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Command: cdfs | Section: 4 | Source: Digital UNIX | File: cdfs.4.gz
cdfs(4) Kernel Interfaces Manual cdfs(4)
NAME
cdfs - The CD-ROM (Compact Disc Read Only Memory) File System
DESCRIPTION
The ISO 9660 standard describes volume and file structures for informa-
tion exchange on CD-ROMs. CDFS supports mounting, as another local file
system type, CD-ROMs that comply to the standard. Once mounted, files
and directories recorded on the CD-ROM become accessible in a read-only
manner through system calls and commands. Support of the standard is
limited to level 2 interchange with the exception of multiple volume
semantics, according to ISO 9660. Refer to the international standard
ISO 9660-1988 for additional information pertaining to the actual stan-
dard.
The CDFS file system behaves the same as any read-only file system, and
additionally supports the following semantics. The CDFS can be ex-
ported by NFS, and supports users being able to mount other file system
types (UFS, NFS, CDFS) onto directories recorded on the CDFS volume.
Volumes recorded in ISO 9660-1988 (interchange level 2) or High Sierra
Group (HSG) format are supported. The data of a mounted volume which is
recorded as part of a multiple volume set or consists of a single vol-
ume set is made available. Both local and remote execution is sup-
ported.
The CDFS file system also supports CD-ROMs recorded using the Rock
Ridge Interchange Protocol, Revision 1.09, August 1991. Rock Ridge
specifies the use of the extension fields that are defined by
ISO-9660:1988, and it uses those extensions to provide the following
information: File owner, file group, file permissions Additional file
types (symbolic links, device special files, named pipes) setuid, set-
gid, and sticky bits Hard link counts POSIX file names (mixed case
names, unstructured names, and longer names than ISO-9660:1988 allows)
Deep directory hierarchies (greater than 8 levels) File time stamps
Refer to the Rock Ridge specification for additional information about
the extensions.
RELATED INFORMATION
mount(8), cddevsuppl(8), cdsuf(1), cd_getdevmap(3), cd_setdevmap(3),
and cd_suf(3) delim off
cdfs(4)