The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 17, 2006
Filed:
Apr. 29, 2003
D. Scott Guthridge, Portland, OR (US);
Rajagopal Ananthanarayanan, Milpitas, CA (US);
Ralph A. Becker-szendy, Los Gatos, CA (US);
Robert M. Rees, Los Gatos, CA (US);
D. Scott Guthridge, Portland, OR (US);
Rajagopal Ananthanarayanan, Milpitas, CA (US);
Ralph A. Becker-Szendy, Los Gatos, CA (US);
Robert M. Rees, Los Gatos, CA (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
A method and system for asserting a lock in a distributed file system is provided. All distributed locks have a lease for a limited time period, wherein the lease may be renewed periodically. A lock manager data structure is provided to maintain mode compatibility of locks granted to different client nodes for the same object. The process of acquiring or reasserting a lock includes determining whether there are other valid locks in use, as well as whether a valid lock is in operation in a conflicting or compatible mode with a requested lock. A new lock lease may be granted and a lock lease which has expired may be reasserted if a conflicting lease is not present.