Symbol: ZAP_HASH_IDX
stand/libsa/zfs/zfsimpl.c
2756
#define ZAP_HASH_IDX(hash, n) (((n) == 0) ? 0 : ((hash) >> (64 - (n))))
sys/cddl/boot/zfs/zfsimpl.h
1574
#define ZAP_HASH_IDX(hash, n) (((n) == 0) ? 0 : ((hash) >> (64 - (n))))