BtHash *lrufirst; // lru list head
BtHash *lrulast; // lru list tail
ushort *cache; // hash table for cached segments
BtHash nodes[1]; // segment cache follows
BtHash *lrufirst; // lru list head
BtHash *lrulast; // lru list tail
ushort *cache; // hash table for cached segments
BtHash nodes[1]; // segment cache follows