Re: [Jfs-discussion] VFS: Mounted root (msdos filesystem) - which is jfs instead

[Dave K. <sh...@au...>]

On Sun, 2004-03-28 at 09:09, Per Jessen wrote:
> Alright, then it's getting a bit more complicated - more than I can 
> deal with. Maybe some of the others here can help out. I think there's
> a file system magic number or somesuch that the kernel uses to identify
> the file system, maybe this somehow got corrupted? But I'm really making
> wild guesses here ...

For historical reasons, jfs doesn't use the first 64 sectors of the
partition.  Instead it stores its superblock at offset 64*512.  mkfs.jfs
zeros the first 32K of the volume.  I'm pretty sure that msdos file
systems store their equivalent to the superblock in the first sector. 
Normally, this is zero for jfs, but it sounds like you may have
something there that msdos recognizes.  I have no idea how that could
have happened.

Is it possible to boot from that partition with the kernel parameter
"rootfstype=jfs"?

Thanks,
Shaggy
-- 
David Kleikamp
IBM Linux Technology Center