linux-kernel - Re: nvme: allow ANA support to be independent of native multipathing

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Message-ID: <20181119093938.GA11757@lst.de>
Date:   Mon, 19 Nov 2018 10:39:38 +0100
From:   Christoph Hellwig <hch@....de>
To:     Mike Snitzer <snitzer@...hat.com>
Cc:     Christoph Hellwig <hch@....de>, Hannes Reinecke <hare@...e.de>,
        linux-nvme@...ts.infradead.org,
        Keith Busch <keith.busch@...el.com>,
        Sagi Grimberg <sagi@...mberg.me>, axboe@...nel.dk,
        Martin Wilck <mwilck@...e.com>, lijie <lijie34@...wei.com>,
        xose.vazquez@...il.com, chengjike.cheng@...wei.com,
        shenhong09@...wei.com, dm-devel@...hat.com,
        wangzhoumengjian@...wei.com, christophe.varoqui@...nsvc.com,
        bmarzins@...hat.com, sschremm@...app.com,
        linux-block@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: nvme: allow ANA support to be independent of native
 multipathing

On Fri, Nov 16, 2018 at 02:28:02PM -0500, Mike Snitzer wrote:
> You rejected the idea of allowing fine-grained control over whether
> native NVMe multipathing is enabled or not on a per-namespace basis.
> All we have is the coarse-grained nvme_core.multipath=N knob.  Now
> you're forecasting removing even that.  Please don't do that.

The whole point is that this hook was intended as a band aid for the
hypothetical pre-existing setups.  Not ever for new development.

> Please, PLEASE take v2 of this patch.. please? ;)

See the previous mail for the plan ahead.   I'm sick and tired of you
trying to sneak your new developemts back in.