linux-kernel - Re: [PATCH] nvme: duplicate NQNs check if devices needed

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Date:   Tue, 30 Nov 2021 07:40:54 +0100
From:   Christoph Hellwig <hch@....de>
To:     luanshi <zhangliguang@...ux.alibaba.com>
Cc:     Keith Busch <kbusch@...nel.org>, Jens Axboe <axboe@...com>,
        Christoph Hellwig <hch@....de>,
        Sagi Grimberg <sagi@...mberg.me>,
        linux-nvme@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] nvme: duplicate NQNs check if devices needed

On Tue, Nov 30, 2021 at 01:04:55PM +0800, luanshi wrote:
> Hi Keith,
>
> 在 2021/11/30 0:34, Keith Busch 写道:
>> On Mon, Nov 29, 2021 at 07:18:54PM +0800, Liguang Zhang wrote:
>>> @@ -2587,6 +2587,9 @@ static struct nvme_subsystem *__nvme_find_get_subsystem(const char *subsysnqn)
>>>     	lockdep_assert_held(&nvme_subsystems_lock);
>>>   +	if (strncmp(subsysnqn, "nqn.", 4))
>>> +		return NULL;
>> This seems like an arbitrary way to decide not to check for duplicates.
>> Shouldn't we just add the NVME_QUIRK_IGNORE_DEV_SUBNQN quirk for the
>> broken controllers?
>
> Yeah, add the NVME_QUIRK_IGNORE_DEV_SUBNQN quirk is a way to resolve the 
> problem. I do not
>
> have enough controller in my hand, I don't make sure all the controller are 
> covered. And there are some

What does this broken device report in the subnqn field?