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Mon, 02 Feb 2026 23:10:08 +0000 Message-ID: <2257486e-a52d-4b11-bf09-e2adedf2decb@suse.de> Date: Tue, 3 Feb 2026 00:10:05 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [LSF/MM?BFP TOPIC] Block-layer device resets To: Bart Van Assche , lsf-pc , "linux-block@vger.kernel.org" , "linux-nvme@lists.infradead.org" References: <50ee77fa-0c44-422e-9ee2-eece60b189e1@suse.de> <923b3b4d-a84e-4a19-8767-6bca59204ff1@acm.org> Content-Language: en-US From: Hannes Reinecke In-Reply-To: <923b3b4d-a84e-4a19-8767-6bca59204ff1@acm.org> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Spamd-Result: default: False [-4.30 / 50.00]; BAYES_HAM(-3.00)[100.00%]; NEURAL_HAM_LONG(-1.00)[-1.000]; NEURAL_HAM_SHORT(-0.20)[-1.000]; MIME_GOOD(-0.10)[text/plain]; RCVD_VIA_SMTP_AUTH(0.00)[]; ARC_NA(0.00)[]; TO_DN_EQ_ADDR_SOME(0.00)[]; MIME_TRACE(0.00)[0:+]; FUZZY_RATELIMITED(0.00)[rspamd.com]; TO_DN_SOME(0.00)[]; MID_RHS_MATCH_FROM(0.00)[]; RCVD_TLS_ALL(0.00)[]; DKIM_SIGNED(0.00)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519]; FROM_EQ_ENVFROM(0.00)[]; FROM_HAS_DN(0.00)[]; RCPT_COUNT_THREE(0.00)[4]; RCVD_COUNT_TWO(0.00)[2]; TO_MATCH_ENVRCPT_ALL(0.00)[]; DBL_BLOCKED_OPENRESOLVER(0.00)[imap1.dmz-prg2.suse.org:helo,suse.de:mid,suse.de:email]; SUBJECT_HAS_QUESTION(0.00)[] X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260202_151012_610569_36ED9EC8 X-CRM114-Status: GOOD ( 12.49 ) X-BeenThere: linux-nvme@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "Linux-nvme" Errors-To: linux-nvme-bounces+linux-nvme=archiver.kernel.org@lists.infradead.org On 2/2/26 18:27, Bart Van Assche wrote: > On 2/1/26 9:06 AM, Hannes Reinecke wrote: >> While we could easily terminate the controller, the specification >> also requires us to terminate all outstanding commands. > What specification is the above referring to? > > Regarding terminating outstanding commands, doesn't how to do this > depend on the storage protocol? Isn't the recommended procedure for > NVMe to delete and re-create all I/O submission and completion queues? > This procedure doesn't require support in the block layer for aborting > individual commands. > Sure, all drivers/subsystems implement a similar mechanism. But this is pretty much implementation specific, and typically wrapped into the device teardown path. But that typically also involves tearing down and re-creating the device node which doesn't lend itself for some configurations. This proposal is to ensure that all I/O is flushed from the device without having to reconfigure anything; typical use-case would be when this device is used as a backing device for a nvmet namespace. Cheers, Hannes -- Dr. Hannes Reinecke Kernel Storage Architect hare@suse.de +49 911 74053 688 SUSE Software Solutions GmbH, Frankenstr. 146, 90461 Nürnberg HRB 36809 (AG Nürnberg), GF: I. Totev, A. McDonald, W. Knoblich