[PATCH 3/4] xfs: simplify xfs_ail_max

[Mark Tinguely]

On 12/24/13 06:48, Jeff Liu wrote:
> From: Jie Liu<jeff.liu at oracle.com>
>
> We have already simplified xfs_ail_min() with a new list helper, i.e,
> list_first_entry_or_null(), but xfs_ail_max() still remains as same
> as there is no corresponding list helper we can use for now.  It's
> fairly easy to simulate the list behavior of getting the last item
> in the AIL, therefore we can simplify xfs_ail_max() and move it to
> the header file to make this pair of AIL routines looks symmetrical.
>
> Signed-off-by: Jie Liu<jeff.liu at oracle.com>
> ---

> +/*
> + * Return a pointer to the last item in the AIL.  If the AIL is empty, then
> + * return NULL.
> + */
> +static inline struct xfs_log_item *
> +xfs_ail_max(
> +	struct xfs_ail  *ailp)
> +{
> +	return list_empty(&ailp->xa_ail) ? NULL :
> +		list_last_entry(&ailp->xa_ail, struct xfs_log_item, li_ail);
> +}
> +
> +
>   static inline void
>   xfs_trans_ail_update(
>   	struct xfs_ail		*ailp,

Looks good.

Reviewed-by: Mark Tinguely <tinguely at sgi.com>