xfs: implement pNFS export operations

Add operations to export pNFS block layouts from an XFS filesystem.  See
the previous commit adding the operations for an explanation of them.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>

diff --cc fs/xfs/Makefile
Simple merge

diff --cc fs/xfs/xfs_export.c
Simple merge

diff --cc fs/xfs/xfs_fsops.c
Simple merge

diff --cc fs/xfs/xfs_iops.c
Simple merge

diff --cc fs/xfs/xfs_iops.h
Simple merge

diff --cc fs/xfs/xfs_mount.h
Simple merge

diff --cc fs/xfs/xfs_pnfs.c
Simple merge

diff --cc fs/xfs/xfs_pnfs.h
Simple merge