ext2_htree_get_hash
next_hash = ext2_htree_get_hash(level->h_entry);
if (ext2_htree_get_hash(middle) > hash_major)
static uint32_t ext2_htree_get_hash(struct ext2fs_htree_entry *ep);
split_hash = ext2_htree_get_hash(entries + src_ent_num);