Accession Number : ADA134916

Title :   An Extensible File System for HYDRA,

Corporate Author : CARNEGIE-MELLON UNIV PITTSBURGH PA DEPT OF COMPUTER SCIENCE

Personal Author(s) : Almes,G ; Robertson,G

PDF Url : ADA134916

Report Date : 09 Feb 1978

Pagination or Media Count : 16

Abstract : An extensible file system has been designed and implemented for Hydra, an advanced capability-based operating system. This system demonstrates three notable advances to subsystem design: It provides a protected and efficient implementation via user-level code of functions ordinarily implemented as part of a conventional system's monolithic privileged section; It provides practical solutions to two protection problems, the Modification Problem and the Confinement Problem, for users of the file system; and It provides separation of mechanisms for data representation from mechanisms for protection and synchronization, thus allowing an extensible family of subfile systems to evolve. This paper treats the design and implementation of the Hydra File System and reflects on its implications for subsystem design and implementation. (Author)

Descriptors :   *Data processing security, *Computer files, *Data management, *Systems engineering, Protection, Confinement(General), Modification, Separation, Data processing, Files(Records), Experimental design

Subject Categories : Administration and Management
      Computer Programming and Software

Distribution Statement : APPROVED FOR PUBLIC RELEASE