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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>iget5_locked</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="re37.html" title="ilookup" /><link rel="next" href="re39.html" title="iget_locked" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center"><span>iget5_locked</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="re37.html">Prev</a> </td><th width="60%" align="center">Inode Handling</th><td width="20%" align="right"> <a accesskey="n" href="re39.html">Next</a></td></tr></table><hr /></div><div class="refentry" title="iget5_locked"><a id="API-iget5-locked"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>iget5_locked —
obtain an inode from a mounted file system
</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">iget5_locked </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>int (*<var class="pdparam">set</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="id3007533"></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
</p></dd><dt><span class="term"><em class="parameter"><code>hashval</code></em></span></dt><dd><p>
hash value (usually inode number) to get
</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>set</code></em></span></dt><dd><p>
callback used to initialize a new struct inode
</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> and <em class="parameter"><code>set</code></em>
</p></dd></dl></div></div><div class="refsect1" title="Description"><a id="id3007637"></a><h2>Description</h2><p>
<code class="function">iget5_locked</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 and if present it is returned with an increased
reference count. This is a generalized version of <code class="function">iget_locked</code> for file
systems where the inode number is not sufficient for unique identification
of an inode.
</p><p>
If the inode is not in cache, <code class="function">get_new_inode</code> is called to allocate a new
inode and this is returned locked, hashed, and with the I_NEW flag set. The
file system gets to fill it in before unlocking it via <code class="function">unlock_new_inode</code>.
</p><p>
Note both <em class="parameter"><code>test</code></em> and <em class="parameter"><code>set</code></em> are called with the inode_lock held, so can't sleep.
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