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Re: Mounting old BSD filesystem



On Tue, 4 Mar 2025, Michael van Elst wrote:
netbsd%precedence.co.uk@localhost (Stephen Borrill) writes:

Looking good! Also mmm, a kernel that's 800k in size :-)

Are these changes commitable?

I didn't change any code, just modified the superblock
a little bit. In particular, it now says it is 8k in size
and some bits that were undefined (all 1's) but are
interpreted by our kernel, are now set.

Ah, I see. You adjusted the filesystem to fit the kernel rather than the other way round.

Shouldn't be difficult to make the kernel accept the
original superblock.

This is a potentially live filesystem type, not a historical archive. There appears to have been a resurgence in running RISCiX both under emulation and on real hardware.

N.B. fsck and other userland tools are still confused
by the "alternate superblocks". I guess these also need
to be more relaxed about undefined bits.

Let me know if there's anything I can do to help.

Stephen



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