fs_spc            243 ufs/ffs/fs.h   	int32_t	 fs_spc;		/* sectors per cylinder */
fs_spc            500 ufs/ffs/fs.h       (fsbtodb(fs, bno) / (fs)->fs_spc)
fs_spc            503 ufs/ffs/fs.h        (fsbtodb(fs, bno) % (fs)->fs_spc / (fs)->fs_nsect * (fs)->fs_trackskew + \
fs_spc            504 ufs/ffs/fs.h        fsbtodb(fs, bno) % (fs)->fs_spc % (fs)->fs_nsect * (fs)->fs_interleave) % \