1<html><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968"><title>blk_rq_err_bytes</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-insert-cloned-request.html" title="blk_insert_cloned_request"><link rel="next" href="API-blk-peek-request.html" title="blk_peek_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_rq_err_bytes</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="API-blk-insert-cloned-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-peek-request.html">Next</a></td></tr></table><hr></div><div class="refentry"><a name="API-blk-rq-err-bytes"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>blk_rq_err_bytes &#8212; 
2     determine number of bytes till the next failure boundary
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">unsigned int <b class="fsfunc">blk_rq_err_bytes </b>(</code></td><td>const struct request * <var class="pdparam">rq</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer">&#160;</div></div></div><div class="refsect1"><a name="idp1127962276"></a><h2>Arguments</h2><div class="variablelist"><dl class="variablelist"><dt><span class="term"><em class="parameter"><code>rq</code></em></span></dt><dd><p>
4     request to examine
5    </p></dd></dl></div></div><div class="refsect1"><a name="idp1127963876"></a><h2>Description</h2><p>
6   A request could be merge of IOs which require different failure
7   handling.  This function determines the number of bytes which
8   can be failed from the beginning of the request without
9   crossing into area which need to be retried further.
10</p></div><div class="refsect1"><a name="idp1127964724"></a><h2>Return</h2><p>
11   The number of bytes to fail.
12</p></div><div class="refsect1"><a name="idp1127965356"></a><h2>Context</h2><p>
13   queue_lock must be held.
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