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envelope-from=k.jensen@samsung.com; helo=mailout1.w1.samsung.com X-Spam_score_int: -70 X-Spam_score: -7.1 X-Spam_bar: ------- X-Spam_report: (-7.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_HI=-5, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org On Aug 23 22:58, Sam Li wrote: > Stefan Hajnoczi 于2023年8月23日周三 22:41写道： > > > > On Wed, 23 Aug 2023 at 10:24, Sam Li wrote: > > > > > > Hi Stefan, > > > > > > Stefan Hajnoczi 于2023年8月23日周三 21:26写道： > > > > > > > > Hi Sam and Klaus, > > > > Val is adding nvme-io_uring ZNS support to libblkio > > > > (https://gitlab.com/libblkio/libblkio/-/merge_requests/221) and asked > > > > how to test the size of the last zone when the namespace's total size > > > > is not a multiple of the zone size. > > > > > > I think a zone report operation can do the trick. Given zone configs, > > > the size of last zone should be [size - (nr_zones - 1) * zone_size]. > > > Reporting last zone on such devices tells whether the value is > > > correct. > > > > In nvme_ns_zoned_check_calc_geometry() the number of zones is rounded down: > > > > ns->num_zones = le64_to_cpu(ns->id_ns.nsze) / ns->zone_size; > > > > Afterwards nsze is recalculated as follows: > > > > ns->id_ns.nsze = cpu_to_le64(ns->num_zones * ns->zone_size); > > > > I interpret this to mean that when the namespace's total size is not a > > multiple of the zone size, then the last part will be ignored and not > > exposed as a zone. > > I see. Current ZNS emulation does not support this case. > NVMe Zoned Namespaces requires all zones to be the same size. The "trailing zone" is a thing in SMR HDDs. Cheers, Klaus