Define two nfs export_operation structures,one for 'stale_rw' mounts and
the other for 'nostale_ro'.  The latter uses i_pos as a basis for encoding
and decoding file handles.

Also, assign i_pos to kstat->ino.  The logic for rebuilding the inode is
added in the subsequent patches.
Signed-off-by: NNamjae Jeon <namjae.jeon@samsung.com>
Signed-off-by: NRavishankar N <ravi.n1@samsung.com>
Signed-off-by: NAmit Sahrawat <a.sahrawat@samsung.com>
Acked-by: NOGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>