ffs_alloccg
static daddr_t ffs_alloccg(struct inode *, u_int, daddr_t, int, int, int);
bno = ffs_hashalloc(ip, cg, bpref, size, 0, flags, ffs_alloccg);
bno = ffs_hashalloc(ip, cg, bpref, request, nsize, 0, ffs_alloccg);
bno = ffs_hashalloc(ip, cg, bpref, size, ffs_alloccg);
static daddr_t ffs_alloccg(struct inode *, int, daddr_t, int);