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From: Kanchan Joshi <[email protected]>
To: Jens Axboe <[email protected]>
Cc: [email protected], [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 22:37:07 +0530	[thread overview]
Message-ID: <20220805170707.GC17011@test-zns> (raw)
In-Reply-To: <[email protected]>

[-- Attachment #1: Type: text/plain, Size: 1202 bytes --]

On Fri, Aug 05, 2022 at 11:03:55AM -0600, Jens Axboe wrote:
>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);
>
>?
Damn, indeed. Would have caught if I had compiled this with
NVME_MULTIPATH config enabled. Thanks for the catch.

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  reply	other threads:[~2022-08-05 17:16 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
2022-08-05 17:07         ` Kanchan Joshi [this message]
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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