linux/Documentation/filesystems/hfs.rst
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   1.. SPDX-License-Identifier: GPL-2.0
   2
   3==================================
   4Macintosh HFS Filesystem for Linux
   5==================================
   6
   7
   8.. Note:: This filesystem doesn't have a maintainer.
   9
  10
  11HFS stands for ``Hierarchical File System`` and is the filesystem used
  12by the Mac Plus and all later Macintosh models.  Earlier Macintosh
  13models used MFS (``Macintosh File System``), which is not supported,
  14MacOS 8.1 and newer support a filesystem called HFS+ that's similar to
  15HFS but is extended in various areas.  Use the hfsplus filesystem driver
  16to access such filesystems from Linux.
  17
  18
  19Mount options
  20=============
  21
  22When mounting an HFS filesystem, the following options are accepted:
  23
  24  creator=cccc, type=cccc
  25        Specifies the creator/type values as shown by the MacOS finder
  26        used for creating new files.  Default values: '????'.
  27
  28  uid=n, gid=n
  29        Specifies the user/group that owns all files on the filesystems.
  30        Default:  user/group id of the mounting process.
  31
  32  dir_umask=n, file_umask=n, umask=n
  33        Specifies the umask used for all files , all directories or all
  34        files and directories.  Defaults to the umask of the mounting process.
  35
  36  session=n
  37        Select the CDROM session to mount as HFS filesystem.  Defaults to
  38        leaving that decision to the CDROM driver.  This option will fail
  39        with anything but a CDROM as underlying devices.
  40
  41  part=n
  42        Select partition number n from the devices.  Does only makes
  43        sense for CDROMS because they can't be partitioned under Linux.
  44        For disk devices the generic partition parsing code does this
  45        for us.  Defaults to not parsing the partition table at all.
  46
  47  quiet
  48        Ignore invalid mount options instead of complaining.
  49
  50
  51Writing to HFS Filesystems
  52==========================
  53
  54HFS is not a UNIX filesystem, thus it does not have the usual features you'd
  55expect:
  56
  57 * You can't modify the set-uid, set-gid, sticky or executable bits or the uid
  58   and gid of files.
  59 * You can't create hard- or symlinks, device files, sockets or FIFOs.
  60
  61HFS does on the other have the concepts of multiple forks per file.  These
  62non-standard forks are represented as hidden additional files in the normal
  63filesystems namespace which is kind of a cludge and makes the semantics for
  64the a little strange:
  65
  66 * You can't create, delete or rename resource forks of files or the
  67   Finder's metadata.
  68 * They are however created (with default values), deleted and renamed
  69   along with the corresponding data fork or directory.
  70 * Copying files to a different filesystem will loose those attributes
  71   that are essential for MacOS to work.
  72
  73
  74Creating HFS filesystems
  75========================
  76
  77The hfsutils package from Robert Leslie contains a program called
  78hformat that can be used to create HFS filesystem. See
  79<https://www.mars.org/home/rob/proj/hfs/> for details.
  80
  81
  82Credits
  83=======
  84
  85The HFS drivers was written by Paul H. Hargrovea (hargrove@sccm.Stanford.EDU).
  86Roman Zippel (roman@ardistech.com) rewrote large parts of the code and brought
  87in btree routines derived from Brad Boyer's hfsplus driver.
  88