linux-kernel - Re: [PATCH] Add cmd_flags to print_req

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Date:   Tue, 30 Oct 2018 17:37:34 +0800
From:   Ming Lei <ming.lei@...hat.com>
To:     Balbir Singh <sblbir@...n.com>
Cc:     axboe@...nel.dk, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Add cmd_flags to print_req_error

On Tue, Oct 30, 2018 at 02:40:15AM +0000, Balbir Singh wrote:
> I ran into a bug where after hibernation due to incompatible
> backends, the block driver returned BLK_STS_NOTSUPP, with the
> current message it's hard to find out what the command flags
> were. Adding req->cmd_flags help make the problem easier to
> diagnose.
> 
> Signed-off-by: Balbir Singh <sblbir@...n.com>
> Reviewed-by: Eduardo Valentin <eduval@...zon.com>
> ---
> 
> Testing: Compile tested at my end
> 
> Changelog
>   - convert %llx to %x and remove casting to unsigned long long
> 
>  block/blk-core.c | 9 +++++----
>  1 file changed, 5 insertions(+), 4 deletions(-)
> 
> diff --git a/block/blk-core.c b/block/blk-core.c
> index cdfabc5646da..0fd6104bb0d2 100644
> --- a/block/blk-core.c
> +++ b/block/blk-core.c
> @@ -256,10 +256,11 @@ static void print_req_error(struct request *req, blk_status_t status)
>  	if (WARN_ON_ONCE(idx >= ARRAY_SIZE(blk_errors)))
>  		return;
>  
> -	printk_ratelimited(KERN_ERR "%s: %s error, dev %s, sector %llu\n",
> -			   __func__, blk_errors[idx].name, req->rq_disk ?
> -			   req->rq_disk->disk_name : "?",
> -			   (unsigned long long)blk_rq_pos(req));
> +	printk_ratelimited(KERN_ERR "%s: %s error, dev %s, sector %llu flags %x\n",
> +				__func__, blk_errors[idx].name,
> +				req->rq_disk ?  req->rq_disk->disk_name : "?",
> +				(unsigned long long)blk_rq_pos(req),
> +				req->cmd_flags);
>  }
>  
>  static void req_bio_endio(struct request *rq, struct bio *bio,
> -- 
> 2.16.2
> 

Looks fine:

Reviewed-by: Ming Lei <ming.lei@...hat.com>

-- 
Ming