cdfs(4) [osf1 man page]
cdfs(4) Kernel Interfaces Manual cdfs(4) NAME
cdfs - The Compact Disk-Read Only Memory File System (CDFS) DESCRIPTION
The ISO 9660 standard describes volume and file structures for information exchange on a Compact Disk-Read Only Memory (CD-ROM) volume. 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 Interchange Level 2 with the exception of multiple volume semantics, which are supported. Refer to the international standard ISO 9660-1988 for additional information pertaining to the actual standard. The CDFS behaves the same as any read-only file system, and additionally supports the following semantics: The CDFS can be exported by NFS Users can mount other file system types (UFS, NFS, AdvFS) onto directories recorded on a CD-ROM volume CD-ROM volumes can be recorded in ISO 9660-1988, Interchange level 2, or (for backward compatibility) High Sierra Group (HSG) format The data on a CD-ROM volume that is recorded as part of a multiple volume set or consists of a single volume is made available when the volume is mounted File systems on a CD- ROM volume can be accessed locally and remotely The CDFS can be organized on a CD-ROM volume in multiple sessions. The contents of all sessions is available as one file system; individual sessions are not separately available. The CDFS 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, setgid, 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. The CDFS also supports the XCDR extensions (X/Open Preliminary Specification (1991) CD-ROM Support Component). These XCDR extensions add the following support: Users can examine selected ISO 9660 attributes through defined utilities and shared libraries A system administrator can substitute different file protections, owners, and file names for files on a CD-ROM volume. 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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hsfs(7FS) File Systems hsfs(7FS) NAME
hsfs - 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 operat- ing 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 sys- tem 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 -F hsfs -o ro device-special directory-name or mount /hsfs Normally, if Rock Ridge extensions exist on the CD-ROM, the file system 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 -F hsfs -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 information. 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 readable 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 permissions 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 directories, 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 ALSO
mount(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 handle all the files currently open. This problem may be overcome by adding a line of the form set hsfs:nhsnode=number to the /etc/system 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 equivalent 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 specify 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)