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hsfs(4fs)

hsfs(4FS)                        File Systems                        hsfs(4FS)



NAME
       hsfs - High Sierra & ISO 9660 CD-ROM file system

DESCRIPTION
       HSFS  is  a  file system type that allows users to access files on High
       Sierra or ISO 9660 format CD-ROM disks from within the  Oracle  Solaris
       operating  system.  Once  mounted, a HSFS file system provides standard
       Oracle Solaris read-only file system operations and semantics,  meaning
       that you can read and list files in a directory on a High Sierra or ISO
       9660 CD-ROM and applications can use  standard  UNIX  system  calls  on
       these files and directories.


       This  file  system  contains support for Rock Ridge, ISO 9660 Version 2
       and Joliet extensions. These extensions provide support for file  names
       with  a  length  of  at least 207 bytes, but only Rock Ridge extensions
       (with the exception of writability and hard  links)  can  provide  file
       system  semantics and file types as they are found in UFS. The presence
       of Rock Ridge, ISO 9660 Version 2 and Joliet is  autodetected  and  the
       best-suitable  available  extension is used by the HSFS driver for file
       name and attribute lookup.


       If your /etc/vfstab file contains a line similar to the following:

         /dev/dsk/c0t6d0s0 −/hsfs hsfs -no ro



       and /hsfs exists, you can mount an HSFS file system with either of  the
       following commands:

         mount -F hsfs -o ro device-special directory-name





       or

         mount /hsfs



       By  default, Rock Ridge extensions are used if available, otherwise ISO
       9660 Version 2, then Joliet are used. If neither extension  is  present
       HSFS defaults to the standard capabilities of ISO 9660. Since so-called
       hybrid CD-ROMs that contain multiple extensions are possible,  you  can
       use  the following mount options to deliberately disable the search for
       a specific extension or to force the use of a specific  extension  even
       if a preferable type is present:

         mount -F hsfs -o ro,nrr device-special directory-name



       Mount options are:


       rr—request  HSFS  to use Rock Ridge extensions, if present. This is the
       default behavior and does not need to be explicitly specified.


       nrr—disable detection  and  use  of  Rock  Ridge  extensions,  even  if
       present.


       vers2—request  HSFS  to use ISO 9660 Version 2 extensions, even if Rock
       Ridge is available.


       novers2—disable detection and use of ISO 9660 Version 2 extensions.


       joliet—request HSFS to use Joliet extensions, even if Rock Ridge or ISO
       9660 Version 2 extensions are available.


       nojoliet—disable detection and use of Joliet extensions.


       Files  on  a High Sierra or ISO 9660 CD-ROM disk have names of the form
       filename.ext;version, where filename and the optional ext consist of  a
       sequence  of  uppercase  alphanumeric characters (including '_'), while
       the version consists of a sequence of digits, representing the  version
       number  of  the  file.  HSFS converts all the uppercase characters in a
       file name to lowercase, and truncates the ';' and version  information.
       If  more  than one version of a file is present on the CD-ROM, only the
       file with the highest version number is accessible.


       Conversion of uppercase to lowercase  characters  may  be  disabled  by
       using the -o  nomaplcase option to mount(8). (See mount_hsfs(8)).


       If  the CD-ROM contains Rock Ridge, ISO 9660 version 2 or Joliet exten‐
       sions, the file names and directory names  may  contain  any  character
       supported  under  UFS. The names may also be uppercase and/or lowercase
       and are case sensitive. File name lengths can be as long  as  those  of
       UFS.


       Files accessed through HSFS have mode 555 (owner, group and world read‐
       able and executable), uid 0 and gid 3. If a directory on the CD-ROM has
       read  permission,  HSFS  grants  execute  permission  to the directory,
       allowing it to be searched.


       With Rock Ridge extensions, files and directories can have any  permis‐
       sions that are supported on a UFS file system. However, under all write
       permissions, the file system is read-only, with EROFS returned  to  any
       write operations.


       Like High Sierra and ISO 9660 CD-ROMs, HSFS supports only regular files
       and directories. A Rock Ridge CD-ROM can support regular files,  direc‐
       tories,  and  symbolic  links,  as well as device nodes, such as block,
       character, and FIFO.

EXAMPLES
       Example 1 Sample Display of File System Files



       If there is a file BIG.BAR on a High Sierra or ISO 9660  format  CD-ROM
       it will show up as big.bar when listed on a HSFS file system.



       If there are three files


         BAR.BAZ;1



         BAR.BAZ;2




       and


         BAR.BAZ;3




       on  a  High  Sierra  or ISO 9660 format CD-ROM, only the file BAR.BAZ;3
       will be accessible. It will be listed as bar.baz.

SEE ALSO
       vfstab(5), mount(8), mount_hsfs(8), zonecfg(8)


       N. V. Phillips and Sony Corporation, System  Description  Compact  Disc
       Digital Audio, ("Red Book").


       N. V. Phillips and Sony Corporation, System Description of Compact Disc
       Read Only Memory, ("Yellow Book").


       IR "Volume and File Structure of CD-ROM for  Information  Interchange",
       ISO 9660:1988(E).

DIAGNOSTICS
       hsfs: Warning: the file system...
       does not conform to the ISO-9660 spec

           The  specific  reason  appears  on the following line. You might be
           attempting to mount a CD-ROM containing a  different  file  system,
           such as UFS.



       hsfs: Warning: the file system...
       contains a file [with an] unsupported type

           The  hsfs  file  system does not support the format of some file or
           directory on the CD-ROM, for example a record structured file.



       hsfs: hsnode table full, %d nodes allocated

           There are not enough HSFS internal data structure elements to  han‐
           dle  all  the files currently open. This problem may be overcome by
           adding a line of the form set hsfs:nhsnode=number to the  /etc/sys‐
           tem system configuration file and rebooting. See system(5).


WARNINGS
       Do not physically eject a CD-ROM while the device is still mounted as a
       HSFS file system.


       Under MS-DOS (for which CD-ROMs are frequently targeted), files with no
       extension may be represented either as:

         filename.



       or

         filename



       that is, with or without a trailing period. These names are not equiva‐
       lent under UNIX systems. For example, the names:

         BAR.



       and

         BAR



       are not names for the same file under the UNIX system. This  may  cause
       confusion  if  you  are consulting documentation for CD-ROMs originally
       intended for MS-DOS systems.


       Use of the -o  notraildot option to mount(8) makes it optional to spec‐
       ify the trailing dot. (See mount_hsfs(8)).

NOTES
       No  translation  of  any sort is done on the contents of High Sierra or
       ISO 9660 format CD-ROMs; only directory and file names are  subject  to
       interpretation by HSFS.


       By default, zones can mount this file system.



Oracle Solaris 11.4               11 May 2021                        hsfs(4FS)
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