int submit_aio(enum aio_type type, int io_fd, char *buf, int len, unsigned long long offset, int reply_fd, struct aio_context *aio)
int submit_aio(struct aio_context *aio)
int submit_aio(enum aio_type type, int io_fd, char *buf, int len,               unsigned long long offset, int reply_fd,               struct aio_context *aio){        aio->reply_fd = reply_fd;        if(aio_24)                return submit_aio_24(type, io_fd, buf, len, offset, aio);        else {                return submit_aio_26(type, io_fd, buf, len, offset, aio);        }}