Tracking and recovering a disk allocation state
US11003555B2 · kind B2 · utility
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20Claims
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Key dates
| Filing date | Dec 16, 2017 |
| Grant date | May 11, 2021 |
| Priority date | — |
| Expiry date | Jul 11, 2039 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F2201/84
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
The subject matter described herein is generally directed towards tracking and recovering a disk allocation state. An on-disk log of operations is maintained to describe operations performed to an in-memory partial reference count map. Upon a crash of a host computing device during a checkpoint operation to an on-disk complete reference count map, the on-disk log of operations is used to undo and then redo the operations, or just redo the operations. In this manner, a disk allocation state prior to the crash is recreated in the on-disk complete reference count map with atomicity and crash consistency.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.