cdnode(4)                                                         cdnode(4)




 NAME    [Toc]    [Back]
      cdnode - format of a CDFS cdnode

 SYNOPSIS    [Toc]    [Back]
      #include <sys/types.h>
      #include <sys/cdnode.h>

 DESCRIPTION    [Toc]    [Back]
      This entry describes the cdnode structure and related concepts for the
      CDFS file system.

      The CDFS file system does not have the concept of a separate entity
      called an inode.  The information normally found in an HFS inode is
      kept in a cdnode data structure.  However, the cdnode data structure
      does not reside on the physical media, but instead is kept in kernel
      memory space only.  The cdnode information is used to uniquely
      identify a file.

      The information kept in the cdnode structure is obtained from two
      other data structures in the CDFS file system:

           1.   Directory record for the file or directory, and

           2.   Extended attribute record (XAR) for the file or directory,
                if one exists.

      Because few files usually have XARs associated with them, the cdnode
      information most often consists only of attributes given by the
      directory record for the file.

      Since cdnodes are kept in kernel memory, they cannot be directly
      accessed by the user.  The stat() system call attempts to map whatever
      information is included in the cdnode for a given file into the
      standard stat structure (see stat(2)).  However, since a cdnode
      includes information that does not have corresponding fields in the
      stat structure, that information cannot be mapped and therefore cannot
      be accessed.  No method is provided to access an entire cdnode
      structure.

 FILES    [Toc]    [Back]
      /usr/include/sys/cdnode.h
      /usr/include/sys/cdfsdir.h

 SEE ALSO    [Toc]    [Back]
      stat(2), cdrom(4), cdfsdir(4).


 Hewlett-Packard Company            - 1 -   HP-UX 11i Version 2: August 2003