fdmount(1) General Commands Manual fdmount(1)
Name
fdmount - Floppy disk mount utility
Note
This manpage has been automatically generated from fdutils's texinfo documentation. However, this process is only approximative, and some
items, such as cross-references, footnotes and indices are lost in this translation process. Indeed, these items have no appropriate rep-
resentation in the manpage format. Moreover, only the items specific to each command have been translated, and the general information
about fdutils has been dropped in the manpage version. Thus I strongly advise you to use the original texinfo doc.
* To generate a printable copy from the texinfo doc, run the following commands:
./configure; make dvi; dvips fdutils.dvi
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The texinfo doc looks most pretty when printed or as HTML. Indeed, in the info version certain examples are difficult to read due to the
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Description
fdmount [-l] [--list] [-d] [--daemon] [--detach]
[-i interval] [--interval interval] [-o mount-options]
[-r] [-readonly] [-s] [--sync] [--nosync] [--nodev]
[--nosuid] [--noexec] [-f] [--force] [-h] [--help]
[drivename] [mountpoint]
fdumount [-f] [--force] [drivename]
fdlist
fdmountd [-i interval] [--interval interval] [-r]
[-readonly] [-s] [--sync] [--nosync] [--nodev]
[--nosuid] [--noexec] [--help] [drivename] [mountpoint]]
The fdmount program mounts a floppy disk in the specified drive. It tries to figure out the exact format and filesystem type of the disk
from data in the disk's boot sector or super block and the auto-detected track layout.
Currently, fdmount supports the filesystems minix, ext, ext2, xia, and msdos, and includes special support for disks formatted by the 2M
utility for MS-DOS.
It also checks whether the disk is write protected, in which case it is mounted read-only.
The symbolic drivename is (currently) one of `fd[0-7]', corresponding to the special device files `/dev/fd[0-7]'. If drivename is not spec-
ified, `fd0' is assumed.
The disk is mounted on the directory mountpoint, if specified, or on `/fd[0-7]'. In either case, the mount point must be an existing,
writable directory.
Due to a bug in the floppy driver (?), the polling interval (-i flag) must be longer than the spindown offset. Thus you need to do (for
example) floppycontrol --spindown 99 before starting fdmountd in daemon mode
Options
-l --list
List all known drives with their symbolic name, type, and mount status.
-d --daemon
Run in daemon mode (see below).
--detach
Runs daemon in background, and detaches it from its tty. Messages produced after the fork are logged to syslog.
-p file
--pidfile file
Dumps the process id of the daemon to file. This makes killing the daemon easier: kill -9 `cat file`
-i interval
--interval interval
Set the polling interval for daemon mode. The unit for interval is 0.1 seconds, the default value is 10 (i.e. 1 second).
-o options
--options options
Sets filesystem-specific options. So far, these are only available for DOS and Ext2 disks. The following DOS options are supported:
check, conv, dotsOK, debug, fat, quiet, blocksize. The following Ext2 options are supported: check, errors, grpid, bsdgroups, nogr-
pid, sysvgroups, bsddf, minixdf, resgid, debug, nocheck. When running as a daemon, options not applying to the disk that is
inserted (because of its filesystem type) are not passed to mount.
-r --readonly
Mount the disk read-only. This is automatically assumed if the disk is write protected.
-s --sync
Mount with the SYNC option.
--nosync
Mounts without the SYNC option, even when running as daemon.
--nodev
Mount with the NODEV option. Ignored for msdos filesystems, otherwise always set for non-root users.
--nosuid
Mount with the NOSUID option. Ignored for msdos filesystems, otherwise always set for non-root users.
--noexec
Mount with the NOEXEC option.
-f --force
Attempt a mount or unmount operation even `/etc/mtab' says that the drive is already mounted, or not mounted, respectively. This
option is useful if `/etc/mtab' got out of sync with the actual state for some reason.
-h --help
Show short parameter description
Security
When mounting on the default mount point, the mount points' owner is set to the current user, and the access flags according to the user's
umask. For a specified mountpoint, owner and permissions are left unchanged. Default mount points are called /fd0, /fd1, ... , /fd7.
The user running fdmount must have read access to the floppy device for read only mounts, and read/write access for read/write mounts.
Fdmount can be run suid root, allowing users to mount floppy disks. The following restrictions are placed upon non-root users:
* If a mountpoint is specified explicitly, it must be owned by the user.
* A user may only unmount a disk if the mount point is owned by the user, or if it the disk has been mounted by the same user.
* Non-msdos disks are automatically mounted with the nodev and nosuid flags set.
However, do not rely on fdmount being secure at the moment.
Daemon mode
In daemon mode, the specified drive is periodically checked and if a disk is inserted, it is automatically mounted.
When the disk is removed, it is automatically unmounted. However, it is recommended to unmount the disk manually before removing it. In
order to limit corruption, disks are mounted with the SYNC option when running in daemon mode, unless the --nosync flag is given.
Note that this mode has some potential drawbacks:
* Some floppy drives have to move the drive head physically in order to reset the disk change signal. It is strongly recommended not
to use daemon mode with these drives. See section floppycontrol, for details.
* If a disk does not contain a filesystem (e.g. a tar archive), the mount attempt may slow down initial access.
* As fdmount cannot identify the user trying to use the disk drive, there is no way to protect privacy. Disks are always mounted with
public access permissions set.
Diagnostics
error opening device name
error reading boot/super block
fdmount failed to read the first 1K of the disk. The disk might be damaged, unformatted, or it may have a format which is unsup-
ported by the FDC or the Linux kernel.
unknown filesystem type
No magic number of any of the supported filesystems (see above) could be identified.
sorry, can't figure out format (fs filesystem)
The size of the filesystem on the disk is incompatible with the track layout detected by the kernel and an integer number of tracks.
This may occur if the filesystem uses only part of the disk, or the track layout was detected incorrectly by the kernel.
failed to mount fs> <sizeK-disk
The actual mount system call failed.
failed to unmount
The actual unmount system call failed.
cannot create lock file /etc/mtab~
If `/etc/mtab~' exists, you should probably delete it. Otherwise, check permissions.
Can't access mountpoint
Most probably, the default or specified mount point does not exist. Use mkdir.
mountpoint is not a directory
The mountpoint is not a directory.
not owner of mountpoint
Non-root users must own the directory specified as mount point. (This does not apply for the default mount points, /fd[0-3].)
No write permission to mountpoint
Non-root users must have write permission on the mount point directory.
Not owner of mounted directory: UID=uid
Non-root users cannot unmount if the mount point is owned (i.e. the disk was mounted) by another user.
invalid drive name
Valid drive names are `fd0', `fd1', etc.
drive name does not exist
The drive does not exist physically, is unknown to the Linux kernel, or is an unknown type.
Drive name is mounted already
Trying to mount a drive which appears to be mounted already. Use the --force option if you think this is wrong.
Drive name is not mounted
Trying to unmount a drive which does not appear to be mounted. Use the --force option if you think this is wrong.
ioctl(...) failed
If this occurs with the FDGETDRVTYP or FDGETDRVSTAT, ioctl's you should probably update your Linux kernel.
mounted fs size-disk (options)
Success message.
Bugs
* Fdmount should be more flexible about drive names and default mount points (currently hard coded).
* Probably not very secure yet (when running suid root). Untested with ext and xia filesystems.
* Can't specify filesystem type and disk layout explicitly.
* In daemon mode, the drive light stays on all the time.
* Some newer filesystem types, such as vfat are not yet supported.
See Also
Fdutils' texinfo doc
fdutils-5.5 03Mar05 fdmount(1)