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81 lines
2.3 KiB
Groff
81 lines
2.3 KiB
Groff
.\"
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.\" Copyright (c) 2008 Daniel Gerzo
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS DOCUMENTATION IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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.\"
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.Dd March 15, 2022
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.Dt NULLFS 5
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.Os
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.Sh NAME
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.Nm nullfs
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.Nd "null file system"
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.Sh SYNOPSIS
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To enable support for this driver,
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place the following line in the kernel configuration file:
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.Bd -ragged -offset indent
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.Cd "options NULLFS"
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.Ed
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.Pp
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Alternatively, to load the driver as a
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module at boot time, place the following line in
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.Xr loader.conf 5 :
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.Bd -literal -offset indent
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nullfs_load="YES"
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.Ed
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.Sh DESCRIPTION
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The
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.Nm
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driver will permit the
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.Fx
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kernel to mount a loopback file system sub-tree.
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.Sh EXAMPLES
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To mount a
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.Nm
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file system:
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.Pp
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.Dl "mount_nullfs /usr/ports /home/devel/ports"
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.Pp
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It is also possible to define an entry in
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.Xr fstab 5
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that looks similar to:
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.Pp
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.Bd -literal
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/usr/ports /home/devel/ports nullfs rw 0 0
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.Ed
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.Sh SEE ALSO
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.Xr fstab 5 ,
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.Xr mount_nullfs 8
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.Sh HISTORY
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The
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.Nm
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layer first appeared in
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.Bx 4.4 .
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.Sh AUTHORS
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.An -nosplit
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The
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.Nm
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kernel implementation was written by
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.An John Heideman .
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.Pp
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This manual page was written by
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.An Daniel Gerzo Aq Mt danger@FreeBSD.org .
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