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:
Nov. 06, 2012
Filed:
Aug. 26, 2010
Janet E. Adkins, Austin, TX (US);
Joon Chang, Austin, TX (US);
Robert K. Gjertsen, Austin, TX (US);
Ninad S. Palsule, Beaverton, OR (US);
Janet E. Adkins, Austin, TX (US);
Joon Chang, Austin, TX (US);
Robert K. Gjertsen, Austin, TX (US);
Ninad S. Palsule, Beaverton, OR (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
A client node on which a file system is mounted can be configured to efficiently handle content access requests after a snapshot is created. The client node can maintain generation numbers at a data block, a file, and a fileset level to determine whether a data block is part of a snapshot generation and consequently whether the data block is writable in a current generation. Data block mappings and write access permissions associated with the data blocks need not be revoked at the client node prior to creating the snapshot. Cached data block mappings can be accessed to identify data blocks for servicing a read request. The data block can be updated in place if the data block is not part of the snapshot generation. The write request can be serviced at a new data block if the data block is part of the snapshot generation.