1<html><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968"><title>bd_link_disk_holder</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-bdgrab.html" title="bdgrab"><link rel="next" href="API-bd-unlink-disk-holder.html" title="bd_unlink_disk_holder"></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">bd_link_disk_holder</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="API-bdgrab.html">Prev</a>&#160;</td><th width="60%" align="center">Other Functions</th><td width="20%" align="right">&#160;<a accesskey="n" href="API-bd-unlink-disk-holder.html">Next</a></td></tr></table><hr></div><div class="refentry"><a name="API-bd-link-disk-holder"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>bd_link_disk_holder &#8212; 
2     create symlinks between holding disk and slave bdev
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">bd_link_disk_holder </b>(</code></td><td>struct block_device * <var class="pdparam">bdev</var>, </td></tr><tr><td>&#160;</td><td>struct gendisk * <var class="pdparam">disk</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer">&#160;</div></div></div><div class="refsect1"><a name="idp1102898324"></a><h2>Arguments</h2><div class="variablelist"><dl class="variablelist"><dt><span class="term"><em class="parameter"><code>bdev</code></em></span></dt><dd><p>
4     the claimed slave bdev
5    </p></dd><dt><span class="term"><em class="parameter"><code>disk</code></em></span></dt><dd><p>
6     the holding disk
7    </p></dd></dl></div></div><div class="refsect1"><a name="idp1102900956"></a><h2>Description</h2><p>
8   DON'T USE THIS UNLESS YOU'RE ALREADY USING IT.
9   </p><p>
10
11   This functions creates the following sysfs symlinks.
12   </p><p>
13
14   - from <span class="quote">&#8220;<span class="quote">slaves</span>&#8221;</span> directory of the holder <em class="parameter"><code>disk</code></em> to the claimed <em class="parameter"><code>bdev</code></em>
15   - from <span class="quote">&#8220;<span class="quote">holders</span>&#8221;</span> directory of the <em class="parameter"><code>bdev</code></em> to the holder <em class="parameter"><code>disk</code></em>
16   </p><p>
17
18   For example, if /dev/dm-0 maps to /dev/sda and disk for dm-0 is
19   passed to <code class="function">bd_link_disk_holder</code>, then:
20   </p><p>
21
22   /sys/block/dm-0/slaves/sda --&gt; /sys/block/sda
23   /sys/block/sda/holders/dm-0 --&gt; /sys/block/dm-0
24   </p><p>
25
26   The caller must have claimed <em class="parameter"><code>bdev</code></em> before calling this function and
27   ensure that both <em class="parameter"><code>bdev</code></em> and <em class="parameter"><code>disk</code></em> are valid during the creation and
28   lifetime of these symlinks.
29</p></div><div class="refsect1"><a name="idp1102906188"></a><h2>CONTEXT</h2><p>
30   Might sleep.
31</p></div><div class="refsect1"><a name="idp1102906804"></a><h2>RETURNS</h2><p>
32   0 on success, -errno on failure.
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