linux-kernel - Re: [PATCH 2/3] lightnvm: do no update csecs and sos on 1.2

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Date:   Tue, 18 Sep 2018 10:37:04 +0200
From:   Matias Bjørling <mb@...htnvm.io>
To:     javier@...xlabs.com
Cc:     igor.j.konopko@...el.com, marcin.dziegielewski@...el.com,
        linux-block@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/3] lightnvm: do no update csecs and sos on 1.2

On 09/11/2018 01:30 PM, Javier Gonzalez wrote:
>> On 11 Sep 2018, at 10.50, Javier Gonzalez <javier@...xlabs.com> wrote:
>>
>>> On 7 Sep 2018, at 12.28, Matias Bjørling <mb@...htnvm.io> wrote:
>>>
>>> On 08/29/2018 12:09 PM, Javier González wrote:
>>>> In the OCSSD 2.0 spec., the sector and metadata sizes are reported though
>>>> the standard nvme identify command. Thus, the lightnvm subsystem needs
>>>> to update this information on the geometry structure on bootup.
>>>> Since 1.2 devices report these values on the OCSSD geometry identify,
>>>> avoid this update is it is unnecessary and can also corrupt the geometry
>>>> if the devices does not report the nvme sizes correctly (which is not
>>>> required by the OCSSD 1.2 spec either) >
>>>> Signed-off-by: Javier González <javier@...xlabs.com>
>>>> ---
>>>> drivers/nvme/host/lightnvm.c | 3 +++
>>>> 1 file changed, 3 insertions(+)
>>>> diff --git a/drivers/nvme/host/lightnvm.c b/drivers/nvme/host/lightnvm.c
>>>> index 5bfa354c5dd5..33ed09f8410e 100644
>>>> --- a/drivers/nvme/host/lightnvm.c
>>>> +++ b/drivers/nvme/host/lightnvm.c
>>>> @@ -980,6 +980,9 @@ void nvme_nvm_update_nvm_info(struct nvme_ns *ns)
>>>> 	struct nvm_dev *ndev = ns->ndev;
>>>> 	struct nvm_geo *geo = &ndev->geo;
>>>> +	if (geo->version == NVM_OCSSD_SPEC_12)
>>>> +		return;
>>>
>>> The lba format sizes are not explicit in 2.0 either. For a conforming drive, it should implement the NVM Command Set and expose the LBA format correctly. Although, I do get your incentive, and if it is okay with you, I'll reword the commit message to this and apply it?:
>>>
>>> "1.2 devices exposes their data and metadata size through the separate
>>> identify command. Make sure that the NVMe LBA format does not override
>>> these values."
>>
>> Sounds good. I'll resend either way as I rebased on top of for-4.20/core
>> - you can change the commit as you think it suits.
> 
> Since Igor will send a patch for the OOB, can you pick this up
> separately? No changes needed after rebase.
> 
> Thanks,
> Javier
> 

Applied for 4.20.