linux-kernel - Re: [PATCH 10/13] xfs: convert buftarg LRU to generic code

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Date:	Wed, 24 Aug 2011 02:27:06 -0400
From:	Christoph Hellwig <hch@...radead.org>
To:	Dave Chinner <david@...morbit.com>
Cc:	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	linux-mm@...ck.org, khlebnikov@...nvz.org
Subject: Re: [PATCH 10/13] xfs: convert buftarg LRU to generic code

> -STATIC void
> +static inline void
>  xfs_buf_lru_add(
>  	struct xfs_buf	*bp)
>  {
> -	struct xfs_buftarg *btp = bp->b_target;
> -
> -	spin_lock(&btp->bt_lru_lock);
> -	if (list_empty(&bp->b_lru)) {
> +	if (list_lru_add(&bp->b_target->bt_lru, &bp->b_lru))
>  		atomic_inc(&bp->b_hold);
> -		list_add_tail(&bp->b_lru, &btp->bt_lru);
> -		btp->bt_lru_nr++;
> -	}
> -	spin_unlock(&btp->bt_lru_lock);
>  }

Is there any point in keeping this wrapper?

> +static inline void
>  xfs_buf_lru_del(
>  	struct xfs_buf	*bp)
>  {
>  	if (list_empty(&bp->b_lru))
>  		return;
>  
> +	list_lru_del(&bp->b_target->bt_lru, &bp->b_lru);
>  }

It seems like all callers of list_lru_del really want the unlocked
check.  Out of your current set only two of the inode.c callers
are missing it, but given that those set I_FREEING first they should
be safe to do it as well.  What do you think about pulling
the unlocked check into list_lru_del?

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