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SubjectRe: [ANN] Squashfs 3.3 released
Christoph Hellwig wrote:
> On Wed, Nov 21, 2007 at 02:02:43PM +0000, Phillip Lougher wrote:
>> Unfortunately the move to fixed little endian filesystem will involve
>> another filesystem layout change. The current filesystem layout still
>> uses packed bitfield structures, and it is impossible to swap these
>> using the standard kernel swap macros. Removal of my routines that can
>> properly swap packed bitfield structures is another change demanded by
>> the Linux kernel mailing list.
>
> The normal way to do it is to use shift and mask after doing the endian
> conversion. But the problem with bitfields is that they can have different
> kinds of layouts depending on the compiler or abi which is another reason
> to avoid them in ondisk/wire formats.
>

Yes, the bitfields are packed differently on little and big endian
architectures which mean they appear in different places in the
structure. I want to move away from that mess when I move to little
endian only.

Phillip

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