linux-kernel - Re: linux-next: build failure after merge of the block tree

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Message-ID: <566010EE.6050806@bjorling.me>
Date:	Thu, 3 Dec 2015 10:52:46 +0100
From:	Matias Bjørling <m@...rling.me>
To:	Christoph Hellwig <hch@....de>
Cc:	Jens Axboe <axboe@...nel.dk>, Mark Brown <broonie@...nel.org>,
	Keith Busch <keith.busch@...el.com>,
	linux-next@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-block@...r.kernel.org
Subject: Re: linux-next: build failure after merge of the block tree

On 12/03/2015 10:06 AM, Christoph Hellwig wrote:
> On Thu, Dec 03, 2015 at 09:39:01AM +0100, Matias Bjørling wrote:
>> A little crazy yes. The reason is that the NVMe admin queues and NVMe user
>> queues are driven by different request queues. Previously this was patched
>> up with having two queues in the lightnvm core. One for admin and another
>> for user. But was later merged into a single queue.
>
> Why?  If you look at the current structure we have the admin queue
> which is always allocated by the Low level driver, although it could and
> should move to the core eventually.  And then we have Command set specific
> request_queues for the I/O queues.  One per NS for NVM currenly, either
> one per NS or one globally for LightNVM, and in Fabrics I currently
> have another magic one :)  Due to the tagset pointer in struct nvme_ctrl
> that's really easy to handle.
>

The identify geometry command and bad block commands are part of the 
admin command set. Surely, as all these take a ns id, they can be moved 
and be accessed naturally through the user queues.

Let me send out a revert for that patch.
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