linux-kernel - Re: [PATCH v2] lightnvm: fix rrpc_lun

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Date:	Mon, 4 Jan 2016 11:18:03 +0100
From:	Matias Bjørling <mb@...htnvm.io>
To:	Wenwei Tao <ww.tao0320@...il.com>
Cc:	linux-kernel@...r.kernel.org, linux-block@...r.kernel.org
Subject: Re: [PATCH v2] lightnvm: fix rrpc_lun_gc

On 12/31/2015 05:40 AM, Wenwei Tao wrote:
> This patch fix two issues in rrpc_lun_gc
>
> 1. prio_list is protected by rrpc_lun's lock not nvm_lun's, so
> acquire rlun's lock instead of lun's before operate on the list.
>
> 2. we delete block from prio_list before allocating gcb, but gcb
> allocation may fail, we end without putting it back to the list,
> this makes the block won't get reclaimed in the future. To solve
> this issue, delete block after gcb allocation.
>
> Signed-off-by: Wenwei Tao <ww.tao0320@...il.com>
> ---
>
> Changed in v2:
>   -Advance the gcb allocation, make the debug log deliver
> the correct message.
>
>   drivers/lightnvm/rrpc.c | 12 ++++++------
>   1 file changed, 6 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/lightnvm/rrpc.c b/drivers/lightnvm/rrpc.c
> index 67b14d4..40b0309 100644
> --- a/drivers/lightnvm/rrpc.c
> +++ b/drivers/lightnvm/rrpc.c
> @@ -443,7 +443,7 @@ static void rrpc_lun_gc(struct work_struct *work)
>   	if (nr_blocks_need < rrpc->nr_luns)
>   		nr_blocks_need = rrpc->nr_luns;
>
> -	spin_lock(&lun->lock);
> +	spin_lock(&rlun->lock);
>   	while (nr_blocks_need > lun->nr_free_blocks &&
>   					!list_empty(&rlun->prio_list)) {
>   		struct rrpc_block *rblock = block_prio_find_max(rlun);
> @@ -452,16 +452,16 @@ static void rrpc_lun_gc(struct work_struct *work)
>   		if (!rblock->nr_invalid_pages)
>   			break;
>
> +		gcb = mempool_alloc(rrpc->gcb_pool, GFP_ATOMIC);
> +		if (!gcb)
> +			break;
> +
>   		list_del_init(&rblock->prio);
>
>   		BUG_ON(!block_is_full(rrpc, rblock));
>
>   		pr_debug("rrpc: selected block '%lu' for GC\n", block->id);
>
> -		gcb = mempool_alloc(rrpc->gcb_pool, GFP_ATOMIC);
> -		if (!gcb)
> -			break;
> -
>   		gcb->rrpc = rrpc;
>   		gcb->rblk = rblock;
>   		INIT_WORK(&gcb->ws_gc, rrpc_block_gc);
> @@ -470,7 +470,7 @@ static void rrpc_lun_gc(struct work_struct *work)
>
>   		nr_blocks_need--;
>   	}
> -	spin_unlock(&lun->lock);
> +	spin_unlock(&rlun->lock);
>
>   	/* TODO: Hint that request queue can be started again */
>   }
>
Thanks, applied for 4.5. I've changed the title a bit.
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