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| <div class="section" id="other-file-systems"> |
| <h1>Other File Systems<a class="headerlink" href="#other-file-systems" title="Permalink to this headline">¶</a></h1> |
| <p>Libraries use Mynewt’s file system abstraction layer (<code class="docutils literal notranslate"><span class="pre">fs/fs</span></code>) for all |
| file operations. Because clients use an abstraction layer, the |
| underlying file system can be swapped out without affecting client code. |
| This page documents the procedure for plugging a custom file system into |
| the Mynewt file system abstraction layer.</p> |
| <div class="section" id="specify-fs-fs-as-a-dependency-of-your-file-system-package"> |
| <h2>1. Specify <code class="docutils literal notranslate"><span class="pre">fs/fs</span></code> as a dependency of your file system package.<a class="headerlink" href="#specify-fs-fs-as-a-dependency-of-your-file-system-package" title="Permalink to this headline">¶</a></h2> |
| <p>The file system package must register itself with the <code class="docutils literal notranslate"><span class="pre">fs/fs</span></code> package, |
| so it must specify <code class="docutils literal notranslate"><span class="pre">fs/fs</span></code> as a dependency. As an example, part of the |
| Newtron Flash File System (nffs) <code class="docutils literal notranslate"><span class="pre">pkg.yml</span></code> is reproduced below. Notice |
| the first item in the <code class="docutils literal notranslate"><span class="pre">pkg.deps</span></code> list.</p> |
| <div class="highlight-console notranslate"><div class="highlight"><pre><span></span><span class="go">pkg.name: fs/nffs</span> |
| <span class="go">pkg.deps:</span> |
| <span class="go"> - "@apache-mynewt-core/fs/fs"</span> |
| <span class="go"> - "@apache-mynewt-core/hw/hal"</span> |
| <span class="go"> - "@apache-mynewt-core/libs/os"</span> |
| <span class="go"> - "@apache-mynewt-core/libs/testutil"</span> |
| <span class="go"> - "@apache-mynewt-core/sys/log"</span> |
| </pre></div> |
| </div> |
| </div> |
| <div class="section" id="register-your-package-s-api-with-the-fs-fs-interface"> |
| <h2>2. Register your package’s API with the <code class="docutils literal notranslate"><span class="pre">fs/fs</span></code> interface.<a class="headerlink" href="#register-your-package-s-api-with-the-fs-fs-interface" title="Permalink to this headline">¶</a></h2> |
| <p>The <code class="docutils literal notranslate"><span class="pre">fs/fs</span></code> package calls into the underlying file system via a |
| collection of function pointers. To plug your file system into the |
| <code class="docutils literal notranslate"><span class="pre">fs/fs</span></code> API, you must assign these function pointers to the |
| corresponding routines in your file system package.</p> |
| <p>For example, <code class="docutils literal notranslate"><span class="pre">nffs</span></code> registers itself with <code class="docutils literal notranslate"><span class="pre">fs/fs</span></code> as follows (from |
| <code class="docutils literal notranslate"><span class="pre">fs/nffs/src/nffs.c</span></code>):</p> |
| <div class="highlight-c notranslate"><div class="highlight"><pre><span></span><span class="k">static</span><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="k">struct</span><span class="w"> </span><span class="nc">fs_ops</span><span class="w"> </span><span class="n">nffs_ops</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="p">{</span> |
| <span class="w"> </span><span class="p">.</span><span class="n">f_open</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">nffs_open</span><span class="p">,</span> |
| <span class="w"> </span><span class="p">.</span><span class="n">f_close</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">nffs_close</span><span class="p">,</span> |
| <span class="w"> </span><span class="p">.</span><span class="n">f_read</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">nffs_read</span><span class="p">,</span> |
| <span class="w"> </span><span class="p">.</span><span class="n">f_write</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">nffs_write</span><span class="p">,</span> |
| |
| <span class="w"> </span><span class="p">.</span><span class="n">f_seek</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">nffs_seek</span><span class="p">,</span> |
| <span class="w"> </span><span class="p">.</span><span class="n">f_getpos</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">nffs_getpos</span><span class="p">,</span> |
| <span class="w"> </span><span class="p">.</span><span class="n">f_filelen</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">nffs_file_len</span><span class="p">,</span> |
| |
| <span class="w"> </span><span class="p">.</span><span class="n">f_unlink</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">nffs_unlink</span><span class="p">,</span> |
| <span class="w"> </span><span class="p">.</span><span class="n">f_rename</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">nffs_rename</span><span class="p">,</span> |
| <span class="w"> </span><span class="p">.</span><span class="n">f_mkdir</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">nffs_mkdir</span><span class="p">,</span> |
| |
| <span class="w"> </span><span class="p">.</span><span class="n">f_opendir</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">nffs_opendir</span><span class="p">,</span> |
| <span class="w"> </span><span class="p">.</span><span class="n">f_readdir</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">nffs_readdir</span><span class="p">,</span> |
| <span class="w"> </span><span class="p">.</span><span class="n">f_closedir</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">nffs_closedir</span><span class="p">,</span> |
| |
| <span class="w"> </span><span class="p">.</span><span class="n">f_dirent_name</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">nffs_dirent_name</span><span class="p">,</span> |
| <span class="w"> </span><span class="p">.</span><span class="n">f_dirent_is_dir</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">nffs_dirent_is_dir</span><span class="p">,</span> |
| |
| <span class="w"> </span><span class="p">.</span><span class="n">f_name</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s">"nffs"</span> |
| <span class="p">};</span> |
| |
| <span class="kt">int</span> |
| <span class="nf">nffs_init</span><span class="p">(</span><span class="kt">void</span><span class="p">)</span> |
| <span class="p">{</span> |
| <span class="w"> </span><span class="cm">/* [...] */</span> |
| <span class="w"> </span><span class="n">fs_register</span><span class="p">(</span><span class="o">&</span><span class="n">nffs_ops</span><span class="p">);</span> |
| <span class="p">}</span> |
| </pre></div> |
| </div> |
| </div> |
| <div class="section" id="header-files"> |
| <h2>Header Files<a class="headerlink" href="#header-files" title="Permalink to this headline">¶</a></h2> |
| <p>To gain access to <code class="docutils literal notranslate"><span class="pre">fs/fs</span></code>’s registration interface, include the |
| following header:</p> |
| <div class="highlight-c notranslate"><div class="highlight"><pre><span></span><span class="cp">#include</span><span class="w"> </span><span class="cpf">"fs/fs_if.h"</span> |
| </pre></div> |
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