Re: [PATCH 3/3] xfs: remove unnecessary shifts

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On Mon, May 31, 2021 at 03:40:49PM -0700, Darrick J. Wong wrote:
> From: Darrick J. Wong <djwong@xxxxxxxxxx>
> 
> The superblock verifier already validates that (1 << blocklog) ==
> blocksize, so use the value directly instead of doing math.
> 
> Signed-off-by: Darrick J. Wong <djwong@xxxxxxxxxx>

Looks good.

Reviewed-by: Carlos Maiolino <cmaiolino@xxxxxxxxxx>

> ---
>  fs/xfs/xfs_bmap_util.c |    6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> 
> diff --git a/fs/xfs/xfs_bmap_util.c b/fs/xfs/xfs_bmap_util.c
> index 0936f3a96fe6..997eb5c6e9b4 100644
> --- a/fs/xfs/xfs_bmap_util.c
> +++ b/fs/xfs/xfs_bmap_util.c
> @@ -945,7 +945,7 @@ xfs_flush_unmap_range(
>  	xfs_off_t		rounding, start, end;
>  	int			error;
>  
> -	rounding = max_t(xfs_off_t, 1 << mp->m_sb.sb_blocklog, PAGE_SIZE);
> +	rounding = max_t(xfs_off_t, mp->m_sb.sb_blocksize, PAGE_SIZE);
>  	start = round_down(offset, rounding);
>  	end = round_up(offset + len, rounding) - 1;
>  
> @@ -1053,9 +1053,9 @@ xfs_prepare_shift(
>  	 * extent (after split) during the shift and corrupt the file. Start
>  	 * with the block just prior to the start to stabilize the boundary.
>  	 */
> -	offset = round_down(offset, 1 << mp->m_sb.sb_blocklog);
> +	offset = round_down(offset, mp->m_sb.sb_blocksize);
>  	if (offset)
> -		offset -= (1 << mp->m_sb.sb_blocklog);
> +		offset -= mp->m_sb.sb_blocksize;
>  
>  	/*
>  	 * Writeback and invalidate cache for the remainder of the file as we're
> 

-- 
Carlos




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