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Petersen" , "linux-fsdevel@vger.kernel.org" , Johannes Thumshirn , Shinichiro Kawasaki Subject: Re: [PATCH v2 3/3] zonefs: fix synchronous write to sequential zone files Thread-Topic: [PATCH v2 3/3] zonefs: fix synchronous write to sequential zone files Thread-Index: AQHXMzIUD8ZVvai2c0OhPeRaKpo++w== Date: Mon, 19 Apr 2021 07:08:46 +0000 Message-ID: References: <20210417023323.852530-1-damien.lemoal@wdc.com> <20210417023323.852530-4-damien.lemoal@wdc.com> <20210419064529.GA19041@lst.de> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: lst.de; dkim=none (message not signed) header.d=none;lst.de; dmarc=none action=none header.from=wdc.com; x-originating-ip: [2400:2411:43c0:6000:a0c9:53b3:13f2:51e7] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: f86fe9a9-8d30-4847-382a-08d90301f9b2 x-ms-traffictypediagnostic: MN2PR04MB6976: x-ms-exchange-transport-forked: True x-microsoft-antispam-prvs: wdcipoutbound: EOP-TRUE x-ms-oob-tlc-oobclassifiers: OLM:8273; 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charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: wdc.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: BL0PR04MB6514.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: f86fe9a9-8d30-4847-382a-08d90301f9b2 X-MS-Exchange-CrossTenant-originalarrivaltime: 19 Apr 2021 07:08:46.6492 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: b61c8803-16f3-4c35-9b17-6f65f441df86 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: ZxOqbGjYdWlED7Z3fluNIboWDAovZsMaVBEbORsesaYcZw9kItpBUTsjUjlva+A40t9vitWdEcRlMM/1y8tK9w== X-MS-Exchange-Transport-CrossTenantHeadersStamped: MN2PR04MB6976 Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org On 2021/04/19 15:45, Christoph Hellwig wrote:=0A= > On Sat, Apr 17, 2021 at 11:33:23AM +0900, Damien Le Moal wrote:=0A= >> Synchronous writes to sequential zone files cannot use zone append=0A= >> operations if the underlying zoned device queue limit=0A= >> max_zone_append_sectors is 0, indicating that the device does not=0A= >> support this operation. In this case, fall back to using regular write= =0A= >> operations.=0A= > =0A= > Zone append is a mandatory feature of the zoned device API.=0A= =0A= Yes, I am well aware of that. All physical zoned devices and null blk do su= pport=0A= zone append, but the logical device created by dm-crypt is out. And we cann= ot=0A= simply disable zone support in dm-crypt as there are use cases out there in= the=0A= field that I am aware of, in SMR space.=0A= =0A= So this series is a compromise: preserve dm-crypt zone support for SMR (no = one=0A= uses the zone append emulation yet, as far as I know) by disabling zone app= end.=0A= =0A= For zonefs, we can:=0A= 1) refuse to mount if ZA is disabled, same as btrfs=0A= 2) Do as I did in the patch, fallback to regular writes since that is easy = to do=0A= (zonefs file size tracks the WP position already).=0A= =0A= I chose option (2) to allow for SMR+dm-crypt to still work with zonefs.=0A= =0A= =0A= -- =0A= Damien Le Moal=0A= Western Digital Research=0A=