dtog              284 ufs/ext2fs/ext2fs.h #define	dtog(fs, d) (((d) - (fs)->e2fs.e2fs_first_dblock) / (fs)->e2fs.e2fs_fpg)
dtog              490 ufs/ffs/fs.h   #define	dtog(fs, d)	((d) / (fs)->fs_fpg)