refactor the nfs4 server lock code to use last_byte_offset
to compute the last byte covered by the lock. Check for overflow
so that the last byte is set to NFS4_MAX_UINT64 if offset + len
wraps around.
Also, use NFS4_MAX_UINT64 for ~(u64)0 where appropriate.
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>