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<table class="head">
<tr>
<td class="head-ltitle">VFS_GETNEWFSID(9)</td>
<td class="head-vol">Kernel Developer's Manual</td>
<td class="head-rtitle">VFS_GETNEWFSID(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">vfs_getnewfsid</code> —
<span class="Nd">allocate a new file system identifier</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
<<a class="In">sys/param.h</a>></code>
<br/>
<code class="In">#include <<a class="In">sys/mount.h</a>></code></p>
<p class="Pp"><var class="Ft">void</var>
<br/>
<code class="Fn">vfs_getnewfsid</code>(<var class="Fa" style="white-space: nowrap;">struct
mount *mp</var>);</p>
</section>
<section class="Sh">
<h1 class="Sh" id="DESCRIPTION"><a class="permalink" href="#DESCRIPTION">DESCRIPTION</a></h1>
<p class="Pp">The
<a class="permalink" href="#vfs_getnewfsid"><code class="Fn" id="vfs_getnewfsid">vfs_getnewfsid</code></a>()
function allocates a new file system identifier for the mount point given.
File systems typically call <code class="Fn">vfs_getnewfsid</code>() in
their mount routine in order to acquire a unique ID within the system which
can later be used to uniquely identify the file system via calls such as
<a class="Xr">vfs_getvfs(9)</a>.</p>
<p class="Pp">The actual <var class="Vt">fsid</var> is made up of two 32 bit
integers, that are stored in the <var class="Vt">statfs</var> structure of
<var class="Fa">mp</var>. The first integer is unique in the set of mounted
file systems, while the second holds the file system type.</p>
<div class="Bd Pp Li">
<pre>typedef struct fsid {
int32_t val[2];
} fsid_t;</pre>
</div>
</section>
<section class="Sh">
<h1 class="Sh" id="PSEUDOCODE"><a class="permalink" href="#PSEUDOCODE">PSEUDOCODE</a></h1>
<div class="Bd Li">
<pre>xxx_mount(struct mount *mp, char *path, caddr_t data,
struct nameidata *ndp, struct thread *td)
{
...
vfs_getnewfsid(mp);
...
}</pre>
</div>
</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">vfs_getvfs(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">Chad David</span>
<<a class="Mt" href="mailto:davidc@acns.ab.ca">davidc@acns.ab.ca</a>>.</p>
</section>
</div>
<table class="foot">
<tr>
<td class="foot-date">November 21, 2001</td>
<td class="foot-os">FreeBSD 15.0</td>
</tr>
</table>
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