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0 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)

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