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:
Dec. 27, 2011
Filed:
Sep. 30, 2008
Per Brashers, Oakland, CA (US);
Sorin Faibish, Newton, MA (US);
Jason Glasgow, Newton, MA (US);
Xiaoye Jiang, Shrewsbury, MA (US);
Mario Wurzl, Westborough, MA (US);
Per Brashers, Oakland, CA (US);
Sorin Faibish, Newton, MA (US);
Jason Glasgow, Newton, MA (US);
Xiaoye Jiang, Shrewsbury, MA (US);
Mario Wurzl, Westborough, MA (US);
EMC Corporation, Hopkinton, MA (US);
Abstract
For enhanced access control, a client includes a token in each read or write command sent to a block storage device. The block storage device evaluates the token to determine whether or not read or write access is permitted at a specified logical block address. For example, the token is included in the logical block address field of a SCSI read or write command. The client may compute the token as a function of the logical block address of a data block to be accessed, or a metadata server may include the token in each block address of each extent reported to the client in response to a metadata request. For enhanced security, the token also is a function of a client identifier, a logical unit number, and access rights of the client to a particular extent of file system data blocks.