NFS stat exporter: Add per-share stat support.
Reject state for file when owner has state on file via another export

To maintain locks and share reservations beloning to an export,
we assure that a given state owner may only have a locks or an
open on a given file under one export. If he uses a handle from
a different export to acquire state, it will be rejected
with EINVAL.

Signed-off-by: Frank Filz <ffilzlnx@us.ibm.com>
Reject lock if owner already has locks via another export

Signed-off-by: Frank Filz <ffilzlnx@us.ibm.com>
Added UPCALLS interface by default to GPFS_FSAL.
Added a function during BuildExportEntry() to support FSAL specific checks.
Pass reference to writeverf to DS_write and DS_commit

This makes it a char ** rather than a char *, so make sure to
dereference writeverf in the fsal_ds.c if passing it as an argument to
memcpy or similar.
Quick alignment fix and read/write/commit merge

This patch contains two fixes because the first requires the second.

Marc Eshel pointed out that memory allocated with posix_memalign was
being freed (unsuccessfully) with Mem_Free.  This is a quick fix to
add Mem_Alloc_Page_Aligned and Free_Page_Aligned calls for use in
read.  This is not a long-term solution, but solves the memory leak
and errors until more work on memory allocation can be done.

However, the NFSv4 READ request can be serviced by either nfs4_op_read
or nfs41_op_read, it can only be freed by nfs4_op_read_Free.
Therefore this patch also merges nfs41_op_read with nfs4_op_read,
nfs41_op_write with nfs4_op_write, and nfs41_op_commit with
nfs4_op_commit.  These functions have more similarity than difference
and should be merged anyway, regardless of memory alignment.
pNFS Refactor

Move pNFS functionality back for common use.  Clean up configure,
automake, and conditional compile options.  Within the C code there are three defines:

 _PNFS: Some pNFS functionality has been enabled, for common code.
 _PNFS_MDS: Metadata server functionality has been enabled
 _PNFS_DS: Data server functionality has been enabled

And three corresponding automake variables

 USE_PNFS, USE_PNFS_MDS, and USE_PNFS_DS

In order to let the Shell compile cleanly without pulling in the
entire NFS daemon, pNFS functionality has been split out from other
FSAL functionality.  Be sure to set FSALPNFS_LIB for your FSAL to get
it to link in.

Not yet done:

  The PARALLELL_FS code has not been refactored to work with the rest
  of the pNFS system.

  The configuration options to disable or enable pNFS support on a
  per-export basis need to be looked at.

  This probably does not work with a shared FSAL.  I was going to wait
  until after Jim Lieb's refactor branch hit mainline to address that.
Quota management : now available for NFSv4.x as well
Fix compiler warnings in latest upstream next branch

Signed-off-by: Frank Filz <ffilzlnx@us.ibm.com>

Conflicts:

	src/SAL/nfs4_lease.c
	src/include/sal_functions.h

Signed-off-by: Frank Filz <ffilzlnx@us.ibm.com>
Clean up from rebase and connectathon changes
Fix pnfs_segment_contains

Fix bug reported by Marc Eshel.  This function should return true for
any sub-segment, even an improper one.
Fix Ceph cookie problem pointed out by Philippe