claimant
claimant_t *claimant;
claimant = avl_find(&dup->fr_claimants, &key, &where);
if (claimant == NULL) {
claimant = alloc_claimant(ino, lfn);
avl_insert(&dup->fr_claimants, (void *)claimant, where);
claimant_t *claimant;
claimant = avl_find(&dup->fr_claimants, &key, &where);
if (claimant != NULL) {
avl_remove(&dup->fr_claimants, claimant);