cachestat
struct cachestat;
struct cachestat __user *cstat, unsigned int flags);
COND_SYSCALL(cachestat);
pgoff_t first_index, pgoff_t last_index, struct cachestat *cs)
SYSCALL_DEFINE4(cachestat, unsigned int, fd,
struct cachestat __user *, cstat, unsigned int, flags)
struct cachestat cs;
memset(&cs, 0, sizeof(struct cachestat));
if (copy_to_user(cstat, &cs, sizeof(struct cachestat)))
struct cachestat cs;
struct cachestat cs;
void print_cachestat(struct cachestat *cs)