2898 lines
106 KiB
HTML
2898 lines
106 KiB
HTML
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<head>
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tt
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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{mso-style-name:表7;
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|
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{mso-style-name:列表8;
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|
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{mso-style-name:列表9;
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{mso-style-name:图说明9;
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{mso-style-name:列表10;
|
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|
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{mso-style-name:图说明10;
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|
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{mso-style-name:列表11;
|
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|
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{mso-style-name:图说明11;
|
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|
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{mso-style-name:表11;
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|
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|
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{mso-style-name:图说明13;
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|
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|
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|
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|
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{mso-style-name:"图说明13 Char";
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|
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|
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|
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{mso-style-name:附录2;
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|
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|
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{mso-style-name:附录3;
|
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|
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{mso-style-name:"标题 3 Char";
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|
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|
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|
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|
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|
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|
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|
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|
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{mso-style-name:"标题 4 Char";
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|
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|
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|
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|
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|
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{mso-style-name:参考标题;
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|
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{mso-style-name:索引标题1;
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|
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|
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|
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|
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|
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|
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{mso-style-name:正文代码;
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span.Char1
|
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{mso-style-name:"正文代码 Char";
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|
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{mso-style-name:表14;
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|
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|
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|
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|
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|
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|
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span.14Char
|
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{mso-style-name:"图说明14 Char";
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|
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|
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|
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|
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|
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|
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|
||
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|
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|
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|
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|
||
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|
||
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|
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|
||
{mso-style-name:"批注文字 Char";
|
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mso-style-link:批注文字;
|
||
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|
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|
||
{mso-style-name:"页眉 Char";
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|
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|
||
{mso-style-name:"页脚 Char";
|
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mso-style-link:页脚;
|
||
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|
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span.Chare
|
||
{mso-style-name:"日期 Char";
|
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mso-style-link:日期;
|
||
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|
||
span.HTMLChar
|
||
{mso-style-name:"HTML 预设格式 Char\,HTML 预先格式化 Char\,HTML 预先格式化1 Char\,HTML 预先格式化2 Char\,HTML 预先格式化3 Char";
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|
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|
||
{mso-style-name:"批注主题 Char";
|
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|
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|
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span.Charf0
|
||
{mso-style-name:"批注框文本 Char";
|
||
mso-style-link:批注框文本;
|
||
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|
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|
||
{font-size:10.0pt;}
|
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/* Page Definitions */
|
||
@page WordSection1
|
||
{size:595.3pt 841.9pt;
|
||
margin:72.0pt 54.0pt 72.0pt 54.0pt;
|
||
layout-grid:15.6pt;}
|
||
div.WordSection1
|
||
{page:WordSection1;}
|
||
/* List Definitions */
|
||
ol
|
||
{margin-bottom:0cm;}
|
||
ul
|
||
{margin-bottom:0cm;}
|
||
-->
|
||
</style>
|
||
|
||
</head>
|
||
|
||
<body lang=ZH-CN link=blue vlink=purple style='text-justify-trim:punctuation'>
|
||
|
||
<div class=WordSection1 style='layout-grid:15.6pt'>
|
||
|
||
<p class=ab><a name="_Toc53320619"><span style='font-family:黑体'>程序</span><span
|
||
lang=EN-US>9-3 linux/kernel/blk_drv/ll_rw_blk.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/kernel/blk_dev/ll_rw.c</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>3</span></u> <b><i> *</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>4</span></u> <b><i> *
|
||
(C) 1991 Linus Torvalds</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>5</span></u> <b><i> */</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>6</span></u> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>7</span></u> <b><i>/*</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>8</span></u> <b><i> *
|
||
This handles all read/write requests to block devices</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>9</span></u> <b><i> */</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>10</span></u>
|
||
#include <errno.h> // </span>错误号头文件。包含系统中各种出错号。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>11</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>数据等。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>12</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'>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> <u><span style='color:blue'>15</span></u>
|
||
#include "<u><span style='color:blue'>blk.h</span></u>"
|
||
// </span>块设备头文件。定义请求数据结构、块设备数据结构和宏等信息。</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> <b><i>/*</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>18</span></u> <b><i> *
|
||
The request-struct contains all necessary data</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>19</span></u> <b><i> *
|
||
to load a nr of sectors into memory</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>20</span></u> <b><i> */</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> /*</span></p>
|
||
|
||
<p class=a><span lang=EN-US> * </span>请求结构中含有加载<span
|
||
lang=EN-US>nr</span>个扇区数据到内存中去的所有必须的信息。</p>
|
||
|
||
<p class=a><span lang=EN-US> */</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>请求项数组队列。共有<span
|
||
lang=EN-US>NR_REQUEST = 32</span>个请求项。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>21</span></u>
|
||
struct <u><span style='color:blue'>request</span></u> <u><span
|
||
style='color:blue'>request</span></u>[<u><span style='color:blue'>NR_REQUEST</span></u>];</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>22</span></u> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>23</span></u> <b><i>/*</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>24</span></u> <b><i> *
|
||
used to wait on when there are no free requests</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>25</span></u> <b><i> */</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> /*</span></p>
|
||
|
||
<p class=a><span lang=EN-US> * </span>是用于在请求数组没有空闲项时进程的临时等待处。</p>
|
||
|
||
<p class=a><span lang=EN-US> */</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>26</span></u>
|
||
struct <u><span style='color:blue'>task_struct</span></u> * <u><span
|
||
style='color:blue'>wait_for_request</span></u> = <u><span style='color:blue'>NULL</span></u>;</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>27</span></u> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>28</span></u> <b><i>/*
|
||
blk_dev_struct is:</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>29</span></u> <b><i> *
|
||
do_request-address</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>30</span></u> <b><i> *
|
||
next-request</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>31</span></u> <b><i> */</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> /* blk_dev_struct</span>块设备结构是：（参见文件<span
|
||
lang=EN-US>kernel/blk_drv/blk.h</span>，第<span lang=EN-US>45</span>行）</p>
|
||
|
||
<p class=a><span lang=EN-US>
|
||
* do_request-address //
|
||
</span>对应主设备号的请求处理程序指针。</p>
|
||
|
||
<p class=a><span lang=EN-US> *
|
||
current-request // </span>该设备的下一个请求。</p>
|
||
|
||
<p class=a><span lang=EN-US> */</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>块设备数组。该数组使用主设备号作为索引。实际内容将在各块设备驱动程序初始化时填入。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>例如，硬盘驱动程序初始化时（<span
|
||
lang=EN-US>hd.c</span>，<span lang=EN-US>343</span>行），第一条语句即用于设置<span
|
||
lang=EN-US>blk_dev[3]</span>的内容。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>32</span></u>
|
||
struct <u><span style='color:blue'>blk_dev_struct</span></u> <u><span
|
||
style='color:blue'>blk_dev</span></u>[<u><span style='color:blue'>NR_BLK_DEV</span></u>]
|
||
= {</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>33</span></u>
|
||
{ <u><span style='color:blue'>NULL</span></u>, <u><span style='color:blue'>NULL</span></u>
|
||
}, <b><i>/* no_dev */</i></b>
|
||
// 0 - </span>无设备。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>34</span></u>
|
||
{ <u><span style='color:blue'>NULL</span></u>, <u><span style='color:blue'>NULL</span></u>
|
||
}, <b><i>/* dev mem */</i></b>
|
||
// 1 - </span>内存。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>35</span></u>
|
||
{ <u><span style='color:blue'>NULL</span></u>, <u><span style='color:blue'>NULL</span></u>
|
||
}, <b><i>/* dev fd */</i></b>
|
||
// 2 - </span>软驱设备。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>36</span></u>
|
||
{ <u><span style='color:blue'>NULL</span></u>, <u><span style='color:blue'>NULL</span></u>
|
||
}, <b><i>/* dev hd */</i></b>
|
||
// 3 - </span>硬盘设备。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>37</span></u>
|
||
{ <u><span style='color:blue'>NULL</span></u>, <u><span style='color:blue'>NULL</span></u>
|
||
}, <b><i>/* dev ttyx */</i></b>
|
||
// 4 - ttyx</span>设备。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>38</span></u>
|
||
{ <u><span style='color:blue'>NULL</span></u>, <u><span style='color:blue'>NULL</span></u>
|
||
}, <b><i>/* dev tty */</i></b>
|
||
// 5 - tty</span>设备。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>39</span></u>
|
||
{ <u><span style='color:blue'>NULL</span></u>, <u><span style='color:blue'>NULL</span></u>
|
||
} <b><i>/* dev lp */</i></b>
|
||
// 6 - lp</span>打印机设备。</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> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>42</span></u> <b><i>/*</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>43</span></u> <b><i> *
|
||
blk_size contains the size of all block-devices:</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>44</span></u> <b><i> *</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>45</span></u> <b><i> *
|
||
blk_size[MAJOR][MINOR]</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>46</span></u> <b><i> *</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>47</span></u> <b><i> *
|
||
if (!blk_size[MAJOR]) then no minor size checking is done.</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>48</span></u> <b><i> */</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> /*</span></p>
|
||
|
||
<p class=a><span lang=EN-US> * blk_size</span>数组含有所有块设备的大小（块总数）：</p>
|
||
|
||
<p class=a><span lang=EN-US> * blk_size[MAJOR][MINOR]</span></p>
|
||
|
||
<p class=a><span lang=EN-US> * </span>如果<span
|
||
lang=EN-US> (!blk_size[MAJOR])</span>，则不必检测子设备的块总数。</p>
|
||
|
||
<p class=a><span lang=EN-US> */</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。该总块数数组每一</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>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'>49</span></u> int
|
||
* <u><span style='color:blue'>blk_size</span></u>[<u><span style='color:blue'>NR_BLK_DEV</span></u>]
|
||
= { <u><span style='color:blue'>NULL</span></u>, <u><span style='color:blue'>NULL</span></u>,
|
||
};</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>50</span></u> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>锁定指定缓冲块。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>如果指定的缓冲块已经被其他任务锁定，则使自己睡眠（不可中断地等待），直到被执行解</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>锁缓冲块的任务明确地唤醒。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>51</span></u>
|
||
static inline void <u><span style='color:blue'>lock_buffer</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'>52</span></u> {</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>53</span></u>
|
||
<u><span style='color:blue'>cli</span></u>();
|
||
// </span>清中断许可。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>54</span></u>
|
||
while (bh->b_lock)
|
||
// </span>如果缓冲区已被锁定则睡眠，直到缓冲区解锁。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>55</span></u>
|
||
<u><span style='color:blue'>sleep_on</span></u>(&bh->b_wait);</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>56</span></u>
|
||
bh->b_lock=1;
|
||
// </span>立刻锁定该缓冲区。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>57</span></u>
|
||
<u><span style='color:blue'>sti</span></u>();
|
||
// </span>开中断。</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> // </span>释放（解锁）锁定的缓冲区。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>该函数与<span lang=EN-US>blk.h</span>文件中的同名函数完全一样。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>60</span></u>
|
||
static inline void <u><span style='color:blue'>unlock_buffer</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'>61</span></u> {</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>62</span></u>
|
||
if (!bh->b_lock)
|
||
// </span>如果该缓冲区没有被锁定，则打印出错信息。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>63</span></u>
|
||
<u><span style='color:blue'>printk</span></u>(<i>"ll_rw_block.c: buffer
|
||
not locked\n\r"</i>);</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>64</span></u>
|
||
bh->b_lock = 0;
|
||
// </span>清锁定标志。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>65</span></u>
|
||
<u><span style='color:blue'>wake_up</span></u>(&bh->b_wait);
|
||
// </span>唤醒等待该缓冲区的任务。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>66</span></u> }</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>67</span></u> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>68</span></u> <b><i>/*</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>69</span></u> <b><i> *
|
||
add-request adds a request to the linked list.</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>70</span></u> <b><i> *
|
||
It disables interrupts so that it can muck with the</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>71</span></u> <b><i> *
|
||
request-lists in peace.</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>72</span></u> <b><i> *</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>73</span></u> <b><i> *
|
||
Note that swapping requests always go before other requests,</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>74</span></u> <b><i> *
|
||
and are done in the order they appear.</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>75</span></u> <b><i> */</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> /*</span></p>
|
||
|
||
<p class=a><span lang=EN-US> * add-request()</span>向链表中加入一项请求项。它会关闭中断，</p>
|
||
|
||
<p class=a><span lang=EN-US> * </span>这样就能安全地处理请求链表了。</p>
|
||
|
||
<p class=a><span lang=EN-US> * </span></p>
|
||
|
||
<p class=a><span lang=EN-US> * </span>注意，交换请求总是在其他请求之前操作，并且以它们出</p>
|
||
|
||
<p class=a><span lang=EN-US> * </span>现的顺序完成。</p>
|
||
|
||
<p class=a><span lang=EN-US> */</span></p>
|
||
|
||
<p class=a><span lang=EN-US> //// </span>向链表中加入请求项。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>参数<span lang=EN-US>dev</span>是指定块设备结构指针，该结构中有处理请求项函数指针和当前正在请求项指针；</p>
|
||
|
||
<p class=a><span lang=EN-US> // req</span>是已设置好内容的请求项结构指针。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>本函数把已经设置好的请求项<span
|
||
lang=EN-US>req</span>添加到指定设备的请求项链表中。如果该设备的当前请求</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>请求项指针为空，则可以设置<span
|
||
lang=EN-US>req</span>为当前请求项并立刻调用设备请求项处理函数。否则就把</p>
|
||
|
||
<p class=a><span lang=EN-US> // req</span>请求项插入到该请求项链表中。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>76</span></u>
|
||
static void <u><span style='color:blue'>add_request</span></u>(struct <u><span
|
||
style='color:blue'>blk_dev_struct</span></u> * dev, struct <u><span
|
||
style='color:blue'>request</span></u> * req)</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>77</span></u> {</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>78</span></u>
|
||
struct <u><span style='color:blue'>request</span></u> * tmp;</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>79</span></u> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>首先再进一步对参数提供的请求项的指针和标志作初始设置。置空请求项中的下一请求项指</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>针，关中断并清除请求项相关缓冲区脏标志。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>80</span></u>
|
||
req->next = <u><span style='color:blue'>NULL</span></u>;</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>81</span></u>
|
||
<u><span style='color:blue'>cli</span></u>();
|
||
// </span>关中断。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>82</span></u>
|
||
if (req->bh)</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>83</span></u>
|
||
req->bh->b_dirt = 0;
|
||
// </span>清缓冲区“脏”标志。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>然后查看指定设备是否有当前请求项，即查看设备是否正忙。如果指定设备<span
|
||
lang=EN-US>dev</span>当前请求项</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>（<span lang=EN-US>current_request</span>）子段为空，则表示目前该设备没有请求项，本次是第<span
|
||
lang=EN-US>1</span>个请求项，也是</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>唯一的一个。因此可将块设备当前请求指针直接指向该请求项，并立刻执行相应设备的请求</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>函数。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>84</span></u>
|
||
if (!(tmp = dev->current_request)) {</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>85</span></u>
|
||
dev->current_request = req;</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>86</span></u>
|
||
<u><span style='color:blue'>sti</span></u>();
|
||
// </span>开中断。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>87</span></u>
|
||
(dev->request_fn)(); // </span>执行请求函数，对于硬盘是<span
|
||
lang=EN-US>do_hd_request()</span>。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>88</span></u>
|
||
return;</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>89</span></u>
|
||
}</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>如果目前该设备已经有当前请求项在处理，则首先利用电梯算法搜索最佳插入位置，然后将</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>当前请求项插入到请求链表中。在搜索过程中，如果判断出欲插入请求项的缓冲块头指针空，</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>即没有缓冲块，那么就需要找一个项，其已经有可用的缓冲块。因此若当前插入位置（<span
|
||
lang=EN-US>tmp</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>之后）处的空闲项缓冲块头指针不空，就选择这个位置。于是退出循环并把请求项插入此处。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>最后开中断并退出函数。电梯算法的作用是让磁盘磁头的移动距离最小，从而改善（减少）</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>硬盘访问时间。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>下面<span lang=EN-US>for</span>循环中<span
|
||
lang=EN-US>if</span>语句用于把<span lang=EN-US>req</span>所指请求项与请求队列（链表）中已有的请求项作比较，</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>找出<span lang=EN-US>req</span>插入该队列的正确位置顺序。然后中断循环，并把<span
|
||
lang=EN-US>req</span>插入到该队列正确位置处。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>90</span></u>
|
||
for ( ; tmp->next ; tmp=tmp->next) {</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>91</span></u>
|
||
if (!req->bh)</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>92</span></u>
|
||
if (tmp->next->bh)</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>93</span></u>
|
||
break;</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>94</span></u>
|
||
else</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>95</span></u>
|
||
continue;</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>96</span></u>
|
||
if ((<u><span style='color:blue'>IN_ORDER</span></u>(tmp,req) ||</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>97</span></u>
|
||
!<u><span style='color:blue'>IN_ORDER</span></u>(tmp,tmp->next)) &&</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span
|
||
style='color:blue'>98</span></u>
|
||
<u><span style='color:blue'>IN</span></u><u><span style='color:blue'>_ORDER</span></u>(req,tmp->next))</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>99</span></u>
|
||
break;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>100</span></u><span
|
||
lang=EN-US> }</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>101</span></u><span
|
||
lang=EN-US>
|
||
req->next=tmp->next;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>102</span></u><span
|
||
lang=EN-US> tmp->next=req;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>103</span></u><span
|
||
lang=EN-US> <u><span
|
||
style='color:blue'>sti</span></u>();</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>104</span></u><span
|
||
lang=EN-US> }</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>105</span></u><span
|
||
lang=EN-US> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> //// </span>创建请求项并插入请求队列中。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>参数<span lang=EN-US>major</span>是主设备号；<span
|
||
lang=EN-US>rw</span>是指定命令；<span lang=EN-US>bh</span>是存放数据的缓冲区头指针。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>106</span></u><span
|
||
lang=EN-US> static void <u><span style='color:blue'>make_request</span></u>(int
|
||
major,int rw, struct <u><span style='color:blue'>buffer_head</span></u> * bh)</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><u><span lang=EN-US style='color:blue'>108</span></u><span
|
||
lang=EN-US> struct <u><span
|
||
style='color:blue'>request</span></u> * req;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>109</span></u><span
|
||
lang=EN-US> int rw_ahead;</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><u><span lang=EN-US style='color:blue'>111</span></u><span
|
||
lang=EN-US> <b><i>/* WRITEA/READA is special case - it is not really needed, so
|
||
if the */</i></b></span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>112</span></u><span
|
||
lang=EN-US> <b><i>/* buffer is locked, we just forget about it, else it's a
|
||
normal read */</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> /* WRITEA/READA</span>是一种特殊情况<span
|
||
lang=EN-US> - </span>它们并非必要，所以如果缓冲区已经上锁，<span lang=EN-US>*/</span></p>
|
||
|
||
<p class=a><span lang=EN-US> /* </span>我们就不用管它，否则的话它只是一个一般的读操作。<span
|
||
lang=EN-US> */</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>这里<span lang=EN-US>'READ'</span>和<span
|
||
lang=EN-US>'WRITE'</span>后面的<span lang=EN-US>'A'</span>字符代表英文单词<span
|
||
lang=EN-US>Ahead</span>，表示提前预读<span lang=EN-US>/</span>写数据块的意思。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>该函数首先对命令<span
|
||
lang=EN-US>READA/WRITEA</span>的情况进行一些处理。对于这两个命令，当指定的缓冲区</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>正在使用而已被上锁时，就放弃预读<span
|
||
lang=EN-US>/</span>写请求。否则就作为普通的<span lang=EN-US>READ/WRITE</span>命令进行操作。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>另外，如果参数给出的命令既不是 <span
|
||
lang=EN-US>READ</span>也不是 <span lang=EN-US>WRITE</span>，则表示内核程序有错，显示出错信</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>息并停机。注意，在修改命令之前这里已为参数是否是预读<span
|
||
lang=EN-US>/</span>写命令设置了标志<span lang=EN-US>rw_ahead</span>。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>113</span></u><span
|
||
lang=EN-US> if (rw_ahead = (rw
|
||
== <u><span style='color:blue'>READA</span></u> || rw == <u><span
|
||
style='color:blue'>WRITEA</span></u>)) {</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>114</span></u><span
|
||
lang=EN-US>
|
||
if (bh->b_lock)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>115</span></u><span
|
||
lang=EN-US>
|
||
return;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>116</span></u><span
|
||
lang=EN-US>
|
||
if (rw == <u><span style='color:blue'>READA</span></u>)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>117</span></u><span
|
||
lang=EN-US>
|
||
rw = <u><span style='color:blue'>READ</span></u>;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>118</span></u><span
|
||
lang=EN-US>
|
||
else</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>119</span></u><span
|
||
lang=EN-US>
|
||
rw = <u><span style='color:blue'>WRITE</span></u>;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>120</span></u><span
|
||
lang=EN-US> }</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>121</span></u><span
|
||
lang=EN-US> if (rw!=<u><span
|
||
style='color:blue'>READ</span></u> && rw!=<u><span style='color:blue'>WRITE</span></u>)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>122</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>panic</span></u>(<i>"Bad block dev command,
|
||
must be R/W/RA/WA"</i>);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>123</span></u><span
|
||
lang=EN-US> <u><span
|
||
style='color:blue'>lock_buffer</span></u>(bh);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>124</span></u><span
|
||
lang=EN-US> if ((rw == <u><span
|
||
style='color:blue'>WRITE</span></u> && !bh->b_dirt) || (rw == <u><span
|
||
style='color:blue'>READ</span></u> && bh->b_uptodate)) {</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>125</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>unlock_buffer</span></u>(bh);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>126</span></u><span
|
||
lang=EN-US>
|
||
return;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>127</span></u><span
|
||
lang=EN-US> }</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>128</span></u><span
|
||
lang=EN-US> repeat:</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>129</span></u><span
|
||
lang=EN-US> <b><i>/* we don't allow the write-requests to fill up the queue completely:</i></b></span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>130</span></u><span
|
||
lang=EN-US> <b><i> * we want some room for reads: they take precedence.
|
||
The last third</i></b></span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>131</span></u><span
|
||
lang=EN-US> <b><i> * of the requests are only for reads.</i></b></span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>132</span></u><span
|
||
lang=EN-US> <b><i> */</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> /* </span>我们不能让队列中全都是写请求项：我们需要为读请求保留一些空间：读操作</p>
|
||
|
||
<p class=a><span lang=EN-US> * </span>是优先的。请求队列的后三分之一空间仅用于读请求项。</p>
|
||
|
||
<p class=a><span lang=EN-US> */</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>好，现在我们必须为本函数生成并添加读<span
|
||
lang=EN-US>/</span>写请求项了。首先我们需要在请求数组中寻找到</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>一个空闲项（槽）来存放新请求项。搜索过程从请求数组末端开始。根据上述要求，对于读</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>命令请求，我们直接从队列末尾开始搜索，而对于写请求就只能从队列<span
|
||
lang=EN-US>2/3</span>处向队列头处搜</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>索空项填入。于是我们开始从后向前搜索，当请求结构<span
|
||
lang=EN-US>request</span>的设备字段<span lang=EN-US>dev</span>值 <span lang=EN-US>= -1</span>时，</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>表示该项未被占用（空闲）。如果没有一项是空闲的（此时请求项数组指针已经搜索越过头</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>部），则查看此次请求是否是提前读<span
|
||
lang=EN-US>/</span>写（<span lang=EN-US>READA</span>或<span lang=EN-US>WRITEA</span>），如果是则放弃此次请求操作。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>否则让本次请求操作先睡眠（以等待请求队列腾出空项），过一会再来搜索请求队列。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>133</span></u><span
|
||
lang=EN-US> if (rw == <u><span
|
||
style='color:blue'>READ</span></u>)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>134</span></u><span
|
||
lang=EN-US>
|
||
req = <u><span style='color:blue'>request</span></u>+<u><span style='color:
|
||
blue'>NR_REQUEST</span></u>;
|
||
// </span>对于读请求，将指针指向队列尾部。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>135</span></u><span
|
||
lang=EN-US> else</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>136</span></u><span
|
||
lang=EN-US>
|
||
req = <u><span style='color:blue'>request</span></u>+((<u><span
|
||
style='color:blue'>NR_REQUEST</span></u>*2)/3); // </span>对于写请求，指针指向队列<span
|
||
lang=EN-US>2/3</span>处。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>137</span></u><span
|
||
lang=EN-US> <b><i>/* find an empty request */</i></b>
|
||
/* </span>搜索一个空请求项<span lang=EN-US> */</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>138</span></u><span
|
||
lang=EN-US> while (--req >= <u><span
|
||
style='color:blue'>request</span></u>)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>139</span></u><span
|
||
lang=EN-US>
|
||
if (req->dev<0)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>140</span></u><span
|
||
lang=EN-US>
|
||
break;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>141</span></u><span
|
||
lang=EN-US> <b><i>/* if none found, sleep on new requests: check for rw_ahead
|
||
*/</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> /* </span>如果没有找到空闲项，则让该次新请求操作睡眠：需检查是否提前读<span
|
||
lang=EN-US>/</span>写<span lang=EN-US> */</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>142</span></u><span
|
||
lang=EN-US> if (req < <u><span
|
||
style='color:blue'>request</span></u>) {
|
||
// </span>如果已搜索到头（队列无空项），</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>143</span></u><span
|
||
lang=EN-US>
|
||
if (rw_ahead) {
|
||
// </span>则若是提前读<span lang=EN-US>/</span>写请求，则退出。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>144</span></u><span
|
||
lang=EN-US> <u><span
|
||
style='color:blue'>unlock_buffer</span></u>(bh);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>145</span></u><span
|
||
lang=EN-US>
|
||
return;</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><u><span lang=EN-US style='color:blue'>147</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>sleep_on</span></u>(&<u><span style='color:
|
||
blue'>wait_for_request</span></u>); // </span>否则就睡眠，过会再查看请求队列。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>148</span></u><span
|
||
lang=EN-US>
|
||
goto repeat;
|
||
// </span>跳转<span lang=EN-US>110</span>行。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>149</span></u><span
|
||
lang=EN-US> }</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>150</span></u><span
|
||
lang=EN-US> <b><i>/* fill up the request-info, and add it to the queue */</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> /* </span>向空闲请求项中填写请求信息，并将其加入队列中
|
||
<span lang=EN-US>*/</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // OK</span>，程序执行到这里表示已找到一个空闲请求项。
|
||
于是我们在设置好的新请求项后就调用</p>
|
||
|
||
<p class=a><span lang=EN-US> // add_request()</span>把它添加到请求队列中，立马退出。请求结构请参见<span
|
||
lang=EN-US>blk_drv/blk.h</span>，<span lang=EN-US>23</span>行。</p>
|
||
|
||
<p class=a><span lang=EN-US> // req->sector</span>是读写操作的起始扇区号，<span
|
||
lang=EN-US>req->buffer</span>是请求项存放数据的缓冲区。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>151</span></u><span
|
||
lang=EN-US> req->dev =
|
||
bh->b_dev;
|
||
// </span>设备号。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>152</span></u><span
|
||
lang=EN-US> req->cmd = rw;
|
||
// </span>命令<span lang=EN-US>(READ/WRITE)</span>。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>153</span></u><span
|
||
lang=EN-US> req->errors=0;
|
||
// </span>操作时产生的错误次数。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>154</span></u><span
|
||
lang=EN-US> req-><u><span
|
||
style='color:blue'>sector</span></u> = bh->b_blocknr<<1;
|
||
// </span>起始扇区。块号转换成扇区号<span lang=EN-US>(1</span>块<span lang=EN-US>=2</span>扇区<span
|
||
lang=EN-US>)</span>。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>155</span></u><span
|
||
lang=EN-US> req->nr_sectors
|
||
= 2;
|
||
// </span>本请求项需要读写的扇区数。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>156</span></u><span
|
||
lang=EN-US> req->buffer =
|
||
bh->b_data; // </span>请求项缓冲区指针指向需读写的数据缓冲区。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>157</span></u><span
|
||
lang=EN-US> req->waiting = <u><span
|
||
style='color:blue'>NULL</span></u>;
|
||
// </span>任务等待操作执行完成的地方。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>158</span></u><span
|
||
lang=EN-US> req->bh = bh;
|
||
// </span>缓冲块头指针。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>159</span></u><span
|
||
lang=EN-US> req->next = <u><span
|
||
style='color:blue'>NULL</span></u>;
|
||
// </span>指向下一请求项。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>160</span></u><span
|
||
lang=EN-US> <u><span
|
||
style='color:blue'>add_request</span></u>(major+<u><span style='color:blue'>blk_dev</span></u>,req);
|
||
// </span>将请求项加入队列中<span lang=EN-US>(blk_dev[major],req)</span>。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>161</span></u><span
|
||
lang=EN-US> }</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>162</span></u><span
|
||
lang=EN-US> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> //// </span>低级页面读写函数（<span
|
||
lang=EN-US>Low Level Read Write Page</span>）。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>以页面（<span lang=EN-US>4K</span>）为单位访问块设备数据，即每次读<span
|
||
lang=EN-US>/</span>写<span lang=EN-US>8</span>个扇区。参见下面<span lang=EN-US>ll_rw_blk()</span>函数。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>163</span></u><span
|
||
lang=EN-US> void <u><span style='color:blue'>ll_rw_page</span></u>(int rw, int
|
||
dev, int page, char * buffer)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>164</span></u><span
|
||
lang=EN-US> {</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>165</span></u><span
|
||
lang=EN-US> struct <u><span
|
||
style='color:blue'>request</span></u> * req;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>166</span></u><span
|
||
lang=EN-US> unsigned int major
|
||
= <u><span style='color:blue'>MAJOR</span></u>(dev);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>167</span></u><span
|
||
lang=EN-US> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>首先对函数参数的合法性进行检测。如果设备主设备号不存在或者该设备的请求操作函数不</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>存在，则显示出错信息，并返回。如果参数给出的命令既不是
|
||
<span lang=EN-US>READ</span>也不是 <span lang=EN-US>WRITE</span>，则表示</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>内核程序有错，显示出错信息并停机。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>168</span></u><span
|
||
lang=EN-US> if (major >= <u><span
|
||
style='color:blue'>NR_BLK_DEV</span></u> || !(<u><span style='color:blue'>blk_dev</span></u>[major].request_fn))
|
||
{</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>169</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>printk</span></u>(<i>"Trying to read
|
||
nonexistent block-device\n\r"</i>);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>170</span></u><span
|
||
lang=EN-US>
|
||
return;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>171</span></u><span
|
||
lang=EN-US> }</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>172</span></u><span
|
||
lang=EN-US> if (rw!=<u><span
|
||
style='color:blue'>READ</span></u> && rw!=<u><span style='color:blue'>WRITE</span></u>)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>173</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>panic</span></u>(<i>"Bad block dev command,
|
||
must be R/W"</i>);</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>在参数检测操作完成后，我们现在需要为本次操作建立请求项。首先我们需要在请求数组中</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>寻找到一个空闲项（槽）来存放新请求项。搜索过程从请求数组末端开始。于是我们开始从</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>后向前搜索，当请求结构<span
|
||
lang=EN-US>request</span>的设备字段<span lang=EN-US>dev</span>值<span lang=EN-US>
|
||
<0 </span>时，表示该项未被占用（空闲）。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>如果没有一项是空闲的（此时请求项数组指针已经搜索越过头部），则让本次请求操作先睡</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>眠（以等待请求队列腾出空项），过一会再来搜索请求队列。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>174</span></u><span
|
||
lang=EN-US> repeat:</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>175</span></u><span
|
||
lang=EN-US> req = <u><span
|
||
style='color:blue'>request</span></u>+<u><span style='color:blue'>NR_REQUEST</span></u>;
|
||
// </span>将指针指向队列尾部。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>176</span></u><span
|
||
lang=EN-US> while (--req >= <u><span
|
||
style='color:blue'>request</span></u>)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>177</span></u><span
|
||
lang=EN-US>
|
||
if (req->dev<0)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>178</span></u><span
|
||
lang=EN-US>
|
||
break;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>179</span></u><span
|
||
lang=EN-US> if (req < <u><span
|
||
style='color:blue'>request</span></u>) {</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>180</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>sleep_on</span></u>(&<u><span style='color:
|
||
blue'>wait_for_request</span></u>); // </span>睡眠，过会再查看请求队列。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>181</span></u><span
|
||
lang=EN-US>
|
||
goto repeat;
|
||
// </span>跳转到<span lang=EN-US>174</span>行去重新搜索。</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> <b><i>/* fill up the request-info, and add it to the queue */</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> /* </span>向空闲请求项中填写请求信息，并将其加入队列中
|
||
<span lang=EN-US>*/</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // OK</span>，程序执行到这里表示已找到一个空闲请求项。
|
||
于是我们设置好新请求项，把当前进程</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>置为不可中断睡眠中断后，就去调用<span
|
||
lang=EN-US>add_request()</span>把它添加到请求队列中，然后直接调用</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>调度函数让当前进程睡眠等待页面从交换设备中读入。这里不象<span
|
||
lang=EN-US>make_request()</span>函数那样</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>直接退出函数而调用了<span
|
||
lang=EN-US>schedule()</span>，是因为<span lang=EN-US>make_request()</span>函数仅读<span
|
||
lang=EN-US>2</span>个扇区数据。而这</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>里需要对交换设备读<span
|
||
lang=EN-US>/</span>写<span lang=EN-US>8</span>个扇区，需要花较长的时间。因此当前进程肯定需要等待而睡眠。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>因此这里直接就让进程去睡眠了，省得在程序其他地方还要进行这些判断操作。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>184</span></u><span
|
||
lang=EN-US> req->dev = dev;
|
||
// </span>设备号。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>185</span></u><span
|
||
lang=EN-US> req->cmd = rw;
|
||
// </span>命令<span lang=EN-US>(READ/WRITE)</span>。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>186</span></u><span
|
||
lang=EN-US> req->errors = 0;
|
||
// </span>读写操作错误计数。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>187</span></u><span
|
||
lang=EN-US> req-><u><span
|
||
style='color:blue'>sector</span></u> = page<<3;
|
||
// </span>起始读写扇区。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>188</span></u><span
|
||
lang=EN-US> req->nr_sectors
|
||
= 8;
|
||
// </span>读写扇区数。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>189</span></u><span
|
||
lang=EN-US> req->buffer =
|
||
buffer;
|
||
// </span>数据缓冲区。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>190</span></u><span
|
||
lang=EN-US> req->waiting = <u><span
|
||
style='color:blue'>current</span></u>;
|
||
// </span>当前进程进入该请求等待队列。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>191</span></u><span
|
||
lang=EN-US> req->bh = <u><span
|
||
style='color:blue'>NULL</span></u>;
|
||
// </span>无缓冲块头指针（不用高速缓冲）。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>192</span></u><span
|
||
lang=EN-US> req->next = <u><span
|
||
style='color:blue'>NULL</span></u>;
|
||
// </span>下一个请求项指针。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>193</span></u><span
|
||
lang=EN-US> <u><span
|
||
style='color:blue'>current</span></u>-><u><span style='color:blue'>state</span></u>
|
||
= <u><span style='color:blue'>TASK_UNINTERRUPTIBLE</span></u>;
|
||
// </span>置为不可中断状态。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>194</span></u><span
|
||
lang=EN-US> <u><span
|
||
style='color:blue'>add_request</span></u>(major+<u><span style='color:blue'>blk_dev</span></u>,req);
|
||
// </span>将请求项加入队列中。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>195</span></u><span
|
||
lang=EN-US> <u><span
|
||
style='color:blue'>schedule</span></u>();</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><u><span lang=EN-US style='color:blue'>197</span></u><span
|
||
lang=EN-US> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> //// </span>低级数据块读写函数（<span
|
||
lang=EN-US>Low Level Read Write Block</span>）。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>该函数是块设备驱动程序与系统其他部分的接口函数。通常在<span
|
||
lang=EN-US>fs/buffer.c</span>程序中被调用。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>主要功能是创建块设备读写请求项并插入到指定块设备请求队列中。实际的读写操作则是</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>由设备的<span lang=EN-US>request_fn()</span>函数完成。对于硬盘操作，该函数是<span
|
||
lang=EN-US>do_hd_request()</span>；对于软盘</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>操作该函数是<span
|
||
lang=EN-US>do_fd_request()</span>；对于虚拟盘则是<span lang=EN-US>do_rd_request()</span>。
|
||
另外，在调用该函</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>数之前，调用者需要首先把读<span
|
||
lang=EN-US>/</span>写块设备的信息保存在缓冲块头结构中，如设备号、块号。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>参数：<span lang=EN-US>rw
|
||
– READ</span>、<span lang=EN-US>READA</span>、<span lang=EN-US>WRITE</span>或<span
|
||
lang=EN-US>WRITEA</span>是命令；<span lang=EN-US>bh – </span>数据缓冲块头指针。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>198</span></u><span
|
||
lang=EN-US> void <u><span style='color:blue'>ll_rw_block</span></u>(int rw,
|
||
struct <u><span style='color:blue'>buffer_head</span></u> * bh)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>199</span></u><span
|
||
lang=EN-US> {</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>200</span></u><span
|
||
lang=EN-US> unsigned int major;
|
||
// </span>主设备号（对于硬盘是<span lang=EN-US>3</span>）。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>201</span></u><span
|
||
lang=EN-US> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>如果设备主设备号不存在或者该设备的请求操作函数不存在，则显示出错信息，并返回。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>否则创建请求项并插入请求队列。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>202</span></u><span
|
||
lang=EN-US> if ((major=<u><span
|
||
style='color:blue'>MAJOR</span></u>(bh->b_dev)) >= <u><span
|
||
style='color:blue'>NR_BLK_DEV</span></u> ||</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>203</span></u><span
|
||
lang=EN-US> !(<u><span
|
||
style='color:blue'>blk_dev</span></u>[major].request_fn)) {</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>204</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>printk</span></u>(<i>"Trying to read
|
||
nonexistent block-device\n\r"</i>);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>205</span></u><span
|
||
lang=EN-US>
|
||
return;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>206</span></u><span
|
||
lang=EN-US> }</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>207</span></u><span
|
||
lang=EN-US> <u><span
|
||
style='color:blue'>make_request</span></u>(major,rw,bh);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>208</span></u><span
|
||
lang=EN-US> }</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>209</span></u><span
|
||
lang=EN-US> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> //// </span>块设备初始化函数，由初始化程序<span
|
||
lang=EN-US>main.c</span>调用。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>初始化请求数组，将所有请求项置为空闲项<span
|
||
lang=EN-US>(dev = -1)</span>。有<span lang=EN-US>32</span>项<span lang=EN-US>(NR_REQUEST
|
||
= 32)</span>。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>210</span></u><span
|
||
lang=EN-US> void <u><span style='color:blue'>blk_dev_init</span></u>(void)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>211</span></u><span
|
||
lang=EN-US> {</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>212</span></u><span
|
||
lang=EN-US> int i;</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><u><span lang=EN-US style='color:blue'>214</span></u><span
|
||
lang=EN-US> for (i=0 ; i<<u><span
|
||
style='color:blue'>NR_REQUEST</span></u> ; i++) {</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>215</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>request</span></u>[i].dev = -1;</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'>request</span></u>[i].next = <u><span
|
||
style='color:blue'>NULL</span></u>;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>217</span></u><span
|
||
lang=EN-US> }</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>218</span></u><span
|
||
lang=EN-US> }</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>219</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>
|