cdfs(5cdfs)cdfs(5cdfs)Namecdfs - The CD-ROM (Compact Disc Read Only Memory) File System
The ISO 9660 standard describes volume and file structures for informa‐
tion exchange on CD-ROM's. CDFS supports mounting, as another local
file system type, CD-ROM's which 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 exeception of mul‐
tiple volume semantics, according to ISO 9660. Refer to the interna‐
tional standard ISO 9660-1988 for addtional information pertaining to
the actual standard.
The file system behaves the same as any read-only file system, and
additionally supports the following semantics. The can be exported 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 for non-interleaved files. Data contained in files recorded in
interleave mode and non-interleave mode is available through read(2).
If demand page execution of interleaved files is required, the user can
either copy the file to magnetic storage, or execute the file over NFS.
Since is a configurable kernel option, the following two lines must
exist in the systems configuration file:
If the system configuration does not contain the above lines, refer to
the Guide to Configuration File Maintenance for a detailed explaination
of how to modify the configuration file and rebuild a kernel.