linux-kernel - Re: [PATCH v3 3/8] nvmet: implement namespace identify descriptor list

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Date:   Sat, 3 Jun 2017 11:03:06 +0300
From:   Sagi Grimberg <sagi@...mberg.me>
To:     Christoph Hellwig <hch@....de>
Cc:     Johannes Thumshirn <jthumshirn@...e.de>,
        Keith Busch <keith.busch@...el.com>,
        Hannes Reinecke <hare@...e.de>, maxg@...lanox.com,
        Linux NVMe Mailinglist <linux-nvme@...ts.infradead.org>,
        Linux Kernel Mailinglist <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 3/8] nvmet: implement namespace identify descriptor
 list


>>>   	switch (type) {
>>>   	case NVME_NQN_NVME:
>>> diff --git a/drivers/nvme/target/nvmet.h b/drivers/nvme/target/nvmet.h
>>> index cfc5c7fb0ab7..4c6cb5ea1186 100644
>>> --- a/drivers/nvme/target/nvmet.h
>>> +++ b/drivers/nvme/target/nvmet.h
>>> @@ -46,6 +46,7 @@ struct nvmet_ns {
>>>   	u32			blksize_shift;
>>>   	loff_t			size;
>>>   	u8			nguid[16];
>>> +	uuid_be			uuid;
>>
>> This should be uuid_le to match the rest of NVMe.
> 
> It shouldn't.  A RFC4122 uuid is always in "big endian" notation.
> A little endiane uuid doesn't exist, it's called a GUID in Wintel
> speak and isn't used in NVMe.  My new uuid tree tries to fix up
> the confusion by renaming our uuid_be type to uuid_t and uuid_le
> to guid_t.

Thanks for clarifying.

At one point we had a uuid before we allowed user-space to pass a nguid
and it was little endian, but it was a hack anyway.