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diff --git a/Documentation/filesystems/hfs.rst b/Documentation/filesystems/hfs.rst new file mode 100644 index 000000000000..ab17a005e9b1 --- /dev/null +++ b/Documentation/filesystems/hfs.rst @@ -0,0 +1,87 @@ +.. SPDX-License-Identifier: GPL-2.0 + +================================== +Macintosh HFS Filesystem for Linux +================================== + + +.. Note:: This filesystem doesn't have a maintainer. + + +HFS stands for ``Hierarchical File System`` and is the filesystem used +by the Mac Plus and all later Macintosh models. Earlier Macintosh +models used MFS (``Macintosh File System``), which is not supported, +MacOS 8.1 and newer support a filesystem called HFS+ that's similar to +HFS but is extended in various areas. Use the hfsplus filesystem driver +to access such filesystems from Linux. + + +Mount options +============= + +When mounting an HFS filesystem, the following options are accepted: + + creator=cccc, type=cccc + Specifies the creator/type values as shown by the MacOS finder + used for creating new files. Default values: '????'. + + uid=n, gid=n + Specifies the user/group that owns all files on the filesystems. + Default: user/group id of the mounting process. + + dir_umask=n, file_umask=n, umask=n + Specifies the umask used for all files , all directories or all + files and directories. Defaults to the umask of the mounting process. + + session=n + Select the CDROM session to mount as HFS filesystem. Defaults to + leaving that decision to the CDROM driver. This option will fail + with anything but a CDROM as underlying devices. + + part=n + Select partition number n from the devices. Does only makes + sense for CDROMS because they can't be partitioned under Linux. + For disk devices the generic partition parsing code does this + for us. Defaults to not parsing the partition table at all. + + quiet + Ignore invalid mount options instead of complaining. + + +Writing to HFS Filesystems +========================== + +HFS is not a UNIX filesystem, thus it does not have the usual features you'd +expect: + + * You can't modify the set-uid, set-gid, sticky or executable bits or the uid + and gid of files. + * You can't create hard- or symlinks, device files, sockets or FIFOs. + +HFS does on the other have the concepts of multiple forks per file. These +non-standard forks are represented as hidden additional files in the normal +filesystems namespace which is kind of a cludge and makes the semantics for +the a little strange: + + * You can't create, delete or rename resource forks of files or the + Finder's metadata. + * They are however created (with default values), deleted and renamed + along with the corresponding data fork or directory. + * Copying files to a different filesystem will loose those attributes + that are essential for MacOS to work. + + +Creating HFS filesystems +======================== + +The hfsutils package from Robert Leslie contains a program called +hformat that can be used to create HFS filesystem. See +<http://www.mars.org/home/rob/proj/hfs/> for details. + + +Credits +======= + +The HFS drivers was written by Paul H. Hargrovea (hargrove@sccm.Stanford.EDU). +Roman Zippel (roman@ardistech.com) rewrote large parts of the code and brought +in btree routines derived from Brad Boyer's hfsplus driver. |