struct list_head sai_item;
struct dentry *sai_dentry;
atomic_t sai_refcount; /* On access, hold refcount */
+ atomic_t sai_inuse_count;/* inuse entry count */
unsigned int sai_max; /* max ahead of lookup */
__u64 sai_sent; /* stat requests sent count */
__u64 sai_replied; /* stat req which recv reply */