime = <u><span style='color:blue'>CURRENT_TIME</span></u>;&nbsp;
// </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʱ<EFBFBD></p>
<p class=a><u><span lang=EN-US style='color:blue'>168</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; return inode;&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><EFBFBD><EFBFBD><EFBFBD>ظ<EFBFBD><span lang=EN-US>i</span><EFBFBD>ڵ<EFBFBD>ָ<EFBFBD></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>&nbsp;</span></p>
<p class=MsoNormal><span lang=EN-US>&nbsp;</span></p>
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