ffs_mapsearch
bno = ffs_mapsearch(fs, cgp, bpref, (int) fs->fs_frag);
daddr_t ffs_mapsearch(struct fs *, struct cg *, daddr_t, int);
bno = ffs_mapsearch(fs, cgp, bpref, allocsiz);
bno = ffs_mapsearch(fs, cgp, bpref, allocsiz);
bno = ffs_mapsearch(fs, cgp, bpref, (int)fs->fs_frag);
static int32_t ffs_mapsearch(struct fs *, struct cg *, daddr_t, int);