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Message-ID: <20220830025235.vesnxh6xw6j2vvsu@shindev> Date: Tue, 30 Aug 2022 02:52:37 +0000 From: Shinichiro Kawasaki <shinichiro.kawasaki@....com> To: Pankaj Raghav <p.raghav@...sung.com> CC: "agk@...hat.com" <agk@...hat.com>, "snitzer@...nel.org" <snitzer@...nel.org>, "axboe@...nel.dk" <axboe@...nel.dk>, "damien.lemoal@...nsource.wdc.com" <damien.lemoal@...nsource.wdc.com>, "hch@....de" <hch@....de>, "pankydev8@...il.com" <pankydev8@...il.com>, Johannes Thumshirn <Johannes.Thumshirn@....com>, "linux-block@...r.kernel.org" <linux-block@...r.kernel.org>, "dm-devel@...hat.com" <dm-devel@...hat.com>, "hare@...e.de" <hare@...e.de>, "jaegeuk@...nel.org" <jaegeuk@...nel.org>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, Matias Bjørling <Matias.Bjorling@....com>, "gost.dev@...sung.com" <gost.dev@...sung.com>, "bvanassche@....org" <bvanassche@....org>, "linux-nvme@...ts.infradead.org" <linux-nvme@...ts.infradead.org>, Damien Le Moal <Damien.LeMoal@....com> Subject: Re: [PATCH v12 13/13] dm: add power-of-2 target for zoned devices with non power-of-2 zone sizes On Aug 23, 2022 / 14:18, Pankaj Raghav wrote: > Only zoned devices with power-of-2(po2) number of sectors per zone(zone > size) were supported in linux but now non power-of-2(npo2) zone sizes > support has been added to the block layer. > > Filesystems such as F2FS and btrfs have support for zoned devices with > po2 zone size assumption. Before adding native support for npo2 zone > sizes, it was suggested to create a dm target for npo2 zone size device to > appear as a po2 zone size target so that file systems can initially > work without any explicit changes by using this target. FYI, with this patch series, I created the new dm target and ran blktests zbd group for it. And I observed zbd/007 test case failure (other test cases passed). The test checks sector mapping of zoned dm-linear, dm-flakey and dm- crypt. Some changes in the test case look required to handle the new target. -- Shin'ichiro Kawasaki
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