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The extended file system, or ext, was implemented in April 1992 as the first file system created specifically for the Linux kernel. Although ext is not a specific file system name, it has been succeeded by ext2, ext3, and ext4. It has metadata structure inspired by traditional Unix filesystem principles, and was designed by Rémy Card to overcome certain limitations of the MINIX file system.[4][2] It was the first implementation that used 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.[2]
| Developer(s) | Rémy Card |
|---|---|
| Full name | extended file system |
| Introduced | April 1992 with Linux 0.96c |
| Discontinued | 14 January 1997 with Linux 2.1.21 |
| Preceded by | MINIX file system |
| Succeeded by | ext2 |
| Structures | |
| Directory contents | Table |
| File allocation |
|
| Bad blocks | Table |
| Limits | |
| Max volume size | 2 GB[2] |
| Max filename length | 255 characters[3] |
| Features | |
| File system permissions | Unix permissions |
| Transparent encryption | No |
| Copy-on-write | No |
ext was the first in the series of extended file systems. In 1993, it was superseded by both ext2 and Xiafs, which competed for a time, but ext2 won because of its long-term viability: ext2 remedied issues with ext, such as the immutability of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.[5]
Other extended file systems
editThere are other members in the extended file system family:
See also
editReferences
edit- ^ "freelists.c - fs/ext/freelists.c - Linux source code (2.1.20)". Bootlin. Retrieved 14 May 2023.
- ^ a b c Jones, M. Tim (17 February 2009). "Anatomy of ext4". IBM Developer Works. Archived from the original on 20 February 2015. Retrieved 8 February 2012.
- ^ "ext_fs.h - include/linux/ext_fs.h - Linux source code (0.96c-patch2)". Bootlin. Retrieved 14 May 2023.
- ^ "Rémy Card (Interview, April 1998)" (in French). April Association. 19 April 1999. Archived from the original on 4 February 2012. Retrieved 8 February 2012.
- ^ Card, Rémy; Ts'o, Theodore; Tweedie, Stephen. "Design and Implementation of the Second Extended Filesystem". Archived from the original on 4 February 2012. Retrieved 8 February 2012. First published in First Dutch International Symposium on Linux. State University of Groningen. 1995. ISBN 90-367-0385-9.
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