620 struct cftype {  struct
625 	char name[MAX_CFTYPE_NAME];
626 	unsigned long private;
632 	size_t max_write_len;
635 	unsigned int flags;
660 	u64 (*read_u64)(struct cgroup_subsys_state *css, struct cftype *cft);  argument
664 	s64 (*read_s64)(struct cgroup_subsys_state *css, struct cftype *cft);  argument
679 	int (*write_u64)(struct cgroup_subsys_state *css, struct cftype *cft,  argument
684 	int (*write_s64)(struct cgroup_subsys_state *css, struct cftype *cft,  argument
693 	ssize_t (*write)(struct kernfs_open_file *of,
696 	__poll_t (*poll)(struct kernfs_open_file *of,
699 	struct lock_class_key	lockdep_key;