linux/Documentation/filesystems/adfs.txt
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   1Mount options for ADFS
   2----------------------
   3
   4  uid=nnn       All files in the partition will be owned by
   5                user id nnn.  Default 0 (root).
   6  gid=nnn       All files in the partition will be in group
   7                nnn.  Default 0 (root).
   8  ownmask=nnn   The permission mask for ADFS 'owner' permissions
   9                will be nnn.  Default 0700.
  10  othmask=nnn   The permission mask for ADFS 'other' permissions
  11                will be nnn.  Default 0077.
  12  ftsuffix=n    When ftsuffix=0, no file type suffix will be applied.
  13                When ftsuffix=1, a hexadecimal suffix corresponding to
  14                the RISC OS file type will be added.  Default 0.
  15
  16Mapping of ADFS permissions to Linux permissions
  17------------------------------------------------
  18
  19  ADFS permissions consist of the following:
  20
  21        Owner read
  22        Owner write
  23        Other read
  24        Other write
  25
  26  (In older versions, an 'execute' permission did exist, but this
  27   does not hold the same meaning as the Linux 'execute' permission
  28   and is now obsolete).
  29
  30  The mapping is performed as follows:
  31
  32        Owner read                              -> -r--r--r--
  33        Owner write                             -> --w--w---w
  34        Owner read and filetype UnixExec        -> ---x--x--x
  35    These are then masked by ownmask, eg 700    -> -rwx------
  36        Possible owner mode permissions         -> -rwx------
  37
  38        Other read                              -> -r--r--r--
  39        Other write                             -> --w--w--w-
  40        Other read and filetype UnixExec        -> ---x--x--x
  41    These are then masked by othmask, eg 077    -> ----rwxrwx
  42        Possible other mode permissions         -> ----rwxrwx
  43
  44  Hence, with the default masks, if a file is owner read/write, and
  45  not a UnixExec filetype, then the permissions will be:
  46
  47                        -rw-------
  48
  49  However, if the masks were ownmask=0770,othmask=0007, then this would
  50  be modified to:
  51                        -rw-rw----
  52
  53  There is no restriction on what you can do with these masks.  You may
  54  wish that either read bits give read access to the file for all, but
  55  keep the default write protection (ownmask=0755,othmask=0577):
  56
  57                        -rw-r--r--
  58
  59  You can therefore tailor the permission translation to whatever you
  60  desire the permissions should be under Linux.
  61
  62RISC OS file type suffix
  63------------------------
  64
  65  RISC OS file types are stored in bits 19..8 of the file load address.
  66
  67  To enable non-RISC OS systems to be used to store files without losing
  68  file type information, a file naming convention was devised (initially
  69  for use with NFS) such that a hexadecimal suffix of the form ,xyz
  70  denoted the file type: e.g. BasicFile,ffb is a BASIC (0xffb) file.  This
  71  naming convention is now also used by RISC OS emulators such as RPCEmu.
  72
  73  Mounting an ADFS disc with option ftsuffix=1 will cause appropriate file
  74  type suffixes to be appended to file names read from a directory.  If the
  75  ftsuffix option is zero or omitted, no file type suffixes will be added.
  76
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