exofs RAID0 support

Submitted for review a striped IO support in exofs. Borrowing from pnfs-objects-layout,
stripping can be optionally combined with mirroring.

The code was tested and passes tests. An associated patch to pnfs-objects-layout and
pnfsd-exofs which enables striping export over pnfs, is also tested. (Not included in
this patchset)

So without further ado:
[PATCH 1/8] exofs: debug print even less
[PATCH 2/8] exofs: Micro-optimize exofs_i_info

	A couple of patches for next Kernel, not really related.

[PATCH 3/8] exofs: Recover in the case of read-passed-end-of-file
[PATCH 4/8] exofs: Move layout related members to a layout structure
[PATCH 5/8] exofs: unindent exofs_sbi_read

	These are some preliminary preparations that stand by themselves

[PATCH 6/8] exofs: Define on-disk per-inode optional layout attribute
[PATCH 7/8] exofs: RAID0 support

	Finally the RAID0 support

[PATCH 8/8] exofs: convert io_state to use pages array instead of bio at input

	And, a now requested change

Thank you for reviewing
Boaz
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