Extended file system
| Developer(s) | Rémy Card |
|---|---|
| Full name | extended file system |
| Introduced | April 1992 with Linux 0.96c |
| 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 |
The extended file system, or ext, was implemented in April 1992 as the first file system created specifically for the Linux kernel. 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]
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 In 1993, it was superseded by both ext2 and Xiafs, which competed for a time, but ext2 won because of its long-term viability: ext2 remedied issues with ext, such as the immutability of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
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
- ↑ "freelists.c - fs/ext/freelists.c - Linux source code (2.1.20)". https://elixir.bootlin.com/linux/2.1.20/source/fs/ext/freelists.c#L13.
- ↑ 2.0 2.1 2.2 Jones, M. Tim (17 February 2009). "Anatomy of ext4". IBM Developer Works. http://www.ibm.com/developerworks/linux/library/l-anatomy-ext4/.
- ↑ "ext_fs.h - include/linux/ext_fs.h - Linux source code (0.96c-patch2)". https://elixir.bootlin.com/linux/0.96c-patch2/source/include/linux/ext_fs.h.
- ↑ "Rémy Card (Interview, April 1998)" (in fr). April Association. 19 April 1999. http://www.april.org/groupes/entretiens/remy_card.html.
- ↑ Card, Rémy; Ts'o, Theodore; Tweedie, Stephen. "Design and Implementation of the Second Extended Filesystem". http://e2fsprogs.sourceforge.net/ext2intro.html. First published in First Dutch International Symposium on Linux. State University of Groningen. 1995. ISBN 90-367-0385-9. https://books.google.com/books?id=vRfKYgEACAAJ.
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