US 12,693,992 B2 · Usage correction in a file system

Abstract

A data management system may maintain a total-size counter for the file system. The total-size counter represents a sum of data size related to snapshots backed up to the file system. The data management system may perform data operation cycles to the file system. Each data operation cycle corresponds to a snapshot that includes files. Each data operation cycle may include incrementing the total-size counter by the data size of the files in the snapshot exchanged with the file system and adding, to a snapshot record, the amount of increment in incrementing the total-size counter as an increment-size counter. A data management system may perform a correction operation to correct the total-size counter. The correction operation may change the total-size counter by a difference between the total of the increment-size counters in the snapshot records and the total data size of file data exchanged with the file system.

Claims20

Dependent claims

A computer-implemented method for usage correction for a file system, the computer-implemented method comprising:

maintaining a file-system-level metadata for the file system, the file-system-level metadata representing an overall status in the file system;
performing a plurality of snapshot operations to the file system, wherein a particular snapshot operation has an interruption, the particular snapshot operation comprises:
incrementing the file-system-level metadata based on changes recorded the particular snapshot operation, and
recording a snapshot-level metadata that is specific to the particular snapshot operation, wherein the snapshot-level metadata includes an inaccuracy due to the interruption;
and
performing a correction operation that is asynchronous to the plurality of snapshot operations to correct the overall status in the file system by adjusting the file-system-level metadata, the correction operation is partially based on determining the inaccuracy of the snapshot-level metadata specific to the particular snapshot.

3 more elements

A system comprising:

a file system configured to store file data;
a metadata store comprising memory configured to store a file-system-level metadata for the file system, the file-system-level metadata representing an overall status in the file system;
and
a data management system in communication with the file system and the metadata store, the data management system comprising one or more processors and memory storing instructions, wherein the instructions, when executed by the one or more processors, cause the one or more processors to:
perform a plurality of snapshot operations to the file system, wherein a particular snapshot operation has an interruption, the particular snapshot operation comprises:
incrementing the file-system-level metadata based on changes recorded the particular snapshot operation, and
recording a snapshot-level metadata that is specific to the particular snapshot operation, wherein the snapshot-level metadata includes an inaccuracy due to the interruption;
and
perform a correction operation that is asynchronous to the plurality of snapshot operations to correct the overall status in the file system by adjusting the file-system-level metadata, the correction operation is partially based on determining the inaccuracy of the snapshot-level metadata specific to the particular snapshot.

6 more elements

Dependencies are inferred from the claim text.

Usage correction in a file system

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Usage correction in a file system

Life of this patent

Abstract

Claims20