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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_add_request_payload</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="re507.html" title="part_round_stats" /><link rel="next" href="re509.html" title="submit_bio" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center"><span>blk_add_request_payload</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="re507.html">Prev</a> </td><th width="60%" align="center">Chapter 14. Block Devices</th><td width="20%" align="right"> <a accesskey="n" href="re509.html">Next</a></td></tr></table><hr /></div><div class="refentry" title="blk_add_request_payload"><a id="API-blk-add-request-payload"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>blk_add_request_payload —
add a payload to a request
</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">void <b class="fsfunc">blk_add_request_payload </b>(</code></td><td>struct request * <var class="pdparam">rq</var>, </td></tr><tr><td> </td><td>struct page * <var class="pdparam">page</var>, </td></tr><tr><td> </td><td>unsigned int <var class="pdparam">len</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer"> </div></div></div><div class="refsect1" title="Arguments"><a id="id2696310"></a><h2>Arguments</h2><div class="variablelist"><dl><dt><span class="term"><em class="parameter"><code>rq</code></em></span></dt><dd><p>
request to update
</p></dd><dt><span class="term"><em class="parameter"><code>page</code></em></span></dt><dd><p>
page backing the payload
</p></dd><dt><span class="term"><em class="parameter"><code>len</code></em></span></dt><dd><p>
length of the payload.
</p></dd></dl></div></div><div class="refsect1" title="Description"><a id="id2696371"></a><h2>Description</h2><p>
This allows to later add a payload to an already submitted request by
a block driver. The driver needs to take care of freeing the payload
itself.
</p><p>
Note that this is a quite horrible hack and nothing but handling of
discard requests should ever use it.
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