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FatFs: Update to release R0.12b.

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Jared Boone
2017-05-03 12:35:19 +01:00
parent dd0048db8d
commit 85712a2c5f
57 changed files with 532 additions and 331 deletions
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firmware/chibios-portapack/ext/fatfs/doc/en/expand.html
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@@ -59,9 +59,9 @@ FRESULT f_expand (
<li>The file has been opened in read-only mode.</li>
<li>Not allowable file size. (&gt;= 4GiB on FAT volume)</li>
</ul>
<p>When <tt class="arg">opt</tt> is 0, the function finds a contiguous data area and set it as suggested point for next allocation instead of allocating it to the file. The next cluster allocation is started at top of the contiguous area found by this function. Thus the write file is guaranteed be contiguous and no allocation delay until the size reaches that size at least unless any other operation to the volume with changes of FAT is performed.</p>
<p>The contiguous file would have an advantage at time-critical read/write operations. It reduces some overheads in the file system and the storage media caused by random access due to fragmented file data. Especially, at the exFAT volume, any FAT access for the contiguous file is completely eliminated and storage media will be accessed sequentially.</p>
<p>Also the contiguous file data can be easily accessed directly via low-level disk functions but it is not recommended in consideration for future compatibility.</p>
<p>When <tt class="arg">opt</tt> is 0, the function finds a contiguous data area and set it as suggested point for next allocation instead of allocating it to the file. The next cluster allocation is started at top of the contiguous area found by this function. Thus the write file is guaranteed be contiguous and no allocation delay until the size reaches that size at least unless any other changes to the volume is performed.</p>
<p>The contiguous file would have an advantage at time-critical read/write operations. It reduces some overheads in the file system and the storage media caused by random access due to fragmented file data. Especially FAT access for the contiguous file on the exFAT volume is completely eliminated and storage media will be accessed sequentially.</p>
<p>Also the contiguous file data can be easily accessed directly via low-level disk functions. But this is not recommended in consideration for future compatibility.</p>
</div>
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