Emc Corporation

Yanbei Wang

Tao Sun

Chen Gong

Yingchao Zhou

Weigang Zhong

A technique for managing usage metrics of quota trees in a file system includes storing, in an inode table that lists inodes of the file system, identifiers (IDs) of quota trees to which the inodes belong. To check the usage of a quota tree, the inode table is scanned for any inodes that reference the quota tree ID of that quota tree. All such inodes are identified, and their usage attributes are summed to calculate an overall usage metric for the quota tree as a whole. The improved technique thus avoids the need to scan directory structures on disk.

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Shrewsbury, MA, United States of America

Yanbei Wang