3662 lines
147 KiB
HTML
3662 lines
147 KiB
HTML
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|
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</head>
|
||
|
||
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|
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|
||
<div class=WordSection1 style='layout-grid:15.6pt'>
|
||
|
||
<p class=ab><a name="_Toc53320635"><span style='font-family:黑体'>程序</span><span
|
||
lang=EN-US>12-4 linux/fs/inode.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/inode.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>
|
||
#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'>8</span></u>
|
||
#include <sys/stat.h> // </span>文件状态头文件。含有文件或文件系统状态结构<span
|
||
lang=EN-US>stat{}</span>和常量。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>9</span></u> </span></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，定义了任务结构<span lang=EN-US>task_struct</span>、任务<span
|
||
lang=EN-US>0</span>的数据，</p>
|
||
|
||
<p class=a><span lang=EN-US>
|
||
// </span>还有一些有关描述符参数设置和获取的嵌入式汇编函数宏语句。</p>
|
||
|
||
<p class=a><span lang=EN-US> <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>
|
||
#include <linux/mm.h> // </span>内存管理头文件。含有页面大小定义和一些页面释放函数原型。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>13</span></u>
|
||
#include <asm/system.h> // </span>系统头文件。定义了设置或修改描述符<span
|
||
lang=EN-US>/</span>中断门等的嵌入式汇编宏。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>14</span></u> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>设备数据块总数指针数组。每个指针项指向指定主设备号的总块数数组<span
|
||
lang=EN-US>hd_sizes[]</span>。该总</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>块数数组每一项对应子设备号确定的一个子设备上所拥有的数据块总数（<span
|
||
lang=EN-US>1</span>块大小<span lang=EN-US> = 1KB</span>）。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>15</span></u>
|
||
extern int *<u><span style='color:blue'>blk_size</span></u>[];</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>16</span></u> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>17</span></u>
|
||
struct <u><span style='color:blue'>m_inode</span></u> <u><span
|
||
style='color:blue'>inode_table</span></u>[<u><span style='color:blue'>NR_INODE</span></u>]={{0,},};
|
||
// </span>内存中<span lang=EN-US>i</span>节点表（<span lang=EN-US>NR_INODE=32</span>项）。</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> <u><span style='color:blue'>19</span></u>
|
||
static void <u><span style='color:blue'>read_inode</span></u>(struct <u><span
|
||
style='color:blue'>m_inode</span></u> * inode); // </span>读指定<span
|
||
lang=EN-US>i</span>节点号的<span lang=EN-US>i</span>节点信息，<span lang=EN-US>297</span>行。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>20</span></u>
|
||
static void <u><span style='color:blue'>write_inode</span></u>(struct <u><span
|
||
style='color:blue'>m_inode</span></u> * inode); // </span>写<span lang=EN-US>i</span>节点信息到高速缓冲中，<span
|
||
lang=EN-US>324</span>行。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>21</span></u> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> //// </span>等待指定的<span
|
||
lang=EN-US>i</span>节点可用。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>如果<span lang=EN-US>i</span>节点已被锁定，则将当前任务置为不可中断的等待状态，并添加到该<span
|
||
lang=EN-US>i</span>节点的等待队</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>列<span lang=EN-US>i_wait</span>中。直到该<span
|
||
lang=EN-US>i</span>节点解锁并明确地唤醒本任务。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>22</span></u>
|
||
static inline void <u><span style='color:blue'>wait_on_inode</span></u>(struct <u><span
|
||
style='color:blue'>m_inode</span></u> * inode)</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>23</span></u> {</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>24</span></u>
|
||
<u><span style='color:blue'>cli</span></u>();</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>25</span></u>
|
||
while (inode->i_lock)</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>26</span></u>
|
||
<u><span style='color:blue'>sleep_on</span></u>(&inode->i_wait);
|
||
// kernel/sched.c</span>，第<span lang=EN-US>199</span>行。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>27</span></u>
|
||
<u><span style='color:blue'>sti</span></u>();</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>28</span></u> }</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>29</span></u> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> //// </span>对<span lang=EN-US>i</span>节点上锁（锁定指定的<span
|
||
lang=EN-US>i</span>节点）。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>如果<span lang=EN-US>i</span>节点已被锁定，则将当前任务置为不可中断的等待状态，并添加到该<span
|
||
lang=EN-US>i</span>节点的等待队</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>列<span lang=EN-US>i_wait</span>中。直到该<span
|
||
lang=EN-US>i</span>节点解锁并明确地唤醒本任务。然后对其上锁。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>30</span></u>
|
||
static inline void <u><span style='color:blue'>lock_inode</span></u>(struct <u><span
|
||
style='color:blue'>m_inode</span></u> * inode)</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>31</span></u> {</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>32</span></u>
|
||
<u><span style='color:blue'>cli</span></u>();</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>33</span></u>
|
||
while (inode->i_lock)</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>34</span></u>
|
||
<u><span style='color:blue'>sleep_on</span></u>(&inode->i_wait);</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>35</span></u>
|
||
inode->i_lock=1;
|
||
// </span>置锁定标志。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>36</span></u>
|
||
<u><span style='color:blue'>sti</span></u>();</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>37</span></u> }</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>38</span></u> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> //// </span>对指定的<span
|
||
lang=EN-US>i</span>节点解锁。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>复位<span lang=EN-US>i</span>节点的锁定标志，并明确地唤醒等待在此<span
|
||
lang=EN-US>i</span>节点等待队列<span lang=EN-US>i_wait</span>上的所有进程。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>39</span></u>
|
||
static inline void <u><span style='color:blue'>unlock_inode</span></u>(struct <u><span
|
||
style='color:blue'>m_inode</span></u> * inode)</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>40</span></u> {</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>41</span></u>
|
||
inode->i_lock=0;</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>42</span></u>
|
||
<u><span style='color:blue'>wake_up</span></u>(&inode->i_wait);
|
||
// kernel/sched.c</span>，第<span lang=EN-US>204</span>行。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>43</span></u> }</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>44</span></u> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> //// </span>释放设备<span
|
||
lang=EN-US>dev</span>在内存<span lang=EN-US>i</span>节点表中的所有<span lang=EN-US>i</span>节点。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>扫描内存中的<span
|
||
lang=EN-US>i</span>节点表数组，如果是指定设备使用的<span lang=EN-US>i</span>节点就释放之。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>45</span></u>
|
||
void <u><span style='color:blue'>invalidate_inodes</span></u>(int dev)</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> <u><span style='color:blue'>47</span></u>
|
||
int i;</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>48</span></u>
|
||
struct <u><span style='color:blue'>m_inode</span></u> * inode;</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>49</span></u> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>首先让指针指向内存<span
|
||
lang=EN-US>i</span>节点表数组首项。然后扫描<span lang=EN-US>i</span>节点表指针数组中的所有<span
|
||
lang=EN-US>i</span>节点。针对</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>其中每个<span lang=EN-US>i</span>节点，先等待该<span
|
||
lang=EN-US>i</span>节点解锁可用（若目前正被上锁的话），再判断是否属于指定</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>设备的<span lang=EN-US>i</span>节点。如果是指定设备的<span
|
||
lang=EN-US>i</span>节点，则看看它是否还被使用着，即其引用计数是否不</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>为<span lang=EN-US>0</span>。若是则显示警告信息。然后释放之，即把<span
|
||
lang=EN-US>i</span>节点的设备号字段<span lang=EN-US>i_dev</span>置<span lang=EN-US>0</span>。第<span
|
||
lang=EN-US>50</span>行上</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>的指针赋值 <span
|
||
lang=EN-US>"0+inode_table " </span>等同于 <span lang=EN-US>"inode_table"</span>、<span
|
||
lang=EN-US>"&inode_table[0] "</span>。不过这样写</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>可能更明了一些。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>50</span></u>
|
||
inode = 0+<u><span style='color:blue'>inode_table</span></u>;
|
||
// </span>指向<span lang=EN-US>i</span>节点表指针数组首项。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>51</span></u>
|
||
for(i=0 ; i<<u><span style='color:blue'>NR_INODE</span></u> ; i++,inode++) {</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>52</span></u>
|
||
<u><span style='color:blue'>wait_on_inode</span></u>(inode);
|
||
// </span>等待该<span lang=EN-US>i</span>节点可用（解锁）。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>53</span></u>
|
||
if (inode->i_dev == dev) {</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>54</span></u>
|
||
if (inode->i_count) // </span>若其引用数不为<span
|
||
lang=EN-US>0</span>，则显示出错警告。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>55</span></u>
|
||
<u><span style='color:blue'>printk</span></u>(<i>"inode in use on removed
|
||
disk\n\r"</i>);</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>56</span></u>
|
||
inode->i_dev = inode->i_dirt = 0; // </span>释放<span lang=EN-US>i</span>节点<span
|
||
lang=EN-US>(</span>置设备号为<span lang=EN-US>0)</span>。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>57</span></u>
|
||
}</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>58</span></u>
|
||
}</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>59</span></u> }</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>60</span></u> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> //// </span>同步所有<span
|
||
lang=EN-US>i</span>节点。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>把内存<span lang=EN-US>i</span>节点表中所有<span
|
||
lang=EN-US>i</span>节点与设备上<span lang=EN-US>i</span>节点作同步操作。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>61</span></u>
|
||
void <u><span style='color:blue'>sync_inodes</span></u>(void)</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>62</span></u> {</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>63</span></u>
|
||
int i;</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>64</span></u>
|
||
struct <u><span style='color:blue'>m_inode</span></u> * inode;</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>65</span></u> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>首先让内存<span lang=EN-US>i</span>节点类型的指针指向<span
|
||
lang=EN-US>i</span>节点表首项，然后扫描整个<span lang=EN-US>i</span>节点表中的节点。针对</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>其中每个<span lang=EN-US>i</span>节点，先等待该<span
|
||
lang=EN-US>i</span>节点解锁可用（若目前正被上锁的话），然后判断该<span lang=EN-US>i</span>节点</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>是否已被修改并且不是管道节点。若是这种情况则将该<span
|
||
lang=EN-US>i</span>节点写入高速缓冲区中。缓冲区</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>管理程序<span lang=EN-US>buffer.c</span>会在适当时机将它们写入盘中。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>66</span></u>
|
||
inode = 0+<u><span style='color:blue'>inode_table</span></u>;
|
||
// </span>让指针首先指向<span lang=EN-US>i</span>节点表指针数组首项。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>67</span></u>
|
||
for(i=0 ; i<<u><span style='color:blue'>NR_INODE</span></u>
|
||
; i++,inode++) { // </span>扫描<span lang=EN-US>i</span>节点表指针数组。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>68</span></u>
|
||
<u><span style='color:blue'>wait_on_inode</span></u>(inode);
|
||
// </span>等待该<span lang=EN-US>i</span>节点可用（解锁）。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>69</span></u>
|
||
if (inode->i_dirt && !inode->i_pipe) // </span>若<span
|
||
lang=EN-US>i</span>节点已修改且不是管道节点，</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>70</span></u>
|
||
<u><span style='color:blue'>write_inode</span></u>(inode); //
|
||
</span>则写盘（实际是写入缓冲区中）。</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> <u><span style='color:blue'>72</span></u> }</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>73</span></u> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> //// </span>文件数据块映射到盘块的处理操作。（<span
|
||
lang=EN-US>block</span>位图处理函数，<span lang=EN-US>bmap - block map</span>）</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>参数：<span lang=EN-US>inode
|
||
– </span>文件的<span lang=EN-US>i</span>节点指针；<span lang=EN-US>block – </span>文件中的数据块号；<span
|
||
lang=EN-US>create - </span>创建块标志。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>该函数把指定的文件数据块<span
|
||
lang=EN-US>block</span>对应到设备上逻辑块上，并返回逻辑块号。如果创建标志</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>置位，则在设备上对应逻辑块不存在时就申请新磁盘块，返回文件数据块<span
|
||
lang=EN-US>block</span>对应在设备</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>上的逻辑块号（盘块号）。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>74</span></u>
|
||
static int <u><span style='color:blue'>_bmap</span></u>(struct <u><span
|
||
style='color:blue'>m_inode</span></u> * inode,int block,int create)</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> <u><span style='color:blue'>76</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'>77</span></u>
|
||
int i;</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>78</span></u> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>首先判断参数文件数据块号<span
|
||
lang=EN-US>block</span>的有效性。如果块号小于<span lang=EN-US>0</span>，则停机。如果块号大于直接</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>块数<span lang=EN-US> + </span>间接块数<span
|
||
lang=EN-US> + </span>二次间接块数，超出文件系统表示范围，则停机。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>79</span></u>
|
||
if (block<0)</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>80</span></u>
|
||
<u><span style='color:blue'>panic</span></u>(<i>"_bmap: block<0"</i>);</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>81</span></u>
|
||
if (block >= 7+512+512*512)</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>82</span></u>
|
||
<u><span style='color:blue'>panic</span></u>(<i>"_bmap: block>big"</i>);</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>然后根据文件块号的大小值和是否设置了创建标志分别进行处理。如果该块号小于<span
|
||
lang=EN-US>7</span>，则使</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>用直接块表示。如果创建标志置位，并且<span
|
||
lang=EN-US>i</span>节点中对应该块的逻辑块（区段）字段为<span lang=EN-US>0</span>，则</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>向相应设备申请一磁盘块（逻辑块），并且将盘上逻辑块号（盘块号）填入逻辑块字段中。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>然后设置<span lang=EN-US>i</span>节点改变时间，置<span
|
||
lang=EN-US>i</span>节点已修改标志。 最后返回逻辑块号。 函数<span lang=EN-US>new_block()</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>定义在<span lang=EN-US>bitmap.c</span>程序中第<span
|
||
lang=EN-US>76</span>行开始处。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>83</span></u>
|
||
if (block<7) {</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>84</span></u>
|
||
if (create && !inode->i_zone[block])</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>85</span></u>
|
||
if (inode->i_zone[block]=<u><span style='color:blue'>new_block</span></u>(inode->i_dev))
|
||
{</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>86</span></u>
|
||
inode->i_ctime=<u><span style='color:blue'>CURRENT_TIME</span></u>; // ctime
|
||
- Change time</span>。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>87</span></u>
|
||
inode->i_dirt=1;
|
||
// </span>设置已修改标志。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>88</span></u>
|
||
}</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>89</span></u>
|
||
return inode->i_zone[block];</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>90</span></u>
|
||
}</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>如果该块号<span lang=EN-US>>=7</span>，且小于<span
|
||
lang=EN-US>7+512</span>，则说明使用的是一次间接块。下面对一次间接块进行处理。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>如果是创建，并且该<span
|
||
lang=EN-US>i</span>节点中对应间接块字段<span lang=EN-US>i_zone[7]</span>是<span
|
||
lang=EN-US>0</span>，表明文件是首次使用间接块，</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>则需申请一磁盘块用于存放间接块信息，并将此实际磁盘块号填入间接块字段中。
|
||
然后设</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>置<span lang=EN-US>i</span>节点已修改标志和修改时间。
|
||
如果创建时申请磁盘块失败，则此时<span lang=EN-US>i</span>节点间接块字段</p>
|
||
|
||
<p class=a><span lang=EN-US> // i_zone[7]</span>为<span
|
||
lang=EN-US>0</span>，则返回<span lang=EN-US>0</span>。或者不是创建，但<span lang=EN-US>i_zone[7]</span>原来就为<span
|
||
lang=EN-US>0</span>，表明<span lang=EN-US>i</span>节点中没有间</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>接块，于是映射磁盘块失败，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>
|
||
block -= 7;</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>92</span></u>
|
||
if (block<512) {</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>93</span></u>
|
||
if (create && !inode->i_zone[7])</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>94</span></u>
|
||
if (inode->i_zone[7]=<u><span
|
||
style='color:blue'>new_block</span></u>(inode->i_dev)) {</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>95</span></u>
|
||
inode->i_dirt=1;</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>96</span></u>
|
||
inode->i_ctime=<u><span style='color:blue'>CURRENT_TIME</span></u>;</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>97</span></u>
|
||
}</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>98</span></u>
|
||
if (!inode->i_zone[7])</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>99</span></u>
|
||
return
|
||
0;</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>现在读取设备上该<span
|
||
lang=EN-US>i</span>节点的一次间接块。并取该间接块上第<span lang=EN-US>block</span>项中的逻辑块号（盘块</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>号）<span lang=EN-US>i</span>。每一项占<span
|
||
lang=EN-US>2</span>个字节。如果是创建并且间接块的第<span lang=EN-US>block</span>项中的逻辑块号为<span
|
||
lang=EN-US>0</span>的话，</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>则申请一磁盘块，并让间接块中的第<span
|
||
lang=EN-US>block</span>项等于该新逻辑块块号。然后置位间接块的已</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>修改标志。如果不是创建，则<span
|
||
lang=EN-US>i</span>就是需要映射（寻找）的逻辑块号。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>100</span></u><span
|
||
lang=EN-US>
|
||
if (!(bh = <u><span style='color:blue'>bread</span></u>(inode->i_dev,inode->i_zone[7])))</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>101</span></u><span
|
||
lang=EN-US>
|
||
return 0;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>102</span></u><span
|
||
lang=EN-US>
|
||
i = ((unsigned short *) (bh->b_data))[block];</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>103</span></u><span
|
||
lang=EN-US>
|
||
if (create && !i)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>104</span></u><span
|
||
lang=EN-US>
|
||
if (i=<u><span style='color:blue'>new_block</span></u>(inode->i_dev)) {</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>105</span></u><span
|
||
lang=EN-US>
|
||
((unsigned short *)
|
||
(bh->b_data))[block]=i;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>106</span></u><span
|
||
lang=EN-US>
|
||
bh->b_dirt=1;</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>最后释放该间接块占用的缓冲块，并返回磁盘上新申请或原有的对应<span
|
||
lang=EN-US>block</span>的逻辑块块号。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>108</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'>109</span></u><span
|
||
lang=EN-US>
|
||
return i;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>110</span></u><span
|
||
lang=EN-US> }</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>若程序运行到此，则表明数据块属于二次间接块。其处理过程与一次间接块类似。下面是对</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>二次间接块的处理。首先将<span
|
||
lang=EN-US>block</span>再减去间接块所容纳的块数（<span lang=EN-US>512</span>）。然后根据是否设置</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>了创建标志进行创建或寻找处理。如果是新创建并且<span
|
||
lang=EN-US>i</span>节点的二次间接块字段为<span lang=EN-US>0</span>，则需申</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>请一磁盘块用于存放二次间接块的一级块信息，并将此实际磁盘块号填入二次间接块字段</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>中。之后，置<span
|
||
lang=EN-US>i</span>节点已修改编制和修改时间。同样地，如果创建时申请磁盘块失败，则此</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>时<span lang=EN-US>i</span>节点二次间接块字段<span
|
||
lang=EN-US>i_zone[8]</span>为<span lang=EN-US>0</span>，则返回<span lang=EN-US>0</span>。或者不是创建，但<span
|
||
lang=EN-US>i_zone[8]</span>原来就</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>为<span lang=EN-US>0</span>，表明<span
|
||
lang=EN-US>i</span>节点中没有间接块，于是映射磁盘块失败，返回<span lang=EN-US>0</span>退出。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>111</span></u><span
|
||
lang=EN-US> block -= 512;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>112</span></u><span
|
||
lang=EN-US> if (create
|
||
&& !inode->i_zone[8])</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>113</span></u><span
|
||
lang=EN-US>
|
||
if (inode->i_zone[8]=<u><span style='color:blue'>new_block</span></u>(inode->i_dev))
|
||
{</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>114</span></u><span
|
||
lang=EN-US>
|
||
inode->i_dirt=1;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>115</span></u><span
|
||
lang=EN-US>
|
||
inode->i_ctime=<u><span style='color:blue'>CURRENT_TIME</span></u>;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>116</span></u><span
|
||
lang=EN-US>
|
||
}</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>117</span></u><span
|
||
lang=EN-US> if
|
||
(!inode->i_zone[8])</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>118</span></u><span
|
||
lang=EN-US>
|
||
return 0;</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>现在读取设备上该<span
|
||
lang=EN-US>i</span>节点的二次间接块。并取该二次间接块的一级块上第 <span lang=EN-US>(block/512)</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>项中的逻辑块号<span
|
||
lang=EN-US>i</span>。如果是创建并且二次间接块的一级块上第 <span lang=EN-US>(block/512) </span>项中的逻辑</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>块号为<span lang=EN-US>0</span>的话，则需申请一磁盘块（逻辑块）作为二次间接块的二级块<span
|
||
lang=EN-US>i</span>，并让二次间接</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>块的一级块中第 <span
|
||
lang=EN-US>(block/512)</span>项等于该二级块的块号<span lang=EN-US>i</span>。然后置位二次间接块的一级块已</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>修改标志。并释放二次间接块的一级块。如果不是创建，则<span
|
||
lang=EN-US>i</span>就是需要映射（寻找）的逻</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>辑块号。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>119</span></u><span
|
||
lang=EN-US> if (!(bh=<u><span
|
||
style='color:blue'>bread</span></u>(inode->i_dev,inode->i_zone[8])))</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>120</span></u><span
|
||
lang=EN-US>
|
||
return 0;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>121</span></u><span
|
||
lang=EN-US> i = ((unsigned
|
||
short *)bh->b_data)[block>>9];</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>122</span></u><span
|
||
lang=EN-US> if (create
|
||
&& !i)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>123</span></u><span
|
||
lang=EN-US>
|
||
if (i=<u><span style='color:blue'>new_block</span></u>(inode->i_dev)) {</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>124</span></u><span
|
||
lang=EN-US>
|
||
((unsigned short *) (bh->b_data))[block>>9]=i;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>125</span></u><span
|
||
lang=EN-US>
|
||
bh->b_dirt=1;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>126</span></u><span
|
||
lang=EN-US>
|
||
}</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>127</span></u><span
|
||
lang=EN-US> <u><span
|
||
style='color:blue'>brelse</span></u>(bh);</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>如果二次间接块的二级块块号为<span
|
||
lang=EN-US>0</span>，表示申请磁盘块失败或者原来对应块号就为<span lang=EN-US>0</span>，则返</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>回<span lang=EN-US>0</span>退出。否则就从设备上读取二次间接块的二级块，并取该二级块上第<span
|
||
lang=EN-US>block</span>项中的逻</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>辑块号（与上<span
|
||
lang=EN-US>511</span>是为了限定<span lang=EN-US>block</span>值不超过<span lang=EN-US>511</span>）。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>128</span></u><span
|
||
lang=EN-US> if (!i)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>129</span></u><span
|
||
lang=EN-US>
|
||
return 0;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>130</span></u><span
|
||
lang=EN-US> if (!(bh=<u><span
|
||
style='color:blue'>bread</span></u>(inode->i_dev,i)))</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>131</span></u><span
|
||
lang=EN-US>
|
||
return 0;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>132</span></u><span
|
||
lang=EN-US> i = ((unsigned
|
||
short *)bh->b_data)[block&511];</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>如果是创建并且二级块的第<span
|
||
lang=EN-US>block</span>项中逻辑块号为<span lang=EN-US>0</span>的话，则申请一磁盘块（逻辑块），</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>作为最终存放数据信息的块。并让二级块中的第<span
|
||
lang=EN-US>block</span>项等于该新逻辑块块号<span lang=EN-US>(i)</span>。然后</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>置位二级块的已修改标志。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>133</span></u><span
|
||
lang=EN-US> if (create
|
||
&& !i)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>134</span></u><span
|
||
lang=EN-US>
|
||
if (i=<u><span style='color:blue'>new_block</span></u>(inode->i_dev)) {</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>135</span></u><span
|
||
lang=EN-US>
|
||
((unsigned short *) (bh->b_data))[block&511]=i;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>136</span></u><span
|
||
lang=EN-US>
|
||
bh->b_dirt=1;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>137</span></u><span
|
||
lang=EN-US>
|
||
}</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>最后释放该二次间接块的二级块，返回磁盘上新申请的或原有的对应<span
|
||
lang=EN-US>block</span>的逻辑块块号。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>138</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'>139</span></u><span
|
||
lang=EN-US> return i;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>140</span></u><span
|
||
lang=EN-US> }</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>141</span></u><span
|
||
lang=EN-US> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> //// </span>取文件数据块<span
|
||
lang=EN-US>block</span>在设备上对应的逻辑块号。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>参数：<span lang=EN-US>inode
|
||
– </span>文件的内存<span lang=EN-US>i</span>节点指针；<span lang=EN-US>block – </span>文件中的数据块号。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>若操作成功则返回对应的逻辑块号，否则返回<span
|
||
lang=EN-US>0</span>。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>142</span></u><span
|
||
lang=EN-US> int <u><span style='color:blue'>bmap</span></u>(struct <u><span
|
||
style='color:blue'>m_inode</span></u> * inode,int block)</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><u><span lang=EN-US style='color:blue'>144</span></u><span
|
||
lang=EN-US> return <u><span
|
||
style='color:blue'>_bmap</span></u>(inode,block,0);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>145</span></u><span
|
||
lang=EN-US> }</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>146</span></u><span
|
||
lang=EN-US> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> //// </span>取文件数据块<span
|
||
lang=EN-US>block</span>在设备上对应的逻辑块号。如果对应的逻辑块不存在就创建一块。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>并返回设备上对应的逻辑块号。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>参数：<span lang=EN-US>inode
|
||
– </span>文件的内存<span lang=EN-US>i</span>节点指针；<span lang=EN-US>block – </span>文件中的数据块号。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>若操作成功则返回对应的逻辑块号，否则返回<span
|
||
lang=EN-US>0</span>。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>147</span></u><span
|
||
lang=EN-US> int <u><span style='color:blue'>create_block</span></u>(struct <u><span
|
||
style='color:blue'>m_inode</span></u> * inode, int block)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>148</span></u><span
|
||
lang=EN-US> {</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>149</span></u><span
|
||
lang=EN-US> return <u><span
|
||
style='color:blue'>_bmap</span></u>(inode,block,1);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>150</span></u><span
|
||
lang=EN-US> }</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>151</span></u><span
|
||
lang=EN-US>
|
||
</span></p>
|
||
|
||
<p class=a><span lang=EN-US> //// </span>放回（放置）一个<span
|
||
lang=EN-US>i</span>节点<span lang=EN-US>(</span>回写入设备<span lang=EN-US>)</span>。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>该函数主要用于把<span
|
||
lang=EN-US>i</span>节点引用计数值递减<span lang=EN-US>1</span>，并且若是管道<span lang=EN-US>i</span>节点，则唤醒等待的进程。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>若是块设备文件<span
|
||
lang=EN-US>i</span>节点则刷新设备。并且若<span lang=EN-US>i</span>节点的链接计数为<span
|
||
lang=EN-US>0</span>，则释放该<span lang=EN-US>i</span>节点占用</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>的所有磁盘逻辑块，并释放该<span
|
||
lang=EN-US>i</span>节点。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>152</span></u><span
|
||
lang=EN-US> void <u><span style='color:blue'>iput</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'>153</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<span
|
||
lang=EN-US>i</span>节点的有效性，并等待<span lang=EN-US>inode</span>节点解锁（如果已上锁的话）。如果<span
|
||
lang=EN-US>i</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>节点的引用计数为<span
|
||
lang=EN-US>0</span>，表示该<span lang=EN-US>i</span>节点已经是空闲的。内核再要求对其进行放回操作，说明内</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>核中其他代码有问题。于是显示错误信息并停机。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>154</span></u><span
|
||
lang=EN-US> if (!inode)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>155</span></u><span
|
||
lang=EN-US>
|
||
return;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>156</span></u><span
|
||
lang=EN-US> <u><span
|
||
style='color:blue'>wait_on_inode</span></u>(inode);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>157</span></u><span
|
||
lang=EN-US> if
|
||
(!inode->i_count)</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>"iput: trying to free free
|
||
inode"</i>);</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>如果是管道<span lang=EN-US>i</span>节点，则唤醒等待该管道的进程，引用次数减<span
|
||
lang=EN-US>1</span>，如果还有引用则返回。否则</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>释放管道占用的内存页面，并复位该节点的引用计数值、已修改标志和管道标志，并返回。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>对于管道节点，<span
|
||
lang=EN-US>inode->i_size</span>存放着内存页地址。参见<span lang=EN-US>get_pipe_inode()</span>，<span
|
||
lang=EN-US>231</span>，<span lang=EN-US>237</span>行。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>159</span></u><span
|
||
lang=EN-US> if
|
||
(inode->i_pipe) {</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>160</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>wake_up</span></u>(&inode->i_wait);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>161</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>wake_up</span></u>(&inode->i_wait2);
|
||
// </span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>162</span></u><span
|
||
lang=EN-US>
|
||
if (--inode->i_count)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>163</span></u><span
|
||
lang=EN-US>
|
||
return;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>164</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>free_page</span></u>(inode->i_size);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>165</span></u><span
|
||
lang=EN-US>
|
||
inode->i_count=0;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>166</span></u><span
|
||
lang=EN-US>
|
||
inode->i_dirt=0;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>167</span></u><span
|
||
lang=EN-US>
|
||
inode->i_pipe=0;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>168</span></u><span
|
||
lang=EN-US>
|
||
return;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>169</span></u><span
|
||
lang=EN-US> }</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>如果<span lang=EN-US>i</span>节点对应的设备号<span
|
||
lang=EN-US> = 0</span>，则将此节点的引用计数递减<span lang=EN-US>1</span>，返回。例如用于管道操作的</p>
|
||
|
||
<p class=a><span lang=EN-US> // i</span>节点，其<span lang=EN-US>i</span>节点的设备号为<span
|
||
lang=EN-US>0</span>。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>170</span></u><span
|
||
lang=EN-US> if
|
||
(!inode->i_dev) {</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>171</span></u><span
|
||
lang=EN-US>
|
||
inode->i_count--;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>172</span></u><span
|
||
lang=EN-US>
|
||
return;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>173</span></u><span
|
||
lang=EN-US> }</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>如果是块设备文件的<span
|
||
lang=EN-US>i</span>节点，此时逻辑块字段<span lang=EN-US>0</span>（<span lang=EN-US>i_zone[0]</span>）中是设备号，则刷新该设备。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>并等待<span lang=EN-US>i</span>节点解锁。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>174</span></u><span
|
||
lang=EN-US> if (<u><span
|
||
style='color:blue'>S_ISBLK</span></u>(inode->i_mode)) {</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>175</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>sync_dev</span></u>(inode->i_zone[0]);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>176</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>wait_on_inode</span></u>(inode);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>177</span></u><span
|
||
lang=EN-US> }</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>如果<span lang=EN-US>i</span>节点的引用计数大于<span
|
||
lang=EN-US>1</span>，则计数递减<span lang=EN-US>1</span>后就直接返回（因为该<span lang=EN-US>i</span>节点还有人在用，不能</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>释放），否则就说明<span
|
||
lang=EN-US>i</span>节点的引用计数值为<span lang=EN-US>1</span>（因为第<span lang=EN-US>157</span>行已经判断过引用计数是否为零）。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>如果<span lang=EN-US>i</span>节点的链接数为<span
|
||
lang=EN-US>0</span>，则说明<span lang=EN-US>i</span>节点对应文件被删除。于是释放该<span
|
||
lang=EN-US>i</span>节点的所有逻辑块，</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>并释放该<span lang=EN-US>i</span>节点。函数<span
|
||
lang=EN-US>free_inode()</span>用于实际释放<span lang=EN-US>i</span>节点操作，即复位<span
|
||
lang=EN-US>i</span>节点对应的<span lang=EN-US>i</span>节点位</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>图比特位，清空<span
|
||
lang=EN-US>i</span>节点结构内容。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>178</span></u><span
|
||
lang=EN-US> repeat:</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>179</span></u><span
|
||
lang=EN-US> if
|
||
(inode->i_count>1) {</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>180</span></u><span
|
||
lang=EN-US>
|
||
inode->i_count--;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>181</span></u><span
|
||
lang=EN-US>
|
||
return;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>182</span></u><span
|
||
lang=EN-US> }</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>183</span></u><span
|
||
lang=EN-US> if
|
||
(!inode->i_nlinks) {</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>184</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>truncate</span></u>(inode);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>185</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>free_inode</span></u>(inode);
|
||
// bitmap.c </span>第<span lang=EN-US>108</span>行开始处。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>186</span></u><span
|
||
lang=EN-US>
|
||
return;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>187</span></u><span
|
||
lang=EN-US> }</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>如果该<span lang=EN-US>i</span>节点已作过修改，则回写更新该<span
|
||
lang=EN-US>i</span>节点，并等待该<span lang=EN-US>i</span>节点解锁。由于这里在写<span lang=EN-US>i</span>节</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>点时需要等待睡眠，此时其他进程有可能修改该<span
|
||
lang=EN-US>i</span>节点，因此在进程被唤醒后需要再次重复</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>进行上述判断过程（<span
|
||
lang=EN-US>repeat</span>）。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>188</span></u><span
|
||
lang=EN-US> if
|
||
(inode->i_dirt) {</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>189</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>write_inode</span></u>(inode);
|
||
<b><i>/* we can sleep - so do again */</i></b></span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>190</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>wait_on_inode</span></u>(inode);
|
||
/* </span>因为我们睡眠了，所以需要重复判断<span lang=EN-US> */</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>191</span></u><span
|
||
lang=EN-US>
|
||
goto repeat;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>192</span></u><span
|
||
lang=EN-US> }</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>程序若能执行到此，则说明该<span
|
||
lang=EN-US>i</span>节点的引用计数值<span lang=EN-US>i_count</span>是<span lang=EN-US>1</span>、链接数不为零，并且内容</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>没有被修改过。因此此时只要把<span
|
||
lang=EN-US>i</span>节点引用计数递减<span lang=EN-US>1</span>，返回。此时该<span lang=EN-US>i</span>节点的<span
|
||
lang=EN-US>i_count=0</span>，</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>表示已释放。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>193</span></u><span
|
||
lang=EN-US>
|
||
inode->i_count--;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>194</span></u><span
|
||
lang=EN-US> return;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>195</span></u><span
|
||
lang=EN-US> }</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>196</span></u><span
|
||
lang=EN-US> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> //// </span>从<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。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>寻找引用计数<span
|
||
lang=EN-US>count</span>为<span lang=EN-US>0</span>的<span lang=EN-US>i</span>节点，并将其写盘后清零，返回其指针。引用计数被置<span
|
||
lang=EN-US>1</span>。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>197</span></u><span
|
||
lang=EN-US> struct <u><span style='color:blue'>m_inode</span></u> * <u><span
|
||
style='color:blue'>get_empty_inode</span></u>(void)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>198</span></u><span
|
||
lang=EN-US> {</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>199</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'>200</span></u><span
|
||
lang=EN-US> static struct <u><span
|
||
style='color:blue'>m_inode</span></u> * last_inode = <u><span style='color:
|
||
blue'>inode_table</span></u>; // </span>指向<span lang=EN-US>i</span>节点表第<span
|
||
lang=EN-US>1</span>项。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>201</span></u><span
|
||
lang=EN-US> int i;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>202</span></u><span
|
||
lang=EN-US> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>在初始化<span lang=EN-US>last_inode</span>指针指向<span
|
||
lang=EN-US>i</span>节点表头一项后循环扫描整个<span lang=EN-US>i</span>节点表。如果<span
|
||
lang=EN-US>last_inode</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>已经指向<span lang=EN-US>i</span>节点表的最后<span
|
||
lang=EN-US>1</span>项之后，则让其重新指向<span lang=EN-US>i</span>节点表开始处，以继续循环寻找空闲</p>
|
||
|
||
<p class=a><span lang=EN-US> // i</span>节点项。如果 <span
|
||
lang=EN-US>last_inode</span>所指向的<span lang=EN-US>i</span>节点的计数值为<span
|
||
lang=EN-US>0</span>，则说明可能找到空闲<span lang=EN-US>i</span>节点项。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>让<span lang=EN-US>inode</span>指向该<span
|
||
lang=EN-US>i</span>节点。如果该<span lang=EN-US>i</span>节点的已修改标志和锁定标志均为<span
|
||
lang=EN-US>0</span>，则我们可以使用该</p>
|
||
|
||
<p class=a><span lang=EN-US> // i</span>节点，于是退出<span
|
||
lang=EN-US>for</span>循环。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>203</span></u><span
|
||
lang=EN-US> do {</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>204</span></u><span
|
||
lang=EN-US>
|
||
inode = <u><span style='color:blue'>NULL</span></u>;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>205</span></u><span
|
||
lang=EN-US>
|
||
for (i = <u><span style='color:blue'>NR_INODE</span></u>; i ; i--) {
|
||
// NR_INODE = 32</span>。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>206</span></u><span
|
||
lang=EN-US>
|
||
if (++last_inode >= <u><span style='color:blue'>inode_table</span></u> + <u><span
|
||
style='color:blue'>NR_INODE</span></u>)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>207</span></u><span
|
||
lang=EN-US>
|
||
last_inode = <u><span style='color:blue'>inode_table</span></u>;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>208</span></u><span
|
||
lang=EN-US>
|
||
if (!last_inode->i_count) {</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>209</span></u><span
|
||
lang=EN-US>
|
||
inode = last_inode;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>210</span></u><span
|
||
lang=EN-US>
|
||
if (!inode->i_dirt && !inode->i_lock)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>211</span></u><span
|
||
lang=EN-US>
|
||
break;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>212</span></u><span
|
||
lang=EN-US>
|
||
}</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>213</span></u><span
|
||
lang=EN-US>
|
||
}</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>如果没有找到空闲<span
|
||
lang=EN-US>i</span>节点（<span lang=EN-US>inode = NULL</span>），则将<span lang=EN-US>i</span>节点表打印出来供调试使用，并停机。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>214</span></u><span
|
||
lang=EN-US>
|
||
if (!inode) {</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>215</span></u><span
|
||
lang=EN-US>
|
||
for (i=0 ; i<<u><span style='color:blue'>NR_INODE</span></u> ; i++)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>216</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>printk</span></u>(<i>"%04x: %6d\t"</i>,<u><span
|
||
style='color:blue'>inode_table</span></u>[i].i_dev,</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>217</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>inode_table</span></u>[i].i_num);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>218</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>panic</span></u>(<i>"No free inodes in
|
||
mem"</i>);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>219</span></u><span
|
||
lang=EN-US>
|
||
}</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>等待该<span lang=EN-US>i</span>节点解锁（如果又被上锁的话）。如果该<span
|
||
lang=EN-US>i</span>节点已修改标志被置位的话，则将该</p>
|
||
|
||
<p class=a><span lang=EN-US> // i</span>节点刷新（同步）。因为刷新时可能会睡眠，因此需要再次循环等待该<span
|
||
lang=EN-US>i</span>节点解锁。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>220</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>wait_on_inode</span></u>(inode);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>221</span></u><span
|
||
lang=EN-US>
|
||
while (inode->i_dirt) {</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>222</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>write_inode</span></u>(inode);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>223</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>wait_on_inode</span></u>(inode);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>224</span></u><span
|
||
lang=EN-US>
|
||
}</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>225</span></u><span
|
||
lang=EN-US> } while
|
||
(inode->i_count);</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>如果<span lang=EN-US>i</span>节点又被其他占用的话（<span
|
||
lang=EN-US>i</span>节点的计数值不为<span lang=EN-US>0</span>了），则重新寻找空闲<span lang=EN-US>i</span>节点。否则</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>说明已找到符合要求的空闲<span
|
||
lang=EN-US>i</span>节点项。则将该<span lang=EN-US>i</span>节点项内容清零，并置引用计数为<span
|
||
lang=EN-US>1</span>，返回</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>该<span lang=EN-US>i</span>节点指针。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>226</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'>227</span></u><span
|
||
lang=EN-US> inode->i_count =
|
||
1;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>228</span></u><span
|
||
lang=EN-US> return inode;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>229</span></u><span
|
||
lang=EN-US> }</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>230</span></u><span
|
||
lang=EN-US> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> //// </span>获取管道节点。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>首先扫描<span lang=EN-US>i</span>节点表，寻找一个空闲<span
|
||
lang=EN-US>i</span>节点项，然后取得一页空闲内存供管道使用。然后将得</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>到的<span lang=EN-US>i</span>节点的引用计数置为<span
|
||
lang=EN-US>2(</span>读者和写者<span lang=EN-US>)</span>，初始化管道头和尾，置<span lang=EN-US>i</span>节点的管道类型表示。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>返回为<span lang=EN-US>i</span>节点指针，如果失败则返回<span
|
||
lang=EN-US>NULL</span>。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>231</span></u><span
|
||
lang=EN-US> struct <u><span style='color:blue'>m_inode</span></u> * <u><span
|
||
style='color:blue'>get_pipe_inode</span></u>(void)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>232</span></u><span
|
||
lang=EN-US> {</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>233</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'>234</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>节点表中取得一个空闲<span
|
||
lang=EN-US>i</span>节点。如果找不到空闲<span lang=EN-US>i</span>节点则返回<span lang=EN-US>NULL</span>。然后为该</p>
|
||
|
||
<p class=a><span lang=EN-US> // i</span>节点申请一页内存，并让节点的<span
|
||
lang=EN-US>i_size</span>字段指向该页面。如果已没有空闲内存，则释放该</p>
|
||
|
||
<p class=a><span lang=EN-US> // i</span>节点，并返回<span
|
||
lang=EN-US>NULL</span>。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>235</span></u><span
|
||
lang=EN-US> if (!(inode = <u><span
|
||
style='color:blue'>get_empty_inode</span></u>()))</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>236</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'>237</span></u><span
|
||
lang=EN-US> if
|
||
(!(inode->i_size=<u><span style='color:blue'>get_free_page</span></u>())) {
|
||
// </span>节点的<span lang=EN-US>i_size</span>字段指向缓冲区。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>238</span></u><span
|
||
lang=EN-US>
|
||
inode->i_count = 0;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>239</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'>240</span></u><span
|
||
lang=EN-US> }</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>然后设置该<span lang=EN-US>i</span>节点的引用计数为<span
|
||
lang=EN-US>2</span>，并复位复位管道头尾指针。<span lang=EN-US>i</span>节点逻辑块号数组<span
|
||
lang=EN-US>i_zone[]</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>的<span lang=EN-US>i_zone[0]</span>和<span
|
||
lang=EN-US>i_zone[1]</span>中分别用来存放管道头和管道尾指针。最后设置<span lang=EN-US>i</span>节点是管道<span
|
||
lang=EN-US>i</span>节</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>点标志并返回该<span
|
||
lang=EN-US>i</span>节点号。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>241</span></u><span
|
||
lang=EN-US> inode->i_count =
|
||
2; <b><i>/* sum of readers/writers */</i></b>
|
||
/* </span>读<span lang=EN-US>/</span>写两者总计<span lang=EN-US> */</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>242</span></u><span
|
||
lang=EN-US> <u><span
|
||
style='color:blue'>PIPE_HEAD</span></u>(*inode) = <u><span style='color:blue'>PIPE_TAIL</span></u>(*inode)
|
||
= 0; // </span>复位管道头尾指针。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>243</span></u><span
|
||
lang=EN-US> inode->i_pipe =
|
||
1;
|
||
// </span>置节点为管道使用的标志。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>244</span></u><span
|
||
lang=EN-US> return inode;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>245</span></u><span
|
||
lang=EN-US> }</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>246</span></u><span
|
||
lang=EN-US> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> //// </span>取得一个<span
|
||
lang=EN-US>i</span>节点。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>参数：<span lang=EN-US>dev
|
||
- </span>设备号；<span lang=EN-US>nr - i</span>节点号。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>从设备上读取指定节点号的<span
|
||
lang=EN-US>i</span>节点结构内容到内存<span lang=EN-US>i</span>节点表中，并且返回该<span
|
||
lang=EN-US>i</span>节点指针。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>首先在位于高速缓冲区中的<span
|
||
lang=EN-US>i</span>节点表中搜寻，若找到指定节点号的<span lang=EN-US>i</span>节点则在经过一些判断</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>处理后返回该<span
|
||
lang=EN-US>i</span>节点指针。否则从设备<span lang=EN-US>dev</span>上读取指定<span lang=EN-US>i</span>节点号的<span
|
||
lang=EN-US>i</span>节点信息放入<span lang=EN-US>i</span>节点表</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>中，并返回该<span
|
||
lang=EN-US>i</span>节点指针。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>247</span></u><span
|
||
lang=EN-US> struct <u><span style='color:blue'>m_inode</span></u> * <u><span
|
||
style='color:blue'>iget</span></u>(int dev,int nr)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>248</span></u><span
|
||
lang=EN-US> {</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>249</span></u><span
|
||
lang=EN-US> struct <u><span
|
||
style='color:blue'>m_inode</span></u> * inode, * empty;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>250</span></u><span
|
||
lang=EN-US> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>首先判断参数有效性。若设备号是<span
|
||
lang=EN-US>0</span>，则表明内核代码问题，显示出错信息并停机。然后预</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>先从<span lang=EN-US>i</span>节点表中取一个空闲<span
|
||
lang=EN-US>i</span>节点备用。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>251</span></u><span
|
||
lang=EN-US> if (!dev)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>252</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>panic</span></u>(<i>"iget with dev==0"</i>);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>253</span></u><span
|
||
lang=EN-US> empty = <u><span
|
||
style='color:blue'>get_empty_inode</span></u>();</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>接着扫描<span lang=EN-US>i</span>节点表。寻找参数指定节点号<span
|
||
lang=EN-US>nr</span>的<span lang=EN-US>i</span>节点。并递增该节点的引用次数。如果当</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>前扫描<span lang=EN-US>i</span>节点的设备号不等于指定的设备号或者节点号不等于指定的节点号，则继续扫描。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>254</span></u><span
|
||
lang=EN-US> inode = <u><span
|
||
style='color:blue'>inode_table</span></u>;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>255</span></u><span
|
||
lang=EN-US> while (inode < <u><span
|
||
style='color:blue'>NR_INODE</span></u>+<u><span style='color:blue'>inode_table</span></u>)
|
||
{</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>256</span></u><span
|
||
lang=EN-US>
|
||
if (inode->i_dev != dev || inode->i_num != nr) {</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>257</span></u><span
|
||
lang=EN-US>
|
||
inode++;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>258</span></u><span
|
||
lang=EN-US>
|
||
continue;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>259</span></u><span
|
||
lang=EN-US>
|
||
}</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>如果找到指定设备号<span
|
||
lang=EN-US>dev </span>和节点号<span lang=EN-US> nr </span>的<span lang=EN-US>i</span>节点，则等待该节点解锁（如果已上锁的话）。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>在等待该节点解锁过程中，<span
|
||
lang=EN-US>i</span>节点表可能会发生变化。所以再次进行上述相同判断。如果发</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>生了变化，则再次重新扫描整个<span
|
||
lang=EN-US>i</span>节点表。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>260</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>wait_on_inode</span></u>(inode);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>261</span></u><span
|
||
lang=EN-US>
|
||
if (inode->i_dev != dev || inode->i_num != nr) {</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>262</span></u><span
|
||
lang=EN-US>
|
||
inode = <u><span style='color:blue'>inode_table</span></u>;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>263</span></u><span
|
||
lang=EN-US>
|
||
continue;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>264</span></u><span
|
||
lang=EN-US>
|
||
}</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>到这里表示找到相应的<span
|
||
lang=EN-US>i</span>节点。于是将该<span lang=EN-US>i</span>节点引用计数增<span lang=EN-US>1</span>。然后再作进一步检查，看它</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>是否是另一个文件系统的安装点。若是则寻找被安装文件系统根节点并返回。如果该<span
|
||
lang=EN-US>i</span>节点</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>的确是其他文件系统的安装点，则在超级块表中搜寻安装在此<span
|
||
lang=EN-US>i</span>节点的超级块。如果没有找</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>到，则显示出错信息，并放回本函数开始时获取的空闲节点<span
|
||
lang=EN-US>empty</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'>265</span></u><span
|
||
lang=EN-US>
|
||
inode->i_count++;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>266</span></u><span
|
||
lang=EN-US>
|
||
if (inode->i_mount) {</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>267</span></u><span
|
||
lang=EN-US>
|
||
int i;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>268</span></u><span
|
||
lang=EN-US> </span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>269</span></u><span
|
||
lang=EN-US>
|
||
for (i = 0 ; i<<u><span style='color:blue'>NR_SUPER</span></u> ; i++)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>270</span></u><span
|
||
lang=EN-US>
|
||
if (<u><span style='color:blue'>super_block</span></u>[i].s_imount==inode)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>271</span></u><span
|
||
lang=EN-US>
|
||
break;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>272</span></u><span
|
||
lang=EN-US>
|
||
if (i >= <u><span style='color:blue'>NR_SUPER</span></u>) {</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>273</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>printk</span></u>(<i>"Mounted
|
||
inode hasn't got sb\n"</i>);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>274</span></u><span
|
||
lang=EN-US>
|
||
if (empty)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>275</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>iput</span></u>(empty);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>276</span></u><span
|
||
lang=EN-US>
|
||
return inode;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>277</span></u><span
|
||
lang=EN-US>
|
||
}</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>执行到这里表示已经找到安装到<span
|
||
lang=EN-US>inode</span>节点的文件系统超级块。于是将该<span lang=EN-US>i</span>节点写盘放回，</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>并从安装在此<span
|
||
lang=EN-US>i</span>节点上的文件系统超级块中取设备号，并令<span lang=EN-US>i</span>节点号为<span
|
||
lang=EN-US>ROOT_INO</span>，即为<span lang=EN-US>1</span>。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>然后重新扫描整个<span
|
||
lang=EN-US>i</span>节点表，以获取该被安装文件系统的根<span lang=EN-US>i</span>节点信息。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>278</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'>279</span></u><span
|
||
lang=EN-US>
|
||
dev = <u><span style='color:blue'>super_block</span></u>[i].s_dev;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>280</span></u><span
|
||
lang=EN-US>
|
||
nr = <u><span style='color:blue'>ROOT_INO</span></u>;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>281</span></u><span
|
||
lang=EN-US>
|
||
inode = <u><span style='color:blue'>inode_table</span></u>;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>282</span></u><span
|
||
lang=EN-US>
|
||
continue;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>283</span></u><span
|
||
lang=EN-US>
|
||
}</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>最终我们找到了相应的<span
|
||
lang=EN-US>i</span>节点。因此可以放弃本函数开始处临时申请的空闲<span lang=EN-US>i</span>节点，返回</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>找到的<span lang=EN-US>i</span>节点指针。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>284</span></u><span
|
||
lang=EN-US>
|
||
if (empty)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>285</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>iput</span></u>(empty);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>286</span></u><span
|
||
lang=EN-US> return
|
||
inode;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>287</span></u><span
|
||
lang=EN-US> }</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>如果我们在<span lang=EN-US>i</span>节点表中没有找到指定的<span
|
||
lang=EN-US>i</span>节点，则利用前面申请的空闲<span lang=EN-US>i</span>节点<span lang=EN-US>empty</span>在<span
|
||
lang=EN-US>i</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>节点表中建立该<span
|
||
lang=EN-US>i</span>节点。并从相应设备上读取该<span lang=EN-US>i</span>节点信息，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'>288</span></u><span
|
||
lang=EN-US> if (!empty)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>289</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'>290</span></u><span
|
||
lang=EN-US> inode=empty;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>291</span></u><span
|
||
lang=EN-US> inode->i_dev =
|
||
dev;
|
||
// </span>设置<span lang=EN-US>i</span>节点的设备。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>292</span></u><span
|
||
lang=EN-US> inode->i_num =
|
||
nr;
|
||
// </span>设置<span lang=EN-US>i</span>节点号。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>293</span></u><span
|
||
lang=EN-US> <u><span
|
||
style='color:blue'>read_inode</span></u>(inode);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>294</span></u><span
|
||
lang=EN-US> return inode;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>295</span></u><span
|
||
lang=EN-US> }</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>296</span></u><span
|
||
lang=EN-US> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> //// </span>读取指定<span
|
||
lang=EN-US>i</span>节点信息。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>从设备上读取含有指定<span
|
||
lang=EN-US>i</span>节点信息的<span lang=EN-US>i</span>节点盘块，然后复制到指定的<span lang=EN-US>i</span>节点结构中。
|
||
为了</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>确定<span lang=EN-US>i</span>节点所在的设备逻辑块号（或缓冲块），必须首先读取相应设备上的超级块，以获取</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>用于计算逻辑块号的每块<span
|
||
lang=EN-US>i</span>节点数信息<span lang=EN-US> INODES_PER_BLOCK</span>。 在计算出<span
|
||
lang=EN-US>i</span>节点所在的逻辑块</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>号后，就把该逻辑块读入一缓冲块中。然后把缓冲块中相应位置处的<span
|
||
lang=EN-US>i</span>节点内容复制到参数</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>指定的位置处。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>297</span></u><span
|
||
lang=EN-US> static void <u><span style='color:blue'>read_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'>298</span></u><span
|
||
lang=EN-US> {</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>299</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'>300</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'>301</span></u><span
|
||
lang=EN-US> int block;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>302</span></u><span
|
||
lang=EN-US> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>首先锁定该<span lang=EN-US>i</span>节点，并取该节点所在设备的超级块。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>303</span></u><span
|
||
lang=EN-US> <u><span
|
||
style='color:blue'>lock_inode</span></u>(inode);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>304</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'>305</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>panic</span></u>(<i>"trying to read inode
|
||
without dev"</i>);</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>该<span lang=EN-US>i</span>节点所在的设备逻辑块号<span
|
||
lang=EN-US> = (</span>启动块<span lang=EN-US> + </span>超级块<span lang=EN-US>) + i</span>节点位图占用的块数<span
|
||
lang=EN-US> + </span>逻辑块位</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>图占用的块数<span
|
||
lang=EN-US> + (i</span>节点号<span lang=EN-US>-1)/</span>每块含有的<span lang=EN-US>i</span>节点数。虽然<span
|
||
lang=EN-US>i</span>节点号从<span lang=EN-US>0</span>开始编号，但第<span lang=EN-US>1</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>个<span lang=EN-US>0</span>号<span
|
||
lang=EN-US>i</span>节点不用，并且磁盘上也不保存对应的<span lang=EN-US>0</span>号<span lang=EN-US>i</span>节点结构。因此存放<span
|
||
lang=EN-US>i</span>节点的盘块的</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>第<span lang=EN-US>1</span>块上保存的是<span
|
||
lang=EN-US>i</span>节点号是是<span lang=EN-US>1--16</span>的<span lang=EN-US>i</span>节点结构而不是<span
|
||
lang=EN-US>0--15</span>的。因此在上面计算<span lang=EN-US>i</span>节</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>点号对应的<span lang=EN-US>i</span>节点结构所在盘块时需要减<span
|
||
lang=EN-US>1</span>，即：<span lang=EN-US>B =(i</span>节点号<span lang=EN-US>-1)/</span>每块含有<span
|
||
lang=EN-US>i</span>节点结构数。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>例如，节点号<span
|
||
lang=EN-US>16</span>的<span lang=EN-US>i</span>节点结构应该在<span lang=EN-US>B=(16-1)/16
|
||
= 0</span>的块上。 这里我们从设备上读取该</p>
|
||
|
||
<p class=a><span lang=EN-US> // i</span>节点所在的逻辑块，并复制指定<span
|
||
lang=EN-US>i</span>节点内容到<span lang=EN-US>inode</span>指针所指位置处。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>306</span></u><span
|
||
lang=EN-US> block = 2 +
|
||
sb->s_imap_blocks + sb->s_zmap_blocks +</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>307</span></u><span
|
||
lang=EN-US>
|
||
(inode->i_num-1)/<u><span style='color:blue'>INODES_PER_BLOCK</span></u>;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>308</span></u><span
|
||
lang=EN-US> if (!(bh=<u><span
|
||
style='color:blue'>bread</span></u>(inode->i_dev,block)))</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>309</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>panic</span></u>(<i>"unable to read i-node
|
||
block"</i>);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>310</span></u><span
|
||
lang=EN-US> *(struct <u><span
|
||
style='color:blue'>d_inode</span></u> *)inode =</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>311</span></u><span
|
||
lang=EN-US>
|
||
((struct <u><span style='color:blue'>d_inode</span></u> *)bh->b_data)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>312</span></u><span
|
||
lang=EN-US>
|
||
[(inode->i_num-1)%<u><span style='color:blue'>INODES_PER_BLOCK</span></u>];</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>最后释放读入的缓冲块，并解锁该<span
|
||
lang=EN-US>i</span>节点。对于块设备文件，还需要设置<span lang=EN-US>i</span>节点的文件最大</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>长度值。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>313</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'>314</span></u><span
|
||
lang=EN-US> if (<u><span
|
||
style='color:blue'>S_ISBLK</span></u>(inode->i_mode)) {</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>315</span></u><span
|
||
lang=EN-US>
|
||
int i = inode->i_zone[0]; // </span>对于块设备文件，<span lang=EN-US>i_zone[0]</span>中是设备号。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>316</span></u><span
|
||
lang=EN-US>
|
||
if (<u><span style='color:blue'>blk_size</span></u>[<u><span style='color:blue'>MAJOR</span></u>(i)])</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>317</span></u><span
|
||
lang=EN-US>
|
||
inode->i_size = 1024*<u><span style='color:blue'>blk_size</span></u>[<u><span
|
||
style='color:blue'>MAJOR</span></u>(i)][<u><span style='color:blue'>MINOR</span></u>(i)];</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>318</span></u><span
|
||
lang=EN-US>
|
||
else</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>319</span></u><span
|
||
lang=EN-US>
|
||
inode->i_size = 0x7fffffff;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>320</span></u><span
|
||
lang=EN-US> }</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>321</span></u><span
|
||
lang=EN-US> <u><span
|
||
style='color:blue'>unlock_inode</span></u>(inode);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>322</span></u><span
|
||
lang=EN-US> }</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>323</span></u><span
|
||
lang=EN-US> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> //// </span>将<span lang=EN-US>i</span>节点信息写入缓冲区中。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>该函数把参数指定的<span
|
||
lang=EN-US>i</span>节点写入缓冲区相应的缓冲块中，待缓冲区刷新时会写入盘中。为了</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>确定<span lang=EN-US>i</span>节点所在的设备逻辑块号（或缓冲块），必须首先读取相应设备上的超级块，以获取</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>用于计算逻辑块号的每块<span
|
||
lang=EN-US>i</span>节点数信息<span lang=EN-US> INODES_PER_BLOCK</span>。 在计算出<span
|
||
lang=EN-US>i</span>节点所在的逻辑块</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>号后，就把该逻辑块读入一缓冲块中。然后把<span
|
||
lang=EN-US>i</span>节点内容复制到缓冲块的相应位置处。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>324</span></u><span
|
||
lang=EN-US> static void <u><span style='color:blue'>write_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'>325</span></u><span
|
||
lang=EN-US> {</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>326</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'>327</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'>328</span></u><span
|
||
lang=EN-US> int block;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>329</span></u><span
|
||
lang=EN-US> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>首先锁定该<span lang=EN-US>i</span>节点，如果该<span
|
||
lang=EN-US>i</span>节点没有被修改过或者该<span lang=EN-US>i</span>节点的设备号等于零，则解锁该</p>
|
||
|
||
<p class=a><span lang=EN-US> // i</span>节点，并退出。对于没有被修改过的<span
|
||
lang=EN-US>i</span>节点，其内容与缓冲区中或设备中的相同。 然后</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>获取该<span lang=EN-US>i</span>节点的超级块。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>330</span></u><span
|
||
lang=EN-US> <u><span
|
||
style='color:blue'>lock_inode</span></u>(inode);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>331</span></u><span
|
||
lang=EN-US> if
|
||
(!inode->i_dirt || !inode->i_dev) {</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>332</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>unlock_inode</span></u>(inode);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>333</span></u><span
|
||
lang=EN-US>
|
||
return;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>334</span></u><span
|
||
lang=EN-US> }</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>335</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'>336</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>panic</span></u>(<i>"trying to write inode
|
||
without device"</i>);</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>该<span lang=EN-US>i</span>节点所在的设备逻辑块号<span
|
||
lang=EN-US> = (</span>启动块<span lang=EN-US> + </span>超级块<span lang=EN-US>) + i</span>节点位图占用的块数<span
|
||
lang=EN-US> + </span>逻辑块位</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>图占用的块数<span
|
||
lang=EN-US> + (i</span>节点号<span lang=EN-US>-1)/</span>每块含有的<span lang=EN-US>i</span>节点数。<span
|
||
lang=EN-US> </span>我们从设备上读取该<span lang=EN-US>i</span>节点所在的</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>逻辑块，并将该<span
|
||
lang=EN-US>i</span>节点信息复制到逻辑块对应该<span lang=EN-US>i</span>节点的项位置处。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>337</span></u><span
|
||
lang=EN-US> block = 2 +
|
||
sb->s_imap_blocks + sb->s_zmap_blocks +</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>338</span></u><span
|
||
lang=EN-US>
|
||
(inode->i_num-1)/<u><span style='color:blue'>INODES_PER_BLOCK</span></u>;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>339</span></u><span
|
||
lang=EN-US> if (!(bh=<u><span
|
||
style='color:blue'>bread</span></u>(inode->i_dev,block)))</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>340</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>panic</span></u>(<i>"unable to read i-node
|
||
block"</i>);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>341</span></u><span
|
||
lang=EN-US> ((struct <u><span
|
||
style='color:blue'>d_inode</span></u> *)bh->b_data)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>342</span></u><span
|
||
lang=EN-US>
|
||
[(inode->i_num-1)%<u><span style='color:blue'>INODES_PER_BLOCK</span></u>] =</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>343</span></u><span
|
||
lang=EN-US>
|
||
*(struct <u><span style='color:blue'>d_inode</span></u> *)inode;</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>然后置缓冲区已修改标志，而<span
|
||
lang=EN-US>i</span>节点内容已经与缓冲区中的一致，因此修改标志置零。然后</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>释放该含有<span lang=EN-US>i</span>节点的缓冲区，并解锁该<span
|
||
lang=EN-US>i</span>节点。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>344</span></u><span
|
||
lang=EN-US> bh->b_dirt=1;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>345</span></u><span
|
||
lang=EN-US> inode->i_dirt=0;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>346</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'>347</span></u><span
|
||
lang=EN-US> <u><span
|
||
style='color:blue'>unlock_inode</span></u>(inode);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>348</span></u><span
|
||
lang=EN-US> }</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>349</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>
|
||
|
||
</div>
|
||
|
||
</body>
|
||
|
||
</html>
|