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-<table class="head">
- <tr>
- <td class="head-ltitle">FUSEFS(4)</td>
- <td class="head-vol">Device Drivers Manual</td>
- <td class="head-rtitle">FUSEFS(4)</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">fusefs</code> &#x2014; <span class="Nd">File
- system in USErspace</span></p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="SYNOPSIS"><a class="permalink" href="#SYNOPSIS">SYNOPSIS</a></h1>
-<p class="Pp">To link into the kernel:</p>
-<div class="Bd Pp Bd-indent"><code class="Cd">options FUSEFS</code></div>
-<p class="Pp">To load as a loadable kernel module:</p>
-<p class="Pp"></p>
-<div class="Bd Bd-indent"><code class="Li">kldload fusefs</code></div>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="DESCRIPTION"><a class="permalink" href="#DESCRIPTION">DESCRIPTION</a></h1>
-<p class="Pp">The <code class="Nm">fusefs</code> driver implements a file system
- that is serviced by a userspace program.</p>
-<p class="Pp">There are many uses for <code class="Nm">fusefs</code>. Userspace
- daemons can access libraries or programming languages that cannot run in
- kernel-mode, for example. <code class="Nm">fusefs</code> is also useful for
- developing and debugging file systems, because a crash of the daemon will
- not take down the entire operating system. Finally, the
- <code class="Nm">fusefs</code> API is portable. Many daemons can run on
- multiple operating systems with minimal modifications.</p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="SYSCTL_VARIABLES"><a class="permalink" href="#SYSCTL_VARIABLES">SYSCTL
- VARIABLES</a></h1>
-<p class="Pp">The following <a class="Xr">sysctl(8)</a> variables are
- available:</p>
-<dl class="Bl-tag">
- <dt id="vfs.fusefs.kernelabi_major"><var class="Va">vfs.fusefs.kernelabi_major</var></dt>
- <dd>Major version of the FUSE kernel ABI supported by this driver.</dd>
- <dt id="vfs.fusefs.kernelabi_minor"><var class="Va">vfs.fusefs.kernelabi_minor</var></dt>
- <dd>Minor version of the FUSE kernel ABI supported by this driver.</dd>
- <dt id="vfs.fusefs.data_cache_mode"><var class="Va">vfs.fusefs.data_cache_mode</var></dt>
- <dd>Controls how <code class="Nm">fusefs</code> will cache file data for
- pre-7.23 file systems. A value of 0 will disable caching entirely. Every
- data access will be forwarded to the daemon. A value of 1 will select
- write-through caching. Reads will be cached in the VFS layer as usual.
- Writes will be immediately forwarded to the daemon, and also added to the
- cache. A value of 2 will select write-back caching. Reads and writes will
- both be cached, and writes will occasionally be flushed to the daemon by
- the page daemon. Write-back caching is usually unsafe, especially for FUSE
- file systems that require network access.
- <p class="Pp">FUSE file systems using protocol 7.23 or later specify their
- cache behavior on a per-mountpoint basis, ignoring this sysctl.</p>
- </dd>
- <dt id="vfs.fusefs.stats.filehandle_count"><var class="Va">vfs.fusefs.stats.filehandle_count</var></dt>
- <dd>Current number of open FUSE file handles.</dd>
- <dt id="vfs.fusefs.stats.lookup_cache_hits"><var class="Va">vfs.fusefs.stats.lookup_cache_hits</var></dt>
- <dd>Total number of lookup cache hits.</dd>
- <dt id="vfs.fusefs.stats.lookup_cache_misses"><var class="Va">vfs.fusefs.stats.lookup_cache_misses</var></dt>
- <dd>Total number of lookup cache misses.</dd>
- <dt id="vfs.fusefs.stats.node_count"><var class="Va">vfs.fusefs.stats.node_count</var></dt>
- <dd>Current number of allocated FUSE vnodes.</dd>
- <dt id="vfs.fusefs.stats.ticket_count"><var class="Va">vfs.fusefs.stats.ticket_count</var></dt>
- <dd>Current number of allocated FUSE tickets, which is roughly equal to the
- number of FUSE operations currently being processed by daemons.</dd>
-</dl>
-</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">mount_fusefs(8)</a></p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="HISTORY"><a class="permalink" href="#HISTORY">HISTORY</a></h1>
-<p class="Pp">The <code class="Nm">fuse</code> driver was written as the part of
- the <span class="Ux">FreeBSD</span> implementation of the FUSE userspace
- file system framework (see
- <a class="Lk" href="https://github.com/libfuse/libfuse">https://github.com/libfuse/libfuse</a>)
- and first appeared in the <span class="Pa">sysutils/fusefs-kmod</span> port,
- supporting <span class="Ux">FreeBSD 6.0</span>. It was added to the base
- system in <span class="Ux">FreeBSD 10.0</span>, and renamed to
- <code class="Nm">fusefs</code> for <span class="Ux">FreeBSD 12.1</span>.</p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="AUTHORS"><a class="permalink" href="#AUTHORS">AUTHORS</a></h1>
-<p class="Pp">The <code class="Nm">fuse</code> driver was originally written by
- <span class="An">Csaba Henk</span> as a Google Summer of Code project in
- 2005. It was further developed by <span class="An">Ilya Putsikau</span>
- during Google Summer of Code 2011, and that version was integrated into the
- base system by <span class="An">Attilio Rao</span>
- &lt;<a class="Mt" href="mailto:attilio@FreeBSD.org">attilio@FreeBSD.org</a>&gt;.</p>
-<p class="Pp">This manual page was written by <span class="An">Alan
- Somers</span>
- &lt;<a class="Mt" href="mailto:asomers@FreeBSD.org">asomers@FreeBSD.org</a>&gt;.</p>
-</section>
-</div>
-<table class="foot">
- <tr>
- <td class="foot-date">July 31, 2019</td>
- <td class="foot-os">FreeBSD 15.0</td>
- </tr>
-</table>