adler16
static uint32_t adler16(void *, int);
#define fh4_hash(fh) adler16((fh)->nfs_fh4_val, (fh)->nfs_fh4_len)
#define stateid_hash(st) adler16((st)->other, sizeof ((st)->other))
#define owner_hash(own) adler16((own)->owner_val, (own)->owner_len)