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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>block_invalidatepage</title><meta name="generator" content="DocBook XSL Stylesheets V1.75.2" /><link rel="home" href="index.html" title="Linux Filesystems API" /><link rel="up" href="ch01s06.html" title="Other Functions" /><link rel="prev" href="re85.html" title="__bread" /><link rel="next" href="re87.html" title="ll_rw_block" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center"><span>block_invalidatepage</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="re85.html">Prev</a> </td><th width="60%" align="center">Other Functions</th><td width="20%" align="right"> <a accesskey="n" href="re87.html">Next</a></td></tr></table><hr /></div><div class="refentry" title="block_invalidatepage"><a id="API-block-invalidatepage"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>block_invalidatepage —
invalidate part of all of a buffer-backed page
</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">void <b class="fsfunc">block_invalidatepage </b>(</code></td><td>struct page * <var class="pdparam">page</var>, </td></tr><tr><td> </td><td>unsigned long <var class="pdparam">offset</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer"> </div></div></div><div class="refsect1" title="Arguments"><a id="id3109273"></a><h2>Arguments</h2><div class="variablelist"><dl><dt><span class="term"><em class="parameter"><code>page</code></em></span></dt><dd><p>
the page which is affected
</p></dd><dt><span class="term"><em class="parameter"><code>offset</code></em></span></dt><dd><p>
the index of the truncation point
</p></dd></dl></div></div><div class="refsect1" title="Description"><a id="id3109316"></a><h2>Description</h2><p>
<code class="function">block_invalidatepage</code> is called when all or part of the page has become
invalidatedby a truncate operation.
</p><p>
<code class="function">block_invalidatepage</code> does not have to release all buffers, but it must
ensure that no dirty buffer is left outside <em class="parameter"><code>offset</code></em> and that no I/O
is underway against any of the blocks which are outside the truncation
point. Because the caller is about to free (and possibly reuse) those
blocks on-disk.
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