Preserving past states of file system nodes
US9031911B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 5, 2012 |
| Grant date | May 12, 2015 |
| Priority date | — |
| Expiry date | Jul 12, 2033 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F16/9017
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
For preserving past states of file system nodes, selective tuple versioning on a file system table is used by adding a bitmap to a row for a node within a file system table for preserving the past state of the node in a file system. A request is received for updating the node along with a node identification and associated attributes of the node needing to be updated. A second time value indicating the time of the updating is generated. The row for the node is duplicated into a new row in the file system table with an end time set equal to the second time value if the bit in the bitmap for the node is set. The row associated with the node is updated according to the update request.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.