Re: [ANN] Squashfs 3.0 released

[Phillip Lougher]

On 17 Mar 2006, at 16:00, Jeff Garzik wrote:

> Jörn Engel wrote:
> > On Fri, 17 March 2006 11:16:48 +0000, Phillip Lougher wrote:
> > > > The one still painfully missing is a
> > > > fixed-endianness disk format.
> > >
> > > We had that argument last year.
> > Yes, I remember.  What I don't remember is your opinion on the  
> > matter.
> > Did we reach some sort of conclusion?
>
> Fixed endian isn't necessarily a requirement.  Detectable endian  
> is.  As long as (a) the filesystem mkfs notes the endian-ness and  
> (b) the kernel filesystem code properly handles both types of  
> endian, life is fine.
That's what is currently done.  There are two filesystem formats, big  
endian (donated by Squashfs magic of 'sqsh') and little endian  
(denoted by Squashfs magic of 'hsqs').  The kernel code detects the  
filesystem endianness and swaps if necessary.

> For SquashFS, though, I would think that fixed endian would be  
> easy. Since it is byte-packed, just handle endian as you unpack.
That's what is currently done.  The data is swapped if necessary at  
unpack time.  Afterwards no further swapping is performed.

Phillip
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