OS/2, eCS & ArcaOS - Technical > Storage

HPFS and JFS internal definition specifications

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Martin Iturbide:
Hi Rick

If you have interest on developing a file system for OS/2-ArcaOS I may suggest the following ideas.

1) HPFS. Even that we have an HPFS file system driver, there is no open source implementation of it. You may get some information of HPFS also at the EDM/2.

2) Bootable JFS: Even that we already have that available, it is not open source. It is based on IBM's DDK source code which can not be open to the public and non-open source compatible. Maybe evolving the JFS open source project so it can boot can be an interesting project.

3) ZFS : I hear that ZFS is an interesting file system format and there is the OpenZFS project. Maybe ZFS can be an interesting alternative to HPFS and JFS to boot OS/2 from that.

Just some thoughts.

Regards

RickCHodgin:

--- Quote from: Martin Iturbide on June 02, 2017, 12:24:08 am ---Hi Rick

If you have interest on developing a file system for OS/2-ArcaOS I may suggest the following ideas.

1) HPFS. Even that we have an HPFS file system driver, there is no open source implementation of it. You may get some information of HPFS also at the EDM/2.

2) Bootable JFS: Even that we already have that available, it is not open source. It is based on IBM's DDK source code which can not be open to the public and non-open source compatible. Maybe evolving the JFS open source project so it can boot can be an interesting project.

3) ZFS : I hear that ZFS is an interesting file system format and there is the OpenZFS project. Maybe ZFS can be an interesting alternative to HPFS and JFS to boot OS/2 from that.

Just some thoughts.

--- End quote ---

Your thoughts are appreciated.

About a year ago you made some suggestions that instead of me writing my own replacement open source kernel for OS/2, that I work on some OS/2 applications and other things.  At that time it was beyond my area of interest because writing a kernel and doing other types of OS/2 programming are really very different tasks even though they might seem similar.  I still want to write the replacement kernel, but until then I would like to work on some smaller tasks that I can complete in a week or a few weeks max.

You had offered some ideas or suggestions, so let me throw the whole thing back to you and the community again and ask generally, a year later even:  What would the community like best for me to work on?

I'll start there and move forward.

Thank you,
Rick C. Hodgin

RickCHodgin:

--- Quote from: Martin Iturbide on June 02, 2017, 12:24:08 am ---1) HPFS. Even that we have an HPFS file system driver, there is no open source implementation of it. You may get some information of HPFS also at the EDM/2.

--- End quote ---

In initially looking at HPFS it is intriguing. :-)  Documentation shows it is limited to 64 GB as implemented, but 2 TiB is theoretically possible.

It would be exciting. :-)

Thank you,
Rick C. Hodgin

RickCHodgin:
Does anybody know if Gordon Letwin is still alive?  He wrote the HPFS specification and is from Indianapolis, IN where I'm from! :-)

I wonder if he's available for consultation?  Maybe in his retirement he's pining back for his old OS/2 days again and would be willing to work on helping me write my kernel and implement all manner of drivers?  I would love it.  Love it I say! :-)

Thank you,
Rick C. Hodgin

RickCHodgin:
Martin, do you have these HPFS folder files somewhere?  This one is referenced specifically (www . os2world . com / images / hpfs / fig5 . png):


It's missing, and it's linked on this page:
http://www.edm2.com/index.php/HPFS

Thank you,
Rick C. Hodgin

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