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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>generic_permission</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="re73.html" title="mpage_writepages" /><link rel="next" href="re75.html" title="inode_permission" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center"><span>generic_permission</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="re73.html">Prev</a> </td><th width="60%" align="center">Other Functions</th><td width="20%" align="right"> <a accesskey="n" href="re75.html">Next</a></td></tr></table><hr /></div><div class="refentry" title="generic_permission"><a id="API-generic-permission"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>generic_permission —
check for access rights on a Posix-like filesystem
</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">int <b class="fsfunc">generic_permission </b>(</code></td><td>struct inode * <var class="pdparam">inode</var>, </td></tr><tr><td> </td><td>int <var class="pdparam">mask</var>, </td></tr><tr><td> </td><td>int (*<var class="pdparam">check_acl</var>)
<code>(</code>struct inode *inode, int mask<code>)</code><code>)</code>;</td></tr></table><div class="funcprototype-spacer"> </div></div></div><div class="refsect1" title="Arguments"><a id="id3107505"></a><h2>Arguments</h2><div class="variablelist"><dl><dt><span class="term"><em class="parameter"><code>inode</code></em></span></dt><dd><p>
inode to check access rights for
</p></dd><dt><span class="term"><em class="parameter"><code>mask</code></em></span></dt><dd><p>
right to check for (<code class="constant">MAY_READ</code>, <code class="constant">MAY_WRITE</code>, <code class="constant">MAY_EXEC</code>)
</p></dd><dt><span class="term"><em class="parameter"><code>check_acl</code></em></span></dt><dd><p>
optional callback to check for Posix ACLs
</p></dd></dl></div></div><div class="refsect1" title="Description"><a id="id3107574"></a><h2>Description</h2><p>
Used to check for read/write/execute permissions on a file.
We use <span class="quote">“<span class="quote">fsuid</span>”</span> for this, letting us set arbitrary permissions
for filesystem access without changing the <span class="quote">“<span class="quote">normal</span>”</span> uids which
are used for other things..
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