rem: list_add(&req->list, &sf->write_req_list);
add: list_add(&req->list, &sf->write_reqs);
context: static void sshfs_write_begin(struct request *req){    struct sshfs_file *sf = (struct sshfs_file *) req->data;    pthread_mutex_lock(&lock);    list_add(&req->list, &sf->write_req_list);    pthread_mutex_unlock(&lock);}