> --- a/fs/xfs/libxfs/xfs_format.h
> +++ b/fs/xfs/libxfs/xfs_format.h
> @@ -1540,6 +1540,7 @@ typedef struct xfs_bmdr_block {
> #define BMBT_BLOCKCOUNT_BITLEN 21
>
> #define BMBT_STARTOFF_MASK ((1ULL << BMBT_STARTOFF_BITLEN) - 1)
> +#define XFS_MAX_FILEOFF (BMBT_STARTOFF_MASK)
I think throwing in a comment here would be useful.
Otherwise the patch looks good to me.
