.\"	$OpenBSD: mount_ffs.8,v 1.18 2016/10/06 13:16:21 schwarze Exp $
.\"	$NetBSD: mount_ffs.8,v 1.2 1996/02/05 06:33:47 jtc Exp $
.\"
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.\"     @(#)mount.8	8.7 (Berkeley) 3/27/94
.\"
.Dd $Mdocdate: October 6 2016 $
.Dt MOUNT_FFS 8
.Os
.Sh NAME
.Nm mount_ffs
.Nd mount a Berkeley Fast File System
.Sh SYNOPSIS
.Nm mount_ffs
.Op Fl o Ar options
.Ar special node
.Sh DESCRIPTION
The
.Nm
command attaches the Berkeley Fast File System on the
.Ar special
device on to the file system tree at point
.Ar node .
.Pp
This command is invoked by
.Xr mount 8
when using any of the following syntax:
.Bd -ragged -offset 4n
.Nm mount Op options
.Ar special Ar node
.br
.Nm mount Op options
-t ffs
.Ar special Ar node
.br
.Ed
.Pp
The
.Ar special
device is either a
.Xr disklabel 8
UID (DUID) or an entry in
.Pa /dev .
If it is a DUID,
it will be automatically mapped to the appropriate entry in
.Pa /dev .
In either case the partition must be present
in the disklabel loaded from the device.
The partition name is the last letter in the entry name.
For example, /dev/sd0a and 3eb7f9da875cb9ee.a both refer to the
.Sq a
partition.
.Pp
This command is normally executed per file system by
.Xr rc 8
at boot time using the
.Xr mount 8
command.
The options are as follows:
.Bl -tag -width Ds
.It Fl o Ar options
Options are specified with a
.Fl o
flag followed by a comma separated string of options.
See the
.Xr mount 8
man page for possible options and their meanings.
.El
.Sh SEE ALSO
.Xr mount 2 ,
.Xr disklabel 5 ,
.Xr fstab 5 ,
.Xr disklabel 8 ,
.Xr mount 8 ,
.Xr umount 8
.Sh HISTORY
A
.Nm
command appeared in
.Nx 1.1 .
.Sh BUGS
It is possible for a corrupted file system to cause a crash.