File Systems hsfs(7FS)
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 SunOS operating system. Once mounted, a HSFS file system
provides standard SunOS 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 applica-
tions 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 writa-
bility 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 nei-
ther 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
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File Systems hsfs(7FS)
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 expli-
citly 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 charac-
ters 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 dis-
abled by using the -o nomaplcase option to mount(1M). (See
mounthsfs(1M)).
If the CD-ROM contains Rock Ridge, ISO 9660 version 2 or
Joliet extensions, the file names and directory names may
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File Systems hsfs(7FS)
contain any character supported under UFS. The names may
also be upper and/or lower case 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 readable 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 permissions 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 sup-
port regular files, directories, 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 for-
mat 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.
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File Systems hsfs(7FS)
SEE ALSO
mount(1M), mounthsfs(1M), vfstab(4)
N. V. Phillips and Sony Corporation, System Description Com-
pact 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 dif-
ferent 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 ele-
ments to handle all the files currently open. This
problem may be overcome by adding a line of the form set
hsfs:nhsnode=number to the /etc/system system configura-
tion file and rebooting. See system(4).
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.
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File Systems hsfs(7FS)
or
filename
that is, with or without a trailing period. These names are
not equivalent 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(1M) makes it
optional to specify the trailing dot. (See mounthsfs(1M)).
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.
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