International Business Machines Corporation

Robert R Berbec

Gary Stuart Puchkoff

James M Caffrey

William H Tetzlaff

Robert Baird

Jay H Unger

Gerald P Bozman

James J Myers

Alexander S Lett

Joseph A Williams

Roberto J Sanchez

John L Brady

Arthur P Fenaroli

Joanne T Crimi

Madeline R Whalen

Matthew C Iatridis

A method and apparatus for providing dynamically controlling access to files in a client/server system. A client wanting access to a file first requests a token from an object server. The object server generates the token as a function of the file name and ephemeral information and provides the token to both the client and the file system. Upon receiving the token from the object server, the client presents an access request to the file system, using the token rather than the file name as an identifier. The file system compares the received identifier with the file names in the specified directory as well as with a list of valid tokens that it maintains. If the identifier corresponds to a valid token for a file in the directory, the access request is granted. Otherwise, the access request is denied. The procedure is transparent to the client, which uses the token in the same manner as it would use a regular file name.

Dynamic server-managed access control for a distributed file system

A computer-implemented method for the name-oriented accessing of files having at least zero records, any access path to files and records through an external store coupling the computer being defined by a pair of related directories. A first directory of record entries is sorted on a two-part token. The token consists of a unique sequence number assigned to the record and the sequence number of any parent record entry. Each record entry includes the token, file or record name, and external store address or pointer A traverse through the tokens constitutes a leaf-searchable B-tree. Rapid access to target records is by way of a name-sorted, inverted directory of names and tokens as a subset and which is reconstitutable from the first directory in the event of unavailability.

Method for dynamically expanding and rapidly accessing file directories

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New York, NY, United States of America

Robert R Berbec