Btrfs: use __u64 types in ioctl.h

Signed-off-by: Sage Weil <sage@newdream.net>
Signed-off-by: Chris Mason <chris.mason@oracle.com>

fs/btrfs/ioctl.h

@@ -127,14 +127,14 @@ struct btrfs_ioctl_defrag_range_args {
 };
 
 struct btrfs_ioctl_space_info {
-	u64 flags;
-	u64 total_bytes;
-	u64 used_bytes;
+	__u64 flags;
+	__u64 total_bytes;
+	__u64 used_bytes;
 };
 
 struct btrfs_ioctl_space_args {
-	u64 space_slots;
-	u64 total_spaces;
+	__u64 space_slots;
+	__u64 total_spaces;
 	struct btrfs_ioctl_space_info spaces[0];
 };