fdlist

NAME

       fdmount - Floppy disk mount utility

SYNOPSIS

       fdmount [-l] [--list] [-d] [--daemon] [--detach] [-i
       interval ] [--interval interval ] [-o 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] [--nodev] [--nosuid] [--noexec]
       [drivename [mountpoint] ]

DESCRIPTION

       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 ms-dos 2M utility.

       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], cor-
       responding  to  the  special device files /dev/fd[0-7]. If
       drivename is not specified, fd0 is assumed.

       The disk is mounted on the directory mountpoint, if speci-
       fied,  or  on  /fd[0-7].   In either case, the mount point
       must be an existing, writable directory.

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 --pidfile file
              Dumps  the  process  id of the daemon to file. This
              makes killing the daemon easier: kill -9 `cat file`


       -i --interval interval
              Set  the  polling interval for daemon mode. Unit is
              0.1 seconds, default is 10 (1 second).


       -o --options options
              Sets filesystem-specific options. So far, these are
              only  available for DOS and Ext2 disks. The follow-
              ing DOS options are supported: check, conv, dotsOK,
              debug,  fat,  quiet, blocksize.  The following Ext2
              options are supported: check, errors,  grpid,  bsd-
              groups,  nogrpid,  sysvgroups, bsddf, minixdf, res-
              gid, 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 as-
              sumed if the disk is write protected.


       -s --sync
              Mount with the SYNC option.


       --nosync
              Mounts without the SYNC option, even when not  run-
              ning 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.  De-
       fault 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 mo-
       ment.

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.  Re-
       fer to the floppycontrol(1) documentation for details.

       It  is  not  possible  to  specify  special  options, like
       --readonly, to modify the mount process.

       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 al-
       ways 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 have a
              format unsupported by the FDC/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 incompat-
              ible 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 ker-
              nel.


       failed to mount <fs> <size>K-disk
              The actual mount(2) system call failed.


       failed to unmount
              The actual unmount(2) 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


       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, fd2, fd3, fd4, fd5,
              fd6, fd7


       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 FDGETDRVTYP or FDGETDRVSTAT,
              you should probably update your Linux kernel.


       mounted <fs> <size>K-disk (<options>)
              Success message.

BUGS

       chown() fails for non-msdos filesystems mounted read-only,
       so the mount point may have the wrong owner.

       Fdmount  should be more flexible about drive names and de-
       fault 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.

FILES

       /dev/fd[0-7] - Floppy devices

       /etc/mtab - Mounted filesystems table

AUTHORS

       Rainer Zimmermann, zimmerm@mathematik.uni-marburg.de Alain
       Knaff, Alain.Knaff@inrialpes.fr

SEE ALSO

       mount(1),   mmount(1),  superformat(1),  floppycontrol(1),
       setfdprm(1)