tmpfs_reg_resize
int tmpfs_reg_resize(struct vnode *, off_t, boolean_t);
error = node->tn_size == length ? 0 : tmpfs_reg_resize(vp, length,
error = tmpfs_reg_resize(vp, uio->uio_offset + uio->uio_resid,
(void)tmpfs_reg_resize(vp, oldsize, TRUE);