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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>ilookup5</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="ch01s03.html" title="Inode Handling" /><link rel="prev" href="re35.html" title="ilookup5_nowait" /><link rel="next" href="re37.html" title="ilookup" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center"><span>ilookup5</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="re35.html">Prev</a> </td><th width="60%" align="center">Inode Handling</th><td width="20%" align="right"> <a accesskey="n" href="re37.html">Next</a></td></tr></table><hr /></div><div class="refentry" title="ilookup5"><a id="API-ilookup5"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>ilookup5 —
search for an inode in the inode cache
</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">struct inode * <b class="fsfunc">ilookup5 </b>(</code></td><td>struct super_block * <var class="pdparam">sb</var>, </td></tr><tr><td> </td><td>unsigned long <var class="pdparam">hashval</var>, </td></tr><tr><td> </td><td>int (*<var class="pdparam">test</var>)
<code>(</code>struct inode *, void *<code>)</code>, </td></tr><tr><td> </td><td>void * <var class="pdparam">data</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer"> </div></div></div><div class="refsect1" title="Arguments"><a id="id3101581"></a><h2>Arguments</h2><div class="variablelist"><dl><dt><span class="term"><em class="parameter"><code>sb</code></em></span></dt><dd><p>
super block of file system to search
</p></dd><dt><span class="term"><em class="parameter"><code>hashval</code></em></span></dt><dd><p>
hash value (usually inode number) to search for
</p></dd><dt><span class="term"><em class="parameter"><code>test</code></em></span></dt><dd><p>
callback used for comparisons between inodes
</p></dd><dt><span class="term"><em class="parameter"><code>data</code></em></span></dt><dd><p>
opaque data pointer to pass to <em class="parameter"><code>test</code></em>
</p></dd></dl></div></div><div class="refsect1" title="Description"><a id="id3101663"></a><h2>Description</h2><p>
<code class="function">ilookup5</code> uses <code class="function">ifind</code> to search for the inode specified by <em class="parameter"><code>hashval</code></em> and
<em class="parameter"><code>data</code></em> in the inode cache. This is a generalized version of <code class="function">ilookup</code> for
file systems where the inode number is not sufficient for unique
identification of an inode.
</p><p>
If the inode is in the cache, the inode lock is waited upon and the inode is
returned with an incremented reference count.
</p><p>
Otherwise NULL is returned.
</p><p>
Note, <em class="parameter"><code>test</code></em> is called with the inode_lock held, so can't sleep.
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