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Petersen" , "linux-fsdevel @ vger . kernel . org" , "Darrick J . Wong" Subject: Re: [PATCH v2 10/11] iomap: Add support for zone append writes Thread-Topic: [PATCH v2 10/11] iomap: Add support for zone append writes Thread-Index: AQHWAfBwrmUQROWSvUa2jUG+SCcnLQ== Date: Wed, 25 Mar 2020 09:54:12 +0000 Message-ID: References: <20200324152454.4954-1-johannes.thumshirn@wdc.com> <20200324152454.4954-11-johannes.thumshirn@wdc.com> <20200324154131.GA32087@infradead.org> <20200325094828.GA20415@infradead.org> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: spf=none (sender IP is ) smtp.mailfrom=Johannes.Thumshirn@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: a3249c4f-f3dc-47f8-78ef-08d7d0a2790d x-ms-traffictypediagnostic: SN4PR0401MB3613: x-ld-processed: b61c8803-16f3-4c35-9b17-6f65f441df86,ExtAddr x-ms-exchange-transport-forked: True x-microsoft-antispam-prvs: wdcipoutbound: EOP-TRUE x-ms-oob-tlc-oobclassifiers: OLM:7219; x-forefront-prvs: 0353563E2B x-forefront-antispam-report: SFV:NSPM;SFS:(10019020)(4636009)(376002)(396003)(136003)(39860400002)(366004)(346002)(81156014)(91956017)(86362001)(52536014)(76116006)(4744005)(478600001)(2906002)(8676002)(81166006)(8936002)(66476007)(4326008)(7696005)(6916009)(71200400001)(5660300002)(26005)(53546011)(186003)(55016002)(9686003)(54906003)(66556008)(316002)(33656002)(6506007)(66446008)(66946007)(64756008);DIR:OUT;SFP:1102;SCL:1;SRVR:SN4PR0401MB3613;H:SN4PR0401MB3598.namprd04.prod.outlook.com;FPR:;SPF:None;LANG:en;PTR:InfoNoRecords; x-ms-exchange-senderadcheck: 1 x-microsoft-antispam: BCL:0; x-microsoft-antispam-message-info: 1ACfLe7S1M8BjPmXTL65Hy0zaZ3mdMN4IiJAF9k5tslz1SAQcTyj8w8esfxAFXggFJUbtTaNv6UY4PpuNf3QfTtH34aSn7sWek9CGh7udySFYUGKmr9hrCqu7v0m2zFwqinUBduHwIRiUUYpeU3leI+oATMCvsOIMbgBt4mAKhGfaMGsWzHfLH3cNSgq3fnGStx5rsVOMbPxBhiV4HNem2fe9NmqJtQgijDRZjERP0UZY5GmBYdRq9oG0rJDrC2jCCeK44wg8+SnKcoCXym+3Fvpx+vQYoM090oMmJasxwZx2V911XjYxRoaIAEf7utOwzMwQHlDAmiRqI3BDVBB/XC0GVOvmrg3U5+h5t05yAGHochQWCUsPycTupchtcf/ZpQy7Q/cANo36Cf6axBUMpmzlxJw39RfGtggb2IySIY7PvAhI09MN5XTi4T4yjtf x-ms-exchange-antispam-messagedata: t08/6RI94Ot7RXbqA5L1lEy9s6R5/SwRNzYAzwgQjY3HByhY4WRfVeO1hBb7plUwI+xIbwM19BX5m5jF9aGvX977rLYy9S724nAicYwT19DKnavWNzEITFCbvMfkZmKiUGxbMmNp1RnvkMbOPMTugg== Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: wdc.com X-MS-Exchange-CrossTenant-Network-Message-Id: a3249c4f-f3dc-47f8-78ef-08d7d0a2790d X-MS-Exchange-CrossTenant-originalarrivaltime: 25 Mar 2020 09:54:12.4893 (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: V9Gdm2GZULV5IMzDZIDlrcJHx+A0tePhERHHnlULh6c+mE336EsE4g+lPxORFAH9rzEDLwoVo4eiMxARhc2UwH9c/EcGafO+rzBo6yAJ9xI= X-MS-Exchange-Transport-CrossTenantHeadersStamped: SN4PR0401MB3613 Sender: linux-block-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org On 25/03/2020 10:48, hch@infradead.org wrote:=0A= > On Wed, Mar 25, 2020 at 09:45:39AM +0000, Johannes Thumshirn wrote:=0A= >>=0A= >> Can you please elaborate on that? Why doesn't this hold true for a=0A= >> normal file system? If we split the DIO write into multiple BIOs with=0A= >> zone-append, there is nothing which guarantees the order of the written= =0A= >> data (at least as far as I can see).=0A= > =0A= > Of course nothing gurantees the order. But the whole point is that the= =0A= > order does not matter.=0A= > =0A= =0A= Ok now I'm totally lost. The order of data inside an extent does matter, = =0A= otherwise we have data corruption.=0A=