extern int fs_noerr(void);
extern int fs_nosys(void);
-extern int fs_nodev(void);
extern void fs_noval(void);
extern void fs_tosspages(bhv_desc_t *, xfs_off_t, xfs_off_t, int);
extern void fs_flushinval_pages(bhv_desc_t *, xfs_off_t, xfs_off_t, int);