xfs_dir2_data_hdr_t
xfs.blkoff = sizeof(xfs_dir2_data_hdr_t);
xfs_read (dirbuf, sizeof(xfs_dir2_data_hdr_t));
if (((xfs_dir2_data_hdr_t *)dirbuf)->magic == le32(XFS_DIR2_BLOCK_MAGIC)) {
xfs.blkoff = sizeof(xfs_dir2_data_hdr_t);