Method, system and computer program product for implementing copy-on-write of a file
US7085909B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 29, 2003 |
| Grant date | Aug 1, 2006 |
| Priority date | — |
| Expiry date | Oct 1, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F12/10
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Various copy-on-write implementations for a computing environment are presented. One copy-on-write implementation includes employing a read mapping table to perform a first virtual block to physical block mapping for use in reading a block of data of a file to be copy-on-written from physical storage for modification; and employing a different, write mapping table to perform a second virtual block to physical block mapping for use in writing a modified block of the file data to physical storage, wherein copy-on-write of the block of data is achieved using a single write operation. In another implementation, a distributed copy-on-write of a file for a client server environment is presented. This distributed copy-on-write includes performing, by a first client, copy-on-write of at least one block of data of the file to be copy-on-written, and performing, by a second client, copy-on-write of at least one other block of data of the file, wherein multiple clients perform the copy-on-write of the file.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.