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DOSSRV(4)                  Kernel Interfaces Manual                  DOSSRV(4)

       dossrv, 9660srv, a:, b:, c:, d:, 9fat:, dosmnt, eject - DOS and ISO9660
       file systems

       dossrv [ -rsv ] [ -f file ] [ service ]

       9660srv [ -9Jsv ] [ -c clusters ] [ -f file ] [ service ]





       dosmnt n mtpt

       eject [ n ]

       Dossrv is a file server that interprets DOS file systems.  A single in‐
       stance  of  dossrv  can provide access to multiple DOS disks simultane‐

       Dossrv posts a file descriptor named service (default dos) in the  /srv
       directory.   To  access the DOS file system on a device, use mount with
       the spec argument (see bind(1)) the name of the file  holding  raw  DOS
       file  system,  typically  the disk.  If spec is undefined in the mount,
       dossrv will use file as the default name for the device holding the DOS

       Normally dossrv creates a pipe to act as the communications channel be‐
       tween itself and its clients.  The -s flag instructs dossrv to use  its
       standard input and output instead.  The kernels use this option if they
       are booting from a DOS disk.  This flag also prevents the  creation  of
       an explicit service file in /srv.

       The  -v  flag  causes  verbose  output for debugging, while the -r flag
       makes the file system read-only.

       The shell script a: contains

              unmount /n/a: >[2] /dev/null
              mount -c /srv/dos /n/a: /dev/fd0disk

       and is therefore a shorthand for mounting a floppy  disk  in  drive  A.
       The  scripts b: and dosmnt are similar, mounting the second floppy disk
       and the nth non-floppy DOS partition, respectively.   C:  and  d:  call
       dosmnt  in  an attempt to name the drives in the same order that Micro‐
       soft operating systems do.  9fat: provides access to the FAT  component
       of the Plan 9 partition (see prep(8)).

       The  file  attribute  flags  used by the DOS file system do not map di‐
       rectly to those used by Plan 9.  Since there is no concept of  user  or
       group,  permission changes via wstat (see stat(2)) will fail unless the
       same (read, write, execute) permissions are specified for user,  group,
       and  other.   For  example,  removing write permission in Plan 9 corre‐
       sponds to setting the read-only attribute in the DOS file system.  Most
       of the other DOS attributes are not accessible.

       Setting  the  exclusive use flag (DMEXCL) in Plan 9 corresponds to set‐
       ting the system use attribute in the DOS file system.  Such  files  are
       not  actually  restricted to exclusive use, but do merit special treat‐
       ment that helps in the creation of boot disks: when dossrv allocates  a
       new  block  for  such  a  file  (caused, say, by a write that fills the
       file's last allocated block), it succeeds only if it  can  arrange  for
       the file to be stored contiguously on disk.

       Since  other  operating  systems do not guarantee that system files are
       laid out contiguously, the DMAPPEND mode bit is set in file stat infor‐
       mation only when the file is currently contiguous.  Attempts to set the
       DMAPPEND mode bit explicitly will cause dossrv to try to make the  file
       contiguous, succeeding only if this is possible.

       9660srv  is  similar  to dossrv in specification, except that it inter‐
       prets ISO9660 CD-ROM file systems instead of DOS  file  systems.   Some
       CDs  contain multiple directory trees describing the same set of files.
       9660srv's first choice in such a case is a standard ISO9660  tree  with
       Plan  9  system use fields; the second choice is a Microsoft ``Joliet''
       tree, which allows long file names and Unicode  characters;  the  third
       choice  is  a standard ISO9660 or High Sierra tree.  The -9 flag causes
       9660srv to ignore the Plan 9 system  use  fields,  while  the  -J  flag
       causes  it  to  ignore the Joliet tree.  The -c option sets the size of
       the RAM cache to clusters clusters of 128KB.  The default  clusters  is
       16, but a value of 5600 will cache an entire CD incrementally.

       If  the  floppy  drive  has  an ejection motor, eject will spit out the
       floppy from drive n, default 0.

       Mount a floppy disk with a DOS file system on it.




       The overloading of the semantics of the DMEXCL and DMAPPEND bits can be