linux-kernel - Re: [PATCH] nvme: make controller 'state' sysfs attribute pollable

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Message-ID: <20170925125211.GD8130@lst.de>
Date:   Mon, 25 Sep 2017 14:52:11 +0200
From:   Christoph Hellwig <hch@....de>
To:     Hannes Reinecke <hare@...e.de>
Cc:     Sagi Grimberg <sagi@...mberg.me>,
        Johannes Thumshirn <jthumshirn@...e.de>,
        Christoph Hellwig <hch@....de>,
        Keith Busch <keith.busch@...el.com>,
        Linux NVMe Mailinglist <linux-nvme@...ts.infradead.org>,
        Linux Kernel Mailinglist <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] nvme: make controller 'state' sysfs attribute pollable

On Mon, Sep 25, 2017 at 10:23:16AM +0200, Hannes Reinecke wrote:
> > We could have such an interface I assume. But it would suck to maintain
> > yet another state (we are already having enough trouble to have a
> > coherent controller state machine).
> 
> Weell ... we could be using a notifier chain for that.
> I think I should post my patchset.

The point is: if you want proper multipath behavior use the nvme
in-kernel multipath code.  If you want to weird crap in userspace don't
expect any help from the kernel driver.