Re: [PATCH 14/16] block: switch polling to be bio based

To: Christoph Hellwig <hch@xxxxxx>
Subject: Re: [PATCH 14/16] block: switch polling to be bio based
From: "chenxiang (M)" <chenxiang66@xxxxxxxxxxxxx>
Date: Wed, 3 Nov 2021 16:05:41 +0800
Cc: Jens Axboe <axboe@xxxxxxxxx>, Jeffle Xu <jefflexu@xxxxxxxxxxxxxxxxx>, Ming Lei <ming.lei@xxxxxxxxxx>, Damien Le Moal <Damien.LeMoal@xxxxxxx>, Keith Busch <kbusch@xxxxxxxxxx>, Sagi Grimberg <sagi@xxxxxxxxxxx>, "Wunderlich, Mark" <mark.wunderlich@xxxxxxxxx>, "Vasudevan, Anil" <anil.vasudevan@xxxxxxxxx>, <linux-block@xxxxxxxxxxxxxxx>, <linux-fsdevel@xxxxxxxxxxxxxxx>, <linux-nvme@xxxxxxxxxxxxxxxxxxx>
In-reply-to: <20211103072223.GB31003@lst.de>
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在 2021/11/3 15:22, Christoph Hellwig 写道:

On Wed, Nov 03, 2021 at 03:11:25PM +0800, chenxiang (M) wrote:

For some scsi command sent by function __scsi_execute() without data, it
has request but no bio (bufflen = 0),
then how to use bio_poll() for them ?

You can't send these requests as polled.  Note that these are passthrough
requests only.


Understood, thanks.

References:
- switch block layer polling to a bio based model v4
  - From: Christoph Hellwig
- [PATCH 14/16] block: switch polling to be bio based
  - From: Christoph Hellwig
- Re: [PATCH 14/16] block: switch polling to be bio based
  - From: chenxiang (M)
- Re: [PATCH 14/16] block: switch polling to be bio based
  - From: Christoph Hellwig