ffs_alloccgblk
ffs_alloccgblk(struct inode *, struct buf *, ufs2_daddr_t, int);
blkno = ffs_alloccgblk(ip, bp, bpref, rsize);
blkno = ffs_alloccgblk(ip, bp, bpref, rsize);
if (ffs_alloccgblk(ip, bp, bno + i, fs->fs_bsize) != bno + i)
bno = ffs_alloccgblk(ip, bp, bpref);
bno = ffs_alloccgblk(ip, bp, bpref);
static daddr_t ffs_alloccgblk(struct inode *, struct m_buf *, daddr_t);