linux-kernel - Re: [PATCH 0/3] Provide more fine grained control over multipathing

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Message-ID: <20180531163440.GB30954@lst.de>
Date:   Thu, 31 May 2018 18:34:40 +0200
From:   Christoph Hellwig <hch@....de>
To:     Mike Snitzer <snitzer@...hat.com>
Cc:     Sagi Grimberg <sagi@...mberg.me>, Christoph Hellwig <hch@....de>,
        Johannes Thumshirn <jthumshirn@...e.de>,
        Keith Busch <keith.busch@...el.com>,
        Hannes Reinecke <hare@...e.de>,
        Laurence Oberman <loberman@...hat.com>,
        Ewan Milne <emilne@...hat.com>,
        James Smart <james.smart@...adcom.com>,
        Linux Kernel Mailinglist <linux-kernel@...r.kernel.org>,
        Linux NVMe Mailinglist <linux-nvme@...ts.infradead.org>,
        "Martin K . Petersen" <martin.petersen@...cle.com>,
        Martin George <marting@...app.com>,
        John Meneghini <John.Meneghini@...app.com>
Subject: Re: [PATCH 0/3] Provide more fine grained control over multipathing

On Thu, May 31, 2018 at 08:37:39AM -0400, Mike Snitzer wrote:
> I saw your reply to the 1/3 patch.. I do agree it is broken for not
> checking if any handles are active.  But that is easily fixed no?

Doing a switch at runtime simply is a really bad idea.  If for some
reason we end up with a good per-controller switch it would have
to be something set at probe time, and to get it on a controller
you'd need to reset it first.