gfs2_diradd_alloc_required
int gfs2_diradd_alloc_required(struct inode *dir,
error = gfs2_diradd_alloc_required(dir, &dentry->d_name, &da);
error = gfs2_diradd_alloc_required(ndir, &ndentry->d_name, &da);
error = gfs2_diradd_alloc_required(dir, name, &da);