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:
Aug. 20, 2013
Filed:
Jan. 11, 2012
Kumar Kanteti, Grafton, MA (US);
Yingchao Zhou, Tiantongyuan, CN;
Jun Guo, Beijing, CN;
Sitaram Pawar, Shrewsbury, MA (US);
Walter C. Forrester, Berkeley Heights, NJ (US);
Jia Zhai, Beijing, CN;
Kumar Kanteti, Grafton, MA (US);
Yingchao Zhou, Tiantongyuan, CN;
Jun Guo, Beijing, CN;
Sitaram Pawar, Shrewsbury, MA (US);
Walter C. Forrester, Berkeley Heights, NJ (US);
Jia Zhai, Beijing, CN;
EMC Corporation, Hopkinton, MA (US);
Abstract
For automatically committing a file of a file system to a WORM committed state when the file has not been modified for a certain period of time, a file server maintains a list of file identifiers and periodically scans the list to check whether or not the certain period of time has expired for each file on the list. If so, the file is committed to the WORM state. The file server also enforces an in-place lock in response to a client request to modify or delete a file when the certain period of time is found to have expired for the file. A minimum modify time and a maximum modified time are included in each entry of the list of file identifiers in order to skip entries and to reclaim memory of entries during the periodic scan.