311 struct cftype {  struct
331 	ssize_t (*read)(struct cgroup *cgrp, struct cftype *cft,  argument
338 	u64 (*read_u64)(struct cgroup *cgrp, struct cftype *cft);  argument
342 	s64 (*read_s64)(struct cgroup *cgrp, struct cftype *cft);  argument
349 	int (*read_map)(struct cgroup *cont, struct cftype *cft,  argument
355 	int (*read_seq_string)(struct cgroup *cont, struct cftype *cft,  argument
358 	ssize_t (*write)(struct cgroup *cgrp, struct cftype *cft,  argument
367 	int (*write_u64)(struct cgroup *cgrp, struct cftype *cft, u64 val);  argument
371 	int (*write_s64)(struct cgroup *cgrp, struct cftype *cft, s64 val);  argument
378 	int (*write_string)(struct cgroup *cgrp, struct cftype *cft,  argument
392 	 * waiter for changes related to the cftype. Implement it if  argument
396 	int (*register_event)(struct cgroup *cgrp, struct cftype *cft,  argument
404 	void (*unregister_event)(struct cgroup *cgrp, struct cftype *cft,  argument