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<li class="toctree-l2"><a class="reference internal" href="../chapter3/2task-switching.html">任务切换</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../chapter3/5exercise.html">chapter3练习</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../chapter4/3sv39-implementation-1.html">实现 SV39 多级页表机制（上）</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../chapter4/4sv39-implementation-2.html">实现 SV39 多级页表机制（下）</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../chapter4/5kernel-app-spaces.html">内核与应用的地址空间</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../chapter4/7exercise.html">chapter4练习</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../chapter5/1process.html">与进程有关的重要系统调用</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../chapter5/2core-data-structures.html">进程管理的核心数据结构</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../chapter5/3implement-process-mechanism.html">进程管理机制的设计实现</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../chapter5/4exercise.html">chapter5练习</a></li>
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<li class="toctree-l1 current has-children"><a class="reference internal" href="index.html">第六章：文件系统与I/O重定向</a><input checked="" class="toctree-checkbox" id="toctree-checkbox-14" name="toctree-checkbox-14" role="switch" type="checkbox"/><label for="toctree-checkbox-14"><div class="visually-hidden">Toggle child pages in navigation</div><i class="icon"><svg><use href="#svg-arrow-right"></use></svg></i></label><ul class="current">
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<li class="toctree-l2"><a class="reference internal" href="2fs-implementation-1.html">简易文件系统 easy-fs (上)</a></li>
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<li class="toctree-l2"><a class="reference internal" href="3using-easy-fs-in-kernel.html">在内核中使用 easy-fs</a></li>
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</li>
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<p class="caption" role="heading"><span class="caption-text">附录</span></p>
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<ul>
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<li class="toctree-l1 has-children"><a class="reference internal" href="../appendix-a/index.html">附录 A：Rust 系统编程资料</a><input class="toctree-checkbox" id="toctree-checkbox-17" name="toctree-checkbox-17" role="switch" type="checkbox"/><label for="toctree-checkbox-17"><div class="visually-hidden">Toggle child pages in navigation</div><i class="icon"><svg><use href="#svg-arrow-right"></use></svg></i></label><ul class="simple">
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<li class="toctree-l1"><a class="reference internal" href="../appendix-d/index.html">附录 D：RISC-V相关信息</a></li>
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<p class="caption" role="heading"><span class="caption-text">开发注记</span></p>
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<div class="section" id="id1">
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<h1>引言<a class="headerlink" href="#id1" title="永久链接至标题">¶</a></h1>
|
||
<div class="section" id="id2">
|
||
<h2>本章导读<a class="headerlink" href="#id2" title="永久链接至标题">¶</a></h2>
|
||
<p>本章我们将实现一个简单的文件系统 – easyfs，能够对 <strong>持久存储设备</strong> (Persistent Storage) I/O 资源进行管理；将设计两种文件：常规文件和目录文件，它们均以文件系统所维护的 <strong>磁盘文件</strong> 形式被组织并保存在持久存储设备上。</p>
|
||
</div>
|
||
<div class="section" id="id3">
|
||
<h2>实践体验<a class="headerlink" href="#id3" title="永久链接至标题">¶</a></h2>
|
||
<div class="admonition note">
|
||
<p class="admonition-title">注解</p>
|
||
<p>基于github classroom的开发方式</p>
|
||
<p>基于github classroom，可方便建立开发用的git repository，并可基于github的 codespace （在线版ubuntu +vscode）在线开发使用。整个开发环境仅仅需要一个网络浏览器。</p>
|
||
<ol class="arabic simple">
|
||
<li><p>在网络浏览器中用自己的 github id 登录 github.com</p></li>
|
||
<li><p>接收 <a class="reference external" href="https://classroom.github.com/a/94eMW8zi">第四个实验(os6)的github classroom在线邀请</a> ，根据提示一路选择OK即可。</p></li>
|
||
<li><p>完成第二步后，你的第四个实验的 github repository 会被自动建立好，点击此github repository的链接，就可看到你要完成的第一个实验了。</p></li>
|
||
<li><p>在你的第四个实验的网页的中上部可以看到一个醒目的 <cite>code</cite> 绿色按钮，点击后，可以进一步看到 <cite>codespace</cite> 标签和醒目的 <cite>create codesapce on main</cite> 绿色按钮。请点击这个绿色按钮，就可以进入到在线的ubuntu +vscode环境中</p></li>
|
||
<li><p>再按照下面的环境安装提示在vscode的 <cite>console</cite> 中安装配置开发环境：rustc，qemu等工具。注：也可在vscode的 <cite>console</cite> 中执行 <code class="docutils literal notranslate"><span class="pre">make</span> <span class="pre">codespaces_setenv</span></code> 来自动安装配置开发环境（执行``sudo``需要root权限，仅需要执行一次）。</p></li>
|
||
<li><p>在vscode的 <cite>console</cite> 中执行 <cite>make setupclassroom_test6</cite> （该命令仅执行一次）配置githubclassroom 自动评分功能。</p></li>
|
||
<li><p>然后就可以基于在线vscode进行开发、运行、提交等完整的实验过程了。</p></li>
|
||
</ol>
|
||
<p>上述的3，4，5步不是必须的，你也可以线下本地开发。</p>
|
||
<p>注：如果是本地的ubuntu中建立开发环境，可在shell中执行 <code class="docutils literal notranslate"><span class="pre">make</span> <span class="pre">ubuntu_local_setenv</span></code> 来自动安装配置开发环境（执行``sudo``需要root权限，仅需要执行一次）。</p>
|
||
</div>
|
||
<p>获取本章代码：</p>
|
||
<div class="highlight-console notranslate"><div class="highlight"><pre><span></span><span class="gp">$ </span>git clone https://github.com/LearningOS/rust-based-os-comp2022.git
|
||
<span class="gp">$ </span><span class="nb">cd</span> rust-based-os-comp2022/
|
||
<span class="gp">$ </span>make setupclassroom_test6 //注意：这一步很重要，是用于github classroom自动评测你的工作。这一步只需在首次克隆项目仓库时执行一次，以后一般就不用执行了，除非 .github/workflows/classroom.yml发生了变化。
|
||
</pre></div>
|
||
</div>
|
||
<p>在 qemu 模拟器上运行本章代码参考框架：</p>
|
||
<div class="highlight-console notranslate"><div class="highlight"><pre><span></span><span class="gp">$ </span><span class="nb">cd</span> os6-ref
|
||
<span class="gp">$ </span>make run
|
||
</pre></div>
|
||
</div>
|
||
<p>内核初始化完成之后就会进入shell程序，在这里我们运行一下本章的测例 <code class="docutils literal notranslate"><span class="pre">ch6b_filetest_simple</span></code> ：</p>
|
||
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span>>> ch6b_filetest_simple
|
||
file_test passed!
|
||
Shell: Process 2 exited with code 0
|
||
>>
|
||
</pre></div>
|
||
</div>
|
||
<p>它会将 <code class="docutils literal notranslate"><span class="pre">Hello,</span> <span class="pre">world!</span></code> 输出到另一个文件 <code class="docutils literal notranslate"><span class="pre">filea</span></code> ，并读取里面的内容确认输出正确。我们也可以通过命令行工具 <code class="docutils literal notranslate"><span class="pre">ch6b_cat</span></code> 来查看 <code class="docutils literal notranslate"><span class="pre">filea</span></code> 中的内容：</p>
|
||
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span>>> ch6b_cat
|
||
Hello, world!
|
||
Shell: Process 2 exited with code 0
|
||
>>
|
||
</pre></div>
|
||
</div>
|
||
</div>
|
||
<div class="section" id="easy-fs-lab4-os6">
|
||
<h2>easy-fs和 <a class="reference external" href="https://github.com/LearningOS/rust-based-os-comp2022/tree/main/os6-ref">lab4(os6)参考框架:</a><a class="headerlink" href="#easy-fs-lab4-os6" title="永久链接至标题">¶</a></h2>
|
||
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="linenos"> 1</span>├── easy-fs(新增：从内核中独立出来的一个简单的文件系统 EasyFileSystem 的实现)
|
||
<span class="linenos"> 2</span>│ ├── Cargo.toml
|
||
<span class="linenos"> 3</span>│ └── src
|
||
<span class="linenos"> 4</span>│ ├── bitmap.rs(位图抽象)
|
||
<span class="linenos"> 5</span>│ ├── block_cache.rs(块缓存层，将块设备中的部分块缓存在内存中)
|
||
<span class="linenos"> 6</span>│ ├── block_dev.rs(声明块设备抽象接口 BlockDevice，需要库的使用者提供其实现)
|
||
<span class="linenos"> 7</span>│ ├── efs.rs(实现整个 EasyFileSystem 的磁盘布局)
|
||
<span class="linenos"> 8</span>│ ├── layout.rs(一些保存在磁盘上的数据结构的内存布局)
|
||
<span class="linenos"> 9</span>│ ├── lib.rs
|
||
<span class="linenos">10</span>│ └── vfs.rs(提供虚拟文件系统的核心抽象，即索引节点 Inode)
|
||
<span class="linenos">11</span>├── easy-fs-fuse(新增：将当前 OS 上的应用可执行文件按照 easy-fs 的格式进行打包)
|
||
<span class="linenos">12</span>│ ├── Cargo.toml
|
||
<span class="linenos">13</span>│ └── src
|
||
<span class="linenos">14</span>│ └── main.rs
|
||
<span class="linenos">15</span>├── os
|
||
<span class="linenos">16</span> ├── build.rs(修改：不再需要将用户态程序链接到内核中）
|
||
<span class="linenos">17</span> ├── Cargo.toml(修改：新增 Qemu 的块设备驱动依赖 crate)
|
||
<span class="linenos">18</span> ├── Makefile(修改：新增文件系统的构建流程)
|
||
<span class="linenos">19</span> └── src
|
||
<span class="linenos">20</span> ├── config.rs(修改：新增访问块设备所需的一些 MMIO 配置)
|
||
<span class="linenos">21</span> ├── ...
|
||
<span class="linenos">22</span> ├── drivers(新增：Qemu 平台的块设备驱动)
|
||
<span class="linenos">23</span> │ ├── block
|
||
<span class="linenos">24</span> │ │ ├── mod.rs(将不同平台上的块设备全局实例化为 BLOCK_DEVICE 提供给其他模块使用)
|
||
<span class="linenos">25</span> │ │ └── virtio_blk.rs(Qemu 平台的 virtio-blk 块设备)
|
||
<span class="linenos">26</span> │ └── mod.rs
|
||
<span class="linenos">27</span> ├── fs(新增：对文件系统及文件抽象)
|
||
<span class="linenos">28</span> │ ├── inode.rs(新增：将 easy-fs 提供的 Inode 抽象封装为内核看到的 OSInode
|
||
<span class="linenos">29</span> │ │ 并实现 fs 子模块的 File Trait)
|
||
<span class="linenos">30</span> │ ├── mod.rs
|
||
<span class="linenos">31</span> │ └── stdio.rs(新增：将标准输入输出也抽象为文件)
|
||
<span class="linenos">32</span> ├── loader.rs(移除：应用加载器 loader 子模块，本章开始从文件系统中加载应用)
|
||
<span class="linenos">33</span> ├── mm
|
||
<span class="linenos">34</span> │ ├── address.rs
|
||
<span class="linenos">35</span> │ ├── frame_allocator.rs
|
||
<span class="linenos">36</span> │ ├── heap_allocator.rs
|
||
<span class="linenos">37</span> │ ├── memory_set.rs(修改：在创建地址空间的时候插入 MMIO 虚拟页面)
|
||
<span class="linenos">38</span> │ ├── mod.rs
|
||
<span class="linenos">39</span> │ └── page_table.rs(新增：应用地址空间的缓冲区抽象 UserBuffer 及其迭代器实现)
|
||
<span class="linenos">40</span> ├── syscall
|
||
<span class="linenos">41</span> │ ├── fs.rs(修改：新增 sys_open，修改sys_read、sys_write)
|
||
<span class="linenos">42</span> │ ├── mod.rs
|
||
<span class="linenos">43</span> │ └── process.rs(修改：sys_exec 改为从文件系统中加载 ELF)
|
||
<span class="linenos">44</span> ├── task
|
||
<span class="linenos">45</span> ├── context.rs
|
||
<span class="linenos">46</span> ├── manager.rs
|
||
<span class="linenos">47</span> ├── mod.rs(修改：初始进程 INITPROC 的初始化)
|
||
<span class="linenos">48</span> ├── pid.rs
|
||
<span class="linenos">49</span> ├── processor.rs
|
||
<span class="linenos">50</span> ├── switch.rs
|
||
<span class="linenos">51</span> ├── switch.S
|
||
<span class="linenos">52</span> └── task.rs(修改：在任务控制块中加入文件描述符表的相关机制)
|
||
<span class="linenos">53</span>
|
||
<span class="linenos">54</span>cloc easy-fs os
|
||
<span class="linenos">55</span>-------------------------------------------------------------------------------
|
||
<span class="linenos">56</span>Language files blank comment code
|
||
<span class="linenos">57</span>-------------------------------------------------------------------------------
|
||
<span class="linenos">58</span>Rust 41 306 418 3349
|
||
<span class="linenos">59</span>Assembly 4 53 26 526
|
||
<span class="linenos">60</span>make 1 13 4 48
|
||
<span class="linenos">61</span>TOML 2 4 2 23
|
||
<span class="linenos">62</span>-------------------------------------------------------------------------------
|
||
<span class="linenos">63</span>SUM: 48 376 450 3946
|
||
<span class="linenos">64</span>-------------------------------------------------------------------------------
|
||
</pre></div>
|
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