OS/2, eCS & ArcaOS - Technical > Storage

HPFS and JFS internal definition specifications

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RickCHodgin:
Can somebody point me to a link for HPFS and JFS specs showing the physical layout of data in those file formats?

And is there an open source implementation of these file systems?  I'd like to write one if not.

Thank you,
Rick C. Hodgin

Dave Yeo:
There's a fairly complete HPFS implementation in the Linux kernel, and of course, the JFS code in the Linux kernel is a fork of our JFS. The fork happened with this code, https://github.com/OS2World/DRV-JFS-GPL
Note that the Linux JFS is no longer compatible with our bootable JFS.

RickCHodgin:

--- Quote from: Dave Yeo on June 01, 2017, 05:52:37 pm ---There's a fairly complete HPFS implementation in the Linux kernel, and of course, the JFS code in the Linux kernel is a fork of our JFS. The fork happened with this code, https://github.com/OS2World/DRV-JFS-GPL
Note that the Linux JFS is no longer compatible with our bootable JFS.

--- End quote ---

How much do you know about these file systems?

Thank you,
Rick C. Hodgin

Dariusz Piatkowski:
Rick,

What specific information are you looking for?

I spent some time writing an enhanced version of 'cache386 /s' command. Not quite sure to be honest if I ever finished this, it was really more of a learning effort to undertsand OS/2, the programming platform, etc.

Anyways...since I have been a heavy HPFS386 user I have some pretty good amount of docs on these. Most of it sourced on-line, some of it may still float out there. Bulk of this is system calls/APIs though...

guzzi:
Jan van Wijk, author of DFSee, is likely very well acquinted with the structures of several file systems. You might drop him a line.

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