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Thu, 11 Feb 2021 09:58:09 +0000 From: Johannes Thumshirn To: "dsterba@suse.cz" , Naohiro Aota CC: "linux-btrfs@vger.kernel.org" , "dsterba@suse.com" , "hare@suse.com" , "linux-fsdevel@vger.kernel.org" Subject: Re: [PATCH v15 00/42] btrfs: zoned block device support Thread-Topic: [PATCH v15 00/42] btrfs: zoned block device support Thread-Index: AQHW+uBDi/qAxtbkv0uUNvQXEiNsGQ== Date: Thu, 11 Feb 2021 09:58:09 +0000 Message-ID: References: <20210210195829.GW1993@twin.jikos.cz> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: suse.cz; dkim=none (message not signed) header.d=none;suse.cz; dmarc=none action=none header.from=wdc.com; x-originating-ip: [129.253.240.72] x-ms-publictraffictype: Email x-ms-office365-filtering-ht: Tenant x-ms-office365-filtering-correlation-id: 02cfc2c9-5303-4c03-bed8-08d8ce73899a x-ms-traffictypediagnostic: SN6PR04MB4400: x-ms-exchange-transport-forked: True x-microsoft-antispam-prvs: wdcipoutbound: EOP-TRUE x-ms-oob-tlc-oobclassifiers: OLM:8882; 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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: SN4PR0401MB3598.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: 02cfc2c9-5303-4c03-bed8-08d8ce73899a X-MS-Exchange-CrossTenant-originalarrivaltime: 11 Feb 2021 09:58:09.7146 (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: rYyaYolOkhccfm6YA9QXyRFrudXs7wGkjP3IEKYU6UsPYDRu9r5yUwLsfwGC6+QatfY1uuRBNpE8B0WIUKGTI9lBN0rvzHuiNmlJe6BoHT8= X-MS-Exchange-Transport-CrossTenantHeadersStamped: SN6PR04MB4400 Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org On 10/02/2021 21:02, David Sterba wrote:=0A= >> This series implements superblock log writing. It uses two zones as a=0A= >> circular buffer to write updated superblocks. Once the first zone is fil= led=0A= >> up, start writing into the second zone. The first zone will be reset onc= e=0A= >> both zones are filled. We can determine the postion of the latest=0A= >> superblock by reading the write pointer information from a device.=0A= > =0A= > About that, in this patchset it's still leaving superblock at the fixed= =0A= > zone number while we want it at a fixed location, spanning 2 zones=0A= > regardless of their size.=0A= > =0A= =0A= We'll always need 2 zones or otherwise we won't be powercut safe.=0A=