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| <h1 id="other-file-systems">Other File Systems</h1> |
| <p>Libraries use Mynewt's file system abstraction layer (<code>fs/fs</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> |
| <h3 id="1-specify-fsfs-as-a-dependency-of-your-file-system-package">1. Specify <code>fs/fs</code> as a dependency of your file system package.</h3> |
| <p>The file system package must register itself with the <code>fs/fs</code> package, so it must specify <code>fs/fs</code> as a dependency. As an example, part of the Newtron Flash File System (nffs) <code>pkg.yml</code> is reproduced below. Notice the first item in the <code>pkg.deps</code> list.</p> |
| <div class="codehilite" style="background: #ffffff"><pre style="line-height: 125%;"><span></span><code>pkg.name: fs/nffs |
| pkg.deps: |
| - fs/fs |
| - hw/hal |
| - libs/os |
| - libs/testutil |
| - sys/log |
| </code></pre></div> |
| |
| <h3 id="2-register-your-packages-api-with-the-fsfs-interface">2. Register your package's API with the <code>fs/fs</code> interface.</h3> |
| <p>The <code>fs/fs</code> package calls into the underlying file system via a collection of function pointers. To plug your file system into the <code>fs/fs</code> API, you must assign these function pointers to the corresponding routines in your file system package.</p> |
| <p>For example, <code>nffs</code> registers itself with <code>fs/fs</code> as follows (from <code>fs/nffs/src/nffs.c</code>):</p> |
| <div class="codehilite" style="background: #ffffff"><pre style="line-height: 125%;"><span></span><code><span style="color: #A90D91">static</span> <span style="color: #A90D91">const</span> <span style="color: #A90D91">struct</span> <span style="color: #3F6E75">fs_ops</span> <span style="color: #000000">nffs_ops</span> <span style="color: #000000">=</span> { |
| .<span style="color: #000000">f_open</span> <span style="color: #000000">=</span> <span style="color: #000000">nffs_open</span>, |
| .<span style="color: #000000">f_close</span> <span style="color: #000000">=</span> <span style="color: #000000">nffs_close</span>, |
| .<span style="color: #000000">f_read</span> <span style="color: #000000">=</span> <span style="color: #000000">nffs_read</span>, |
| .<span style="color: #000000">f_write</span> <span style="color: #000000">=</span> <span style="color: #000000">nffs_write</span>, |
| |
| .<span style="color: #000000">f_seek</span> <span style="color: #000000">=</span> <span style="color: #000000">nffs_seek</span>, |
| .<span style="color: #000000">f_getpos</span> <span style="color: #000000">=</span> <span style="color: #000000">nffs_getpos</span>, |
| .<span style="color: #000000">f_filelen</span> <span style="color: #000000">=</span> <span style="color: #000000">nffs_file_len</span>, |
| |
| .<span style="color: #000000">f_unlink</span> <span style="color: #000000">=</span> <span style="color: #000000">nffs_unlink</span>, |
| .<span style="color: #000000">f_rename</span> <span style="color: #000000">=</span> <span style="color: #000000">nffs_rename</span>, |
| .<span style="color: #000000">f_mkdir</span> <span style="color: #000000">=</span> <span style="color: #000000">nffs_mkdir</span>, |
| |
| .<span style="color: #000000">f_opendir</span> <span style="color: #000000">=</span> <span style="color: #000000">nffs_opendir</span>, |
| .<span style="color: #000000">f_readdir</span> <span style="color: #000000">=</span> <span style="color: #000000">nffs_readdir</span>, |
| .<span style="color: #000000">f_closedir</span> <span style="color: #000000">=</span> <span style="color: #000000">nffs_closedir</span>, |
| |
| .<span style="color: #000000">f_dirent_name</span> <span style="color: #000000">=</span> <span style="color: #000000">nffs_dirent_name</span>, |
| .<span style="color: #000000">f_dirent_is_dir</span> <span style="color: #000000">=</span> <span style="color: #000000">nffs_dirent_is_dir</span>, |
| |
| .<span style="color: #000000">f_name</span> <span style="color: #000000">=</span> <span style="color: #C41A16">"nffs"</span> |
| }; |
| |
| <span style="color: #A90D91">int</span> |
| <span style="color: #000000">nffs_init</span>(<span style="color: #A90D91">void</span>) |
| { |
| <span style="color: #177500">/* [...] */</span> |
| <span style="color: #000000">fs_register</span>(<span style="color: #000000">&nffs_ops</span>); |
| } |
| </code></pre></div> |
| |
| <h3 id="header-files">Header Files</h3> |
| <p>To gain access to <code>fs/fs</code>'s registration interface, include the following header:</p> |
| <div class="codehilite" style="background: #ffffff"><pre style="line-height: 125%;"><span></span><code><span style="color: #633820">#include</span> <span style="color: #177500">"fs/fs_if.h"</span> |
| </code></pre></div> |
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