ffs_isfreeblock  1726 ufs/ffs/ffs_alloc.c 		if (!ffs_isfreeblock(fs, cg_blksfree(cgp), blkno)) {
ffs_isfreeblock   130 ufs/ffs/ffs_extern.h int   ffs_isfreeblock(struct fs *, unsigned char *, daddr_t);
ffs_isfreeblock    84 ufs/ffs/ffs_subr.c int	ffs_isfreeblock(struct fs *, unsigned char *, daddr_t);