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Mon, 15 Jan 2024 17:56:17 +0000 (UTC) Received: from dovecot-director2.suse.de ([10.150.64.162]) by imap1.dmz-prg2.suse.org with ESMTPSA id Ft4jD8FxpWWuMgAAD6G6ig (envelope-from ); Mon, 15 Jan 2024 17:56:17 +0000 Message-ID: Subject: Re: [dm-devel] [PATCH v2 0/4] Diskseq support in device-mapper From: Martin Wilck To: Demi Marie Obenour , Alasdair Kergon , Mike Snitzer , dm-devel@lists.linux.dev, Christoph Hellwig Cc: linux-kernel@vger.kernel.org, linux-block@vger.kernel.org, Franck Bui Date: Mon, 15 Jan 2024 18:56:16 +0100 In-Reply-To: <20230624230950.2272-1-demi@invisiblethingslab.com> References: <20230624230950.2272-1-demi@invisiblethingslab.com> Autocrypt: addr=mwilck@suse.com; prefer-encrypt=mutual; keydata=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 FWjq3LA0t2FLEVXdF/NcVw1Qn6kIIfbgPYVdBMO1b3ciu+NY6ba8lzqiIIH+Js/+JnAwzLQNLp360Kza7/P7bgd0NxBCbLziay7MVZawRQhCUkUWcqeonGBuSyf0wO3sFlRZm+pv1sg6I6DZCrykSFyABkH7joZg5nUuNuT3/E2Jw9gBqll6OrsgTDzWzofTASYtQIRjqLypeqiz4ADmHy9tyEt1SxVd2C4o1JmY= Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.50.3 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Authentication-Results: smtp-out2.suse.de; none X-Spamd-Result: default: False [-0.10 / 50.00]; ARC_NA(0.00)[]; RCVD_VIA_SMTP_AUTH(0.00)[]; BAYES_HAM(-0.00)[12.40%]; FROM_HAS_DN(0.00)[]; TO_DN_SOME(0.00)[]; TO_MATCH_ENVRCPT_ALL(0.00)[]; MIME_GOOD(-0.10)[text/plain]; RCVD_COUNT_THREE(0.00)[3]; DKIM_SIGNED(0.00)[suse.com:s=susede1]; RCPT_COUNT_SEVEN(0.00)[8]; FUZZY_BLOCKED(0.00)[rspamd.com]; FROM_EQ_ENVFROM(0.00)[]; MIME_TRACE(0.00)[0:+]; RCVD_TLS_ALL(0.00)[]; MID_RHS_MATCH_FROM(0.00)[] X-Spam-Level: X-Spam-Flag: NO X-Spam-Score: -0.10 On Sat, 2023-06-24 at 19:09 -0400, Demi Marie Obenour wrote: > This work aims to allow userspace to create and destroy device-mapper > devices in a race-free way. The discussion about this feature seems to have stalled ... will there be a v3 of this series any time soon? Also, I am wondering what should happen if a device-mapper table is changed in a SUSPEND/LOAD/RESUME cycle. Such operations can change the content of the device, thus I assume that the diskseq should also change. But AFAICS this wasn't part of your patch set. In general, whether the content changes in a reload operation depends on the target. The multipath target, for example, reloads frequently without changing the content of the dm device. An ever-changing diskseq wouldn't make a lot of sense for dm-multipath. But I doubt we want to start making distinctions on this level, so I guess that diskseq and multipath just won't go well together. Regards, Martin=20