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>

fs/locks.c

@@ -276,8 +276,10 @@ void locks_release_private(struct file_lock *fl)
 	}
 
 	if (fl->fl_lmops) {
-		if (fl->fl_lmops->lm_put_owner)
-			fl->fl_lmops->lm_put_owner(fl);
+		if (fl->fl_lmops->lm_put_owner) {
+			fl->fl_lmops->lm_put_owner(fl->fl_owner);
+			fl->fl_owner = NULL;
+		}
 		fl->fl_lmops = NULL;
 	}
 }
@@ -333,7 +335,7 @@ void locks_copy_conflock(struct file_lock *new, struct file_lock *fl)
 
 	if (fl->fl_lmops) {
 		if (fl->fl_lmops->lm_get_owner)
-			fl->fl_lmops->lm_get_owner(new, fl);
+			fl->fl_lmops->lm_get_owner(fl->fl_owner);
 	}
 }
 EXPORT_SYMBOL(locks_copy_conflock);

fs/nfsd/nfs4state.c

@@ -4932,20 +4932,22 @@ nfs4_transform_lock_offset(struct file_lock *lock)
 		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  = {

include/linux/fs.h

@@ -893,8 +893,8 @@ struct file_lock_operations {
 struct lock_manager_operations {
 	int (*lm_compare_owner)(struct file_lock *, struct file_lock *);
 	unsigned long (*lm_owner_key)(struct file_lock *);
-	void (*lm_get_owner)(struct file_lock *, struct file_lock *);
-	void (*lm_put_owner)(struct file_lock *);
+	fl_owner_t (*lm_get_owner)(fl_owner_t);
+	void (*lm_put_owner)(fl_owner_t);
 	void (*lm_notify)(struct file_lock *);	/* unblock callback */
 	int (*lm_grant)(struct file_lock *, int);
 	bool (*lm_break)(struct file_lock *);