Extended file system
| Full name | Extended file system |
|---|---|
| Introduced | April 1992 with Linux |
| Structures | |
| Directory contents | Table |
| File allocation | bitmap (free space), table (metadata) |
| Bad blocks | Table |
| Features | |
| File system permissions | POSIX |
| Transparent encryption | No |
The extended file system, or ext, was implemented in April 1992 as the first file system created specifically for the Linux kernel. It was the first files system to use the virtual file system (VFS), for which support was added in the Linux kernel in version 0.96c, and it could handle file systems up to 2 gigabytes (GB) in size.[1] Its metadata structure was inspired by the traditional Unix file system.
ext was the first in the series of extended file systems. In 1993, it was superseded by both ext2 and xiafs. These competed for a time, but ext2 won because of its long-term viability: ext2 remedied issues with ext, such as the immutability of inodes and fragmentation.[2]
Other extended file systems
There are other members in the extended file system family:
- ext2, the second extended file system
- ext3, the third extended file system.
- ext4, the fourth extended file system.
See also
References
- ^ Jones, M. Tim (February 17, 2009). "Anatomy of ext4". IBM Developer Works. Retrieved 2012-02-08.
- ^ Card, Rémy; Ts'o, Theodore; Tweedie, Stephen. "Design and Implementation of the Second Extended Filesystem". Archived from the original on 2012-02-04. Retrieved 2012-02-08. First published in First Dutch International Symposium on Linux. State University of Groningen. 1995. ISBN 90-367-0385-9.
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