Btrfs and endian convert

[Qu Wenruo]

Hi Marek,

I respect your independent implementation of btrfs inside U-boot, but it
looks like the code is too creative, other than follow the regular btrfs
code.

One of the biggest problem is, there is no convert of on-disk endian and
in-memory endian.

The most obvious proof is the lack of btrfs_disk_key, on-disk
btrfs_disk_key is returned and used against native endian btrfs_key.

Is U-boot only supposed to be run on little endian system?

And, would you mind me to do the full cross port of btrfs-progs code to
U-boot?
I found a lot of practice pretty far away from the common code base of
btrfs-progs and kernel, like using on-disk key pointer a lot (which
should be avoid due to endian convert).

Mind me to re-build the btrfs implementation from scratch?

Thanks,
Qu

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