Re: [PATCH v3 3/4] xfs: Use variable-size array for nameval in xfs_attr_sf_entry

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On Thu, Sep 03, 2020 at 04:28:38PM +0200, Carlos Maiolino wrote:
> nameval is a variable-size array, so, define it as it, and remove all
> the -1 magic number subtractions
> 
> Signed-off-by: Carlos Maiolino <cmaiolino@xxxxxxxxxx>
> ---
> 
> Changelog:
> 
> 	V2:
> 	 - Drop wrong change to XFS_ATTR_SF_ENTSIZE_MAX
> 	V3:
> 	- Use XFS_ATTR_SF_ENTSIZE_BYNAME in xfs_attr_shortform_allfit()
> 	- Remove int casting and fix spacing on
> 	  XFS_ATTR_SF_ENTSIZE_BYNAME
> 
>  fs/xfs/libxfs/xfs_attr_leaf.c | 10 ++++------
>  fs/xfs/libxfs/xfs_attr_sf.h   |  4 ++--
>  fs/xfs/libxfs/xfs_da_format.h |  2 +-
>  3 files changed, 7 insertions(+), 9 deletions(-)
> 
> diff --git a/fs/xfs/libxfs/xfs_attr_leaf.c b/fs/xfs/libxfs/xfs_attr_leaf.c
> index d920183b08a99..fb05c77fc8c9f 100644
> --- a/fs/xfs/libxfs/xfs_attr_leaf.c
> +++ b/fs/xfs/libxfs/xfs_attr_leaf.c
> @@ -992,9 +992,9 @@ xfs_attr_shortform_allfit(
>  			return 0;
>  		if (be16_to_cpu(name_loc->valuelen) >= XFS_ATTR_SF_ENTSIZE_MAX)
>  			return 0;
> -		bytes += sizeof(struct xfs_attr_sf_entry) - 1
> -				+ name_loc->namelen
> -				+ be16_to_cpu(name_loc->valuelen);
> +		bytes += XFS_ATTR_SF_ENTSIZE_BYNAME(
> +					name_loc->namelen,
> +					be16_to_cpu(name_loc->valuelen));

This can be:

		bytes += XFS_ATTR_SF_ENTSIZE_BYNAME(name_loc->namelen,
					be16_to_cpu(name_loc->valuelen));

and would be way more readable that way.

Otherwise looks good:

Reviewed-by: Christoph Hellwig <hch@xxxxxx>



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