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. 17, 2019
Filed:
Dec. 13, 2016
Apple Inc., Cupertino, CA (US);
Michael S. Mackovitch, Sunnyvale, CA (US);
Apple Inc., Cupertino, CA (US);
Abstract
The embodiments set forth techniques for generating snapshots of file system volumes without requiring the implementation of reference counts. A file system can manage snapshot identifiers (IDs) within an object map that corresponds to the file system volume, where each snapshot ID represents a different existing snapshot of the file system volume. A new snapshot can be generated simply by (1) establishing a new snapshot ID based on a current transaction ID managed for the file system volume, and (2) closing the current transaction ID and generating a new current transaction ID. In turn, the new current transaction ID is assigned as a transaction ID within mapping entries that are established/updated after the snapshot is established. In this manner, the transaction ID assigned to each mapping entry can be analyzed against the snapshot IDs to determine the snapshots (if any) to which the mapping entry corresponds.