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:
Feb. 16, 2021
Filed:
Jun. 29, 2015
Emc Corporation, Hopkinton, MA (US);
Marc De Souter, Wayne, NJ (US);
Pranit Sethi, Piscataway, NJ (US);
EMC IP Holding Company LLC, Hopkinton, MA (US);
Abstract
Logging changes to file system metadata using a single log hold per cached block of metadata. A metadata log including log entries is maintained in persistent storage, and each log entry in the metadata log contains metadata modified by a corresponding file system request. A single log hold is stored for each block of cached metadata. The single log hold for a given block of cached metadata indicates a file system request that modifies the metadata contained in the block, and that corresponds to a log entry located the closest, of all log entries corresponding to file system requests that modify metadata contained in the block, to a head of the metadata log.