[pnfs] [PATCH 0/3] more layoutreturn fixes for draft-19

[Benny Halevy]

In reply to this message there are 3 patches that I submitted to the pnfs-d19 branch.

[PATCH 1/3] pnfsd: layoutreturn optional stateid in response only for RETURN_FILE
	This patch improves the implementation of the stateid the nfsd returns on
	layoutreturn so its returned only for RETURN_FILE.

[PATCH 2/3] pnfs: send lrf_body in layoutreturn draft-19
[PATCH 3/3] pnfsd: decode opaque lrf_body in layoutreturn draft-19

The two other patches are a skeleton implementation of client and server sides, respectively,
of the opaque lrf_body member of layoutreturn4.  The client currently always sends an
empty lrf_body until we provide an API for the LD to encode its own.
The server decodes lrf_body which is available for the exported file system via
struct nfsd4_pnfs_layoutreturn.