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authorJacob McDonnell <jacob@jacobmcdonnell.com>2026-04-25 19:59:05 -0400
committerJacob McDonnell <jacob@jacobmcdonnell.com>2026-04-25 19:59:05 -0400
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-<table class="head">
- <tr>
- <td class="head-ltitle">VREF(9)</td>
- <td class="head-vol">Kernel Developer's Manual</td>
- <td class="head-rtitle">VREF(9)</td>
- </tr>
-</table>
-<div class="manual-text">
-<section class="Sh">
-<h1 class="Sh" id="NAME"><a class="permalink" href="#NAME">NAME</a></h1>
-<p class="Pp"><code class="Nm">vref</code>, <code class="Nm">vrefl</code>
- &#x2014; <span class="Nd">increment the use count for a vnode</span></p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="SYNOPSIS"><a class="permalink" href="#SYNOPSIS">SYNOPSIS</a></h1>
-<p class="Pp"><code class="In">#include
- &lt;<a class="In">sys/param.h</a>&gt;</code>
- <br/>
- <code class="In">#include &lt;<a class="In">sys/vnode.h</a>&gt;</code></p>
-<p class="Pp"><var class="Ft">void</var>
- <br/>
- <code class="Fn">vref</code>(<var class="Fa" style="white-space: nowrap;">struct
- vnode *vp</var>);</p>
-<p class="Pp"><var class="Ft">void</var>
- <br/>
- <code class="Fn">vrefl</code>(<var class="Fa" style="white-space: nowrap;">struct
- vnode *vp</var>);</p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="DESCRIPTION"><a class="permalink" href="#DESCRIPTION">DESCRIPTION</a></h1>
-<p class="Pp">Increment the <var class="Va">v_usecount</var> field of a
- vnode.</p>
-<dl class="Bl-tag">
- <dt><var class="Fa">vp</var></dt>
- <dd>the vnode to increment</dd>
-</dl>
-<p class="Pp">Each vnode maintains a reference count of how many parts of the
- system are using the vnode. This allows the system to detect when a vnode is
- no longer being used and can be safely recycled for a different file.</p>
-<p class="Pp" id="vref">Any code in the system which is using a vnode (e.g.
- during the operation of some algorithm or to store in a data structure)
- should call
- <a class="permalink" href="#vref"><code class="Fn">vref</code></a>() or
- <a class="permalink" href="#vrefl"><code class="Fn" id="vrefl">vrefl</code></a>().</p>
-<p class="Pp" id="vref~2"><a class="permalink" href="#vref~2"><code class="Fn">vref</code></a>()
- locks the vnode interlock while
- <a class="permalink" href="#vrefl~2"><code class="Fn" id="vrefl~2">vrefl</code></a>()
- expects the interlock to already be held.</p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="SEE_ALSO"><a class="permalink" href="#SEE_ALSO">SEE
- ALSO</a></h1>
-<p class="Pp"><a class="Xr">vget(9)</a>, <a class="Xr">vnode(9)</a>,
- <a class="Xr">vput(9)</a>, <a class="Xr">vrefcnt(9)</a>,
- <a class="Xr">vrele(9)</a></p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="AUTHORS"><a class="permalink" href="#AUTHORS">AUTHORS</a></h1>
-<p class="Pp">This manual page was written by <span class="An">Doug
- Rabson</span>.</p>
-</section>
-</div>
-<table class="foot">
- <tr>
- <td class="foot-date">January 18, 2016</td>
- <td class="foot-os">FreeBSD 15.0</td>
- </tr>
-</table>