Boot File System
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The Boot File System (named BFS on Linux, but BFS also refers to the
Be File System The Be File System (BFS) is the native file system for the BeOS. In the Linux kernel, it is referred to as "BeFS" to avoid confusion with Boot File System. BFS was developed by Dominic Giampaolo and Cyril Meurillon over a ten-month period, st ...
) was used on
UnixWare UnixWare is a Unix operating system. It was originally released by Univel, a jointly owned venture of AT&T's Unix System Laboratories (USL) and Novell. It was then taken over by Novell. Via Santa Cruz Operation (SCO), it went on to Caldera Syst ...
to store files necessary to its boot process. It does not support directories, and only allows contiguous allocation for files, to make it simpler to be used by the boot loader.


Implementations

Besides the UnixWare support, Martin Hinner wrote a bfs kernel module for
Linux Linux ( ) is a family of open source Unix-like operating systems based on the Linux kernel, an kernel (operating system), operating system kernel first released on September 17, 1991, by Linus Torvalds. Linux is typically package manager, pac ...
that supports it. He documented the file system layout as part of the process. The Linux kernel implementation of BFS was written by Tigran Aivazian and it became part of the standard kernel sources on 28 October 1999 (Linux version 2.3.25). The original BFS was written at AT&T Bell Laboratories for the
UNIX System V Unix System V (pronounced: "System Five") is one of the first commercial versions of the Unix operating system. It was originally developed by AT&T and first released in 1983. Four major versions of System V were released, numbered 1, 2, 3, an ...
, Version 4.0 porting base in 1986. It was written by Ron Schnell, who is also the author of Dunnet (game). BFS was the first non-S5 (System V) Filesystem written using VFS (
Virtual Filesystem A virtual file system (VFS) or virtual filesystem switch is an abstract layer on top of a more concrete file system. The purpose of a VFS is to allow client applications to access different types of concrete file systems in a uniform way. A VFS ...
) for AT&T UNIX.


References

{{Filesystem Disk file systems Linux