1<html><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968"><title>blk_fetch_request</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="blkdev.html" title="Chapter&#160;14.&#160;Block Devices"><link rel="prev" href="API-blk-start-request.html" title="blk_start_request"><link rel="next" href="API-blk-update-request.html" title="blk_update_request"></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">blk_fetch_request</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="API-blk-start-request.html">Prev</a>&#160;</td><th width="60%" align="center">Chapter&#160;14.&#160;Block Devices</th><td width="20%" align="right">&#160;<a accesskey="n" href="API-blk-update-request.html">Next</a></td></tr></table><hr></div><div class="refentry"><a name="API-blk-fetch-request"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>blk_fetch_request &#8212; 
2     fetch a request from a request queue
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 request * <b class="fsfunc">blk_fetch_request </b>(</code></td><td>struct request_queue * <var class="pdparam">q</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer">&#160;</div></div></div><div class="refsect1"><a name="idp1127988636"></a><h2>Arguments</h2><div class="variablelist"><dl class="variablelist"><dt><span class="term"><em class="parameter"><code>q</code></em></span></dt><dd><p>
4     request queue to fetch a request from
5    </p></dd></dl></div></div><div class="refsect1"><a name="idp1127990252"></a><h2>Description</h2><p>
6   Return the request at the top of <em class="parameter"><code>q</code></em>.  The request is started on
7   return and LLD can start processing it immediately.
8</p></div><div class="refsect1"><a name="idp1127991316"></a><h2>Return</h2><p>
9   Pointer to the request at the top of <em class="parameter"><code>q</code></em> if available.  Null
10   otherwise.
11</p></div><div class="refsect1"><a name="idp1127992324"></a><h2>Context</h2><p>
12   queue_lock must be held.
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