typedef __int64_t prid_t; /* project ID */
typedef __uint32_t inst_t; /* an instruction */
-typedef __u64 xfs_off_t;
+typedef __s64 xfs_off_t; /* <file offset> type */
typedef __u64 xfs_ino_t; /* <inode> type */
typedef __s64 xfs_daddr_t; /* <disk address> type */
typedef char * xfs_caddr_t; /* <core address> type */