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From: Jens Axboe <[email protected]>
To: Kanchan Joshi <[email protected]>, [email protected]
Cc: [email protected], [email protected],
	[email protected], [email protected],
	[email protected], [email protected],
	Anuj Gupta <[email protected]>
Subject: Re: [PATCH 4/4] nvme: wire up async polling for io passthrough commands
Date: Fri, 5 Aug 2022 11:03:55 -0600	[thread overview]
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>

On 8/5/22 9:42 AM, Kanchan Joshi wrote:
> @@ -685,6 +721,29 @@ int nvme_ns_head_chr_uring_cmd(struct io_uring_cmd *ioucmd,
>  	srcu_read_unlock(&head->srcu, srcu_idx);
>  	return ret;
>  }
> +
> +int nvme_ns_head_chr_uring_cmd_iopoll(struct io_uring_cmd *ioucmd)
> +{
> +	struct cdev *cdev = file_inode(ioucmd->file)->i_cdev;
> +	struct nvme_ns_head *head = container_of(cdev, struct nvme_ns_head, cdev);
> +	int srcu_idx = srcu_read_lock(&head->srcu);
> +	struct nvme_ns *ns = nvme_find_path(head);
> +	struct bio *bio;
> +	int ret = 0;
> +	struct request_queue *q;
> +
> +	if (ns) {
> +		rcu_read_lock();
> +		bio = READ_ONCE(ioucmd->private);
> +		q = ns->queue;
> +		if (test_bit(QUEUE_FLAG_POLL, &q->queue_flags) && bio
> +				&& bio->bi_bdev)
> +			ret = bio_poll(bio, 0, 0);
> +		rcu_read_unlock();
> +	}
> +	srcu_read_unlock(&head->srcu, srcu_idx);
> +	return ret;
> +}
>  #endif /* CONFIG_NVME_MULTIPATH */

Looks like that READ_ONCE() should be:

	bio = READ_ONCE(ioucmd->cookie);

?

-- 
Jens Axboe


  reply	other threads:[~2022-08-05 17:04 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <CGME20220805155300epcas5p1b98722e20990d0095238964e2be9db34@epcas5p1.samsung.com>
2022-08-05 15:42 ` [PATCH 0/4] iopoll support for io_uring/nvme passthrough Kanchan Joshi
     [not found]   ` <CGME20220805155304epcas5p1bb687a8f9b25317af39def01696626e8@epcas5p1.samsung.com>
2022-08-05 15:42     ` [PATCH 1/4] fs: add file_operations->uring_cmd_iopoll Kanchan Joshi
     [not found]   ` <CGME20220805155307epcas5p4bab3f05dc13d8fc2f03c7a26e9bd8c7c@epcas5p4.samsung.com>
2022-08-05 15:42     ` [PATCH 2/4] io_uring: add iopoll infrastructure for io_uring_cmd Kanchan Joshi
     [not found]   ` <CGME20220805155310epcas5p2bd7ec5b9bee73893958f4bc84038eca0@epcas5p2.samsung.com>
2022-08-05 15:42     ` [PATCH 3/4] block: export blk_rq_is_poll Kanchan Joshi
     [not found]   ` <CGME20220805155313epcas5p2d35d22831bd07ef33fbdc28bd99ae1d0@epcas5p2.samsung.com>
2022-08-05 15:42     ` [PATCH 4/4] nvme: wire up async polling for io passthrough commands Kanchan Joshi
2022-08-05 17:03       ` Jens Axboe [this message]
2022-08-05 17:07         ` Kanchan Joshi
2022-08-05 21:22       ` kernel test robot
2022-08-06  0:06       ` kernel test robot
2022-08-06  1:38       ` kernel test robot
2022-08-07 12:25       ` kernel test robot
2022-08-05 17:04   ` [PATCH 0/4] iopoll support for io_uring/nvme passthrough Jens Axboe
2022-08-05 17:13     ` Kanchan Joshi
2022-08-05 17:27       ` Jens Axboe
2022-08-05 17:18     ` Jens Axboe
2022-08-05 18:11       ` Keith Busch
2022-08-05 18:15         ` Jens Axboe
2022-08-07 17:58           ` Kanchan Joshi
2022-08-07 18:46             ` Jens Axboe
2022-08-05 18:21       ` Jens Axboe

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