locks: change lm_get_owner and lm_put_owner prototypes

The current prototypes for these operations are somewhat awkward as they
deal with fl_owners but take struct file_lock arguments. In the future,
we'll want to be able to take references without necessarily dealing
with a struct file_lock.

Change them to take fl_owner_t arguments instead and have the callers
deal with assigning the values to the file_lock structs.

Signed-off-by: Jeff Layton <jlayton@primarydata.com>
diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index 8ba1d88..326a545 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -4932,20 +4932,22 @@
 		lock->fl_end = OFFSET_MAX;
 }
 
-static void nfsd4_fl_get_owner(struct file_lock *dst, struct file_lock *src)
+static fl_owner_t
+nfsd4_fl_get_owner(fl_owner_t owner)
 {
-	struct nfs4_lockowner *lo = (struct nfs4_lockowner *)src->fl_owner;
-	dst->fl_owner = (fl_owner_t)lockowner(nfs4_get_stateowner(&lo->lo_owner));
+	struct nfs4_lockowner *lo = (struct nfs4_lockowner *)owner;
+
+	nfs4_get_stateowner(&lo->lo_owner);
+	return owner;
 }
 
-static void nfsd4_fl_put_owner(struct file_lock *fl)
+static void
+nfsd4_fl_put_owner(fl_owner_t owner)
 {
-	struct nfs4_lockowner *lo = (struct nfs4_lockowner *)fl->fl_owner;
+	struct nfs4_lockowner *lo = (struct nfs4_lockowner *)owner;
 
-	if (lo) {
+	if (lo)
 		nfs4_put_stateowner(&lo->lo_owner);
-		fl->fl_owner = NULL;
-	}
 }
 
 static const struct lock_manager_operations nfsd_posix_mng_ops  = {