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Tue, 15 Sep 2020 10:12:58 +0000 From: Johannes Thumshirn To: Qu Wenruo , Qu Wenruo , "linux-btrfs@vger.kernel.org" Subject: Re: [PATCH v2 07/19] btrfs: update num_extent_pages() to support subpage sized extent buffer Thread-Topic: [PATCH v2 07/19] btrfs: update num_extent_pages() to support subpage sized extent buffer Thread-Index: AQHWiyIdMcWiFckg70uvUuaCRMWL1g== Date: Tue, 15 Sep 2020 10:12:58 +0000 Message-ID: References: <20200915053532.63279-1-wqu@suse.com> <20200915053532.63279-8-wqu@suse.com> <56c0c885-fb75-36d3-00de-202ea53b1b0b@gmx.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: gmx.com; dkim=none (message not signed) header.d=none;gmx.com; dmarc=none action=none header.from=wdc.com; x-originating-ip: [2001:a62:1460:3d01:38cf:f1ce:e1ec:d261] x-ms-publictraffictype: Email x-ms-office365-filtering-ht: Tenant x-ms-office365-filtering-correlation-id: a017c637-900c-42e1-24b7-08d8595febef x-ms-traffictypediagnostic: SN6PR04MB4045: x-microsoft-antispam-prvs: wdcipoutbound: EOP-TRUE x-ms-oob-tlc-oobclassifiers: OLM:6108; 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charset="iso-2022-jp" 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: a017c637-900c-42e1-24b7-08d8595febef X-MS-Exchange-CrossTenant-originalarrivaltime: 15 Sep 2020 10:12:58.6359 (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: 4McZK350DJ/v1MFB15keeh5wNTwvckF4sj/se4kifHgAJ07gZ9ruvzm1vNub6X+zp+Vkeva2Jf49r7KDHJKz/rybqhFzTNC4+KhOx6nooVI= X-MS-Exchange-Transport-CrossTenantHeadersStamped: SN6PR04MB4045 Sender: linux-btrfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org On 15/09/2020 12:07, Qu Wenruo wrote:=0A= > =0A= > =0A= > On 2020/9/15 =1B$B2<8a=1B(B4:42, Johannes Thumshirn wrote:=0A= >> On 15/09/2020 07:36, Qu Wenruo wrote:=0A= >>> + * For sectorsize < PAGE_SIZE case, we only want to support 64K=0A= >>> + * PAGE_SIZE, and ensured all tree blocks won't cross page boundary.= =0A= >>> + * So in that case we always got 1 page.=0A= >>=0A= >> Just to clarify, does this mean we won't support 512B sector size with 4= K pages?=0A= >>=0A= > At least that's why I have planned.=0A= > =0A= > I think the current minimal 4K sector size is pretty reasonable.=0A= =0A= OK thanks =0A=