compat_xfs_fsop_handlereq_t
compat_xfs_fsop_handlereq_t __user *arg32)
compat_xfs_fsop_handlereq_t hreq32;
if (copy_from_user(&hreq32, arg32, sizeof(compat_xfs_fsop_handlereq_t)))
compat_xfs_fsop_handlereq_t *hreq)