hsfs(7FS) File Systems hsfs(7FS)NAMEhsfs - High Sierra & ISO 9660 CD-ROM file system
DESCRIPTION
HSFS is a file system type that allows users access to 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. That is, users can read
files 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 also contains support for the Rock Ridge Extensions.
If the extensions are contained on the CD-ROM, then the file system
will provide all of the file system semantics and file types of UFS,
except for writability and hard links.
If your /etc/vfstab file contains a line similar to
/dev/dsk/c0t6d0s0 −/hsfs hsfs-no ro
and /hsfs exists, you can mount an HSFS file system with either of the
following commands:
mount -Fhsfs-o ro device-special directory-name
or
mount /hsfs
Normally, if Rock Ridge extensions exist on the CD-ROM, the file sys‐
tem will automatically use those extensions. If you do not want to use
the Rock Ridge extensions, use the ``nrr'' (No Rock Ridge) mount
option. The mount command would then be:
mount -Fhsfs-o ro,nrr device-special directory-name
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 infor‐
mation. 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(1M). (See mount_hsfs(1M)).
If the CD-ROM contains Rock Ridge extensions, the file names and
directory names may contain any character supported under UFS. The
names may also be upper and/or lower case and will be 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, despite any
write permissions, the file system is read-only, with EROFS returned to
any write operations.
High Sierra and ISO 9660 CD-ROMs support only regular files and direc‐
tories, thus HSFS supports only these file types. A Rock Ridge CD-ROM
can support 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 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 ALSOmount(1M), mount_hsfs(1M), vfstab(4)
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(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.
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(1M) makes it optional to spec‐
ify the trailing dot. (See mount_hsfs(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.
SunOS 5.10 25 Apr 1994 hsfs(7FS)
