1<html><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968"><title>find_lock_entry</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-find-get-entry.html" title="find_get_entry"><link rel="next" href="API-pagecache-get-page.html" title="pagecache_get_page"></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">find_lock_entry</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="API-find-get-entry.html">Prev</a> </td><th width="60%" align="center">More Memory Management Functions</th><td width="20%" align="right"> <a accesskey="n" href="API-pagecache-get-page.html">Next</a></td></tr></table><hr></div><div class="refentry"><a name="API-find-lock-entry"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>find_lock_entry — 2 locate, pin and lock a page cache entry 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">find_lock_entry </b>(</code></td><td>struct address_space * <var class="pdparam">mapping</var>, </td></tr><tr><td> </td><td>pgoff_t <var class="pdparam">offset</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer"> </div></div></div><div class="refsect1"><a name="idp1124140580"></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> 4 the address_space to search 5 </p></dd><dt><span class="term"><em class="parameter"><code>offset</code></em></span></dt><dd><p> 6 the page cache index 7 </p></dd></dl></div></div><div class="refsect1"><a name="idp1124143228"></a><h2>Description</h2><p> 8 Looks up the page cache slot at <em class="parameter"><code>mapping</code></em> & <em class="parameter"><code>offset</code></em>. If there is a 9 page cache page, it is returned locked and with an increased 10 refcount. 11 </p><p> 12 13 If the slot holds a shadow entry of a previously evicted page, or a 14 swap entry from shmem/tmpfs, it is returned. 15 </p><p> 16 17 Otherwise, <code class="constant">NULL</code> is returned. 18 </p><p> 19 20 <code class="function">find_lock_entry</code> may sleep. 21</p></div></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="API-find-get-entry.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="API-pagecache-get-page.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top"><span class="phrase">find_get_entry</span> </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> <span class="phrase">pagecache_get_page</span></td></tr></table></div></body></html> 22