sbin/mount_msdos/mount_msdos.8

.\"	$NetBSD: mount_msdos.8,v 1.13 1998/02/06 05:57:00 perry Exp $
.\"
.\" Copyright (c) 1993,1994 Christopher G. Demetriou
.\" All rights reserved.
.\"
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.\" modification, are permitted provided that the following conditions
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.\"    must display the following acknowledgment:
.\"      This product includes software developed by Christopher G. Demetriou.
.\" 3. The name of the author may not be used to endorse or promote products
.\"    derived from this software without specific prior written permission
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.\" $FreeBSD: src/sbin/mount_msdos/mount_msdos.8,v 1.19.2.1 2000/12/08 14:03:59 ru Exp $
.\"
.Dd September 10, 2019
.Dt MOUNT_MSDOS 8
.Os
.Sh NAME
.Nm mount_msdos
.Nd mount an MS-DOS file system
.Sh SYNOPSIS
.Nm
.Op Fl 9ls
.Op Fl D Ar DOS_codepage
.Op Fl g Ar gid
.Op Fl L Ar locale
.Op Fl m Ar mask
.Op Fl M Ar mask
.Op Fl o Ar options
.Op Fl u Ar uid
.\".Op Fl G
.Pa special
.Pa node
.Sh DESCRIPTION
The
.Nm
command attaches the MS-DOS filesystem residing on
the device
.Pa special
to the global filesystem namespace at the location
indicated by
.Pa node .
This command is normally executed by
.Xr mount 8
at boot time, but can be used by any user to mount an
MS-DOS file system on any directory that they own (provided,
of course, that they have appropriate access to the device that
contains the file system).
.Pp
The options are as follows:
.Bl -tag -width Ds
.It Fl o Ar options
Use the specified mount
.Ar options ,
as described in
.Xr mount 8 ,
or one of the MS-DOS filesystem-specific options
.Ar shortnames ,
.Ar longnames
or
.Ar nowin95 ,
all of which can be used to affect Windows name translation in the
underlying filesystem.
.It Fl u Ar uid
Set the owner of the files in the file system to
.Ar uid .
The default owner is the owner of the directory
on which the file system is being mounted.
.It Fl g Ar gid
Set the group of the files in the file system to
.Ar gid .
The default group is the group of the directory
on which the file system is being mounted.
.It Fl m Ar mask
Specify the maximum file permissions for files
in the file system.
(For example, a
.Ar mask
of
.Li 755
specifies that, by default, the owner should have
read, write, and execute permissions for files, but
others should only have read and execute permissions.
See
.Xr chmod 1
for more information about octal file modes.)
Only the nine low-order bits of
.Ar mask
are used.
The value of
.Ar -M
is used if it is supplied and
.Ar -m
is omitted.
The default
.Ar mask
is taken from the
directory on which the file system is being mounted.
.It Fl M Ar mask
Specify the maximum file permissions for directories
in the file system.
The value of
.Ar -m
is used if it is supplied and
.Ar -M
is omitted.
See the previous option's description for details.
.It Fl s
Force behaviour to
ignore and not generate Win'95 long filenames.
.It Fl l
Force listing and generation of
Win'95 long filenames
and separate creation/modification/access dates.
.Pp
If neither
.Fl s
nor
.Fl l
are given,
.Nm
searches the root directory of the filesystem to
be mounted for any existing Win'95 long filenames.
If no such entries are found, but short DOS filenames are found,
.Fl s
is the default.
Otherwise
.Fl l
is assumed.
.It Fl 9
Ignore the special Win'95 directory entries even
if deleting or renaming a file.
This forces
.Fl s .
.\".It Fl G
.\"This option causes the filesystem to be interpreted as an Atari-Gemdos
.\"filesystem. The differences to the MS-DOS filesystem are minimal and
.\"limited to the boot block. This option enforces
.\".Fl s .
.It Fl L Ar locale
Specify locale name used for internal uppercase and lowercase conversions
for DOS and Win'95 names.
By default ISO 8859-1 assumed as local character set.
.It Fl D Ar DOS_codepage
Specify the MS-DOS code page (aka IBM/OEM code page) name used for
file name conversions for DOS names.
.El
.Sh SEE ALSO
.Xr mount 2 ,
.Xr unmount 2 ,
.Xr fstab 5 ,
.Xr mount 8
.Sh HISTORY
The predecessor to
.Nm
utility named
.Nm mount_pcfs
appeared in
.Bx 386 .
It was rewritten in
.Nx 1.0
and first appeared in
.Fx 2.0 .
.Sh AUTHORS
Initial implementation as
.Nm mount_pcfs
was written by
.An -nosplit
.An Paul Popelka Aq Mt paulp@uts.amdahl.com .
It was rewritten by
.An Christopher G. Demetriou Aq Mt cgd@NetBSD.org .
.Sh CAVEATS
The use of the
.Fl 9
flag could result in damaged filesystems,
albeit the damage is in part taken care of by
procedures similar to the ones used in Win'95.
.Pp
.Fx 2.1
and earlier versions could not handle cluster sizes larger than 16K.
Just mounting an MS-DOS file system could cause corruption to any
mounted file system.
Cluster sizes larger than 16K are unavoidable for file system sizes
larger than 1G, and also occur when filesystems larger than 1G are
shrunk to smaller than 1G using FIPS.