extern void xtInitRoot(tid_t tid, struct inode *ip);
extern int xtInsert(tid_t tid, struct inode *ip,
int xflag, s64 xoff, int xlen, s64 * xaddrp, int flag);
extern void xtInitRoot(tid_t tid, struct inode *ip);
extern int xtInsert(tid_t tid, struct inode *ip,
int xflag, s64 xoff, int xlen, s64 * xaddrp, int flag);