linux-kernel - Re: [PATCH v4 1/2] nvme: cache struct nvme_ctrl reference to struct nvme

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Date:   Wed, 27 Jun 2018 09:35:11 +0200
From:   Johannes Thumshirn <jthumshirn@...e.de>
To:     Keith Busch <keith.busch@...ux.intel.com>
Cc:     Keith Busch <keith.busch@...el.com>,
        Linux Kernel Mailinglist <linux-kernel@...r.kernel.org>,
        Christoph Hellwig <hch@....de>,
        Linux NVMe Mailinglist <linux-nvme@...ts.infradead.org>,
        Sagi Grimberg <sagi@...mberg.me>
Subject: Re: [PATCH v4 1/2] nvme: cache struct nvme_ctrl reference to struct
 nvme_request

On Tue, Jun 26, 2018 at 08:55:32AM -0600, Keith Busch wrote:
> On Tue, Jun 26, 2018 at 03:51:40PM +0200, Johannes Thumshirn wrote:
> > @@ -652,6 +653,7 @@ blk_status_t nvme_setup_cmd(struct nvme_ns *ns, struct request *req,
> >  	}
> >  
> >  	cmd->common.command_id = req->tag;
> > +	nvme_req(req)->ctrl = ctrl;
> >  	if (ns)
> >  		trace_nvme_setup_nvm_cmd(req->q->id, cmd);
> >  	else
> 
> I don't think we need to do this per-io. The request coming from the
> controller's tagset, so we can do this just once at .init_request time,
> right?

Agreed, but as it's Sagi's patch I'd like to hear his opinion on this
before changing it.

Byte,
       Johannes
-- 
Johannes Thumshirn                                          Storage
jthumshirn@...e.de                                +49 911 74053 689
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