ht_add
if (wip->pg == NULL && ht_buckets != NULL && ht_add(wip->fmri)) {
if (ht_add(&conn->lc_requests, req->lr_req.hdr.tag, req)) {
if (ht_add(&conn->lc_files, fid, file) != 0) {
int ht_add(struct ht *h, uint32_t hash, void *value);