nfsd4: initialize special stateid's at compile time

Stateid's with "other" ("opaque") field all zeros or all ones are
reserved.  We define all_ones separately on the off chance there will be
more such some day, though currently all the other special stateid's
have zero other field.
Signed-off-by: NJ. Bruce Fields <bfields@redhat.com>

fs/nfsd/nfs4state.c

@@ -49,12 +49,20 @@
 time_t nfsd4_lease = 90;     /* default lease time */
 time_t nfsd4_grace = 90;
 static time_t boot_time;
-static stateid_t zerostateid;             /* bits all 0 */
-static stateid_t onestateid;              /* bits all 1 */
+
+#define all_ones {{~0,~0},~0}
+static const stateid_t one_stateid = {
+	.si_generation = ~0,
+	.si_opaque = all_ones,
+};
+static const stateid_t zero_stateid = {
+	/* all fields zero */
+};
+
 static u64 current_sessionid = 1;
 
-#define ZERO_STATEID(stateid) (!memcmp((stateid), &zerostateid, sizeof(stateid_t)))
-#define ONE_STATEID(stateid)  (!memcmp((stateid), &onestateid, sizeof(stateid_t)))
+#define ZERO_STATEID(stateid) (!memcmp((stateid), &zero_stateid, sizeof(stateid_t)))
+#define ONE_STATEID(stateid)  (!memcmp((stateid), &one_stateid, sizeof(stateid_t)))
 
 /* forward declarations */
 static int check_for_locks(struct nfs4_file *filp, struct nfs4_lockowner *lowner);
@@ -4564,7 +4572,6 @@ nfs4_state_init(void)
 	}
 	for (i = 0; i < LOCKOWNER_INO_HASH_SIZE; i++)
 		INIT_LIST_HEAD(&lockowner_ino_hashtbl[i]);
-	memset(&onestateid, ~0, sizeof(stateid_t));
 	INIT_LIST_HEAD(&close_lru);
 	INIT_LIST_HEAD(&client_lru);
 	INIT_LIST_HEAD(&del_recall_lru);