fo_close
err1 = (f->f_ops->fo_close)(f);
int (*fo_close)(struct open_file *);
.fo_close = dmabuf_close,
.fo_close = nbsd_nvmm_close,
error = fo_close(fp);
.fo_close = badfo_close,
.fo_close = kqueue_close,
.fo_close = mq_close_fop,
.fo_close = pipe_close,
.fo_close = soo_close,
.fo_close = vn_closefile,
int (*fo_close) (struct file *fp);
return ((*fp->f_ops->fo_close)(fp));
.fo_close = devfs_fo_close,