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:
Jun. 01, 2010
Filed:
Dec. 18, 2000
John H. Howard, Cambridge, MA (US);
John H. Howard, Cambridge, MA (US);
Oracle America, Inc., Redwood Shores, CA (US);
Abstract
An object-based storage may employ a transactional interface and a copy on write protocol. The inode for the file (which is identified by the I-number and indicates one or more blocks storing the file data) may be copied to a working copy of the inode, and the working copy may be updated to indicate the newly allocated blocks. In response to a file commit (e.g. a file close or a file synchronization command), the working copy of the inode may be atomically written to a non-volatile storage. In this manner, the updates performed during the transaction may be atomically committed to the file. The inode itself may be stored in a file (referred to as the inode file), and the storage may perform updates to the inode file atomically as well. The inode file may be modified using the copy on write protocol described above, and the master inode (mapping the blocks of the inode file) may be atomically written to non-volatile storage to atomically update the inode file. In one particular embodiment, the storage employs a journal technique for updates to the inode file.