locks: rename lock-manager ops

Both the filesystem and the lock manager can associate operations with a
lock.  Confusingly, one of them (fl_release_private) actually has the
same name in both operation structures.

It would save some confusion to give the lock-manager ops different
names.

Signed-off-by: J. Bruce Fields <bfields@redhat.com>
diff --git a/include/linux/fs.h b/include/linux/fs.h
index b5b9792..cf719be 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1069,12 +1069,12 @@
 };
 
 struct lock_manager_operations {
-	int (*fl_compare_owner)(struct file_lock *, struct file_lock *);
-	void (*fl_notify)(struct file_lock *);	/* unblock callback */
-	int (*fl_grant)(struct file_lock *, struct file_lock *, int);
-	void (*fl_release_private)(struct file_lock *);
-	void (*fl_break)(struct file_lock *);
-	int (*fl_change)(struct file_lock **, int);
+	int (*lm_compare_owner)(struct file_lock *, struct file_lock *);
+	void (*lm_notify)(struct file_lock *);	/* unblock callback */
+	int (*lm_grant)(struct file_lock *, struct file_lock *, int);
+	void (*lm_release_private)(struct file_lock *);
+	void (*lm_break)(struct file_lock *);
+	int (*lm_change)(struct file_lock **, int);
 };
 
 struct lock_manager {