xfs_dir3_data_hdr
#define XFS_DIR3_DATA_CRC_OFF offsetof(struct xfs_dir3_data_hdr, hdr.crc)
sizeof(struct xfs_dir3_data_hdr);
return ((struct xfs_dir3_data_hdr *)hdr)->best_free;
struct xfs_dir3_data_hdr *hdr3 = bp->b_addr;
XFS_CHECK_OFFSET(struct xfs_dir3_data_hdr, hdr.magic, 0);
XFS_CHECK_STRUCT_SIZE(struct xfs_dir3_data_hdr, 64);