On Wed, Jun 11, 2003 at 02:08:28PM -0500, Matt Stegman wrote:
> On 11 Jun, Matthew Mitchell wrote:
> > What _about_ the filesystem and data, though? Some filesystems are
> > certainly written in a known byte-order, like ISO 9660. Are there any
> > of (ext3, XFS, JFS, reiserfs) that this is true for? Or are they all
> > written in cpu native byte-order?
>
> I know XFS always uses big-endian on disk; one of SGI's selling points
> was that you can move disks back and forth between MIPS and Intel
> computers. I think ext2/3 also uses the same format between big and
> little endian archs.
EXT2 has two on-disk byte orders, and kernel code understands both.
The MD physical format could be handled similarly. Present code
(drivers/md/md.c) becomes rather upset when it sees unexpected things.
This quick review was based on 2.4.20, and doesn't say anything
about 2.5 series.
Just for the kicks from linux/fs/ext2/super.c:
* Big-endian to little-endian byte-swapping/bitmaps by
* David S. Miller (davem@caip.rutgers.edu), 1995
Yes, it was made to support same disk at SPARC and at i386 ;-)
> --
> -Matt Stegman
/Matti Aarnio
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