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<html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968" /><title>vmtruncate</title><meta name="generator" content="DocBook XSL Stylesheets V1.75.2" /><link rel="home" href="index.html" title="The Linux Kernel API" /><link rel="up" href="ch04s03.html" title="More Memory Management Functions" /><link rel="prev" href="re232.html" title="truncate_pagecache" /><link rel="next" href="ch05.html" title="Chapter 5. Kernel IPC facilities" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center"><span>vmtruncate</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="re232.html">Prev</a> </td><th width="60%" align="center">More Memory Management Functions</th><td width="20%" align="right"> <a accesskey="n" href="ch05.html">Next</a></td></tr></table><hr /></div><div class="refentry" title="vmtruncate"><a id="API-vmtruncate"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>vmtruncate —
unmap mappings <span class="quote">“<span class="quote">freed</span>”</span> by <code class="function">truncate</code> syscall
</p></div><div class="refsynopsisdiv" title="Synopsis"><h2>Synopsis</h2><div class="funcsynopsis"><table border="0" summary="Function synopsis" cellspacing="0" cellpadding="0" class="funcprototype-table"><tr><td><code class="funcdef">int <b class="fsfunc">vmtruncate </b>(</code></td><td>struct inode * <var class="pdparam">inode</var>, </td></tr><tr><td> </td><td>loff_t <var class="pdparam">offset</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer"> </div></div></div><div class="refsect1" title="Arguments"><a id="id2654312"></a><h2>Arguments</h2><div class="variablelist"><dl><dt><span class="term"><em class="parameter"><code>inode</code></em></span></dt><dd><p>
inode of the file used
</p></dd><dt><span class="term"><em class="parameter"><code>offset</code></em></span></dt><dd><p>
file offset to start truncating
</p></dd></dl></div></div><div class="refsect1" title="Description"><a id="id2654356"></a><h2>Description</h2><p>
NOTE! We have to be ready to update the memory sharing
between the file and the memory map for a potential last
incomplete page. Ugly, but necessary.
</p></div></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="re232.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="ch04s03.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="ch05.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top"><span>truncate_pagecache</span> </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> Chapter 5. Kernel IPC facilities</td></tr></table></div></body></html>
