FUFH_RDONLY
fbuf->fb_io_fd = fusefs_fd_get(ip, FUFH_RDONLY);
enum fufh_type fufh_type = FUFH_RDONLY;
enum fufh_type fufh_type = FUFH_RDONLY;
if (ip->fufh[FUFH_RDONLY].fh_type == FUFH_INVALID) {
error = fusefs_file_open(fmp, ip, FUFH_RDONLY, O_RDONLY, 1, p);
fbuf->fb_io_fd = ip->fufh[FUFH_RDONLY].fh_id;
fusefs_file_close(fmp, ip, FUFH_RDONLY, O_RDONLY, 1, p);
case FUFH_RDONLY: