pnfs-obj: pnfs-objects layout driver submission

This is the complete and squashed version of the pnfs objects layout driver plus the needed changes from the pnfs-core to support more then one LD.

[PATCH 01/32] NFSv4.1: fix typo in filelayout_check_layout
[PATCH 02/32] NFSv4.1: use struct nfs_client to qualify deviceid [PATCH 03/32] pnfs: resolve header dependency in pnfs.h
[PATCH 04/32] NFSv4.1: make deviceid cache global
[PATCH 05/32] NFSv4.1: purge deviceid cache on nfs_free_client [PATCH 06/32] pnfs: CB_NOTIFY_DEVICEID
[PATCH 07/32] NFSv4.1: use layout driver in global device cache [PATCH 08/32] SUNRPC: introduce xdr_init_decode_pages
[PATCH 09/32] pnfs: Use byte-range for layoutget
[PATCH 10/32] pnfs: align layoutget requests on page boundaries [PATCH 11/32] pnfs: Use byte-range for cb_layoutrecall
[PATCH 12/32] pnfs: client stats
[PATCH 13/32] pnfs-obj: objlayoutdriver module skeleton
[PATCH 14/32] pnfs-obj: pnfs_osd XDR definitions
[PATCH 15/32] pnfs-obj: pnfs_osd XDR client implementation
[PATCH 16/32] pnfs-obj: decode layout, alloc/free lseg
[PATCH 17/32] pnfs-obj: objio_osd device information retrieval and caching [PATCH 18/32] pnfs: alloc and free layout_hdr layoutdriver methods [PATCH 19/32] pnfs-obj: define per-inode private structure
[PATCH 20/32] pnfs: support for non-rpc layout drivers
[PATCH 21/32] pnfs-obj: osd raid engine read/write implementation [PATCH 22/32] pnfs: layoutreturn
[PATCH 23/32] pnfs: layoutret_on_setattr
[PATCH 24/32] pnfs: encode_layoutreturn
[PATCH 25/32] pnfs-obj: report errors and .encode_layoutreturn Implementation. [PATCH 26/32] pnfs: encode_layoutcommit
[PATCH 27/32] pnfs-obj: objlayout_encode_layoutcommit implementation [PATCH 28/32] NFSv4.1: unify pnfs_pageio_init functions
[PATCH 29/32] NFSv4.1: change pg_test return type to bool
[PATCH 30/32] NFSv4.1: use pnfs_generic_pg_test directly by layout driver [PATCH 31/32] NFSv4.1: define nfs_generic_pg_test
[PATCH 32/32] pnfs-obj: pg_test check for max_io_size

I'll send the git tree address as separate email.

Thanks
Boaz