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Mon, 5 Oct 2026 11:14:30 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id o109OJWGw2rEVwAAD6G6ig (envelope-from ); Mon, 05 Oct 2026 11:14:30 +0000 Message-ID: Date: Mon, 5 Oct 2026 13:14:29 +0200 Precedence: bulk X-Mailing-List: linux-block@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 4/7] zloop: add storage element emulation To: Damien Le Moal , Jens Axboe , linux-block@vger.kernel.org, Christoph Hellwig , linux-scsi@vger.kernel.org, "Martin K . Petersen" References: <20261005094632.580753-1-dlemoal@kernel.org> <20261005094632.580753-5-dlemoal@kernel.org> Content-Language: en-US From: Hannes Reinecke In-Reply-To: <20261005094632.580753-5-dlemoal@kernel.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)[-0.979]; MIME_GOOD(-0.10)[text/plain]; RCVD_VIA_SMTP_AUTH(0.00)[]; MIME_TRACE(0.00)[0:+]; ARC_NA(0.00)[]; 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_HAS_DN(0.00)[]; RCPT_COUNT_FIVE(0.00)[6]; FROM_EQ_ENVFROM(0.00)[]; TO_MATCH_ENVRCPT_ALL(0.00)[]; RCVD_COUNT_TWO(0.00)[2]; DBL_BLOCKED_OPENRESOLVER(0.00)[suse.de:email,suse.de:mid,imap1.dmz-prg2.suse.org:helo] X-Spam-Flag: NO X-Spam-Score: -4.30 X-Spam-Level: On 10/5/26 11:46 AM, Damien Le Moal wrote: > Emulate the storage element depopulation feature of SMR disks in the > zloop driver. This emulation is controlled using the new stor_elements > option. > > This option can take several values: > - ZLOOP_STOR_ELEMENTS_NONE (0): no emulation (default) > - ZLOOP_STOR_ELEMENTS_RDWR (1): emulate all access storage elements > (e.g. read+write heads) > - ZLOOP_STOR_ELEMENTS_PAIRS (2): emulate fractional access storage > elements (e.g. pairs of read and write heads) > > If enabled with the value 1 or 2, the number of storage elements, or of > pairs of fractional access storage elements, is automatically calculated > based on the number of zones of the device so that we have at least 2 and > at most 32 storage elements (or 2 pairs of fractional access storage > elements). > > The mapping of zones to storage elements is defined simply as the modulo > of a zone number and a storage element ID. E.g, removing a storage > element from a set of 4 storage elements will offline 1 zone every 4 > zones. > > The storage element management operations are specified with the > zloop_se_ops (struct blk_storage_elements_ops). > > Signed-off-by: Damien Le Moal > --- > .../admin-guide/blockdev/zoned_loop.rst | 8 +- > drivers/block/zloop.c | 510 +++++++++++++++++- > 2 files changed, 490 insertions(+), 28 deletions(-) > Reviewed-by: Hannes Reinecke 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