19 Jan
2023
19 Jan
'23
8:17 a.m.
On Wed, Jan 18, 2023 at 4:20 PM Theodore Ts'o <tytso(a)mit.edu> wrote:
Just coincidentally, there is currently discussion in
Linux kernel
circles about whether it's time to drop support for JFS. JFS was
originally from OS/2 and then ported to Linux and AIX, although JFS
for Linux and JFS2 for AIX have diverged. JFS has been in maintenance
mode in 2008, and the number of users is close to zero at this point.
Well the original JFS was introduced with AIX 3.1 in 1990. A new JFS
started from that and was introduced with an OS/2 in 1999 and made
its way back to AIX.
From the 12/16/2002 JFS mini-FAQ:
Q1. What is the history of the source based use for the port of JFS for Linux.
A1. IBM introduced its UNIX file system as the Journaled File System (JFS)
with the initial release of AIX Version 3.1. This file system, now
called JFS1 on AIX, has been the premier file system for AIX over the
last 10 years and has been installed in millions of customer's AIX
systems. In 1995, work began to enhance the file system to be more
scalable and to support machines that had more than one
processor. Another goal was to have a more portable file system,
capable of running on multiple operating systems.
Historically, the JFS1 file system is very closely tied to the memory
manager of AIX. This design is typical of a closed-source operating
system, or a file system supporting only one operating system.
The new Journaled File System, on which the Linux port was based, was
first shipped in OS/2 Warp Server for eBusiness in April, 1999, after
several years of designing, coding, and testing. It also shipped with
OS/2 Warp Client in October, 2000. In parallel to this effort, some
of the JFS development team returned to the AIX Operating System
Development Group in 1997 and started to move this new JFS source base
to the AIX operating system. In May, 2001, a second journaled file
system, Enhanced Journaled File System (JFS2), was made available for
AIX 5L. In December of 1999, a snapshot of the original OS/2 JFS
source was taken and work was begun to port JFS to Linux.
Jim