1<html><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968"><title>read_cache_page</title><meta name="generator" content="DocBook XSL Stylesheets V1.78.1"><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="API-filemap-fault.html" title="filemap_fault"><link rel="next" href="API-read-cache-page-gfp.html" title="read_cache_page_gfp"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center"><span class="phrase">read_cache_page</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="API-filemap-fault.html">Prev</a>&#160;</td><th width="60%" align="center">More Memory Management Functions</th><td width="20%" align="right">&#160;<a accesskey="n" href="API-read-cache-page-gfp.html">Next</a></td></tr></table><hr></div><div class="refentry"><a name="API-read-cache-page"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>read_cache_page &#8212; 
2     read into page cache, fill it if needed
3 </p></div><div class="refsynopsisdiv"><h2>Synopsis</h2><div class="funcsynopsis"><table border="0" class="funcprototype-table" summary="Function synopsis" style="cellspacing: 0; cellpadding: 0;"><tr><td><code class="funcdef">struct page * <b class="fsfunc">read_cache_page </b>(</code></td><td>struct address_space * <var class="pdparam">mapping</var>, </td></tr><tr><td>&#160;</td><td>pgoff_t <var class="pdparam">index</var>, </td></tr><tr><td>&#160;</td><td>int (*<var class="pdparam">filler</var>)
4     <code>(</code>void *, struct page *<code>)</code>, </td></tr><tr><td>&#160;</td><td>void * <var class="pdparam">data</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer">&#160;</div></div></div><div class="refsect1"><a name="idp1124214940"></a><h2>Arguments</h2><div class="variablelist"><dl class="variablelist"><dt><span class="term"><em class="parameter"><code>mapping</code></em></span></dt><dd><p>
5     the page's address_space
6    </p></dd><dt><span class="term"><em class="parameter"><code>index</code></em></span></dt><dd><p>
7     the page index
8    </p></dd><dt><span class="term"><em class="parameter"><code>filler</code></em></span></dt><dd><p>
9     function to perform the read
10    </p></dd><dt><span class="term"><em class="parameter"><code>data</code></em></span></dt><dd><p>
11     first arg to filler(data, page) function, often left as NULL
12    </p></dd></dl></div></div><div class="refsect1"><a name="idp1124219668"></a><h2>Description</h2><p>
13   Read into the page cache. If a page already exists, and <code class="function">PageUptodate</code> is
14   not set, try to fill the page and wait for it to become unlocked.
15   </p><p>
16
17   If the page does not get brought uptodate, return -EIO.
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