-.\" Copyright (c) 1980 Regents of the University of California.
-.\" All rights reserved. The Berkeley software License Agreement
-.\" specifies the terms and conditions for redistribution.
+.\" Copyright (c) 1980, 1989 The Regents of the University of California.
+.\" All rights reserved.
.\"
-.\" @(#)mount.8 6.6 (Berkeley) %G%
+.\" Redistribution and use in source and binary forms are permitted
+.\" provided that the above copyright notice and this paragraph are
+.\" duplicated in all such forms and that any documentation,
+.\" advertising materials, and other materials related to such
+.\" distribution and use acknowledge that the software was developed
+.\" by the University of California, Berkeley. The name of the
+.\" University may not be used to endorse or promote products derived
+.\" from this software without specific prior written permission.
+.\" THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
+.\" IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
+.\" WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+.\"
+.\" @(#)mount.8 6.11 (Berkeley) %G%
.\"
.TH MOUNT 8 ""
.UC 4
.SH SYNOPSIS
.B mount
[
-.B \-afrw
+.B \-afrwu
]
.br
.B mount
[
-.B \-frw
+.B \-frwu
]
special | node
.br
.B mount
[
-.B \-frw
+.B \-frwu
] [
.B \-t
-nfs | ufs
+nfs | ufs | external_type
] [
.B \-o
options
.B umount
[
.B \-a
+] [
+.B \-f
]
.br
.B umount
+[
+.B \-f
+]
special | node
.br
.SH DESCRIPTION
The file \fInode\fP must exist already and
it must be a directory. It becomes the name of the newly mounted root.
The optional arguments \fI-r\fP and \fI-w\fP indicate that the file
-system is to be mounted read-only or read-write, respectively. If
-either \fIspecial\fP or \fIfile\fP are not provided, the appropriate
+system is to be mounted read-only or read-write, respectively.
+If either \fIspecial\fP or \fIfile\fP are not provided, the appropriate
information is taken from the \fIfstab\fP file. The \fI-f\fP option
causes everything to be done except for the actual system call; if it's
not obvious, this ``fakes'' mounting the file system.
-The optional argument \fI-t\fP must be followed by \fBnfs\fP or
-\fBufs\fP to indicate the file system type. The type \fBufs\fP is
-the default.
-The \fI-o\fP argument followed by \fIoptions\fP, which is a comma
-separated string of any of the following list,
-can be used to override the defaults for an nfs mount.
+This option is useful in conjunction with the \fI-v\fP flag to
+determine what the
+.I mount
+command is trying to do.
+.PP
+The optional argument \fI-t\fP can be used
+to indicate the file system type.
+The type \fBufs\fP is the default.
+If the type is not one of the internally known types,
+mount will attempt to execute a program in
+.B /sbin/mount_XXX
+where \fBXXX\fP is replaced by the type name.
+The standard mount options (see below) are parsed and
+passed to external program via the \fI-F\fP option
+as a decimal number.
+Any additional options specific to the program can
+be passed as a comma separated list;
+these options are distinguished by starting with a \fI-\fP (dash).
+Those options that take a value are specified
+using the syntax -option=value.
+For example, the mount command:
+.br
+ mount -t mfs -o nosuid,-N,-s=4000 /dev/dk0b /tmp
+.br
+causes mount to attempt to execute:
+.br
+ /sbin/mount_mfs -F 8 -N -s 4000 /dev/dk0b /tmp
+.PP
+Options are specified by a \fI-o\fP argument
+followed by a comma separated string of options.
+The following options apply to any file system that is being mounted:
+.IP "noexec" 12
+Do not allow execution of any binaries on the mounted file system.
+This options is useful for a server that has file systems containing
+binaries for architectures other than its own.
+.IP "nosuid" 12
+Do not allow set-user-identifier or set-group-identifier bits to take effect.
+.IP "nodev" 12
+Do not interpret character or block special devices on the file system.
+This options is useful for a server that has file systems containing
+special devices for architectures other than its own.
+.IP "synchronous" 12
+All I/O to the file system should be done synchronously.
+.PP
+The \fI-u\fP flag indicates that the status of an already mounted file
+system should be changed.
+Any of the options above may be changed;
+also a file system can be changed from read-only to read-write.
+The set of options is determined by first extracting the options
+for the file system from the \fIfstab\fP table,
+then applying any options specified by the \fI-o\fP argument,
+and finally applying the \fI-r\fP or \fI-w\fP option.
.PP
+The following list can be used to override
+the defaults for an nfs mount:
.IP "hard" 12
I/O system calls will retry until the server responds (default)
.IP "soft" 12
announces to the system that the removable file system \fInode\fP
or whatever removable file system was previously mounted on device
\fIspecial\fP should be removed.
+If the \fI-f\fP option is specified for
+.IR umount ,
+the file system is forcibly unmounted.
+Active special devices continue to work,
+but all other files return errors if further accesses are attempted.
+The root file system cannot be forcibly unmounted.
.PP
If the \fI-a\fP option is present for either
.I mount
.I fstab
are mounted or unmounted.
.PP
-The system maintains a list of currently mounted filesystems.
+The system maintains a list of currently mounted file systems.
If invoked without an argument,
.I mount
prints the list.
.SH FILES
/etc/fstab file system table
.SH "SEE ALSO"
-mount(2), fstab(5)
+mount(2), unmount(2), fstab(5)
.SH BUGS
Mounting garbaged file systems will crash the system.
.PP
Mounting a root directory on a non-directory
-makes some apparently good pathnames invalid.
+makes some apparently good path names invalid.
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