file = fdt->fd[fd];
file = rcu_dereference(fdt->fd[fd]);
static inline struct file * fcheck_files(struct files_struct *files, unsigned int fd){	struct file * file = NULL;	struct fdtable *fdt = files_fdtable(files);	if (fd < fdt->max_fds)		file = fdt->fd[fd];	return file;}