xfs_fsop_geom_v4  803 fs/xfs/libxfs/xfs_fs.h #define XFS_IOC_FSGEOMETRY_V4	     _IOR ('X', 124, struct xfs_fsop_geom_v4)
xfs_fsop_geom_v4 1022 fs/xfs/xfs_ioctl.c 		len = sizeof(struct xfs_fsop_geom_v4);