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From: Keith Busch <kbusch@kernel.org>
To: Casey Chen <cachen@purestorage.com>
Cc: axboe@kernel.dk, hch@lst.de, linux-block@vger.kernel.org,
	linux-nvme@lists.infradead.org, sagi@grimberg.me,
	yzhong@purestorage.com
Subject: Re: [PATCH 2/2] nvme: use return value from blk_execute_rq()
Date: Sat, 17 Apr 2021 11:39:29 +0900
Message-ID: <20210417023929.GD32082@redsun51.ssa.fujisawa.hgst.com> (raw)
In-Reply-To: <CALCePG0y1REA8xXX1ymTwAZhrbSyUh41zfpOmFQViuyPGf5ePg@mail.gmail.com>

On Fri, Apr 16, 2021 at 07:04:34PM -0700, Casey Chen wrote:
> > On Fri, Apr 16, 2021 at 10:12:11AM -0700, Yuanyuan Zhong wrote:
> > > >         if (poll)
> > > >                 nvme_execute_rq_polled(req->q, NULL, req, at_head);
> > > You may need to audit other completion handlers for blk_execute_rq_nowait().
> >
> > Why? Those callers already provide their own callback that directly get
> > the error.
> 
> We should make sure all callbacks provided to blk_execute_rq_nowait()
> carry error back. i.e. by reusing rq->end_io_data.
>
> > > How to get error ret from polled rq?
> >
> > Please see nvme_end_sync_rq() for that driver's polled handler callback.
> > It already has the error.
> 
> nvme_end_sync_rq() currently doesn't store error in rq->end_io_data as
> you proposed in patch 1.

The question was how the error gets back to the caller, and they already
have it.

Patch 1 is specific to the sync execution. All the async users' handling
of the provided error are implementation specific. If they're not using
it correctly, then they can be fixed too.

  reply index

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-17  2:04 Casey Chen
2021-04-17  2:39 ` Keith Busch [this message]
  -- strict thread matches above, loose matches on Subject: below --
2021-04-23 21:57 [PATCH 1/2] block: return errors " Keith Busch
2021-04-23 21:58 ` [PATCH 2/2] nvme: use return value " Keith Busch
2021-04-16 16:53 [PATCH 1/2] block: return errors " Keith Busch
2021-04-16 16:53 ` [PATCH 2/2] nvme: use return value " Keith Busch
2021-04-16 17:12   ` Yuanyuan Zhong
2021-04-16 17:17     ` Keith Busch
2021-04-19  7:16       ` Christoph Hellwig
2021-04-19 15:14         ` Keith Busch
2021-04-19 17:27           ` Yuanyuan Zhong
2021-04-19 17:48             ` Keith Busch
2021-04-19 18:20               ` Yuanyuan Zhong
2021-04-18  4:17   ` Chaitanya Kulkarni

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