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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20181116101752.GA21531@lst.de>
Date:   Fri, 16 Nov 2018 11:17:52 +0100
From:   Christoph Hellwig <hch@....de>
To:     Hannes Reinecke <hare@...e.de>
Cc:     Christoph Hellwig <hch@....de>, Mike Snitzer <snitzer@...hat.com>,
        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: [PATCH] nvme: allow ANA support to be independent of native
 multipathing

On Fri, Nov 16, 2018 at 11:06:32AM +0100, Hannes Reinecke wrote:
> Ok, so would you be happy with making ANA support configurable?

I've looked a bit over the whole situation, and what I think we need
to do is:

 a) warn if we see a ANA capable device without multipath support
    so people know it is not going to work properly.
 b) deprecate the multipath module option.  It was only intended as
    a migration for any pre-existing PCIe multipath user if there
    were any, not to support any new functionality.  So for 4.20
    put in a patch that prints a clear warning when it is used,
    including a link to the nvme list, and then for 4.25 or so
    remove it entirely unless something unexpected come up.

This whole drama of optional multipath use has wasted way too much
of everyones time already.