fusefs: add a fusefs(5) man page
PR: 233393 Reported by: tech-lists@zyxst.net Reviewed by: cem MFC after: 2 weeks Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D19651
This commit is contained in:
parent
d483391306
commit
084e97b866
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=346186
@ -27,6 +27,7 @@ MAN= acct.5 \
|
||||
forward.5 \
|
||||
fs.5 \
|
||||
fstab.5 \
|
||||
fusefs.5 \
|
||||
group.5 \
|
||||
hosts.5 \
|
||||
hosts.equiv.5 \
|
||||
|
147
share/man/man5/fusefs.5
Normal file
147
share/man/man5/fusefs.5
Normal file
@ -0,0 +1,147 @@
|
||||
.\"
|
||||
.\" SPDX-License-Identifier: BSD-2-Clause-FreeBSD
|
||||
.\"
|
||||
.\" Copyright (c) 2019 The FreeBSD Foundation
|
||||
.\"
|
||||
.\" This software was developed by BFF Storage Systems, LLC under sponsorship
|
||||
.\" from the FreeBSD Foundation.
|
||||
.\"
|
||||
.\" Redistribution and use in source and binary forms, with or without
|
||||
.\" modification, are permitted provided that the following conditions
|
||||
.\" are met:
|
||||
.\" 1. Redistributions of source code must retain the above copyright
|
||||
.\" notice, this list of conditions and the following disclaimer.
|
||||
.\" 2. Redistributions in binary form must reproduce the above copyright
|
||||
.\" notice, this list of conditions and the following disclaimer in the
|
||||
.\" documentation and/or other materials provided with the distribution.
|
||||
.\"
|
||||
.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
|
||||
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
||||
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
||||
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
||||
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
||||
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
||||
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
||||
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
||||
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
||||
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
||||
.\" SUCH DAMAGE.
|
||||
.\"
|
||||
.\" $FreeBSD$
|
||||
.Dd April 13, 2019
|
||||
.Dt FUSEFS 5
|
||||
.Os
|
||||
.Sh NAME
|
||||
.Nm fusefs
|
||||
.Nd "File system in USErspace"
|
||||
.Sh SYNOPSIS
|
||||
To link into the kernel:
|
||||
.Bd -ragged -offset indent
|
||||
.Cd "options FUSEFS"
|
||||
.Ed
|
||||
.Pp
|
||||
To load as a loadable kernel module:
|
||||
.Pp
|
||||
.Dl "kldload fusefs"
|
||||
.Sh DESCRIPTION
|
||||
The
|
||||
.Nm
|
||||
driver implements a file system that is serviced by a userspace program.
|
||||
.Pp
|
||||
There are many uses for
|
||||
.Nm .
|
||||
Userspace daemons can access libraries or programming languages that cannot run
|
||||
in kernel-mode, for example.
|
||||
.Nm
|
||||
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
|
||||
.Nm
|
||||
API is portable.
|
||||
Many daemons can run on multiple operating systems with minimal modifications.
|
||||
.Sh SYSCTL VARIABLES
|
||||
The following variables are available as both
|
||||
.Xr sysctl 8
|
||||
variables and
|
||||
.Xr loader 8
|
||||
tunables:
|
||||
.Bl -tag -width indent
|
||||
.It Va vfs.fusefs.kernelabi_major
|
||||
Major version of the FUSE kernel ABI supported by this driver.
|
||||
.It Va vfs.fusefs.kernelabi_minor
|
||||
Minor version of the FUSE kernel ABI supported by this driver.
|
||||
.It Va vfs.fusefs.data_cache_mode
|
||||
Controls how
|
||||
.Nm
|
||||
will cache file data.
|
||||
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.
|
||||
.It Va vfs.fusefs.lookup_cache_enable
|
||||
Controls whether
|
||||
.Nm
|
||||
will cache lookup responses from the file system.
|
||||
FUSE file systems indicate whether lookup responses should be cacheable, but
|
||||
it may be useful to globally disable caching them if a file system is
|
||||
misbehaving.
|
||||
.\" Undocumented sysctls
|
||||
.\" ====================
|
||||
.\" Counters: I intend to rename to vfs.fusefs.stats.* for clarity
|
||||
.\" vfs.fusefs.lookup_cache_{hits, misses}
|
||||
.\" vfs.fusefs.filehandle_count
|
||||
.\" vfs.fusefs.ticker_count
|
||||
.\" vfs.fusefs.node_count
|
||||
.\"
|
||||
.\" vfs.fusefs.version - useless since the driver moved in-tree
|
||||
.\" vfs.fusefs.reclaim_revoked: I don't understand it well-enough
|
||||
.\" vfs.fusefs.sync_unmount: dead code
|
||||
.\" vfs.fusefs.enforce_dev_perms: I don't understand it well enough.
|
||||
.\" vfs.fusefs.init_backgrounded: dead code
|
||||
.\" vfs.fusefs.iov_credit: I don't understand it well enough
|
||||
.\" vfs.fusefs.iov_permanent_bufsize: I don't understand it well enough
|
||||
.\" vfs.fusefs.fix_broken_io: I don't understand it well enough
|
||||
.\" vfs.fusefs.sync_resize: useless and should be removed
|
||||
.\" vfs.fusefs.refresh_size: probably useless?
|
||||
.\" vfs.fusefs.mmap_enable: why is this optional?
|
||||
.\" vfs.fusefs.data_cache_invalidate: what is this needed for?
|
||||
.Sh SEE ALSO
|
||||
.Xr mount_fusefs 8
|
||||
.Sh HISTORY
|
||||
The
|
||||
.Nm fuse
|
||||
driver was written as the part of the
|
||||
.Fx
|
||||
implementation of the FUSE userspace file system framework (see
|
||||
.Xr https://github.com/libfuse/libfuse )
|
||||
and first appeared in the
|
||||
.Pa sysutils/fusefs-kmod
|
||||
port, supporting
|
||||
.Fx 6.0 .
|
||||
It was added to the base system in
|
||||
.Fx 10.0 ,
|
||||
and renamed to
|
||||
.Nm
|
||||
for
|
||||
.Fx 12.1 .
|
||||
.Sh AUTHORS
|
||||
.An -nosplit
|
||||
The
|
||||
.Nm fuse
|
||||
driver was originally written by
|
||||
.An Csaba Henk
|
||||
as a Google Summer of Code project in 2005.
|
||||
It was further developed by
|
||||
.An Ilya Putsikau
|
||||
during Google Summer of Code 2011, and that version was integrated into the
|
||||
base system by
|
||||
.An Attilio Rao Aq Mt attilio@FreeBSD.org .
|
||||
.Pp
|
||||
This manual page was written by
|
||||
.An Alan Somers Aq Mt asomers@FreeBSD.org .
|
Loading…
Reference in New Issue
Block a user