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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>blk_peek_request</title><meta name="generator" content="DocBook XSL Stylesheets V1.75.2" /><link rel="home" href="index.html" title="The Linux Kernel API" /><link rel="up" href="ch14.html" title="Chapter 14. Block Devices" /><link rel="prev" href="re512.html" title="blk_rq_err_bytes" /><link rel="next" href="re514.html" title="blk_start_request" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center"><span>blk_peek_request</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="re512.html">Prev</a> </td><th width="60%" align="center">Chapter 14. Block Devices</th><td width="20%" align="right"> <a accesskey="n" href="re514.html">Next</a></td></tr></table><hr /></div><div class="refentry" title="blk_peek_request"><a id="API-blk-peek-request"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>blk_peek_request —
peek at the top of a request queue
</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 request * <b class="fsfunc">blk_peek_request </b>(</code></td><td>struct request_queue * <var class="pdparam">q</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer"> </div></div></div><div class="refsect1" title="Arguments"><a id="id2697097"></a><h2>Arguments</h2><div class="variablelist"><dl><dt><span class="term"><em class="parameter"><code>q</code></em></span></dt><dd><p>
request queue to peek at
</p></dd></dl></div></div><div class="refsect1" title="Description"><a id="id2697124"></a><h2>Description</h2><p>
Return the request at the top of <em class="parameter"><code>q</code></em>. The returned request
should be started using <code class="function">blk_start_request</code> before LLD starts
processing it.
</p></div><div class="refsect1" title="Return"><a id="id2697148"></a><h2>Return</h2><p>
Pointer to the request at the top of <em class="parameter"><code>q</code></em> if available. Null
otherwise.
</p></div><div class="refsect1" title="Context"><a id="id2697165"></a><h2>Context</h2><p>
queue_lock must be held.
</p></div></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="re512.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="ch14.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="re514.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top"><span>blk_rq_err_bytes</span> </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> <span>blk_start_request</span></td></tr></table></div></body></html>
