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been repo-copied.

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-.\" Copyright (c) 1980, 1989, 1991, 1993
-.\"	The Regents of the University of California.  All rights reserved.
-.\"
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-.\" modification, are permitted provided that the following conditions
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-.\"    notice, this list of conditions and the following disclaimer.
-.\" 2. Redistributions in binary form must reproduce the above copyright
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-.\"    documentation and/or other materials provided with the distribution.
-.\" 3. All advertising materials mentioning features or use of this software
-.\"    must display the following acknowledgement:
-.\"	This product includes software developed by the University of
-.\"	California, Berkeley and its contributors.
-.\" 4. Neither the name of the University nor the names of its contributors
-.\"    may be used to endorse or promote products derived from this software
-.\"    without specific prior written permission.
-.\"
-.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
-.\"
-.\"     @(#)mount.8	8.8 (Berkeley) 6/16/94
-.\" $FreeBSD$
-.\"
-.Dd June 16, 1994
-.Dt MOUNT 8
-.Os BSD 4
-.Sh NAME
-.Nm mount
-.Nd mount file systems
-.Sh SYNOPSIS
-.Nm
-.Op Fl adfpruvw
-.Op Fl t Ar ufs | lfs | external_type
-.Nm
-.Op Fl dfpruvw
-.Ar special | node
-.Nm
-.Op Fl dfpruvw
-.Op Fl o Ar options
-.Op Fl t Ar ufs | lfs | external_type
-.Ar special node
-.Sh DESCRIPTION
-The
-.Nm
-command
-calls the
-.Xr mount 2
-system call to prepare and graft a
-.Ar "special device"
-or the remote node (rhost:path) on to the file system tree at the point
-.Ar node .
-If either
-.Ar special
-or
-.Ar node
-are not provided, the appropriate information is taken from the
-.Xr fstab 5
-file.
-.Pp
-The system maintains a list of currently mounted file systems.
-If no arguments are given to
-.Nm ,
-this list is printed.
-.Pp
-The options are as follows:
-.Bl -tag -width indent
-.It Fl a
-All the filesystems described in
-.Xr fstab 5
-are mounted.
-Exceptions are those marked as ``noauto'', excluded by the
-.Fl t
-flag (see below), or if they are already mounted (except the
-root filesystem which is always remounted to preserve
-traditional single user mode behavior).
-.It Fl d
-Causes everything to be done except for the actual system call.
-This option is useful in conjunction with the
-.Fl v
-flag to
-determine what the
-.Nm
-command is trying to do.
-.It Fl f
-Forces the revocation of write access when trying to downgrade
-a filesystem mount status from read-write to read-only.
-Also
-forces the R/W mount of an unclean filesystem (dangerous; use with
-caution).
-.It Fl o
-Options are specified with a
-.Fl o
-flag followed by a comma separated string of options.
-In case of conflicting options being specified, the rightmost option
-takes effect.
-The following options are available:
-.Bl -tag -width indent
-.It async
-All
-.Tn I/O
-to the file system should be done asynchronously.
-This is a
-.Em dangerous
-flag to set,
-and should not be used unless you are prepared to recreate the file
-system should your system crash.
-.It current
-When used with the
-.Fl u
-flag, this is the same as specifying the options currently in effect for
-the mounted filesystem.
-.It force
-The same as
-.Fl f ;
-forces the revocation of write access when trying to downgrade
-a filesystem mount status from read-write to read-only.
-Also
-forces the R/W mount of an unclean filesystem (dangerous; use with caution).
-.It fstab
-When used with the
-.Fl u
-flag, this is the same as specifying all the options listed in the
-.Xr fstab 5
-file for the filesystem.
-.It noasync
-Metadata I/O should be done synchronously, while data I/O should be done
-asynchronously.  This is the default.
-.It noatime
-Do not update the file access time when reading from a file.
-This option
-is useful on filesystems where there are large numbers of files and
-performance is more critical than updating the file access time (which is
-rarely ever important). This option is currently only supported on local
-filesystems.
-.It noauto
-This filesystem should be skipped when mount is run with the
-.Fl a
-flag.
-.It noclusterr
-Disable read clustering.
-.It noclusterw
-Disable write clustering.
-.It nodev
-Do not interpret character or block special devices on the file system.
-This option is useful for a server that has file systems containing
-special devices for architectures other than its own.
-.It noexec
-Do not allow execution of any binaries on the mounted file system.
-This option is useful for a server that has file systems containing
-binaries for architectures other than its own.
-.It nosuid
-Do not allow set-user-identifier or set-group-identifier bits to take effect.
-Note: this option is worthless if a public available suid or sgid
-wrapper like
-.Xr suidperl 1
-is installed on your system.
-.It nosymfollow
-Do not follow symlinks
-on the mounted file system.
-.It rdonly
-The same as
-.Fl r ;
-mount the file system read-only (even the super-user may not write it).
-.It sync
-All
-.Tn I/O
-to the file system should be done synchronously.
-.It suiddir
-A directory on the mounted filesystem will respond to the SUID bit 
-being set, by setting the owner of any new files to be the same
-as the owner of the directory.
-New directories will inherit the bit from their parents.
-Execute bits are removed from
-the file, and it will not be given to root.
-.Pp
-This feature is designed for use on fileservers serving PC users via
-ftp, SAMBA, or netatalk.
-It provides security holes for shell users and as
-such should not be used on shell machines, especially on home directories.
-This option requires the SUIDDIR
-option in the kernel to work.
-Only UFS filesystems support this option.
-See
-.Xr chmod 2
-for more information.
-.It update
-The same as
-.Fl u ;
-indicate that the status of an already mounted file system should be changed.
-.It union
-Causes the namespace at the mount point to appear as the union
-of the mounted filesystem root and the existing directory.
-Lookups will be done in the mounted filesystem first.
-If those operations fail due to a non-existent file the underlying
-directory is then accessed.
-All creates are done in the mounted filesystem.
-.El
-.Pp
-Any additional options specific to a filesystem type that is not
-one of the internally known types (see the
-.Fl t
-option) may be passed as a comma separated list; these options are
-distinguished by a leading
-.Dq \&-
-(dash).
-Options that take a value are specified using the syntax -option=value.
-For example, the
-.Nm
-command:
-.Bd -literal -offset indent
-mount -t mfs -o nosuid,-N,-s=4000 /dev/dk0b /tmp
-.Ed
-.Pp
-causes
-.Nm
-to execute the equivalent of:
-.Bd -literal -offset indent
-/sbin/mount_mfs -o nosuid -N -s 4000 /dev/dk0b /tmp
-.Ed
-.Pp
-Additional options specific to filesystem types
-which are not internally known
-(see the description of the
-.Fl t
-option below)
-may be described in the manual pages for the associated
-.Pa /sbin/mount_ Ns Sy XXX
-utilities.
-.It Fl p
-Print mount information in fstab format.
-Implies also the
-.Fl v
-option.
-.It Fl r
-The file system is to be mounted read-only.
-Mount the file system read-only (even the super-user may not write it).
-The same as the
-.Dq rdonly
-argument to the
-.Fl o
-option.
-.It Fl t Ar "ufs \\*(Ba lfs \\*(Ba external type"
-The argument following the
-.Fl t
-is used to indicate the file system type.
-The type
-.Ar ufs
-is the default.
-The 
-.Fl t
-option can be used
-to indicate that the actions should only be taken on
-filesystems of the specified type.
-More than one type may be specified in a comma separated list.
-The list of filesystem types can be prefixed with
-.Dq no
-to specify the filesystem types for which action should
-.Em not
-be taken.
-For example, the
-.Nm
-command:
-.Bd -literal -offset indent
-mount -a -t nonfs,mfs
-.Ed
-.Pp
-mounts all filesystems except those of type
-.Tn NFS
-and
-.Tn MFS .
-.Pp
-If the type is not one of the internally known types,
-.Nm
-will attempt to execute a program in
-.Pa /sbin/mount_ Ns Sy XXX
-where
-.Sy XXX
-is replaced by the type name.
-For example, nfs filesystems are mounted by the program
-.Pa /sbin/mount_nfs .
-.Pp
-Most filesystems will be dynamically loaded by their mount programs
-if not already present in the kernel, using the
-.Xr vfsload 3
-subroutine.  Because this mechanism requires writable temporary space,
-the filesystem type containing
-.Pa /tmp
-must be compiled into the kernel, and the filesystems containing
-.Pa /tmp 
-and
-.Pa /usr/bin/ld 
-must be listed in
-.Pa /etc/fstab
-before any filesystems which might be dynamically loaded.
-.It Fl u
-The
-.Fl u
-flag indicates that the status of an already mounted file
-system should be changed.
-Any of the options discussed above (the
-.Fl o
-option)
-may be changed;
-also a file system can be changed from read-only to read-write
-or vice versa.
-An attempt to change from read-write to read-only will fail if any
-files on the filesystem are currently open for writing unless the
-.Fl f
-flag is also specified.
-The set of options is determined by applying the options specified 
-in the argument to 
-.Fl o 
-and finally applying the
-.Fl r
-or
-.Fl w
-option.
-.It Fl v
-Verbose mode.
-.It Fl w
-The file system object is to be read and write.
-.El
-.Sh DIAGNOSTICS
-Various, most of them are self-explanatory.
-.Pp
-.Dl XXXXX filesystem is not available
-.Pp
-The kernel doesn't support the respective filesystem type.  Note that
-support for a particular filesystem might be provided either on a static
-(kernel compile-time), or dynamic basis (loaded as a kernel module by
-.Xr kldload 8 ) .
-Normally,
-.Nm
-or its subprocesses attempt to dynamically load a filesystem module if
-it hasn't been configured statically, using
-.Xr vfsload 3 .
-In this case, the above error message can also mean that you didn't
-have permission to load the module.
-.Sh FILES
-.Bl -tag -width /etc/fstab -compact
-.It Pa /etc/fstab
-file system table
-.El
-.Sh SEE ALSO
-.Xr mount 2 ,
-.Xr vfsload 3 ,
-.Xr fstab 5 ,
-.Xr kldload 8 ,
-.Xr mount_cd9660 8 ,
-.Xr mount_devfs 8 ,
-.Xr mount_fdesc 8 ,
-.Xr mount_mfs 8 ,
-.Xr mount_msdos 8 ,
-.Xr mount_nfs 8 ,
-.Xr mount_null 8 ,
-.Xr mount_portal 8 ,
-.Xr mount_procfs 8 ,
-.Xr mount_umap 8 ,
-.Xr mount_union 8 ,
-.Xr umount 8
-.Sh BUGS
-It is possible for a corrupted file system to cause a crash.
-.Sh CAVEATS
-After a successful mount, the permissions on the original mount point 
-determine if 
-.Pa ".."
-is accessible from the mounted file system.  The minimum permissions for
-the mount point for traversal across the mount point in both 
-directions to be possible for all users is 0111 (execute for all).
-.Sh HISTORY
-A
-.Nm
-command appeared in
-.At v1 .