linux-kernel - Re: [dm-devel] LVM snapshot broke between 4.14 and 4.16

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Message-ID: <20180803212638.GC31444@agk-dp.fab.redhat.com>
Date:   Fri, 3 Aug 2018 22:26:38 +0100
From:   Alasdair G Kergon <agk@...hat.com>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Theodore Ts'o <tytso@....edu>, Mike Snitzer <snitzer@...hat.com>,
        Jens Axboe <axboe@...nel.dk>, Sagi Grimberg <sagi@...mberg.me>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-block <linux-block@...r.kernel.org>, dm-devel@...hat.com,
        Ilya Dryomov <idryomov@...il.com>, wgh@...lan.ru,
        Zdenek Kabelac <zkabelac@...hat.com>
Subject: Re: [dm-devel] LVM snapshot broke between 4.14 and 4.16

On Fri, Aug 03, 2018 at 01:42:52PM -0700, Linus Torvalds wrote:
> So even in case 2, we do try to avoid versioning. More often we add a
> new flag, and say "hey, if you want the new behavior, use the new flag
> to say so". Not versioning, but explicit "I want the new behavior"
 
There are spare flags available in dm-ioctl - one could indeed turn on 
the new more-restrictive behaviour.

Alasdair