MOUNT_MSDOS(8) OpenBSD System Manager's Manual MOUNT_MSDOS(8)NAMEmount_msdos - mount an MS-DOS file system
SYNOPSISmount_msdos [-9lsx] [-g gid] [-m mask] [-o options] [-u uid] special node
DESCRIPTION
The mount_msdos command attaches the MS-DOS file system residing on the
device special to the global file system namespace at the location
indicated by node. This command is invoked by mount(8) when using the
syntax
mount [options] -t msdos special node
The special device must correspond to a partition registered in the
disklabel(5).
This command is normally executed by 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).
The options are as follows:
-9 Ignore the special Windows 95/98 directory entries even if
deleting or renaming a file. This forces -s.
-g gid Set the group of the files in the file system to gid. The
default group is the group of the directory on which the file
system is being mounted.
-l Force listing and generation of Windows 95/98 long filenames and
separate creation/modification/access dates.
If neither -s nor -l are given, mount_msdos searches the root
directory of the file system to be mounted for any existing
Windows 95/98 long filenames. If no such entries are found, -s
is the default. Otherwise -l is assumed.
-m mask
Specify the maximum permissions for files and directories in the
file system. Only the nine low-order bits of mask are used.
-o options
Use the specified mount options, as described in mount(8).
-s Force behaviour to ignore and not generate Windows 95/98 long
filenames.
If neither -s nor -l are given, mount_msdos searches the root
directory of the file system to be mounted for any existing
Windows 95/98 long filenames. If no such entries are found, -s
is the default. Otherwise -l is assumed.
-u uid Set the owner of the files in the file system to uid. The
default owner is the owner of the directory on which the file
system is being mounted.
-x If a directory is readable, it inherits the x attribute as well.
File permissions for FAT file systems are imitated, since the file system
has no real concept of permissions. The default mask is taken from the
directory on which the file system is being mounted, except when the -m
option is used. FAT does have a ``read only'' mode, in which the
writable bit is unset. If such files are found, they are marked non-
writable; it can be set using chmod -w or unset using chmod +w.
File modes work the same way for directories. However if a directory is
mounted with -x, it will inherit the executable bit if it is readable.
This can be useful for making files non-executable and directories
executable: using -x -m 644 will in most cases give permissions of 755
for directories and 644 for files. See chmod(1) for more information
about octal file modes.
SEE ALSOchmod(1), mount(2), disklabel(5), fstab(5), disklabel(8), mount(8),
umount(8)HISTORY
The mount_msdos utility first appeared in NetBSD 0.9. Its predecessor,
the mount_pcfs utility, appeared in NetBSD 0.8, and was abandoned in
favor of the more aptly named mount_msdos.
CAVEATS
The maximum file size supported by the MS-DOS file system is one byte
less than 4GB. This is a FAT file system limitation, documented by
Microsoft in Knowledge Base article 314463.
The MS-DOS file system (even with long filenames) does not support
filenames with trailing dots or spaces. Any such characters will be
silently removed before the directory entry is written. This too is a
FAT file system limitation.
The use of the -9 flag could result in damaged file systems, albeit the
damage is in part taken care of by procedures similar to the ones used in
Windows 95/98.
The default handling for -s and -l will result in empty file systems
being populated with short filenames only. To generate long filenames on
empty DOS file systems use -l.
Note that Windows 95/98 handles only access dates, but not access times.
OpenBSD 4.9 October 14, 2010 OpenBSD 4.9
