filesystems(4)                                                  filesystems(4)



NAME
     filesystems: cdfs, dos, fat, EFS, hfs, mac, iso9660, cd-rom, kfs, nfs,
     XFS, rockridge - IRIX filesystem types

DESCRIPTION
     IRIX supports a number of different filesystems.  Some of these types are
     names that can be used with the mount(1) command's -t option.  Others are
     just common names and cannot be used with the mount command.  An example
     of this is the RockRidge type, which is a superset of the iso9660
     filesystem type.  Therefore RockRidge filesystems are mounted with a
     command similar to this:

          mount -t iso9660 -o ro /dev/rdsk/dks0d3vol /CDROM

     The following filesystem types are supported:

     bds         Not a file system type, an extension to NFS for bulk data
                 transfers.  The BDSpro server is an optional product and must
                 be purchased separately.

     cdfs (CD-ROM)
                 Same as type iso9660 (see below); this is the ABI compliant
                 name.

     dos (fat)   The filesystem used by many personal computers.  Types 1, 4,
                 and 6 are supported, included long names where supported.
                 Type 5 (extended partitions) are supported only if mounted
                 with the partition # options.  IRIX support for dos
                 filesystems is restricted to removable disk devices such as
                 floppy and floptical disks.  Filenames on dos filesystems are
                 restricted to up to an eight character name followed by an
                 optional period and three character filename extension, for
                 most types.  Longer names are supported to a limited degree,
                 on the types where the native OS supports them.

     EFS         The older extent-based disk filesystem used by IRIX for disks
                 and also for IRIX software distribution CD-ROMs.  See efs(4)
                 for more details.

     fd          A filesystem used to access process file descriptors.

     hfs (mac)   The filesystem used by Macintosh computers.  IRIX support for
                 hfs filesystems is restricted to removable disk devices such
                 as floppy and floptical disks and to CD-ROMs.  A hfs file is
                 composed of three portions:  a data fork, a resource fork,
                 and a desktop information entry.  The data fork appears in a
                 normal directory.  The resource fork in a special directory
                 (.HSResource) in the file's directory.  The desktop
                 information for all files in a directory is contained in the
                 special file .HSancillary.





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filesystems(4)                                                  filesystems(4)



     iso9660 (CD-ROM)
                 A CD-ROM filesystem type conforming to ISO standard 9660.
                 iso9660 CD-ROMs are used when the contents of the CD-ROM is
                 intended to be readable by a variety of operating systems.
                 You must install the optional subsystem eoe.sw.cdrom to be
                 able to mount and read an iso9660 CD-ROM.  Also see RockRidge
                 below.  Note that IRIX software distribution CD-ROMs are not
                 iso9660 filesystems, they are efs filesystems.  Music CDs are
                 not file structured and are not used as filesystems.  Music
                 CDs can be played using the CD-ROM drive using cdman(1) or
                 cdplayer(1).

     kfs         A network filesystem used to access disks on located on
                 remote computers using AppleShare networking.  Generally,
                 AppleShare networking is used to access Macintosh computers.
                 Except for the disk location, kfs filesystems are identical
                 to hfs filesystems.

     nfs         A network filesystem used to access disks located on remote
                 computers.  Both NFS Version 2, and NFS Version 3 are
                 supported.  NFS is an optional product and must be purchased
                 separately.  The subsystem nfs.sw.nfs must be installed to
                 use NFS.

     proc        A filesystem that provides access to the image of each active
                 process in the system.

     hwgfs       A filesystem that provides access to the system hardware
                 configuration.

     RockRidge   A filesystem layered on type of the iso9660 filesystem type
                 (see above) that provides semantics closer to those of
                 standard UNIX filesystems.  In particular, it supplies file
                 permissions and allows for directory hierarchies more than 8
                 levels deep.

     XFS         The next-generation 64-bit high performance journaling
                 filesystem used by IRIX for disks.  See xfs(4) for more
                 details.

     cachefs     A caching filesystem for use with efs, xfs, nfs, nfs3,
                 iso9660, hfs, dos, kfs, and cdfs.  See cachefs(4) for
                 details.

NOTE
     The nfs and kfs filesystems are optional products.  Support for iso9660
     filesystems is in the optional subsystem eoe.sw.cdrom.

     IRIX implements dos, hfs, iso9660, and kfs filesystems as user mode NFS
     daemons.  In some cases errors detected by these daemons are reported as
     NFS errors.  Although NFS is a product option, support for these
     filesystem types is not dependent on the installation of NFS.



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filesystems(4)                                                  filesystems(4)



SEE ALSO
     exportfs(1M), fpck(1M), fsck(1M), mediad(1M), mkfp(1M), mkfs(1M),
     mount(1M), mount_kfs(1M), efs(4), fd(4), fstab(4), hwgfs(4), proc(4),
     xfs(4).



















































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