Re: [PATCH 20/31] xfs: open code ATTR_ENTSIZE

["Darrick J. Wong" <darrick.wong@oracle.com>]

On Fri, Feb 21, 2020 at 06:11:43AM -0800, Christoph Hellwig wrote:
> Replace a single use macro containing open-coded variants of
> standard helpers with direct calls to the standard helpers.
> 
> Signed-off-by: Christoph Hellwig <hch@lst.de>
> Reviewed-by: Dave Chinner <dchinner@redhat.com>
> Reviewed-by: Chandan Rajendra <chandanrlinux@gmail.com>

Yay less macro,
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>

--D

> ---
>  fs/xfs/xfs_attr_list.c | 11 ++++-------
>  1 file changed, 4 insertions(+), 7 deletions(-)
> 
> diff --git a/fs/xfs/xfs_attr_list.c b/fs/xfs/xfs_attr_list.c
> index 0fe12474a952..c97e6806cf1f 100644
> --- a/fs/xfs/xfs_attr_list.c
> +++ b/fs/xfs/xfs_attr_list.c
> @@ -545,12 +545,6 @@ xfs_attr_list_int(
>  	return error;
>  }
>  
> -#define	ATTR_ENTBASESIZE		/* minimum bytes used by an attr */ \
> -	(((struct attrlist_ent *) 0)->a_name - (char *) 0)
> -#define	ATTR_ENTSIZE(namelen)		/* actual bytes used by an attr */ \
> -	((ATTR_ENTBASESIZE + (namelen) + 1 + sizeof(uint32_t)-1) \
> -	 & ~(sizeof(uint32_t)-1))
> -
>  /*
>   * Format an attribute and copy it out to the user's buffer.
>   * Take care to check values and protect against them changing later,
> @@ -586,7 +580,10 @@ xfs_attr_put_listent(
>  
>  	arraytop = sizeof(*alist) +
>  			context->count * sizeof(alist->al_offset[0]);
> -	context->firstu -= ATTR_ENTSIZE(namelen);
> +
> +	/* decrement by the actual bytes used by the attr */
> +	context->firstu -= round_up(offsetof(struct attrlist_ent, a_name) +
> +			namelen + 1, sizeof(uint32_t));
>  	if (context->firstu < arraytop) {
>  		trace_xfs_attr_list_full(context);
>  		alist->al_more = 1;
> -- 
> 2.24.1
>