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From: Christoph Hellwig <hch@lst.de>
To: Keith Busch <kbusch@kernel.org>
Cc: linux-nvme@lists.infradead.org, sagi@grimberg.me, hch@lst.de,
	axboe@kernel.dk, linux-block@vger.kernel.org,
	Yuanyuan Zhong <yzhong@purestorage.com>,
	Casey Chen <cachen@purestorage.com>
Subject: Re: [PATCH 1/2] block: return errors from blk_execute_rq()
Date: Mon, 26 Apr 2021 16:31:46 +0200
Message-ID: <20210426143146.GB19408@lst.de> (raw)
In-Reply-To: <20210423215800.40648-1-kbusch@kernel.org>

On Fri, Apr 23, 2021 at 02:57:59PM -0700, Keith Busch wrote:
> The synchronous blk_execute_rq() had not provided a way for its callers
> to know if its request was successful or not. Return the errno from the
> completion status.
> 
> Reported-by: Yuanyuan Zhong <yzhong@purestorage.com>
> Signed-off-by: Keith Busch <kbusch@kernel.org>
> ---
>  block/blk-exec.c       | 6 ++++--
>  include/linux/blkdev.h | 2 +-
>  2 files changed, 5 insertions(+), 3 deletions(-)
> 
> diff --git a/block/blk-exec.c b/block/blk-exec.c
> index beae70a0e5e5..3877a2677dd4 100644
> --- a/block/blk-exec.c
> +++ b/block/blk-exec.c
> @@ -21,7 +21,7 @@ static void blk_end_sync_rq(struct request *rq, blk_status_t error)
>  {
>  	struct completion *waiting = rq->end_io_data;
>  
> -	rq->end_io_data = NULL;
> +	rq->end_io_data = ERR_PTR(blk_status_to_errno(error));

I think we should propagate the blk_status_t here as we're entirely inside
the block layer.  I.e. declare a blk_status_t on-stack in blk_execute_rq
and pass a pointer to it in ->end_io_data.

> -extern void blk_execute_rq(struct gendisk *, struct request *, int);
> +extern int blk_execute_rq(struct gendisk *, struct request *, int);

It would be nice to drop the extern here and spell out the argument
names.

  parent reply index

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-23 21:57 Keith Busch
2021-04-23 21:58 ` [PATCH 2/2] nvme: use return value " Keith Busch
2021-04-23 22:04 ` [PATCH 1/2] block: return errors " Keith Busch
2021-04-26 14:31 ` Christoph Hellwig [this message]
  -- strict thread matches above, loose matches on Subject: below --
2021-04-16 16:53 Keith Busch
2021-04-18  4:13 ` Chaitanya Kulkarni

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