1<html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>inode_congested</title><meta name="generator" content="DocBook XSL Stylesheets V1.78.1"><link rel="home" href="index.html" title="Linux Filesystems API"><link rel="up" href="other_functions.html" title="Other Functions"><link rel="prev" href="API-wbc-account-io.html" title="wbc_account_io"><link rel="next" href="API---mark-inode-dirty.html" title="__mark_inode_dirty"></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">inode_congested</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="API-wbc-account-io.html">Prev</a> </td><th width="60%" align="center">Other Functions</th><td width="20%" align="right"> <a accesskey="n" href="API---mark-inode-dirty.html">Next</a></td></tr></table><hr></div><div class="refentry"><a name="API-inode-congested"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>inode_congested — 
2     test whether an inode is congested
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">int <b class="fsfunc">inode_congested </b>(</code></td><td>struct inode * <var class="pdparam">inode</var>, </td></tr><tr><td> </td><td>int <var class="pdparam">cong_bits</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer"> </div></div></div><div class="refsect1"><a name="id-1.3.7.66.5"></a><h2>Arguments</h2><div class="variablelist"><dl class="variablelist"><dt><span class="term"><em class="parameter"><code>inode</code></em></span></dt><dd><p>
4     inode to test for congestion (may be NULL)
5    </p></dd><dt><span class="term"><em class="parameter"><code>cong_bits</code></em></span></dt><dd><p>
6     mask of WB_[a]sync_congested bits to test
7    </p></dd></dl></div></div><div class="refsect1"><a name="id-1.3.7.66.6"></a><h2>Description</h2><p>
8   Tests whether <em class="parameter"><code>inode</code></em> is congested.  <em class="parameter"><code>cong_bits</code></em> is the mask of congestion
9   bits to test and the return value is the mask of set bits.
10   </p><p>
11
12   If cgroup writeback is enabled for <em class="parameter"><code>inode</code></em>, the congestion state is
13   determined by whether the cgwb (cgroup bdi_writeback) for the blkcg
14   associated with <em class="parameter"><code>inode</code></em> is congested; otherwise, the root wb's congestion
15   state is used.
16   </p><p>
17
18   <em class="parameter"><code>inode</code></em> is allowed to be NULL as this function is often called on
19   mapping-&gt;host which is NULL for the swapper space.
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