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SunOS 5.5 File Systems hsfs(7FS)

NAME hsfs − High Sierra & ISO 9660 CD-ROM ﬁlesystem

DESCRIPTION HSFS is a ﬁlesystem type that allows users access to ﬁles on High Sierra or ISO 9660 for-

mat CD-ROM disks from within the SunOS operating system. Once mounted, a HSFS

ﬁlesystem 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 orISO 9660CD-

ROM

, and applications can use standard UNIX system calls on these ﬁles and directories.

This ﬁlesystem also contains support for the Rock Ridge Extensions. If the extensions

are contained on theCD-ROM, then the ﬁlesystem will provide all of the ﬁlesystem

semantics and ﬁle types of UFS, except for writability and hard links.

HSFS ﬁlesystems are mounted either with the command:

mount −F hsfs −oro device-special directory-name

mount /hsfs

if a line similar to

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

is in your /etc/vfstab ﬁle (and /hsfs exists).

Normally, if Rock Ridge extensions exist on the CD-ROM, the ﬁlesystem will automati-

cally 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 −F hsfs −o ro,nrr device-special directory-name

Files on a HighSierra 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 char-

acters 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 highestversion

number is accessible.

Conversion of uppercase to lowercase characters may be disabled by using the −o noma-

plcase 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 underUFS. 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 throughHSFS have mode 555 (owner, group and world readable and exe-

cutable), 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 sup-

ported on a UFS ﬁlesystem; however, despite any write permissions, the ﬁle system is

read-only, with EROFS returned to any write operations.

modiﬁed 25 Apr 1994 7FS-125

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