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| <h1 id="file-system-abstraction">File System Abstraction</h1> |
| <p>Mynewt provides a file system abstraction layer (<code>fs/fs</code>) to allow client code to be file system agnostic. By accessing the file system via the <code>fs/fs</code> API, client code can perform file system operations without being tied to a particular implementation. When possible, library code should use the <code>fs/fs</code> API rather than accessing the underlying file system directly.</p> |
| <h3 id="description">Description</h3> |
| <p>Applications should aim to minimize the amount of code which depends on a particular file system implementation. When possible, only depend on the |
| <code>fs/fs</code> package. |
| In terms of the Mynewt hierarchy, an <strong>app</strong> package must depend on a specific file system package, while <strong>library</strong> packages should only depend on <code>fs/fs</code>.</p> |
| <p>Applications wanting to access a filesystem are required to include the necessary packages in their applications pkg.yml file. |
| In the following example, the <a href="../../nffs/nffs/"><code>Newtron Flash File System</code></a> |
| is used.</p> |
| <div class="codehilite" style="background: #ffffff"><pre style="line-height: 125%;"><span></span><code># repos/apache-mynewt-core/apps/slinky/pkg.yml |
| |
| pkg.name: repos/apache-mynewt-core/apps/slinky |
| pkg.deps: |
| - fs/fs # include the file operations interfaces |
| - fs/nffs # include the NFFS filesystem implementation |
| </code></pre></div> |
| |
| <div class="codehilite" style="background: #ffffff"><pre style="line-height: 125%;"><span></span><code># repos/apache-mynewt-core/apps/slinky/syscfg.yml |
| # [...] |
| # Package: apps/<example app> |
| # [...] |
| CONFIG_NFFS: 1 # initialize and configure NFFS into the system |
| # NFFS_DETECT_FAIL: 1 # Ignore NFFS detection issues |
| # NFFS_DETECT_FAIL: 2 # Format a new NFFS file system on failure to detect |
| |
| # [...] |
| </code></pre></div> |
| |
| <p>Consult the documentation for <a href="../../nffs/nffs/"><code>nffs</code></a> for a more detailed explanation of NFFS_DETECT_FAIL</p> |
| <p>Code which uses the file system after the system has been initialized need only depend on <code>fs/fs</code>. For example, the <code>libs/imgmgr</code> package is a library which provides firmware upload and download functionality via the use of a file system. This library is only used after the system has been initialized, and therefore only depends on the <code>fs/fs</code> package.</p> |
| <div class="codehilite" style="background: #ffffff"><pre style="line-height: 125%;"><span></span><code># repos/apache-mynewt-core/libs/imgmgr/pkg.yml |
| pkg.name: libs/imgmgr |
| pkg.deps: |
| - fs/fs |
| |
| # [...] |
| </code></pre></div> |
| |
| <p>The <code>libs/imgmgr</code> package uses the <code>fs/fs</code> API for all file system operations.</p> |
| <h3 id="support-for-multiple-filesystems">Support for multiple filesystems</h3> |
| <p>When using a single filesystem/disk, it is valid to provide paths in the standard |
| unix way, eg, <code>/<dir-name>/<file-name></code>. When trying to run more than one filesystem |
| or a single filesystem in multiple devices simultaneosly, an extra name has to be |
| given to the disk that is being used. The abstraction for that was added as the |
| <code>fs/disk</code> package which is a dependency of <code>fs/fs</code>. It adds the following extra |
| user function:</p> |
| <div class="codehilite" style="background: #ffffff"><pre style="line-height: 125%;"><span></span><code><span style="color: #A90D91">int</span> <span style="color: #000000">disk_register</span>(<span style="color: #A90D91">const</span> <span style="color: #A90D91">char</span> <span style="color: #000000">*disk_name</span>, <span style="color: #A90D91">const</span> <span style="color: #A90D91">char</span> <span style="color: #000000">*fs_name</span>, <span style="color: #A90D91">struct</span> <span style="color: #3F6E75">disk_ops</span> <span style="color: #000000">*dops</span>) |
| </code></pre></div> |
| |
| <p>As an example os usage:</p> |
| <div class="codehilite" style="background: #ffffff"><pre style="line-height: 125%;"><span></span><code><span style="color: #000000">disk_register</span>(<span style="color: #C41A16">"mmc0"</span>, <span style="color: #C41A16">"fatfs"</span>, <span style="color: #000000">&mmc_ops</span>); |
| <span style="color: #000000">disk_register</span>(<span style="color: #C41A16">"flash0"</span>, <span style="color: #C41A16">"nffs"</span>, <span style="color: #A90D91">NULL</span>); |
| </code></pre></div> |
| |
| <p>This registers the name <code>mmc0</code> to use <code>fatfs</code> as the filesystem and <code>mmc_ops</code> for |
| the low-level disk driver and also registers <code>flash0</code> to use <code>nffs</code>. <code>nffs</code> is |
| currently strongly bound to the <code>hal_flash</code> interface, ignoring any other possible |
| <code>disk_ops</code> given.</p> |
| <h4 id="struct-disk_ops">struct disk_ops</h4> |
| <p>To support a new low-level disk interface, the <code>struct disk_ops</code> interface must |
| be implemented by the low-level driver. Currently only <code>read</code> and <code>write</code> are |
| effectively used (by <code>fatfs</code>).</p> |
| <div class="codehilite" style="background: #ffffff"><pre style="line-height: 125%;"><span></span><code><span style="color: #A90D91">struct</span> <span style="color: #3F6E75">disk_ops</span> { |
| <span style="color: #A90D91">int</span> (<span style="color: #000000">*read</span>)(<span style="color: #A90D91">uint8_t</span>, <span style="color: #A90D91">uint32_t</span>, <span style="color: #A90D91">void</span> <span style="color: #000000">*</span>, <span style="color: #A90D91">uint32_t</span>); |
| <span style="color: #A90D91">int</span> (<span style="color: #000000">*write</span>)(<span style="color: #A90D91">uint8_t</span>, <span style="color: #A90D91">uint32_t</span>, <span style="color: #A90D91">const</span> <span style="color: #A90D91">void</span> <span style="color: #000000">*</span>, <span style="color: #A90D91">uint32_t</span>); |
| <span style="color: #A90D91">int</span> (<span style="color: #000000">*ioctl</span>)(<span style="color: #A90D91">uint8_t</span>, <span style="color: #A90D91">uint32_t</span>, <span style="color: #A90D91">void</span> <span style="color: #000000">*</span>); |
| <span style="color: #000000">SLIST_ENTRY</span>(<span style="color: #000000">disk_ops</span>) <span style="color: #000000">sc_next</span>; |
| } |
| </code></pre></div> |
| |
| <h3 id="thread-safety">Thread Safety</h3> |
| <p>All <code>fs/fs</code> functions are thread safe.</p> |
| <h3 id="header-files">Header Files</h3> |
| <p>All code which uses the <code>fs/fs</code> package needs to 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.h"</span> |
| </code></pre></div> |
| |
| <h3 id="data-structures">Data Structures</h3> |
| <p>All <code>fs/fs</code> data structures are opaque to client code.</p> |
| <div class="codehilite" style="background: #ffffff"><pre style="line-height: 125%;"><span></span><code><span style="color: #A90D91">struct</span> <span style="color: #3F6E75">fs_file</span>; |
| <span style="color: #A90D91">struct</span> <span style="color: #3F6E75">fs_dir</span>; |
| <span style="color: #A90D91">struct</span> <span style="color: #3F6E75">fs_dirent</span>; |
| </code></pre></div> |
| |
| <h3 id="api"><a name="API"></a>API</h3> |
| <p>Functions in <code>fs/fs</code> that indicate success or failure do so with the following set of return codes:</p> |
| <ul> |
| <li><a href="../fs_return_codes/">Return Codes</a></li> |
| </ul> |
| <p>The functions available in this OS feature are:</p> |
| <table> |
| <thead> |
| <tr> |
| <th>Function</th> |
| <th>Description</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td><a href="../fs_close/">fs_close</a></td> |
| <td>Closes the specified file and invalidates the file handle.</td> |
| </tr> |
| <tr> |
| <td><a href="../fs_closedir/">fs_closedir</a></td> |
| <td>Closes the specified directory handle.</td> |
| </tr> |
| <tr> |
| <td><a href="../fs_dirent_is_dir/">fs_dirent_is_dir</a></td> |
| <td>Tells you whether the specified directory entry is a sub-directory or a regular file.</td> |
| </tr> |
| <tr> |
| <td><a href="../fs_dirent_name/">fs_dirent_name</a></td> |
| <td>Retrieves the filename of the specified directory entry.</td> |
| </tr> |
| <tr> |
| <td><a href="../fs_filelen/">fs_filelen</a></td> |
| <td>Retrieves the current length of the specified open file.</td> |
| </tr> |
| <tr> |
| <td><a href="../fs_getpos/">fs_getpos</a></td> |
| <td>Retrieves the current read and write position of the specified open file.</td> |
| </tr> |
| <tr> |
| <td><a href="../fs_mkdir/">fs_mkdir</a></td> |
| <td>Creates the directory represented by the specified path.</td> |
| </tr> |
| <tr> |
| <td><a href="../fs_open/">fs_open</a></td> |
| <td>Opens a file at the specified path.</td> |
| </tr> |
| <tr> |
| <td><a href="../fs_opendir/">fs_opendir</a></td> |
| <td>Opens the directory at the specified path.</td> |
| </tr> |
| <tr> |
| <td><a href="../fs_read/">fs_read</a></td> |
| <td>Reads data from the specified file.</td> |
| </tr> |
| <tr> |
| <td><a href="../fs_readdir/">fs_readdir</a></td> |
| <td>Reads the next entry in an open directory.</td> |
| </tr> |
| <tr> |
| <td><a href="../fs_register/">fs_register</a></td> |
| <td>Registers a file system with the abstraction layer.</td> |
| </tr> |
| <tr> |
| <td><a href="../fs_rename/">fs_rename</a></td> |
| <td>Performs a rename and/or move of the specified source path to the specified destination.</td> |
| </tr> |
| <tr> |
| <td><a href="../fs_seek/">fs_seek</a></td> |
| <td>Positions a file's read and write pointer at the specified offset.</td> |
| </tr> |
| <tr> |
| <td><a href="../fs_unlink/">fs_unlink</a></td> |
| <td>Unlinks the file or directory at the specified path.</td> |
| </tr> |
| <tr> |
| <td><a href="../fs_write/">fs_write</a></td> |
| <td>Writes the supplied data to the current offset of the specified file handle.</td> |
| </tr> |
| </tbody> |
| </table> |
| <p>Additional file system utilities that bundle some of the basic functions above are:</p> |
| <table> |
| <thead> |
| <tr> |
| <th>Function</th> |
| <th>Description</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td><a href="../fsutil_read_file/">fsutil_read_file</a></td> |
| <td>Opens a file at the specified path, retrieve data from the file starting from the specified offset, and close the file and invalidate the file handle.</td> |
| </tr> |
| <tr> |
| <td><a href="../fsutil_write_file/">fsutil_write_file</a></td> |
| <td>Open a file at the specified path, write the supplied data to the current offset of the specified file handle, and close the file and invalidate the file handle.</td> |
| </tr> |
| </tbody> |
| </table> |
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