Ditto address indicating true disk address for actual data blocks stored in one of an inode of the file system and subsequent snapshot
US7043503B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 15, 2002 |
| Grant date | May 9, 2006 |
| Priority date | — |
| Expiry date | May 4, 2023 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S707/99931
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A system, method and computer readable medium for providing a file system snapshot with ditto address feature is disclosed. The method includes generating a file system snapshot wherein the snapshot is substantially empty. When metadata associated with a source file included in the snapshot is modified, the inode corresponding to the source file is copied to a shadow inode in the snapshot. When information is appended to a data block associated with a source file included in the snapshot, the inode corresponding to the source file is also copied to a shadow inode in the snapshot. When information in a data block associated with a source file included in the snapshot is overwritten or deleted, the inode corresponding to the source file is copied to a shadow inode in the snapshot and the original data block corresponding to the source file is copied to the snapshot.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.