hammer_ioc_rebalance
struct hammer_ioc_rebalance rebal;
int hammer_ioc_rebalance(hammer_transaction_t trans, hammer_inode_t ip,
struct hammer_ioc_rebalance *rebal);
error = hammer_ioc_rebalance(&trans, ip,
(struct hammer_ioc_rebalance *)data);
#define HAMMERIOC_REBALANCE _IOWR('h',15,struct hammer_ioc_rebalance)
rebalance_node(struct hammer_ioc_rebalance *rebal, hammer_cursor_t cursor,
static int rebalance_node(struct hammer_ioc_rebalance *rebal,
struct hammer_ioc_rebalance *rebal)